Plastic and nonmetallic article shaping or treating: processes – Including step of generating heat by friction
Patent
1988-11-21
1990-10-02
Derrington, James
Plastic and nonmetallic article shaping or treating: processes
Including step of generating heat by friction
501 96, 501138, C04B 3546
Patent
active
049605518
ABSTRACT:
A modified lead barium titanate ceramic which has a fundamental composition of (Ba.sub.1-x-y Sb.sub.y Pb.sub.x)TiO.sub.3, where x is not greater than 0.9 and usually not smaller than 0.6 and y is from 0.001 to 0.1, and has a high positive temperature coefficient of resistivity (PTCR) over a range of temperature higher than about 350.degree. C. at the lower boundary, is produced by using a metal salt of an organic acid such as lead titanate salt of oxalic acid as the source of Pb and by adding at least one of BaCO.sub.3, SiO.sub.2, BN and TiO.sub.2 to the raw materials of the above fundamental composition. After thermally decomposing the organic acid metal salt the mixture of the raw materials including the additive(s) is compacted and sintered. By this method the sintering is achieved with good reproducibility and with little dissipation of lead, and the obtained titanate ceramic is good and durable in the PTCR characteristics and hence is useful as the material of a PTC thermistor functioning at medium-to-high temperatures.
Eonomoto Takamitsu
Kawahara Midori
Murata Noboru
Okada Naoki
Ueda Hiroshi
Central Glass Company Limited
Derrington James
LandOfFree
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