| 摘要 |
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/cm3 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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