US5015540A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fiber-containing composite
Assignee: General Electric Co
•
Filing: 1987-06-01
•
Granted: 1991-05-14
•
Expires: 2007-06-01
Abstract
Abstract Fibrous material is coated with boron nitride and a silicon-wettable material, the coated fibrous material is admixed with an infiltration-promoting material which is at least partly elemental carbon and the mixture is formed into a preform which is infiltrated with molten silicon producing a composite containing boron nitride coated fibrous material.
Inventors
- 👤 Marcus P. Borom
- 👤 William B. Hillig
- 👤 Raj N. Singh
- 👤 William A. Morrison
- 👤 Leonard V. Interrante
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:48
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/573; C04B35/622; C04B35/626; C04B35/62605; C04B35/6269; C04B35/628; C04B35/62844; C04B35/62857; C04B35/62865; C04B35/62868; C04B35/62873; C04B35/62884; C04B35/62894; C04B35/62897; C04B35/63; C04B35/6303; C04B35/6316; C04B35/632; C04B35/634; C04B35/63448; C04B35/63452; C04B35/71; C04B35/78; C04B35/80; C04B41/45; C04B41/4584; C04B41/52; C04B41/80; C04B41/81; C04B41/89; D; D01; D01F; D01F11/00; D01F11/10; D01F11/12; D01F11/124; D01F11/126; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/3891; C04B2235/42; C04B2235/421; C04B2235/422; C04B2235/425; C04B2235/428; C04B2235/48; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/5252; C04B2235/5256; C04B2235/526; C04B2235/5264; C04B2235/60; C04B2235/608; C04B2235/65; C04B2235/658; C04B2235/6581; C04B2235/70; C04B2235/74; C04B2235/77; C04B2235/80; C04B2235/94; C04B2235/96; Y; Y10; Y10S; Y10S428/00; Y10S428/902; Y10T; Y10T428/00; Y10T428/12; Y10T428/12486; Y10T428/25; Y10T428/252; Y10T428/29; Y10T428/2904; Y10T428/2907; Y10T428/2913; Y10T428/2916; Y10T428/2918; Y10T428/2933; Y10T428/2938; Y10T428/30
Claims Analysis
Total Claims: 61
Claim 1
Independent Claim
357 words
A process for producing a composite with a porosity of less than about 20% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a Si-C containing material containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof; (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) admixing an infiltration-promoting material containing elemental carbon with the resulting coated fibrous material producing a mixture wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture; (d) forming said mixture into a preform having an open porosity ranging from about 25% by volume to about 90% by volume of the preform; (e) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform; (f) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (g) cooling said product to produce said composite.
Claim 2
Dependent Claim
357 words
A process for producing a composite with a porosity of less than about 20% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a Si-C containing material containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof; (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) admixing an infiltration-promoting material containing elemental carbon with the resulting coated fibrous material producing a mixture wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture; (d) forming said mixture into a preform having an open porosity ranging from about 25% by volume to about 90% by volume of the preform; (e) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform; (f) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (g) cooling said product to produce said composite.
Claim 3
Dependent Claim
39 words
The process according to claim 1 wherein said silicon-wettable material is selected from the group consisting of elemental carbon, metal carbide, a metal which reacts with silicon to form a silicide thereof, a metal nitride and a metal silicide.
Claim 4
Dependent Claim
24 words
The process according to claim 1 wherein said preform has an open porosity ranging from about 35% by volume to about 80% by volume.
Claim 5
Dependent Claim
15 words
The process according to claim 1 wherein said infiltration-promoting material is comprised of elemental carbon.
Claim 6
Dependent Claim
16 words
The process according to claim 1, wherein said fibrous material component is comprised of elemental carbon.
Claim 7
Dependent Claim
16 words
The process according to claim 1, wherein said fibrous material component is comprised of silicon carbide.
Claim 8
Dependent Claim
23 words
The process according to claim 1 wherein said matrix phase is comprised of said silicon carbide formed in situ and said elemental silicon.
Claim 9
Dependent Claim
29 words
The process according to claim 1 wherein said fibrous component of said coated fibrous material comprises from about 10% by volume to about 70% by volume of said composite.
Claim 10
Dependent Claim
155 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being selected from the group consisting of elemental carbon, a SiC-containing material containing by weight of the SiC-containing material of least about 50% by weight of silicon and at least about 25% by weight of carbon, and a combination thereof, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 11
Dependent Claim
155 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being selected from the group consisting of elemental carbon, a SiC-containing material containing by weight of the SiC-containing material of least about 50% by weight of silicon and at least about 25% by weight of carbon, and a combination thereof, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 12
Dependent Claim
25 words
The composite according to claim 9 wherein said silicon carbide phase ranges from about 15% by volume to about 79% by volume of the composite.
Claim 13
Dependent Claim
16 words
The composite according to claim 9 wherein said fibrous material component is comprised of elemental carbon.
Claim 14
Dependent Claim
16 words
The composite according to claim 9, wherein said fibrous material component is comprised of silicon carbide.
Claim 15
Dependent Claim
22 words
The composite according to claim 9 wherein said matrix phase is comprised of said silicon carbide phase and said elemental silicon phase.
Claim 16
Dependent Claim
25 words
The composite according to claim 9 wherein said fibrous material component ranges from about 10% by volume to about 70% by volume of said composite.
Claim 17
Dependent Claim
16 words
The composite according to claim 9 having a porosity of less than about 10% by volume.
Claim 18
Dependent Claim
18 words
The composite according to claim 9 wherein said fibrous material component is in the form of continuous filaments.
Claim 19
Dependent Claim
175 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said boron nitride-coated material being present in an amount ranging from about 10% by volume to about 70% by volume of the composite and being selected from the group consisting of elemental carbon, a SiC-containing material containing by weight of the SiC-containing material at least about 50% by weight of silicon and at least about 25% by weight of carbon, and a combination thereof, said boron nitride coating being at least detectable by scanning electron microscopy, said coated fibrous material being distributed through said composite, said matrix phase being comprised of silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 10% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said matrix phase totally enveloping said boron nitride-coated fibrous material, said composite having a porosity of less than about 20% by volume.
Claim 20
Dependent Claim
175 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said boron nitride-coated material being present in an amount ranging from about 10% by volume to about 70% by volume of the composite and being selected from the group consisting of elemental carbon, a SiC-containing material containing by weight of the SiC-containing material at least about 50% by weight of silicon and at least about 25% by weight of carbon, and a combination thereof, said boron nitride coating being at least detectable by scanning electron microscopy, said coated fibrous material being distributed through said composite, said matrix phase being comprised of silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 10% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said matrix phase totally enveloping said boron nitride-coated fibrous material, said composite having a porosity of less than about 20% by volume.
Claim 21
Dependent Claim
25 words
The composite according to claim 17 wherein said silicon carbide phase ranges from about 10% by volume to about 70% by volume of said composite.
Claim 22
Dependent Claim
27 words
The composite according to claim 17 wherein said fibrous material component ranges from about 15% by volume to less than about 65% by volume of said composite.
Claim 23
Dependent Claim
16 words
The composite according to claim 17 wherein said fibrous material component is comprised of elemental carbon.
Claim 24
Dependent Claim
16 words
The composite according to claim 17 wherein said fibrous material component is comprised of silicon carbide.
Claim 25
Dependent Claim
16 words
The composite according to claim 17 wherein said fibrous material component is comprised of continuous filaments.
Claim 26
Dependent Claim
355 words
A process for producing a composite with a porosity of less than about 5% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a substance containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof, (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) admixing an infiltration-promoting material containing elemental carbon with the resulting coated fibrous material producing a mixture wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture; (d) forming said mixture into a preform having an open porosity ranging from about 35% by volume to about 80% by volume of the preform; (e) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform, (f) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (g) cooling said product to produce said composite.
Claim 27
Dependent Claim
355 words
A process for producing a composite with a porosity of less than about 5% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a substance containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof, (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) admixing an infiltration-promoting material containing elemental carbon with the resulting coated fibrous material producing a mixture wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture; (d) forming said mixture into a preform having an open porosity ranging from about 35% by volume to about 80% by volume of the preform; (e) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform, (f) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (g) cooling said product to produce said composite.
Claim 28
Dependent Claim
39 words
The process according to claim 23 wherein said silicon-wettable material is selected from the group consisting of elemental carbon, metal carbide, a metal which reacts with silicon to form a silicide thereof, a metal nitride and a metal silicide.
Claim 29
Dependent Claim
19 words
The process according to claim 23 wherein said composite has a porosity of less than about 1% by volume.
Claim 30
Dependent Claim
25 words
The process according to claim 23 wherein said elemental carbon ranges from about 10% by volume to about 100% by volume of the infiltration-promoting material.
Claim 31
Dependent Claim
15 words
The process according to claim 23 wherein said fibrous material is comprised of elemental carbon.
Claim 32
Dependent Claim
15 words
The process according to claim 23 wherein said fibrous material is comprised of silicon carbide.
Claim 33
Dependent Claim
21 words
The process according to claim 1 wherein said fibrous material is comprised of a combination of silicon carbide and elemental carbon.
Claim 34
Dependent Claim
23 words
The process according to claim 1 wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core.
Claim 35
Dependent Claim
29 words
The process according to claim 1, wherein said infiltration-promoting material in step (c) contains molybdenum in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 36
Dependent Claim
23 words
The process according to claim 23, wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core.
Claim 37
Dependent Claim
29 words
The process according to claim 23, wherein said infiltration-promoting material in step (c) contains molybdenum in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 38
Dependent Claim
25 words
The composite according to claim 9, wherein said fibrous material component is comprised of said SiC-containing material and said fibrous material component envelops a core.
Claim 39
Dependent Claim
23 words
The composite according to claim 9, wherein said matrix phase contains molybdenum silicide ranging up to about 50% by volume of the composite.
Claim 40
Dependent Claim
25 words
The composite according to claim 17, wherein said fibrous material component is comprised of said SiC-containing material and said fibrous material component envelops a core.
Claim 41
Dependent Claim
23 words
The composite according to claim 17, wherein said matrix phase contains molybdenum silicide ranging up to about 50% by volume of the composite.
Claim 42
Dependent Claim
120 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being comprised of silicon carbide, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 43
Dependent Claim
120 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being comprised of silicon carbide, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 44
Dependent Claim
120 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being comprised of elemental carbon, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 45
Dependent Claim
120 words
A composite comprised of boron nitride-coated fibrous material and a matrix phase containing silicon carbide phase and elemental silicon phase, said silicon carbide phase being present in an amount of at least about 5% by volume of said composite, said elemental silicon phase being present in an amount of at least about 1% by volume of said composite, said fibrous material component of said boron nitride-coated material being present in an amount of at least about 5% by volume of said composite, said fibrous material component of said coated fibrous material being comprised of elemental carbon, said boron nitride coating being at least detectable by scanning electron microscopy, said composite having a porosity of less than about 20% by volume.
Claim 46
Dependent Claim
356 words
A process for producing a composite with a porosity of less than about 20% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a SiC-containing material containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof; (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) forming a preform comprised of a mixture of the resulting coated fibrous material and an infiltration promoting material containing elemental carbon wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture, said preform having an open porosity ranging from about 25% by volume to about 90% by volume of the preform; (d) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform; (e) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (f) cooling said product to produce said composite.
Claim 47
Dependent Claim
356 words
A process for producing a composite with a porosity of less than about 20% by volume comprised of boron nitride-coated fibrous material and a matrix phase, said fibrous material component of said coated fibrous material comprising at least about 5% by volume of the composite, said matrix phase containing silicon carbide formed in situ in an amount of at least about 5% by volume of the composite and elemental silicon in an amount of at least about 1% by volume of the composite, which comprises the following steps: (a) depositing boron nitride on a fibrous material producing a coating thereon which leaves no significant portion of said fibrous material exposed, said fibrous material being selected from the group consisting of elemental carbon, a SiC-containing material containing at least about 50% by weight silicon and at least about 25% by weight carbon, and a combination thereof; (b) depositing a silicon-wettable material on said boron nitride-coated fibrous material producing a coating thereon which leaves no significant portion of said boron nitride exposed, said silicon-wettable material adhering to boron nitride sufficiently to form said coating thereon and being wetted by silicon sufficiently to produce said composite; (c) forming a preform comprised of a mixture of the resulting coated fibrous material and an infiltration promoting material containing elemental carbon wherein the fibrous material component of said coated fibrous material comprises at least about 5% by volume of said mixture, said preform having an open porosity ranging from about 25% by volume to about 90% by volume of the preform; (d) contacting said preform with silicon-associated infiltrating means whereby said silicon is infiltrated into said preform; (e) heating the resulting structure in a partial vacuum to a temperature at which said silicon is molten and infiltrating said molten silicon into said preform to produce an infiltrated product having the composition of said composite, said preform containing sufficient elemental carbon to react with said silicon to form said composite, said partial vacuum being at least sufficient to remove gas from said preform so as to allow said molten silicon to infiltrate said preform; and (f) cooling said product to produce said composite.
Claim 48
Dependent Claim
15 words
The process according to claim 40, wherein said infiltration-promoting material is comprised of elemental carbon.
Claim 49
Dependent Claim
16 words
The process according to claim 40, wherein said fibrous material component is comprised of elemental carbon.
Claim 50
Dependent Claim
16 words
The process according to claim 40, wherein said fibrous material component is comprised of silicon carbide.
Claim 51
Dependent Claim
23 words
The process according to claim 40, wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core.
Claim 52
Dependent Claim
29 words
The process according to claim 40, wherein said infiltration-promoting material in step (c) contains molybdenum in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 53
Dependent Claim
47 words
The process according to claim 40, wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core, and wherein said infiltration-promoting material in step (c) contains molybdenum in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 54
Dependent Claim
48 words
The process according to claim 40, wherein said fibrous material is comprised of said Si-C containing material and said fibrous material envelops a core, and wherein said infiltration-promoting material in step (c) contains molybdenum in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 55
Dependent Claim
30 words
The process according to claim 40, wherein said infiltration-promoting material in step (c) contains molybdenum carbide in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 56
Dependent Claim
30 words
The process according to claim 40, wherein said infiltration-promoting material in step (c) contains molybdenum carbide in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 57
Dependent Claim
48 words
The process according to claim 1, wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core, and wherein said infiltration-promoting material in step (c) contains molybdenum carbide in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 58
Dependent Claim
48 words
The process according to claim 40, wherein said fibrous material is comprised of said SiC-containing material and said fibrous material envelops a core, and wherein said infiltration-promoting material in step (c) contains molybdenum carbide in an amount of at least about 1% by volume of said infiltration-promoting material.
Claim 59
Dependent Claim
23 words
The composite according to claim 9, wherein said matrix phase contains molybdenum carbide ranging up to about 50% by volume of the composite.
Claim 60
Dependent Claim
43 words
The composite according to claim 9, wherein said fibrous material component is comprised of said SiC-containing material and said fibrous material component envelops a core, and wherein said matrix phase contains molybdenum carbide ranging up to about 50% by volume of the composite.
Claim 61
Dependent Claim
43 words
The composite according to claim 9, wherein said fibrous material component is comprised of said SiC-containing material and said fibrous material component envelops a core, and wherein said matrix phase contains molybdenum silicide ranging up to about 50% by volume of the composite.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-13 | 1994-11-12 | 1995-05-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-13 | 1998-11-12 | 1999-05-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-13 | 2002-11-12 | 2003-05-14 | $7700.00 | Window Closed / Lapsed |