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US4067742A
Expired / Lapsed
US
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Thermal shock and erosion resistant tantalum carbide ceramic material
Assignee: National Aeronautics and Space Administration
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Filing: 1976-04-01
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Granted: 1978-01-10
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Expires: 1996-04-01
Abstract
Abstract Ceramic tantalum carbide artifacts having high thermal shock and mechanical erosion resistance are provided by incorporating tungsten-rhenium and carbon particles in a tantalum carbide matrix. The mix is sintered by hot pressing to form the ceramic article which has a high fracture strength relative to its elastic modulus and thus has an improved thermal shock and mechanical erosion resistance. The tantalum carbide is preferable less than minus 100 mesh, the carbon particles are preferable less than minus 100 mesh, and the tungsten-rhenium particles are preferable elongate, having a length to thickness ratio of at least 2/1. Tungsten-rhenium wire pieces are suitable as well as graphite particles.
Inventors
- 👤 with respect to an invention of Fletcher James C. Administrator of the National Aeronautics and Space Administration
- 👤 Leroy Honeycutt, III
- 👤 Charles R. Manning, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/515; C04B35/56; C04B35/5607; C04B35/71; C04B35/74; C04B35/76; Y; Y10; Y10S; Y10S60/00; Y10S60/909
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
105 words
A ceramic artifact adaptable for use in throat areas of rocket nozzles and the like which consists of a hot-pressed composite of at least 80 to 85 percent of theoretical density of a tantalum carbide matrix and from one to five percent by weight, based on the weight of the article, of particles of a metal selected from the group consisting of tungsten and tungsten-rhenium alloy, and from one to three percent by weight based on the weight of the article, of carbon or graphite particles and wherein the tantalum carbide matrix is formed from the group consisting of reactor grade and commercial grade particles.
Claim 2
Dependent Claim
105 words
A ceramic artifact adaptable for use in throat areas of rocket nozzles and the like which consists of a hot-pressed composite of at least 80 to 85 percent of theoretical density of a tantalum carbide matrix and from one to five percent by weight, based on the weight of the article, of particles of a metal selected from the group consisting of tungsten and tungsten-rhenium alloy, and from one to three percent by weight based on the weight of the article, of carbon or graphite particles and wherein the tantalum carbide matrix is formed from the group consisting of reactor grade and commercial grade particles.
Claim 3
Dependent Claim
24 words
A ceramic artifact according to claim 1 wherein the metal is tungsten and the amount of tungsten is from one to three weight percent.
Claim 4
Dependent Claim
25 words
A ceramic artifact according to claim 1 wherein the metal is tungsten-rhenium and the amount of tungsten-rhenium alloy is from one to three weight percent.
Claim 5
Dependent Claim
31 words
A ceramic artifact according to claim 1 wherein said metal particles are elongate pieces having a thickness of up to about 0.05 inches and a length/thickness ratio of at least 2/1.
Claim 6
Dependent Claim
23 words
A ceramic artifact according to claim 4 wherein the metal particles are wire pieces having a length/diameter ratio of between 5/1 and 100/1.
Claim 7
Dependent Claim
20 words
A ceramic artifact as in claim 1 wherein the carbon or graphite particles are between minus 100 mesh and minus
Claim 8
Independent Claim
95 words
A method of making a ceramic article having high resistance to thermal shock comprising the steps of providing a mixture of particles of commercial grade tantalum carbide, from one to five percent by weight of a metal selected from the group consisting of tungsten and tungsten-rhenium alloy, and from one to three percent by weight of carbon or graphite particles and hot pressing the mixture in the temperature range of from 1700° C. to 2150° C. and at a pressure sufficient to produce an article of at least 80 to 85 percent of theoretical density.
Claim 9
Independent Claim
95 words
A method of making a ceramic article having high resistance to thermal shock comprising the steps of providing a mixture of particles of commercial grade tantalum carbide, from one to five percent by weight of a metal selected from the group consisting of tungsten and tungsten-rhenium alloy, and from one to three percent by weight of carbon or graphite particles and hot pressing the mixture in the temperature range of from 1700° C. to 2150° C. and at a pressure sufficient to produce an article of at least 80 to 85 percent of theoretical density.
Claim 10
Dependent Claim
26 words
A method according to claim 7 wherein the mixture is hot pressed at a pressure in the range of 1000 to 10,000 pounds per square inch.
Claim 11
Dependent Claim
24 words
A method according to claim 7 wherein the tantalum carbide particles are in the range of minus 100 mesh and minus 300 mesh size.
Claim 12
Dependent Claim
35 words
A method according to claim 7 wherein the metal is tungsten and the tungsten particles are elongate pieces having a thickness of up to about 0.05 inches and a length/thickness ratio of at least 2/1.
Claim 13
Dependent Claim
37 words
A method according to claim 7 wherein the metal is tungsten-rhenium alloy and the tungsten-rhenium alloy particles are wire pieces having a thickness of up to about 0.05 inches and a length/thickness ratio of at least 2/1.
Claim 14
Dependent Claim
22 words
A method according to claim 7 wherein the metal particles are elongate wire pieces having a length/diameter ratio of at least 5/1.
Claim 15
Dependent Claim
25 words
A method according to claim 7 wherein the carbon or graphite particles are in the size range of minus 100 mesh to minus 325 mesh.
Claim 16
Dependent Claim
19 words
A method according to claim 7 wherein the metal is tungsten wire alloyed with 25 percent weight of rhenium.
References Cited (Backward Citations)
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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) | 1981-01-09 | 1981-07-11 | 1982-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-01-09 | 1985-07-11 | 1986-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-01-09 | 1989-07-11 | 1990-01-10 | $7700.00 | Window Closed / Lapsed |