US4636480A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Composite by infiltration
Assignee: General Electric Co
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Filing: 1985-07-29
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Granted: 1987-01-13
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Expires: 2005-07-29
Abstract
Abstract A composite is produced by forming a porous compact of a ceramic member selected from the group consisting of boron carbide, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, silicon carbide, silicon nitride, tantalum carbide, tantalum nitride, titanium carbide, titanium nitride, vanadium carbide, vanadium nitride, zirconium carbide and zirconium nitride, and infiltrating the compact with a member selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride, and a mixture of said fluoride with a metal oxide.
Inventors
- 👤 William B. Hillig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:09
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; C04B35/00; C04B35/515; C04B35/553; C04B35/56; C04B35/565; C04B35/71; C04B35/78; C04B35/80; C04B41/45; C04B41/50; C04B41/5018; C04B41/80; C04B41/81; C04B41/85
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
168 words
A polycrystalline composite comprised of a ceramic member in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 10% by volume of said composite, said ceramic member being selected from the group consisting of boron carbide, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, silicon carbide, tantalum carbide, tantalum nitride, titanium carbide, titanium nitride, vanadium carbide, vanadium nitride, zirconium carbide and zirconium nitride, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide wherein said mixture of said fluoride and metal oxide has a liquidus temperature ranging from above 1000° C. to below about 1500° C.
Claim 2
Dependent Claim
168 words
A polycrystalline composite comprised of a ceramic member in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 10% by volume of said composite, said ceramic member being selected from the group consisting of boron carbide, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, silicon carbide, tantalum carbide, tantalum nitride, titanium carbide, titanium nitride, vanadium carbide, vanadium nitride, zirconium carbide and zirconium nitride, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide wherein said mixture of said fluoride and metal oxide has a liquidus temperature ranging from above 1000° C. to below about 1500° C.
Claim 3
Dependent Claim
46 words
The composite according to claim 1 wherein said ceramic member ranges in amount from about 15% by volume to about 65% by volume of said composite, and said fluoride-containing member ranges in amount from about 35% by volume to about 85% by volume of said composite.
Claim 4
Dependent Claim
14 words
The composite according to claim 1 wherein said ceramic member is particulate in form.
Claim 5
Dependent Claim
16 words
The composite according to claim 1 wherein said ceramic member is in the form of filaments.
Claim 6
Dependent Claim
19 words
The composite according to claim 1 wherein said ceramic member is comprised of a mixture of particles and filaments.
Claim 7
Dependent Claim
25 words
The composite according to claim 1 wherein said metal oxide is selected from the group consisting of magnesium oxide, calcium oxide and a mixture thereof.
Claim 8
Dependent Claim
13 words
The composite according to claim 1 wherein said ceramic member is silicon carbide.
Claim 9
Dependent Claim
16 words
The composite according to claim 1 wherein said porosity is less than about 5% by volume.
Claim 10
Dependent Claim
15 words
The composite according to claim 1 wherein said porosity is less than 1% by volume.
Claim 11
Dependent Claim
162 words
A polycrystalline composite comprised of a ceramic member in an amount ranging from about 15% by volume to about 65% by volume of the composite and a fluoride-containing member in amount from about 35% by volume to about 85% by volume of the composite, said composite having a porosity of less than about 5% by volume of said composite, said ceramic member being selected from the group consisting of boron carbide, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, silicon carbide, tantalum carbide, tantalum nitride, titanium carbide, titanium nitride, vanadium carbide, vanadium nitride, zirconium carbide and zirconium nitride, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide selected from the group consisting of magnesium oxide, calcium oxide, alumina and a mixture of said oxide.
Claim 12
Dependent Claim
162 words
A polycrystalline composite comprised of a ceramic member in an amount ranging from about 15% by volume to about 65% by volume of the composite and a fluoride-containing member in amount from about 35% by volume to about 85% by volume of the composite, said composite having a porosity of less than about 5% by volume of said composite, said ceramic member being selected from the group consisting of boron carbide, hafnium carbide, hafnium nitride, niobium carbide, niobium nitride, silicon carbide, tantalum carbide, tantalum nitride, titanium carbide, titanium nitride, vanadium carbide, vanadium nitride, zirconium carbide and zirconium nitride, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide selected from the group consisting of magnesium oxide, calcium oxide, alumina and a mixture of said oxide.
Claim 13
Dependent Claim
14 words
The composite according to claim 10 wherein said ceramic member is particulate in form.
Claim 14
Dependent Claim
16 words
The composite according to claim 10 wherein said ceramic member is in the form of filaments.
Claim 15
Dependent Claim
19 words
The composite according to claim 10 wherein said ceramic member is comprised of a mixture of particles and filaments.
Claim 16
Dependent Claim
13 words
The composite according to claim 10 wherein said ceramic member is silicon carbide.
Claim 17
Dependent Claim
18 words
The composite according to claim 10 wherein said composite has a porosity of less than 1% by volume.
Claim 18
Dependent Claim
89 words
A polycrystalline composite comprised of silicon carbide in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 5% by volume of said composite, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride and yttrium fluoride.
Claim 19
Dependent Claim
89 words
A polycrystalline composite comprised of silicon carbide in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 5% by volume of said composite, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride and yttrium fluoride.
Claim 20
Dependent Claim
46 words
The composite according to claim 16 wherein said silicon carbide ranges in amount from about 15% by volume to about 65% by volume of said composite, and said fluoride-containing member ranges in amount from about 35% by volume to about 85% by volume of said composite.
Claim 21
Dependent Claim
14 words
The composite according to claim 16 wherein said ceramic member is particulate in form.
Claim 22
Dependent Claim
16 words
The composite according to claim 16 wherein said ceramic member is in the form of filaments.
Claim 23
Dependent Claim
18 words
The composite according to claim 16 wherein said composite has a porosity of less than 1% by volume.
Claim 24
Dependent Claim
142 words
A polycrystalline composite comprised of silicon nitride in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member ranging in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 10% by volume of said composite, said silicon nitride being particulate in form and/or in the form of filaments, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide wherein said mixture of said fluoride and metal oxide has a liquidus temperature ranging from above 1000° C. to below about 1500° C.
Claim 25
Dependent Claim
142 words
A polycrystalline composite comprised of silicon nitride in an amount ranging from about 5% by volume to about 70% by volume of the composite and a fluoride-containing member ranging in amount from about 30% by volume to about 95% by volume of the composite, said composite having a porosity of less than about 10% by volume of said composite, said silicon nitride being particulate in form and/or in the form of filaments, said fluoride-containing member being selected from the group consisting of barium fluoride, calcium fluoride, magnesium fluoride, strontium fluoride, cerium fluoride, dysprosium fluoride, gadolinium fluoride, lanthanum fluoride, samarium fluoride, yttrium fluoride and a mixture of at least about 10% by volume of said fluoride and a metal oxide wherein said mixture of said fluoride and metal oxide has a liquidus temperature ranging from above 1000° C. to below about 1500° C.
Claim 26
Dependent Claim
14 words
The composite according to claim 21 wherein said silicon nitride is particulate in form.
Claim 27
Dependent Claim
16 words
The composite according to claim 21 wherein said silicon nitride is in the form of filaments.
Claim 28
Dependent Claim
19 words
The composite according to claim 21 wherein said silicon nitride is comprised of a mixture of particles and filaments.
Claim 29
Dependent Claim
46 words
The composite according to claim 21 wherein said silicon nitride ranges in amount from about 15% by volume to about 65% by volume of said composite, and said fluoride-containing member ranges in amount from about 35% by volume to about 85% by volume of said 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) | 1990-01-12 | 1990-07-14 | 1991-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-01-12 | 1994-07-14 | 1995-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-01-12 | 1998-07-14 | 1999-01-13 | $7700.00 | Window Closed / Lapsed |