Powder metal process for preparing computer disk substrates

Details Powder metal process for preparing computer disk substrates Powder metal process for preparing computer disk substrates

1984-05-11

1986-02-11

Lieberman, Allan M.

Powder metallurgy processes

Powder metallurgy processes with heating or sintering

Powder shape or size characteristics

419 36, 419 42, 419 43, 419 46, 419 32, 360135, B22F 316

Patent

active

045698228

ABSTRACT:
A method is provided for preparing computer disk substrates having low surface amplitude which comprises: (a) forming a liquid suspension containing aluminum powder, an aluminum alloying element and a borate composition by initially admixing the borate composition with a volatile liquid medium to obtain a borate solution and thereafter admixing the aluminum powder and aluminum alloying element with the borate solution to produce the liquid suspension; (b) heating the liquid suspension to remove the liquid medium and to obtain a dry aluminum powder composition; (c) isostatically pressurizing the dry aluminum powder composition and roller compacting the same into sheet form; (d) heating and sintering the sheet form in a non-oxidizing atmosphere; and (e) cutting and compressing the sintered sheet into computer disk substrate configuration.

REFERENCES:
patent: 4430387 (1984-02-01), Nakagawa et al.

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