US5214005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Glass-aluminum nitride composite material
Assignee: Sumitomo Electric Industries Ltd
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Filing: 1992-01-14
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Granted: 1993-05-25
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Expires: 2012-01-14
Abstract
Abstract A glass-aluminum nitride composite comprising a sintered body is produced by adding glass powder to aluminum nitride grains having an oxygen content of less than 2% and a mean grain diameter of 1.0 μm or more and subjecting the mixture to molding and sintering. A suitable glass is one based on borosilicate and the addition of an AlN whisker serves to improve the strength. The composite material of the present invention has a high heat conductivity, a low permittivity and a high strength and is suitable as a semiconductor packaging material.
Inventors
- 👤 Akira Yamakawa
- 👤 Koichi Sogabe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:00
CPC Classifications
H; H10; H10W; H10W70/00; H10W70/60; H10W70/67; H10W70/69; H10W70/692; C; C03; C03C; C03C14/00; C03C14/004; C04; C04B; C04B35/00; C04B35/515; C04B35/58; C04B35/581; C04B35/71; C04B35/78; C04B35/80; C03C2214/00; C03C2214/04; C03C2214/06; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/36; C04B2235/365; C04B2235/38; C04B2235/3852; C04B2235/3865; C04B2235/3895; C04B2235/50; C04B2235/52; C04B2235/5208; C04B2235/5216; C04B2235/524; C04B2235/526; C04B2235/5264; C04B2235/5276; C04B2235/54; C04B2235/5418; C04B2235/5436; C04B2235/5445; C04B2235/60; C04B2235/602; C04B2235/6025; C04B2235/70; C04B2235/96; C04B2235/9607
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
A glass-aluminum nitride sintered body produced by adding glass powder to aluminum nitride grains to form a composite material, and molding and sintering said composite material, said glass powder comprising 30% to 60% of SiO 2 , 10% to 30% of Al 2 O 3 , 10% to 30% of B 2 O 3 , and not more than 30% of MO, wherein M is selected from the group consisting of Mg, Ca, and Sr, said aluminum nitride grains having an oxygen content of less than 2% and a mean diameter of at lest 1.0 μm, said aluminum nitride comprising 50% to 95% of said composite material, all percentages being by weight, said composite material having a heat conductivity of at least 30 w/m K.
Claim 2
Dependent Claim
125 words
A glass-aluminum nitride sintered body produced by adding glass powder to aluminum nitride grains to form a composite material, and molding and sintering said composite material, said glass powder comprising 30% to 60% of SiO 2 , 10% to 30% of Al 2 O 3 , 10% to 30% of B 2 O 3 , and not more than 30% of MO, wherein M is selected from the group consisting of Mg, Ca, and Sr, said aluminum nitride grains having an oxygen content of less than 2% and a mean diameter of at lest 1.0 μm, said aluminum nitride comprising 50% to 95% of said composite material, all percentages being by weight, said composite material having a heat conductivity of at least 30 w/m K.
Claim 3
Dependent Claim
17 words
The composite of claim 1 wherein said aluminum nitride comprises 50% to 80% of said composite material.
Claim 4
Dependent Claim
16 words
The composite of claim 1 comprising 0 to 5% by volume of an aluminum nitride whisker.
Claim 5
Dependent Claim
18 words
The composite of claim 3 wherein said aluminum nitride has one oxygen content of not more than 0.4%.
Claim 6
Dependent Claim
15 words
The body of claim 1 wherein said means diameter is not more than 10 μm.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1996-05-24 | 1996-11-23 | 1997-05-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-05-24 | 2000-11-23 | 2001-05-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-05-24 | 2004-11-23 | 2005-05-25 | $7700.00 | Window Closed / Lapsed |