US5242872A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for producing aluminum nitride sintered body
Assignee: Tokuyama Corp
•
Filing: 1991-06-28
•
Granted: 1993-09-07
•
Expires: 2011-06-28
Abstract
Abstract A process for producing a sintered body of aluminum nitride, which comprises mixing an aluminum nitride powder with (A) an alkaline earth metal aluminate, or both of (A-1) an oxide or oxide-forming compound of aluminum, and (A-2) an oxide or oxide-forming compound of an alkaline earth metal, and (B) an oxide or oxide-forming compound of yttrium or an element of the lanthanide series, and firing the resulting mixture.
Inventors
- 👤 Hitofumi Taniguchi
- 👤 Nobuyuki Kuramoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 17:10
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
127 words
A process for producing a sintered body of aluminum nitride, which consists essentially of adding to an aluminum nitride powder, based on the total weight of the aluminum nitride powder, (A-1) at least 0.34% by weight of an oxide or oxide-forming compound of aluminum, (A-2) at least 0.62% by weight of an oxide or oxide-forming compound of an alkaline earth metal, the total amounts of (A-1) and (A-2) being at most 10% by weight, the (A-2)/(A-1) molar ratio being 0.3 to 12, and (B) 0.2 to 5% by weight of an oxide or oxide-forming compound of yttrium or an element of the lanthanide series, and firing the resulting mixture to form a sintered body having a good transmittance and a thermal conductivity of 209 to 260 W/m-k.
Claim 2
Dependent Claim
127 words
A process for producing a sintered body of aluminum nitride, which consists essentially of adding to an aluminum nitride powder, based on the total weight of the aluminum nitride powder, (A-1) at least 0.34% by weight of an oxide or oxide-forming compound of aluminum, (A-2) at least 0.62% by weight of an oxide or oxide-forming compound of an alkaline earth metal, the total amounts of (A-1) and (A-2) being at most 10% by weight, the (A-2)/(A-1) molar ratio being 0.3 to 12, and (B) 0.2 to 5% by weight of an oxide or oxide-forming compound of yttrium or an element of the lanthanide series, and firing the resulting mixture to form a sintered body having a good transmittance and a thermal conductivity of 209 to 260 W/m-k.
Claim 3
Dependent Claim
25 words
The process of claim 1 wherein the component (A-1) is selected from the group consisting of aluminum oxide, aluminum hydroxide, aluminum nitrate and aluminum acetate.
Claim 4
Dependent Claim
24 words
The process of claim 1 wherein the alkaline earth metal in component (A-2) is selected from the group consisting of calcium, strontium and barium.
References Cited (Backward Citations)
EP0015421A1
Cited
US4327187A
Cited
GB2063302A
Cited
EP0071997A1
Cited
JPS5855377A
Cited
US4435513A
Cited
GB2140458A
Cited
JPS60141607A
Cited
US4642298A
Cited
US4746637A
Cited
JPS61122168A
Cited
US5077245A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1996-09-06 | 1997-03-08 | 1997-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-09-06 | 2001-03-08 | 2001-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-09-06 | 2005-03-08 | 2005-09-07 | $7700.00 | Window Closed / Lapsed |