Chemistry of inorganic compounds – Nitrogen or compound thereof – Binary compound
Reexamination Certificate
2007-09-11
2007-09-11
Langel, Wayne A. (Department: 1754)
Chemistry of inorganic compounds
Nitrogen or compound thereof
Binary compound
C501S098400
Reexamination Certificate
active
11174723
ABSTRACT:
The present invention is to produce an aluminum nitride powder which is turned into a sintered body at a temperature of not more than 1600° C., thereby obtaining a sintered aluminum nitride in which the density and thermal conductivity are high and which can be properly used as a substrate material.Using a vapor phase reaction apparatus shown in FIG.1, ammonia gas was fed from a reactor2heated at from 300 to 500° C. and maintained at that temperature by a heating section1via a feeding tube4while being regulated by a flow regulator3. At the same time, while being regulated by the flow regulator5, nitrogen gas containing an organic aluminum compound is fed via a feeding tube6to obtain an aluminum nitride powder. The aluminum nitride powder is subjected to a heat treatment at from 1100 to 1500° C. in a reducing gas atmosphere and/or an inert gas atmosphere to obtain an aggregate aluminum nitride powder. The aggregate aluminum nitride powder is subjected to a mechanical treatment to obtain an aluminum nitride powder in which the specific surface area value is not less than 30 m2/g and a ratio of an average particle diameter to a particle diameter in terms of the specific surface area is not more than 10.
REFERENCES:
patent: 3979500 (1976-09-01), Sheppard et al.
patent: 4533645 (1985-08-01), Huseby et al.
patent: 4547471 (1985-10-01), Huseby et al.
patent: 4869925 (1989-09-01), Hiai et al.
patent: 4983462 (1991-01-01), Hiai et al.
patent: 5110575 (1992-05-01), Wakimura et al.
patent: 5178844 (1993-01-01), Carter et al.
patent: 5573742 (1996-11-01), Gebhardt
patent: 0 487 728 (1992-06-01), None
patent: 63-060102 (1988-03-01), None
patent: 06-015404 (1994-03-01), None
patent: 06-211577 (1994-08-01), None
patent: 177325 (1992-01-01), None
Ceramics Japan,(32), No. 6 (3 pp), no date.
Harada Isao
Haruta Kohichi
Hotta Yuji
Mitsuishi Kenshi
Qiu Jin-yu
Advanced Industrial Science and Technology
Buchanan & Ingersoll & Rooney PC
Langel Wayne A.
Mitsui Chemicals Inc.
LandOfFree
Aluminum nitride powder, method for producing the same and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Aluminum nitride powder, method for producing the same and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aluminum nitride powder, method for producing the same and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3783643