Sintered compact for thermistor element, process for producing the same, thermistor element and temperature sensor
AssigneeNgk Spark Plug Co., Ltd.
InventorsTakaaki Chosokabe, Masaki Iwaya, Naoki Yamada, Wakato Takano
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Abstract
A sintered body for thermistor element of the invention is a sintered body for thermistor element containing Sr, Y, Mn, Al, Fe, and O, wherein not only respective liquid crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a liquid crystal phase of at least one of an Sr—Al based oxide and an Sr—Fe based oxide. FeYO3 and/or AlYO3 is selected as the foregoing perovskite type oxide, and at least one member selected from Y3Al5O12, Al2Fe3Y3O12, and Al3Fe2Y3O12 is selected as the foregoing garnet type oxide, respectively by the powder X-ray diffraction analysis.
Claims12
A sintered body for thermistor elements containing Sr, Y, Mn, Al, Fe, and O, which is characterized in that not only crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a crystal phase of of an Sr—Al based oxide or an Sr—Fe based oxide or both is contained.
A process for producing a sintered body for thermistor elements, which is characterized by mixing respective raw material powders containing elemental Sr, Y, Mn, Al, and Fe and calcining the mixture to form a calcined powder;
- subsequently molding a thermistor forming powder comprising a mixture of this calcined powder with a sintering assistant containing at least elemental Si;
- and then calcining the resulting molded compact to obtain a sintered body for thermistor element containing not only crystal phases of a perovskite type oxide and a garnet type oxide but also a crystal phase of an Sr—Al based oxide or an Sr—Fe based oxide or both.
A process for producing a sintered body for thermistor elements, which is characterized by mixing respective raw material powders substantially free from elemental Si and containing elemental Sr, Y, Mn, Al, and Fe, and calcining the mixture to form a calcined powder;
- subsequently molding the thermistor forming powder obtained by pulverizing this calcined powder;
- and then calcining the resulting molded compact to obtain a sintered body for thermistor elements containing not only crystal phases of a perovskite type oxide and a garnet type oxide but also a crystal phase of an Sr—Al based oxide or an Sr—Fe based oxide or both, and substantially free from Si.
A thermistor element, which is characterized by using a sintered body for thermistor elements containing Sr, Y, Mn, Al, Fe, and O, wherein not only crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a crystal phase of an Sr—Al based oxide or an Sr—Fe based oxide or both is contained.
A temperature sensor, which is characterized by using a sintered body for thermistor elements containing Sr, Y, Mn, Al, Fe, and O, wherein not only respective crystal phases of a perovskite type oxide and a garnet type oxide are contained, but also a crystal phase of an Sr—Al based oxide or an Sr—Fe based oxide or both is contained.
Dependencies are inferred from the claim text.