Aluminum nitride powder and a process for the preparation thereo

Details Aluminum nitride powder and a process for the preparation thereo Aluminum nitride powder and a process for the preparation thereo

1989-06-09

1990-05-08

Doll, John

Chemistry of inorganic compounds

Nitrogen or compound thereof

Binary compound

C01B 21072

Patent

active

049236911

ABSTRACT:
An aluminum nitride powder has a crystallite size of 40 to 150 nm, measured by powder diffractometry and evaluated by the method of Scherrer, a primary particle size of 0.1 to 0.5 .mu.m, a specific surface according to BET of 5 to 50 m.sup.2 /g and a degree of whiteness of more than 91%, measured using light of a 400 to 700 nm wavelength against barium sulfate analytical reagent as standard of whitness.
To prepare this aluminum nitride powder, metallic aluminum and monoamminealuminum chloride [AlCl.sub.3 (NH.sub.3)] are first molten together in an inert gas atmosphere at temperatures above 125.degree. C. and allowed to react with one another with evolution of hydrogen. 8 to 20 g of ammonia are then introduced per hour per mol of monoamminealuminum chloride into the aluminum-containing monoamminealuminum chloride melt at temperatures between 250.degree. and 400.degree. C., aluminum nitride being precipitated as a solid until the conversion of the aluminum is complete. The temperature of the melt is finally raised to more than 400.degree. C.

REFERENCES:
patent: 4610857 (1986-09-01), Ogawa et al.
patent: 4612045 (1986-09-01), Shintaku
patent: 4680278 (1987-07-01), Inoue et al.
F. F. Grekov et al., J. Applied Chemistry(Moscow) 2:249-254 (1988).

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