Highly corrosion-resistant rare-earth-iron magnets

Details Highly corrosion-resistant rare-earth-iron magnets Highly corrosion-resistant rare-earth-iron magnets

1990-03-22

1992-10-13

Thibodeau, Paul J.

Stock material or miscellaneous articles

Composite

Of metal

4284111, 428457, 428692, 428900, 427129, B32B 1504

Patent

active

051549786

ABSTRACT:
A highly corrosion-resistant rare-earth-iron magnet has a paraxylylene polymer film or a chloropara-xylylene polymer film formed thereon. The substrate magnet surface has a roughness Ra of no more than one micron. The magnet has a plasma polymer film formed beforehand or afterwards. The plasma polymer film has a protective film consists of only carbon and hydrogen, with a refractive index decreasing from the boundary surface between the film and the magnet toward the exposed surface. The protective coating has a thickness about three times the surface roughness of the substrate magnet.

REFERENCES:
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patent: 4548864 (1985-10-01), Nakayama et al.
patent: 4693927 (1987-09-01), Nishikawa et al.
patent: 4711809 (1987-12-01), Nishikawa et al.
patent: 4749608 (1988-06-01), Nakayama et al.
patent: 4863805 (1989-09-01), Suzuki et al.
patent: 4889767 (1989-12-01), Yokoyama et al.
patent: 4892789 (1990-01-01), Nakayama et al.
Nichols et al., Evaluating the Adhesion Characteristics of Glow-Discharge Plasma Polymerized Films by a Novel Voltage Cycling Technique; Journal of Applied Polymer Science-Applied Polymer Symposium 38, 21-33 (1984).
Raschke et al., Polyparaxylylene Electrets Usable at High Temperatures,-Journal of Applied Polymer Science, vol. 25, 1639-1644 (1980).

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