US3868267A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making gradient ceramic-metal material
Assignee: United States Department of the Army
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Filing: 1972-11-09
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Granted: 1975-02-25
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Expires: 1992-11-09
Abstract
Abstract A ceramic-metal material system is fabricated by cold compressing separate adjacent volumes of different ceramic material or different particle sizes to form a porous ceramic compact; infiltrating each separate volume of the compact with a molten metal, the first separate volume of the compact being infiltrated with a metal having a higher melting point than the metal which infiltrates the second separate volume and forms an interface with the first infiltrated metal.
Inventors
- 👤 George E Gazza
- 👤 Michael W Lindley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:17
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/45; C04B41/50; C04B41/51; B; B32; B32B; B32B18/00; C04B37/00; C04B37/02; C04B37/021; C04B41/52; C04B2235/00; C04B2235/02; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/65; C04B2235/656; C04B2235/6567; C04B2235/658; C04B2235/6581; C04B2237/00; C04B2237/30; C04B2237/32; C04B2237/34; C04B2237/341; C04B2237/36; C04B2237/363; C04B2237/40; C04B2237/402; C04B2237/50; C04B2237/58; C04B2237/586; C04B2237/588; C22; C22C; C22C2204/00; Y; Y10; Y10T; Y10T428/00; Y10T428/249921; Y10T428/249953; Y10T428/249961
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
205 words
A METHOD FOR THE FABRICATION OF A CERAMIC-METAL MATERIAL COMPRISING THE STEPS OF: A. SELECTING TWO SEPARATE VOLUMES OF A CERAMIC MATERIAL SAID SEPARATE VOLUMES HAVING DIFFERENT PARTICLE SIZES, B. PLACING SAID SEPARATE VOLUMES OF A CERAMIC MATERIAL ADJACENT AND ABUTTING EACH OTHER, C. COLD COMPRESSING SAID SEPARATE VOLUMES TOGETHER TO FORM A POROUS GRADIENT CERAMIC COMPACT HAVING AN INTERFACE AT THE POINTS OF ABUTTMENT OF SAID SEPARATE VOLUMES, D. CONTACTING THE FIRST OF SAID SEPARATE VOLUMES OF SAID CERAMIC COMPACT WITH A FIRST METAL POWDER, E. HEATING IN A VACUUM SAID FIRST SEPATATE VOLUME IN CONTACT WITH A FIRST METAL POWDER ABOVE THE MELTING POINT OF SAID FIRST METAL POWDER SO THAT THE MOLTEN SAID FIRST METAL POWDER IMPREGNATES THE SAID FIRST SEPARATE VOLUME BY INFILTRATION, F. CONTACTING SECOND SAID SEPARATE VOLUME OF SAID CERAMIC COMPACT WITH A SECOND METAL POWDER HAVING A LOWER MELTING POINT THAN THE SAID FIRST METAL POWDER, AND G. HEATING IN A VACUUM SAID SECOND METAL POWDER IN CONTACT WITH SAID SECOND SEPARATE VOLUME ABOVE THE MELTING POINT OF SAID SECOND METAL POWDER BUT BELOW THE MELTING POINT OF SAID FIRST METAL POWDER SO THAT THE MOLTEN SAID SECOND METAL POWDER IMPREGNATES THE SECOND SAID SEPARATE VOLUME BY INFILTRATION.
Claim 2
Independent Claim
205 words
A METHOD FOR THE FABRICATION OF A CERAMIC-METAL MATERIAL COMPRISING THE STEPS OF: A. SELECTING TWO SEPARATE VOLUMES OF A CERAMIC MATERIAL SAID SEPARATE VOLUMES HAVING DIFFERENT PARTICLE SIZES, B. PLACING SAID SEPARATE VOLUMES OF A CERAMIC MATERIAL ADJACENT AND ABUTTING EACH OTHER, C. COLD COMPRESSING SAID SEPARATE VOLUMES TOGETHER TO FORM A POROUS GRADIENT CERAMIC COMPACT HAVING AN INTERFACE AT THE POINTS OF ABUTTMENT OF SAID SEPARATE VOLUMES, D. CONTACTING THE FIRST OF SAID SEPARATE VOLUMES OF SAID CERAMIC COMPACT WITH A FIRST METAL POWDER, E. HEATING IN A VACUUM SAID FIRST SEPATATE VOLUME IN CONTACT WITH A FIRST METAL POWDER ABOVE THE MELTING POINT OF SAID FIRST METAL POWDER SO THAT THE MOLTEN SAID FIRST METAL POWDER IMPREGNATES THE SAID FIRST SEPARATE VOLUME BY INFILTRATION, F. CONTACTING SECOND SAID SEPARATE VOLUME OF SAID CERAMIC COMPACT WITH A SECOND METAL POWDER HAVING A LOWER MELTING POINT THAN THE SAID FIRST METAL POWDER, AND G. HEATING IN A VACUUM SAID SECOND METAL POWDER IN CONTACT WITH SAID SECOND SEPARATE VOLUME ABOVE THE MELTING POINT OF SAID SECOND METAL POWDER BUT BELOW THE MELTING POINT OF SAID FIRST METAL POWDER SO THAT THE MOLTEN SAID SECOND METAL POWDER IMPREGNATES THE SECOND SAID SEPARATE VOLUME BY INFILTRATION.
Claim 3
Dependent Claim
22 words
A method in accordance with claim 1 wherein the said ceramic material is selected from the group consisting of A1B12 and B4C.
Claim 4
Dependent Claim
50 words
A method in accordance with claim 1 wherein one of the said two separate volumes of said ceramic material is composed of particles 37 microns and less in size, and wherein the second said separate volume of said ceramic material is composed of particles greater than 37 microns in size.
Claim 5
Dependent Claim
21 words
A method in accordance with claim 1 wherein said first metal powder is silicon and said second metal powder is aluminum.
Claim 6
Independent Claim
29 words
A METHOD FOR THE FABRICATION OF A CERAMIC-METAL MATERIAL COMPRISING THE STEPS OF: A. SELECTING TWO SEPARATE VOLUMES OF A CERAMIC MATERIAL SAID SEPARATE VOLUMES BEING DIFFERENT CERAMIC MATERIALS,
Claim 7
Independent Claim
29 words
A METHOD FOR THE FABRICATION OF A CERAMIC-METAL MATERIAL COMPRISING THE STEPS OF: A. SELECTING TWO SEPARATE VOLUMES OF A CERAMIC MATERIAL SAID SEPARATE VOLUMES BEING DIFFERENT CERAMIC MATERIALS,
Claim 8
Dependent Claim
36 words
A method in accordance with claim 5 wherein the said first separate volume contain B4C of particle size less than 43 microns, and the second separate volume contains SiB6 of particle size less than 43 microns.
Claim 9
Dependent Claim
23 words
A method in accordance with claim 5 wherein the said first metal powder is silicon and the second said metal powder is aluminum.
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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) | 1978-02-24 | 1978-08-26 | 1979-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-24 | 1982-08-26 | 1983-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-24 | 1986-08-26 | 1987-02-25 | $7700.00 | Window Closed / Lapsed |