Metal matrix compositions for substrates used to make magnetic disks for hard disk drives
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United States of America Patent
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Jan 27, 1998
Grant Date -
N/A
app pub date -
Jul 1, 1996
filing date -
Jul 1, 1996
priority date (Note) -
Expired
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Abstract
A rigid disk substrate for a magnetic recording disk is formed of a boron carbide-metal matrix composite having a density ranging from 2.5 to 2.8 g/cm.sup.3 and a composition ranging from approximately 1 to 40 weight % of boron carbide and 60 to 99 weight % of metal matrix. The substrate has a thickness less than 1 mm and exhibits negligible resonance characteristics at rotation speeds ranging from 0 through 12,000 rpm. The metal matrix is aluminum or an aluminum alloy. The boron carbide includes metal elements added to improve the chelating properties of the metal matrix material by forming intermetallic bonds with the metal matrix material.
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