Patent US4417906A successfully refreshed from Google Patents.
US4417906A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for production of silicon carbide composite
Assignee: Carboloy Inc
•
Filing: 1981-10-20
•
Granted: 1983-11-29
•
Expires: 2001-10-20
Abstract
Abstract A process for producing a sintered silicon carbide composite includes the steps of forming a first dispersion of diamond crystals and carbon black in paraffin, as well as forming a second dispersion of carbon fiber, carbon black and filler in paraffin. The two dispersions are compacted together to form an integral bi-layer composite which is then subjected to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of the paraffin. Silicon is heated to cause liquification and direct infiltration into both layers of the composite after which the composite is sintered under conditions sufficient to produce a β-silicon carbide binder uniting the composite.
Inventors
- 👤 John M. Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/626; C04B35/628; C04B35/62802; C04B35/62828; C04B35/62839; B; B01; B01J; B01J3/00; B01J3/06; B01J3/062; B24; B24D; B24D3/00; B24D3/02; B24D3/04; B24D3/06; C04B35/515; C04B35/52; C04B35/528; C04B35/532; C04B35/56; C04B35/565; C04B35/573; C04B35/62605; C04B35/62625; C04B35/6264; C04B35/62892; C04B35/63; C04B35/6303; C04B35/6316; C04B37/00; C04B37/001; B01J2203/00; B01J2203/06; B01J2203/0605; B01J2203/062; B01J2203/063; B01J2203/0635; B01J2203/065; B01J2203/0655; B01J2203/0675; B01J2203/0685; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/38; C04B2235/3817; C04B2235/3826; C04B2235/383; C04B2235/3834; C04B2235/42; C04B2235/422; C04B2235/424; C04B2235/427; C04B2235/428; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/5248; C04B2235/60; C04B2235/604; C04B2235/606; C04B2235/616; C04B2235/65; C04B2235/658; C04B2235/6581; C04B2235/70; C04B2235/80; C04B2235/96; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/36; C04B2237/363; C04B2237/365; C04B2237/50; C04B2237/61
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
133 words
A process for preparing a bonded composite comprising: (a) blending diamond crystals and carbon black to permit an even coating of said diamond crystal surfaces; (b) forming a first dispersion of said blended diamond crystals and carbon black in paraffin; (c) forming a second dispersion of carbon fiber, carbon black and filler in paraffin; (d) compacting said dispersions together to produce an integral bilayer composite; (e) subjecting said composite to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of said paraffin; (f) placing said composite in direct contact with elemental silicon; (g) heating said silicon to cause liquification and infiltration into both layers of said composite; and (h) sintering the composite and infiltrated silicon under conditions sufficient to produce a β-silicon carbide binder uniting said composite.
Claim 2
Dependent Claim
133 words
A process for preparing a bonded composite comprising: (a) blending diamond crystals and carbon black to permit an even coating of said diamond crystal surfaces; (b) forming a first dispersion of said blended diamond crystals and carbon black in paraffin; (c) forming a second dispersion of carbon fiber, carbon black and filler in paraffin; (d) compacting said dispersions together to produce an integral bilayer composite; (e) subjecting said composite to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of said paraffin; (f) placing said composite in direct contact with elemental silicon; (g) heating said silicon to cause liquification and infiltration into both layers of said composite; and (h) sintering the composite and infiltrated silicon under conditions sufficient to produce a β-silicon carbide binder uniting said composite.
Claim 3
Dependent Claim
24 words
The process of claim 1, wherein the carbon black of the first dispersion comprises between 1% and 3% by weight of the diamond crystals.
Claim 4
Dependent Claim
32 words
The process of claim 2, wherein the first dispersion is formed by mixing the carbon black and the diamond crystals and then incorporating from 3 to 6% of paraffin by total weight.
Claim 5
Dependent Claim
19 words
The process of claim 3, wherein the second dispersion comprises from 3 to 6% of paraffin by total weight.
Claim 6
Dependent Claim
21 words
The process of claim 3, wherein the filler comprises from 40 to 75% β-silicon carbide by weight of the second dispersion.
Claim 7
Dependent Claim
21 words
The process of claim 3, wherein the filler comprises from 40 to 75% α-silicon carbide by weight of the second dispersion.
Claim 8
Dependent Claim
19 words
The process of claim 5, wherein sintering is performed in a vacuum at a temperature below about 1500° C.
Claim 9
Dependent Claim
20 words
The process of claim 7, wherein the sintered composite contains between about 5 to 14% free silicon by total weight.
Claim 10
Dependent Claim
17 words
The process of claim 8, wherein the diamond crystals are of a size less than 400 mesh.
Claim 11
Dependent Claim
19 words
The process of claim 6, wherein sintering is performed in a vacuum at a temperature below about 1500° C.
Claim 12
Dependent Claim
19 words
The process of claim 10 wherein the body contains between about 5 to 14% free silicon by total weight.
Claim 13
Dependent Claim
17 words
The process of claim 11 wherein the diamond crystals are of a size less than 400 mesh.
Claim 14
Dependent Claim
140 words
A process for preparing a bonded composite comprising: (a) blending diamond crystals and carbon black to permit an even coating of said diamond crystal surfaces; (b) forming a first dispersion of said blended diamond crystals and carbon black in paraffin; p1 (c) forming a second dispersion of carbon fiber, carbon black and filler in paraffin; (d) compacting said dispersions together to produce an integral bi-layer composite; (e) placing said composite in direct contact with elemental silicon; (f) subjecting said composite to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of said paraffin; (g) heating said silicon in contact with said composite to cause said silicon to liquiefy and infiltrate both layers of said composite; and (h) sintering the composite and infiltrated silicon under conditions sufficient to produce a β-silicon carbide uniting said composite.
Claim 15
Dependent Claim
140 words
A process for preparing a bonded composite comprising: (a) blending diamond crystals and carbon black to permit an even coating of said diamond crystal surfaces; (b) forming a first dispersion of said blended diamond crystals and carbon black in paraffin; p1 (c) forming a second dispersion of carbon fiber, carbon black and filler in paraffin; (d) compacting said dispersions together to produce an integral bi-layer composite; (e) placing said composite in direct contact with elemental silicon; (f) subjecting said composite to a vacuum for a period of time at a temperature sufficient to vaporize essentially all of said paraffin; (g) heating said silicon in contact with said composite to cause said silicon to liquiefy and infiltrate both layers of said composite; and (h) sintering the composite and infiltrated silicon under conditions sufficient to produce a β-silicon carbide uniting said composite.
Claim 16
Dependent Claim
33 words
The process of claim 13, wherein the silicon and composite are maintained in a vacuum oven to vaporize the paraffin, liquefy the silicon, infiltrate the composite and sinter the composite and infiltrate silicon.
References Cited (Backward Citations)
US2938807A
Cited
US3816081A
Cited
US4063909A
Cited
US4018631A
Cited
US4220677A
Cited
US4120731A
Cited
US4219339A
Cited
US4173614A
Cited
US4168957A
Cited
US4171339A
Cited
US4167399A
Cited
US4124401A
Cited
US4151686A
Cited
US4220455A
Cited
US4238433A
Cited
US4247304A
Cited
US4242106A
Cited
US4241135A
Cited
US4268582A
Cited
US4231195A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-11-28 | 1987-05-30 | 1987-11-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-11-28 | 1991-05-30 | 1991-11-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-11-28 | 1995-05-30 | 1995-11-29 | $7700.00 | Window Closed / Lapsed |