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US 5,279,886 AGranted
Alumina sintered body
AssigneeNgk Spark Plug Co., Ltd.
InventorsTakeshi Kawai, Nobuhiro Hayakawa, Harumi Aiba
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AssigneeNgk Spark Plug Co., Ltd.
InventorsTakeshi Kawai, Nobuhiro Hayakawa, Harumi Aiba
Estimating the term…
The present invention provides an improved alumina sintered body on which a heater electrode is printed and which is sintered simultaneously with the heater electrode at temperatures lower than the optimum value 1,520.degree. C. The alumina sintered body includes high purity of alumina and 2 through 18% by weight partially stabilized zirconia, which further contains 2 through 6 mole percent solid solution of an oxide or oxides selected from Y.sub.2 O.sub.3, Sc.sub.2 O.sub.3, and lanthanum series metal oxides. The high purity of alumina may contain 0.1% by weight alkaline metals and/or alkaline earth metals and 1.0% by weight SiO.sub.2 at most. In the alumina sintered body of the invention, segregation and migration of impurities and chipping are effectively prevented and hence the durability of the sintered body is highly improved. Use of the alumina sintered body of the invention as a heater base makes the durability of a heater much longer.
An alumina sintered body having a heater electrode printed and sintered thereon comprising:
An alumina sintered body having a heater electrode printed and sintered thereon comprising:
A method for producing an alumina sintered body having a heater electrode formed thereon comprising the steps of:
The method of manufacturing an alumina sintered body comprising a base of a heater element for a sensor comprising the steps of:
Dependencies are inferred from the claim text.