Glass-ceramic substrate for a magnetic head and a method for man

Details Glass-ceramic substrate for a magnetic head and a method for man Glass-ceramic substrate for a magnetic head and a method for man

1999-03-11

2000-03-07

Group, Karl

Compositions: ceramic

Ceramic compositions

Devitrified glass-ceramics

501 5, 501 63, 501 69, 501 72, 65 338, 216 89, C03C 1004, C03C 1014

Patent

active

060340118

ABSTRACT:
A glass-ceramic substrate for a magnetic head has as its predominant crystal phase a mixed crystal of lithium disilicate (Li.sub.2 O.2SiO.sub.2) and either or both of .alpha.-quartz (.alpha.-SiO.sub.2) and .alpha.-cristobalite (.alpha.-SiO.sub.2), the .alpha.-quartz has a globular grain structure each globular crystral grain being made of aggregated particles and having a grain diameter within a range from 0.1 .mu.m to 3.0 .mu.m, the .alpha.-cristobalite has a globular grain structure each globular grain having a grain diamter within a range from 0.1 .mu.m to 1.0 .mu.m, and surface roughness (Ra) of the glass-ceramic substrate after polishing is within a range from 5 .ANG. to 50 .ANG..

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