Method of using aluminum alloy as substrate for magnetic discs w

Details Method of using aluminum alloy as substrate for magnetic discs w Method of using aluminum alloy as substrate for magnetic discs w

1986-07-07

1989-05-02

Andrews, Melvyn J.

Stock material or miscellaneous articles

All metal or with adjacent metals

Composite; i.e., plural, adjacent, spatially distinct metal...

148 2, 148 115A, 148 315, 428654, C22F 104

Patent

active

048267376

ABSTRACT:
A substrate for a magnetic disc prepared from an aluminum alloy which consists essentially of from 3.0 to 5.0 percent, preferably from 3.5 to 4.5 percent, Mg, from 0.5 to 3.0 percent, preferably from 0.5 to 1.7 percent, Zn, and the balance Al and inevitable impurities. The inevitable impurities contain not more than 0.10 percent Si, not more than 0.10 percent Fe, not more than 0.01 percent, Mn, not more than 0.01 percent Cr, not more than 0.01 percent Ni, and not more than 0.01 percent Ti.
The aluminum alloy substrate may also contain from 0.3 to 2.0 percent, preferably from 0.5 to 1.0 percent, Cu, and/or from 0.02 to 0.5 percent, preferably from 0.05 to 0.2 percent, Zr.
The aluminum alloy substrate for a magnetic disc has a structure wherein fine and uniform intermetallic compounds are present in the matrix metal, with almost no non-metallic inclusions present therein, and which has high hardness and high strength, thereby making it possible to provide a magnetic disc (1) having improved surface smoothness and (2) of reduced thickness. The disc substrate can be coated to provide high density magnetic recording.

REFERENCES:
patent: 2245167 (1941-06-01), Stroup
patent: 4412870 (1983-11-01), Vernam et al.
patent: 4431461 (1984-02-01), Hoshino et al.

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