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US5001089A
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Aluminum nitride sintered body
Assignee: Toshiba Corp
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Filing: 1989-09-06
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Granted: 1991-03-19
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Expires: 2009-09-06
Abstract
Abstract There is disclosed an aluminum sintered body prepared by sintering aluminum nitride and additives, which consists essentially of (a) aluminum nitride, (b) at least one compound selected from the group consisting of an aluminum compound of a rare earth metal, an aluminum compound of an alkaline earth metal, and an aluminum compound of a rare earth metal and an alkaline earth metal, and (c) at least one element selected from the transition elements consisting of Groups IVa, Va, VIa, VIIa and VIII of the periodic table, and/or at least one compound comprising the element, and the rare earth element, alkaline earth element and transition element are supplied by the additives.
Inventors
- 👤 Mituo Kasori
- 👤 Kazuo Shinozaki
- 👤 Kazuo Anzai
- 👤 Akihiko Tsuge
- 👤 Hiroshi Imagawa
- 👤 Takeshi Takano
- 👤 Fumio Ueno
- 👤 Akihiro Horiguchi
- 👤 Hiroshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:33
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
133 words
An aluminum nitride sintered body prepared by sintering aluminum nitride and additives, which consists essentially of (a) aluminum nitride, (b) at least one compound selected from the group consisting of an aluminum compound of a rare earth metal and an aluminum compound of a rare earth metal and an alkaline earth metal, and (c) at least one material selected from the group consisting of titanium, zirconium, and a compound comprising titanium or zirconium, wherein said rare earth metal, said alkaline earth metal and said material are supplied by said additives, the content of constituent (b) is 0.01 to 18% by weight in terms of respective oxides of said rare earth and alkaline earth metal, and the content of constituent (c) is 0.01 to 15% by weight in terms of oxide of said material.
Claim 2
Dependent Claim
133 words
An aluminum nitride sintered body prepared by sintering aluminum nitride and additives, which consists essentially of (a) aluminum nitride, (b) at least one compound selected from the group consisting of an aluminum compound of a rare earth metal and an aluminum compound of a rare earth metal and an alkaline earth metal, and (c) at least one material selected from the group consisting of titanium, zirconium, and a compound comprising titanium or zirconium, wherein said rare earth metal, said alkaline earth metal and said material are supplied by said additives, the content of constituent (b) is 0.01 to 18% by weight in terms of respective oxides of said rare earth and alkaline earth metal, and the content of constituent (c) is 0.01 to 15% by weight in terms of oxide of said material.
Claim 3
Dependent Claim
21 words
The aluminum nitride sintered body according to claim 1, wherein the content of aluminum nitride is 80 to 99.98% by weight.
Claim 4
Dependent Claim
26 words
The aluminum nitride sintered body according to claim 1 wherein said rare earth metal is selected from the group of consisting of Y, La and Ce.
Claim 5
Dependent Claim
25 words
The aluminum nitride sintered body according to claim 1, wherein said alkaline earth metal is selected from the group consisting of Ca, Sr and Ba.
Claim 6
Dependent Claim
48 words
The aluminum nitride sintered body according to claim 1, wherein at least one of compound selected from the group consisting of aluminum compound of a rare earth metal and an aluminum compound of a rare earth metal and an alkaline earth metal is an oxide and/or an oxyfluoride.
Claim 7
Dependent Claim
36 words
The aluminum nitride sintered body according to claim 1, wherein said sintered body has a darker color than a sintered body having the same composition as recited in claim 1 except for lacking said (c) component.
Claim 8
Dependent Claim
26 words
The aluminum nitride sintered body according to claim 6, wherein the color sintered body is selected from the group consisting of dark gray and dark brown.
Claim 9
Dependent Claim
25 words
The aluminum nitride sintered body according to claim 1, wherein said sintered body has a three-point bending strength of at least 52 kg/mm 2 .
Claim 10
Dependent Claim
23 words
The aluminum nitride sintered body according to claim 1, wherein said sintered body has a thermal conductivity of at east 60 W/m k.
Claim 11
Dependent Claim
13 words
The aluminum nitride body according to claim 1, wherein said material comprises Ti.
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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) | 1994-03-18 | 1994-09-17 | 1995-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-03-18 | 1998-09-17 | 1999-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-03-18 | 2002-09-17 | 2003-03-19 | $7700.00 | Window Closed / Lapsed |