Alumina glass composition and magnetic head incorporating same

Details Alumina glass composition and magnetic head incorporating same Alumina glass composition and magnetic head incorporating same

1983-10-20

1985-10-01

Metz, Andrew H.

Dynamic magnetic information storage or retrieval

Head

Core

29603, 501 45, 501 47, 501 48, 501 73, 501 77, 501 79, G11B 5251, C03C 316

Patent

active

045449740

ABSTRACT:
There are described a glass composition and a magnetic head containing the same, wherein the glass composition comprises an oxide of an alkali metal or alkaline earth, and at least one non-alkali metal oxide in an amount sufficient to provide a coefficient of thermal expansion of 80-170.times.10.sup.-7 .degree. C..sup.-1, the composition featuring from 5-15 mole % Al.sub.2 O.sub.3 and an amount of a compatible glass former sufficient to insure the Al.sub.2 O.sub.3 is soluble in the composition.

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Fedrowitz et al., IBM Technical Disclosure Bulletin, vol. 9, No. 11, Apr. 1967, p. 1475.
Hoogendoorn et al., IBM Technical Disclosure Bulletin, vol. 11, No. 9, Feb. 1969, p. 1179.
Physicochemical Properties of Aluminophosphate Glass, by Syritskaya.
Yamada et al., "Thermal Properties of New Metaphosphate Glasses", 41, RCA Review, pp. 120-126, (1980).
Klein et al., "Glass Formation and Properties in the Aluminum Borophosphate System", 57, Ceramic Bulletin, pp. 199-215, (1978).
J. of Non-Crystalline Solids, 38 & 39, pp. 879-884.

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