US4655830A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High density compacts
Assignee: New Mexico Tech Research Foundation
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Filing: 1985-06-21
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Granted: 1987-04-07
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Expires: 2005-06-21
Abstract
Abstract This invention relates to the manufacture of compacts of ceramic composition, cermets, and other high hardness materials by applying explosive shock during exothermic sintering of such powders.
Inventors
- 👤 Tomotsu Akashi
- 👤 Akira Sawaoka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 04:47
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/65; B; B01; B01J; B01J3/00; B01J3/06; B01J3/08; B22; B22F; B22F3/00; B22F3/02; B22F3/08; C04B35/515; C04B35/56; C04B35/5607; C04B35/5611; C04B35/563; C04B35/565; C04B35/575; C04B35/58; C04B35/583; C04B35/5831; C04B35/584; C04B35/593; C04B35/651; C22; C22C; C22C1/00; C22C1/04; C22C1/05; C22C1/051; Y; Y10; Y10S; Y10S100/00; Y10S100/911; Y10S264/00; Y10S264/36
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
27 words
An improved process for forming compacts of powders of ceramics, cermets and other high hardness materials which comprises applying explosive shock with exothermic sintering of such powders.
Claim 2
Dependent Claim
27 words
An improved process for forming compacts of powders of ceramics, cermets and other high hardness materials which comprises applying explosive shock with exothermic sintering of such powders.
Claim 3
Dependent Claim
39 words
An improved process for forming compacts of powders of ceramics, cermets, and other high hardness materials which comprises applying explosive shock with the exothermic sintering, which is achieved by mixing the exothermic ingredients with the powders to be compacted.
Claim 4
Dependent Claim
39 words
An improved process for forming compacts of powders of ceramics, cermets, and other high hardness materials which comprises applying explosive shock with the exothermic sintering, which is achieved by mixing the exothermic ingredients with the powders to be compacted.
Claim 5
Dependent Claim
50 words
An improved process for forming compacts of powders of ceramics, cermets and other high hardness materials, which comprises applying explosive shock with the exothermic sintering of such powders, said sintering being accomplished by providing at least one separate layer of the exothermic composition adjacent to the powder to be compacted.
Claim 6
Dependent Claim
50 words
An improved process for forming compacts of powders of ceramics, cermets and other high hardness materials, which comprises applying explosive shock with the exothermic sintering of such powders, said sintering being accomplished by providing at least one separate layer of the exothermic composition adjacent to the powder to be compacted.
Claim 7
Dependent Claim
34 words
The process for the reaction sintering of a plurality of powdered ingredients to form a compact of a composite, which process comprises applying explosive shock to said powders and heating with an exothermic composition.
Claim 8
Dependent Claim
34 words
The process for the reaction sintering of a plurality of powdered ingredients to form a compact of a composite, which process comprises applying explosive shock to said powders and heating with an exothermic composition.
Claim 9
Dependent Claim
36 words
The process of claim 4 wherein the powder mixture was titanium oxide, carbon and aluminum, the exothermic reaction mixture was a thermite mixture, and the resulting composite was titanium carbide--aluminum oxide (TiC--Al 2 O 3 ).
Claim 10
Dependent Claim
49 words
The process of claim 3 wherein the powder to be compacted is silicon carbide (SiC) and the exothermic compositions are disposed in separate layers above and below the silicon carbide layer, and are selected from the group consisting of titanium and carbon (Ti--C) and titanium oxide--carbon--aluminum (TiO 2 --C--Al).
Claim 11
Dependent Claim
31 words
The process of claim 2 wherein the exothermic ingredients mixed in are titanium and carbon (Ti--C) and titanium and aluminum (Ti--Al) and the powder to be compacted is cubic boron nitride.
Claim 12
Dependent Claim
29 words
The process of claim 3 wherein a powder compact of boron carbide (B 4 C) was prepared by shock sintering between exothermic sandwich layers of titanium and carbon mixtures.
Claim 13
Dependent Claim
31 words
The process of claim 3 wherein a powder compact of aluminum carbide (Al 4 C 3 ) was prepared by shock sintering between exothermic sandwich layers of titanium and carbon mixtures.
Claim 14
Dependent Claim
32 words
Improved compacts of powders of ceramics, cermets and other high hardness materials characterized by enhanced hardness as a result of applying explosive shock to the powders with exothermic sintering of such powders.
Claim 15
Dependent Claim
32 words
Improved compacts of powders of ceramics, cermets and other high hardness materials characterized by enhanced hardness as a result of applying explosive shock to the powders with exothermic sintering of such powders.
Claim 16
Dependent Claim
28 words
An assembly for producing compacts of powders of ceramics, cermets and other high hardness materials, which comprises a powder receptacle, exothermic composition, and an explosive shock wave generator.
Claim 17
Dependent Claim
28 words
An assembly for producing compacts of powders of ceramics, cermets and other high hardness materials, which comprises a powder receptacle, exothermic composition, and an explosive shock wave generator.
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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) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |