Aluminium base-alloy for head drum of video cassette recorders

Details Aluminium base-alloy for head drum of video cassette recorders Aluminium base-alloy for head drum of video cassette recorders

1985-12-27

1988-04-26

Dean, R.

Metal treatment

Compositions

Heat treating

148 127A, 148417, C22F 104

Patent

active

047402504

ABSTRACT:
An aluminium-base alloy for head drum of video cassette recorders(VCR), which contains copper, magnesium, nickel, silicon, iron and Titanium+Boron and to which chromium is added optionally.
The proposed alloy is characterized in that thermal expansion coefficient is less than 20.0.times.10.sup.-6 /.degree.C., hardness after heat treatment is more than 145(Hv) and dispersion of precipitates smaller than 7.5 micron in size is more than 95%.

REFERENCES:
patent: 4431461 (1984-02-01), Hoshino et al.

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