.theta.-alumina powder, preparation thereof and magnetic recordi

Details .theta.-alumina powder, preparation thereof and magnetic recordi .theta.-alumina powder, preparation thereof and magnetic recordi

1993-10-14

1994-09-20

Group, Karl

Compositions: ceramic

Ceramic compositions

Aluminum compound containing

501127, 51309, 423625, 423629, C04B 3510

Patent

active

053489209

ABSTRACT:
Alumina powder having a .theta.-alumina content of at least 70% by weight and an average primary particle size at least 0.1 .mu.m and containing a tungsten compound in an amount of 0.1 to 5% by weight in terms of tungsten oxide based on alumina can be used as an abrasive for a magnetic recording medium having good properties.

REFERENCES:
patent: 3714343 (1973-01-01), Sato et al.
patent: 4731278 (1988-03-01), Ryoke et al.
Chemical Abstracts, vol. 84, 1976, Columbus, Ohio, US; Abstract No. 19875v (no month).
Chemical Abstracts, vol. 73, 1970, Columbus, Ohio, US; Abstract No. 102725q (no month).
Chemical Abstracts, vol. 82, Mar. 24, 1975, Columbus, Ohio, US; Abstract No. 75042s.
Electrochemistry, 28, 302-312 and 358-364 (1960) (with partial translation) (no month).
Jounral of Mineralogy, 19, (1), 21 (1989) (no month).
Scientific Articles of Japan Ceramics Society, 99, (7) 550-555, 1991, received Nov. 5, 1990.

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