Super Low Temperature Sintering for PTCR Ceramics

Abstract

Abstract: Semiconducting BaTiO₃ and high-curie-point (Ba_0.4Pb_0.6)TiO₃ PTCR ceramics added with BN as a super low temperature sintering aid were investigated, and
the function of BN on the liquid-phase sintering of PTCR ceramics was studied. In comparison with AST and Si₃N₄, BN is a more effective additive that can
not only reduce the sintering temperature but also widen firing range. La-doped BaTiO₃ ceramics with BN addition can be obtained at 1100℃. The sintered
sample shows the PTC effect of 4.9 orders of magnitude and resistivity of 150Ω·cm. Nb-doped (Ba_0.4Pb_0.6)TiO₃ PTCR ceramics with the high Curie point
of 360℃, added with BN and AST, can be sintered at 1000℃. The super low temperature sintering for the PTCR ceramics has not been reported before.

Key words: BN, PTCR ceramics, super low temperature sintering

CLC Number:

TN304

TANG Xiao-Feng,CHEN Hai-Long,ZHOU Zhi-Gang. Super Low Temperature Sintering for PTCR Ceramics[J]. Journal of Inorganic Materials.

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Super Low Temperature Sintering for PTCR Ceramics

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