Compositions: ceramic – Ceramic compositions – Titanate – zirconate – stannate – niobate – or tantalate or...
Patent
1994-11-21
1997-03-11
Brunsman, David
Compositions: ceramic
Ceramic compositions
Titanate, zirconate, stannate, niobate, or tantalate or...
252 623T, 338 22R, 422 8212, C04B 3542, C04B 35505
Patent
active
056101112
ABSTRACT:
Ceramic composition for thermistor for detecting elevated temperatures which exhibits stable properties at elevated temperatures for permitting use in both oxidizing and reducing atmospheres. In a YCrO.sub.3 based material, Sr or Sm is partly or completely substituted for Y, and Fe and Ti are substituted for part of Cr. Such material enables the production of a thermistor element exhibiting practical, low resistance values at 300.degree. to 1100.degree. C. and also exhibiting stability against changes in the environmental conditions or thermal hysteresis. Generally AMO.sub.3 perovskite structure (A=2A,3A,3B subgroup elements, M=4A,5A,6A,8 subgroup elements) having a combination of n-type and p-type components provides the same property, the subgroup being of IUPAC international periodic table. La-free is preferred and sintering aid may be used.
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Patent Abstracts of Japan, vol. 16, No. 420 (E-1259), 4 Sep. 1992 and JP-A-04 144201 (Shinagawa Refract Co Ltd) 18 May 1992, abstract only.
Hayashi Kyohei
Iwaya Masaki
Brunsman David
NGK Spark Plug Co. Ltd.
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