Coating processes – Direct application of electrical – magnetic – wave – or... – Pretreatment of substrate or post-treatment of coated substrate
Patent
1997-01-07
1998-01-06
Pianalto, Bernard
Coating processes
Direct application of electrical, magnetic, wave, or...
Pretreatment of substrate or post-treatment of coated substrate
427130, 427131, 427132, 427404, 427580, 428 653, H05H 132
Patent
active
057052344
ABSTRACT:
An object of the present invention is to provide a method for manufacturing a magnetic hard disk wherein a magnetic material layer adhered on a surface of a substrate of the magnetic hard disk has a flat surface.
A method for manufacturing a magnetic hard disk comprising steps of: structurally transforming a surface of an amorphous Ni--P alloy film layer formed a substrate (10) of the magnetic hard disk; and adhering a magnetic material layer on the surface of a substrate (10), wherein the step of structurally transforming the a-Ni--P alloy film layer is a step of heating only a desired portion of the surface of the substrate (10) by an electric discharge to generate Ni and crystallized compounds of Ni and P only at the desired portion (T) of the surface thereof. The electric discharge in the step of structurally transforming the a-Ni--P alloy film layer is carried out by applying a discharge potential between at least one electric discharger (11) and a metallic table (12) as an electrode which carries the substrate (10) thereon, the electric discharger (11) being positioned in opposite to the surface of the substrate (10).
REFERENCES:
"Process of Structural Transformation of Electrodeposited Amorphous Ni-P Alloy by Heating", M. Yamamoto, et al., J. of Electrochemical Soc., vol. 138, No. 7, Jul., 1991.
Nakamura Noriko
Yamamoto Motokazu
Nihon Micro Coating Co., Ltd.
Pianalto Bernard
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