Electrical conductor member such as a wire with an inorganic insulating coating
AssigneeSumitomo Electric Industries, Ltd.
InventorsKazuo Sawada, Shinji Inazawa, Kouichi Yamada
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Abstract
An insulated electrical conductor wire has a conductor core containing Ni or Ni alloy at least in its outer surface, an oxide layer of Ni or Ni alloy formed by oxidation treatment of the outer surface of the conductor, and an insulating inorganic compound outer layer formed on the oxide layer of Ni or Ni alloy. The insulating inorganic outer layer is intimately bonded to the oxide layer and provides an improved heat resistance and insulability.
Claims17
An insulated electrical conductor comprising a core conductor consisting essentially of a core material selected from the group consisting of Ni and Ni alloy, a first oxide layer consisting of an oxide of said core material formed on an outer surface of said core conductor by oxidizing said core conductor in a vapor phase containing oxygen, and a second oxide layer bonded to an outer surface of said first oxide layer, said second oxide layer consisting essentially of an inorganic insulating material selected from the group consisting of Al-oxide and Si-oxide and combinations thereof.
A method of forming an insulated electrical conductor, comprising:
- (a) preparing a core conductor of a core material selected from the group consisting of Ni and Ni alloy;
- (b) forming a first oxide layer on an outer surface of said core conductor by oxidizing said core conductor in a vapor phase containing oxygen;
- (c) preparing a coating solution by hydrolyzing and polycondensing an alkoxide of a member selected from the group consisting of Al, Si and combinations thereof in a solvent;
- (d) applying said coating solution onto said first oxide layer;
- (e) drying said coating solution for gelling the same;
- and
- (f) heating said coating solution applied onto said first oxide layer to form a second oxide layer on said first oxide layer.
Dependencies are inferred from the claim text.