Process for producing small particles of aluminum nitride and pa

Details Process for producing small particles of aluminum nitride and pa Process for producing small particles of aluminum nitride and pa

1992-10-02

1993-09-21

Langel, Wayne

Chemistry of inorganic compounds

Nitrogen or compound thereof

Binary compound

501 96, C01B 21072

Patent

active

052466833

ABSTRACT:
A process for producing small particles of aluminum nitride suitable for sintering and the particles thus-produced. The process comprises reacting particles of gamma alumina, or a precursor thereof, of less than 1 micron in size with a stoichiometrical excess of finely divided carbon in the presence of nitrogen, or a precursor which provides nitrogen in the reaction conditions, first at a temperature in the range of 1550.degree. to 1700.degree. C. for a period of between 1 and 6 (preferably 1 to 4) hours and then at a temperature in the range of 1750.degree. to 1850.degree. C. for a period of 1 to 4 (preferably 1 to 2) hours, followed by cooling said reaction mixture and reheating to a temperature in the range of 500.degree. to 700.degree. C. in an oxygen-containing atmosphere, and maintaining the temperature until excess unreacted carbon is removed. The alumina or precursor preferably has a particle size of less than 400 nm and the carbon source preferably contains iron as an impurity, and is preferably petroleum coke. The AlN product is particularly suited for use in forming a substrate for electronic components by a process involving sintering of the AlN particles because of the small size (less than 2 microns) and narrow size distribution of the particles.

REFERENCES:
patent: 4618592 (1986-10-01), Kuramoto et al.
patent: 5049367 (1991-09-01), Nakano et al.
patent: 5087592 (1992-02-01), Nadkarni
patent: 5096860 (1992-03-01), Nadkarni
patent: 5114695 (1992-05-01), Jain et al.
patent: 5116679 (1992-05-01), Nadkarni et al.

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