Abrasive tool making process – material – or composition – With inorganic material – Metal or metal oxide
Patent
1993-03-05
1995-10-10
Jones, Deborah
Abrasive tool making process, material, or composition
With inorganic material
Metal or metal oxide
29603, 106 3, 451548, 451550, 451905, 216 88, C09K 168
Patent
active
054567360
ABSTRACT:
This invention provides a lap capable of reducing the pole recession produced between the substrate and the magnetic film when the air-bearing surface of a thin-film magnetic head is lapped, a lapping liquor used for such lapping, and a thin-film magnetic head having its air-bearing surface lapped by using them. Lapping is carried out by using a lap made of a material having both a phase of tin and a phase of brass with a greater rigidity in supporting the abrasive grains than tin, and a lapping liquor prepared by mixing an anionic surfactant (15) and an ampholytic surfactant (16). According to the present invention, it is possible to reduce the pole recession in the thin-film magnetic heads and to accordingly shorten the recording bit length of the magnetic discs.
REFERENCES:
patent: 4010583 (1977-03-01), Highberg
patent: 4762534 (1988-08-01), Ito et al.
patent: 4842618 (1989-06-01), Ito et al.
patent: 4980995 (1991-01-01), Smith
patent: 5028242 (1991-07-01), Ito et al.
patent: 5083365 (1992-01-01), Matsumoto
Foundation of Interfacial Phenomena, p. 94, lines 9-19 (published by Asakura Shoten, 1973).
Aikawa Shigeo
Fujisawa Masayasu
Isono Yukihiro
Ohashi Kenya
Waki Yoshiharu
Hitachi , Ltd.
Jones Deborah
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