Patent · US Expired

Composite magnetic disk with Si and SiC substrate

US4598017A · kind A · utility

22Cited by

6References

7Claims

0Family size

Assignee

International Business Machines Corporation · US

Inventors

Thomas Bayer · Igersheim, DE
Holger Hinkel · Böblingen, DE
Kurt Kleischmann · Wildberg, DE
Ulrich Kuenzel · Tübingen, DE
Rolf Schafer

Key dates

Filing date	May 22, 1984
Grant date	Jul 1, 1986
Priority date	—
Expiry date	May 22, 2004

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/31533
WIPO fieldAudio-visual technology
WIPO sectorElectrical engineering

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.