<p>The invention relates to a composite magnetic disk for magnetic recording, which consists of an annular core of polymeric material to which is bonded at least one disk of reaction-bonded silicon carbide with a magnetic recording layer on its outer surface. After its processing, the SiSiC disk surface shows optimum planarity and smoothness so that it can be used as a magnetic disk substrate. Furthermore, the material has a low density and an extremely high specific modulus of elasticity so that numbers of revolution higher than obtainable with formerly known AlMg5 disk substrates can be reached.</p>
申请公布号
EP0126790(B1)
申请公布日期
1986.09.03
申请号
EP19830105262
申请日期
1983.05.27
申请人
IBM DEUTSCHLAND GMBH;INTERNATIONAL BUSINESS MACHINES CORPORATION
发明人
BAYER, THOMAS;HINKEL, HOLGER, DR. DIPL.-PHYS.;KLEISCHMANN, KURT;KUNZEL, ULRICH, DR. DIPL.-CHEM.;SCHAFER, ROLF, DR. DIPL.-MIN.