Insulated electrical conductor wire having a high operating temperature
AssigneeSumitomo Electric Industries, Ltd.
InventorsKazuo Sawada, Shinji Inazawa, Kouichi Yamada
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Abstract
An insulated wire has a conductor, a first insulating metal oxide layer which is formed around the conductor, and a second insulating metal oxide layer, containing ceramic particles mixed by addition and formed around the first insulating metal oxide layer. The so formed insulating metal oxide layers are produced by changing a precursor of a metal oxide into the ceramic state. This change is caused by a method such as a sol-gel method or a thermal decomposition method. The mixed ceramic particles are more preferably in the form of fine platelets. This insulated wire has an excellent flexibility, emits no gas, can maintain its insulation even at a high temperature, and has a high breakdown voltage.
Claims15
An insulated electrical conductor wire for use under high temperature operating conditions of at least 600.degree. C., comprising an electrical conductor core having a clean surface, said electrical conductor core having a first melting point within the range of up to 1500.degree. C., a first electrically insulating ceramic layer having a thickness of 1 to 10 .mu.m bonded to said clean surface of said conductor core, said first electrically insulating ceramic layer having a second melting point higher than said first melting point of said electrical conductor core, and a second electrically insulating ceramic layer bonded to said first electrically insulating ceramic layer, said second electrically insulating ceramic layer comprising a ceramic matrix and ceramic particles uniformly dispersed and embedded in said ceramic matrix, said second ceramic layer having a third melting point also higher than said first melting point of said electrical conductor core.
Dependencies are inferred from the claim text.