Compositions: ceramic – Ceramic compositions – Yttrium – lanthanide – actinide – or transactinide containing
Patent
1994-05-09
1995-12-19
Bonner, C. Melissa
Compositions: ceramic
Ceramic compositions
Yttrium, lanthanide, actinide, or transactinide containing
501127, 501153, 501134, 338 22R, 252521, 252518, 252 623T, C04B 3512
Patent
active
054768225
ABSTRACT:
A ceramic composition for thermistor exhibiting stable resistance values over a wide temperature range and capable of being used for a prolonged time. The composition is represented by (M.sup.1 M.sup.2 O.sub.3).sub.1-x .multidot.(M.sup.1 AlO.sub.3).sub.x, wherein M.sup.1 is an element selected from the elements of the group 3A of the International Periodic Table excluding La and M.sup.2 is an element of the groups 4A, 5A, 6A, 7A and 8 of the International Periodic Table, and wherein the mixing ratio between an electrically conductive substance stable at elevated temperatures and an insulating substance stable at elevated temperatures, may be adjusted. A thermistor formed of the composition is superior in high-temperature stability and can be used over a broad temperature range because its resistance value can be selected to an optimum value.
REFERENCES:
patent: 4156661 (1979-05-01), Brodmann et al.
patent: 4229322 (1980-10-01), Marchant et al.
patent: 4743881 (1988-05-01), Howng
Yano, K., "Fine Ceramic Handbook" published by Asakura Shoten, 1984.
Nakahara, K., "Automobile Combustion Control Sensors", vol. 30. No. 382 (1991), pp. 95-103.
Hayashi Kyohei
Iwaya Masaki
Matsuzaki Hiroshi
Suematsu Yoshirou
Bonner C. Melissa
NGK Spark Plug Co. Ltd.
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