초록 ▼

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 thick

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.

대표청구항 ▼

[ What is claimed is:] [1.] A substrate for magnetic disk recording media, comprising:a boron carbide-metal matrix composite disk having a density ranging from about 2.5 to 2.8 g/cm.sup.3 and a composition ranging from about 1 to 40 weight % of boron carbide and about 60 to 99 weight % of metal matr

[ What is claimed is:] [1.] A substrate for magnetic disk recording media, comprising:a boron carbide-metal matrix composite disk having a density ranging from about 2.5 to 2.8 g/cm.sup.3 and a composition ranging from about 1 to 40 weight % of boron carbide and about 60 to 99 weight % of metal matrix, whereinthe metal matrix is comprised of aluminum or an aluminum alloy,the boron carbide-metal matrix composite disk has a thickness less than about 1 mm, andthe boron carbide-metal matrix composite is formed by a process that does not require melting of the aluminum or aluminum alloy metal matrix.