WERKWIJZE VOOR HET VERBETEREN VAN DE OPPERVLAKTE-EIGENSCHAPPEN VAN EEN FERRIET BEKLEED MET EEN LAAG VAN POLYMEER, ALSMEDE BEKLEED FERRIET DAT VOLGENS DEZE WERKWIJZE IS BEHANDELD.

摘要

1,242,630. Coated ferrite bodies. FERROXCUBE CORP. OF AMERICA. 23 Dec., 1969 [26 Dec., 1968], No. 62616/69. Heading H1H. A ferrite body coated with poly(chloro-pxylylene) is heated to 280‹ to 350‹ C. and is maintained at that temperature for 3 to 25 minutes. The adhesion and smoothness of the coating is thereby improved, and the colour of the coated bodies is changed from grey to dark green or black. In examples, coated linear ferrite toroids are heated at temperatures of 300‹ or 350‹ C. for periods of 3-20 minutes. The coatings of poly(chloro: - pxylylene) are 0À25- 1À0 mil. thick. The heating is effected in air in a muffle furnace in which the toroids are supported on a wire mesh screen.