无机材料学报

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PTCR陶瓷材料的超低温烧结

唐小锋; 陈海龙; 周志刚   

  1. 清华大学材料科学与工程系新型陶瓷与精细工艺国家重点实验室, 北京 100084
  • 收稿日期:1999-08-09 修回日期:1999-09-20 出版日期:2000-08-20 网络出版日期:2000-08-20

Super Low Temperature Sintering for PTCR Ceramics

TANG Xiao-Feng; CHEN Hai-Long; ZHOU Zhi-Gang   

  1. State Key Laboratory of New Ceramics and Fine Processing; Department of Materials Science and Engineering; Tsinghua University; Beijing 100084; China
  • Received:1999-08-09 Revised:1999-09-20 Published:2000-08-20 Online:2000-08-20

摘要: 主要研究了BN对PTCR陶瓷材料低温烧结的作用.对La掺杂BaTiOPTCR陶瓷,在1100℃的低温下烧结可以得到室温电阻率为150Ω·cm、升阻比为4.9个数量级的样品.对居里温度为360℃的高居里点(Ba0.4Pb0.6)TiO PTCR陶瓷材料,选用 Nb为半导化剂,BN和AST为助烧剂时,可以在1000℃左右的超低温下烧成.同时,对BN助烧剂的液相烧结机制进行了初步的探讨.

关键词: BN, PTCR陶瓷, 超低温烧结

Abstract: Semiconducting BaTiO3 and high-curie-point (Ba0.4Pb0.6)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 (Ba0.4Pb0.6)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

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