US4990470A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High-strength and high-toughness sinter and process for producing the same
Assignee: Ube Corp
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Filing: 1988-10-31
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Granted: 1991-02-05
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Expires: 2008-10-31
Abstract
Abstract The high-strength and high-toughness sinter of the present invention comprises a crystal agglomerate maintaining a fibrous shape and composed of crystals of SiC and MC 1-x wherein M is Ti and/or Zr and X is a number of 0 or more but less than 1. This sinter is produced by laminating an inorganic fiber comprising a particular inorganic material containing titanium and/or zirconium molding the laminate into a predetermined shape, and conducting heat-sintering simultaneously with the molding or after the molding in an atmosphere comprising at least one member selected from the group consisting of a vacuum, an inert gas, a reducing gas, and a hydrucoarbon gas at a temperature of 1,700° to 2,200° C.
Inventors
- 👤 Takemi Yamamura
- 👤 Toshihiro Ishikawa
- 👤 Makoto Tamura
- 👤 Masaki Shibuya
- 👤 Kiyohito Okamura
- 👤 Mitsuhiko Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:21
CPC Classifications
C; C04; C04B; C04B30/00; C04B30/02; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/571; C04B35/575; C04B35/622; C04B35/64; C04B35/645; C04B35/71; C04B35/78; C04B35/80
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
61 words
A high-strength and high-toughness sinter comprising a crystal agglomerate maintaining a fibrous shape and composed of crystals of SiC and MC 1-x wherein M is Ti and/or Zr and x is a number of 0 or more but less than 1, wherein the sections of at least part of the fibers of said crystal agglomerate are deformed into a polygonal shape.
Claim 2
Dependent Claim
61 words
A high-strength and high-toughness sinter comprising a crystal agglomerate maintaining a fibrous shape and composed of crystals of SiC and MC 1-x wherein M is Ti and/or Zr and x is a number of 0 or more but less than 1, wherein the sections of at least part of the fibers of said crystal agglomerate are deformed into a polygonal shape.
Claim 3
Dependent Claim
63 words
A high-strength and high-toughness sinter according to claim 1, wherein said crystal agglomerate maintaining a fibrous shape comprises massive, flaky and/or acicular SiC crystals and grain crystals each having a diameter of 500 Angstroms or less and essentially consisting of SiC and MC 1-x wherein M is Ti and/or Zr and x is a number of 0 or more but less than 1.
Claim 4
Dependent Claim
40 words
A high-strength and high-toughness sinter according to claim 1, wherein said fibrous shape crystal agglomerate is one wherein its section is deformed into a polygonal shape as will be able to most effectively closely pack to fill up fiber gas.
Claim 5
Dependent Claim
31 words
A high-strength and high-toughness sinter according to claim 1, wherein said crystal agglomerate each maintaining a fibrous shape are linked or bonded to each other without the intervention of any matrix.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-02-04 | 1994-08-06 | 1995-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-02-04 | 1998-08-06 | 1999-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-02-04 | 2002-08-06 | 2003-02-05 | $7700.00 | Window Closed / Lapsed |