Crystallized glass substrate for information recording medium and method of producing the same
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United States of America Patent
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Oct 9, 2012
Grant Date -
Jun 9, 2011
app pub date -
Jun 2, 2010
filing date -
Jun 4, 2009
priority date (Note) -
Expired
status (Latency Note)
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Abstract
To provide a substrate for information recording medium having various properties, in particular higher fracture toughness, required for application of the substrate for information recording medium of the next generation such as perpendicular magnetic recording system, etc. and a material with excellent workability for such purpose. A crystallized glass substrate for information recording medium, consisting of a crystallized glass which comprises one or more selected from RAl2O4 and R2TiO4 as a main crystal phase, in which R is one or more selected from Zn, Mg and Fe, and in which the main crystal phase has a crystal grain size in a range of from 0.5 nm to 20 nm, a degree of crystallinity of 15% or less, and a specific gravity of 3.00 or less.
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