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US4883780A
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Aluminum nitride sintered body and preparation thereof
Assignee: Toshiba Corp
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Filing: 1988-02-11
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Granted: 1989-11-28
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Expires: 2008-02-11
Abstract
Abstract There are disclosed an aluminum sintered body comprising (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 containing said element, and a process for preparing the same comprising mixing aluminum nitride with (i) at least one of compound selected from the group consisting of a rare earth metal and/or an alkaline earth metal; and (ii) at least one of element selected from the group consisting of a transition element of Groups IVa, Va, VIa, VIIa and VIII of the periodic table, and/or at least one of a compound containing said element; and then molding and sintering the mixture.
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 05:36
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
143 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, 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 hafnium, molybdenum, tungsten, the Group Va elements, the Group VIIa elements and the Group VIII elements, and/or at least one compound comprising said element, wherein the content of constituent (b) is 0.01 to 18% by weight in terms of respective oxides of said rare earth and/or alkaline earth metal, and wherein the content of constituent (c) is 0.01 to 15% by weight in terms of oxide of said transition element.
Claim 2
Dependent Claim
143 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, 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 hafnium, molybdenum, tungsten, the Group Va elements, the Group VIIa elements and the Group VIII elements, and/or at least one compound comprising said element, wherein the content of constituent (b) is 0.01 to 18% by weight in terms of respective oxides of said rare earth and/or alkaline earth metal, and wherein the content of constituent (c) is 0.01 to 15% by weight in terms of oxide of said transition element.
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
39 words
The aluminum nitride sintered body according to claim 1, wherein constituent (b) is at least one aluminum compound of a rare earth metal wherein said rare earch metal is selected from the group consisting of Y, La and Ce.
Claim 5
Dependent Claim
39 words
the aluminum nitride sintered body according to claim 1, wherein constituent (b) is at least one aluminum compound of an alkaline earth metal wherein said alkaline earth metal is selected from the group consisting of Ca, Sr and Ba.
Claim 6
Dependent Claim
33 words
The aluminum nitride sintered body according to claim 1, wherein said transition elements of Groups Va, VIIa and VIII are selected from the group consisting of Hf, Ni, Mn, Fe, Co and V.
Claim 7
Dependent Claim
19 words
The aluminum nitride sintered body according to claim 1, wherein the constituent (b) is an oxide and/or an oxyfluoride.
Claim 8
Dependent Claim
20 words
The aluminum nitride sintered body according to claim 1, wherein constituent (c) is a nitride compound containing said transition element.
Claim 9
Dependent Claim
45 words
The aluminum nitride sintered body according to claim 1, where constituent (c) is at least one element selected from the transition elements consisting of hafnium, the Group Va elements, the Group VIIa elements, the Group VIII elements and/or at least one compound comprising said element.
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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) | 1992-11-27 | 1993-05-29 | 1993-11-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-27 | 1997-05-29 | 1997-11-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-27 | 2001-05-29 | 2001-11-28 | $7700.00 | Window Closed / Lapsed |