Page 43 - 机械工程材料2025年第三期

莫志伟，等：烧结温度和铌、锰掺杂量对钛酸铅钡基高居里点PTC陶瓷阻温特性的影响

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［23］ JONKER G H. Some aspects of semiconducting barium Inorganic Materials，2009，24（2）：374-378.

titanate［J］. Solid-State Electronics，1964，7（12）：895- ［25］ LIU J Q，JIN G H，CHEN Y Z，et al. Properties of

903. yttrium-doped barium titanate ceramics with positive
［24］ 李燕燕， 李国荣，王天宝，等. Nb 2 O 5 掺杂高温无铅（Ba， temperature coefficient of resistivity and a novel method

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LI Y Y，LI G R，WANG T B，et al. Effects of niobium-

Effect of Sintering Temperature and Nb, Mn Doping Amount on Temperature
Resistance Characteristics of Lead Barium Titanate Based High

Curie Point PTC Ceramics

MO Zhiwei , WANG Huanping , LI Denghao , LIN Xiaojie , MA Hongping , GAO Zhao ,
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2
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3
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JIANG Zongheng , XU Shiqing 1
1
(1. Institute of Optoelectronic Materials and Devices, China Jiliang University, Hangzhou 310018, China; 2. Haining Yongli
Electronic Ceramics Co., Ltd., Haining 314415, China; 3. School of Mechanical and Energy Engineering,
Zhejiang University of Science and Technology, Hangzhou 310023, China)
Abstract: The Nb-Mn Co-doped lead barium titanate based high Curie point positive temperature coefficient
(PTC) ceramics were prepared by solid state reaction after adding lead, strontium, calcium, niobium and manganese
into barium titanate ceramics. The effects of the composite doping of Nb and Mn (molar fraction of 0.002 0‒0.003 0,
0.000 8‒0.002 5, respectively) on the microstructure, bulk density and temperature resistance characteristics of the
ceramics under different sintering temperatures (125 0‒131 0 ℃) were studied. The results show that the bulk densities of
ceramics doped with different molar fractions of Mn or Nb first increased and then decreased with the increase of sintering
temperature. When the sintering temperature was 1 290 ℃, the bulk densities were the largest, and their structures were
all pure chalcocite structures. When the sintering temperature was 1 290 ℃, with the increase of Mn doping amount, the
bulk density of the ceramics first increased and then decreased, the grain size increased, the room temperature resistivity
increased, the lift-off resistance ratio and the temperature coefficient basically first increased and then decreased, and the
Curie temperature was stabilized at 271‒280 ℃. With the increase of Nb doping amount, the bulk density of the ceramics
first increased and then decreased, the grain size decreased, the lift-off resistance ratio and temperature coefficient
first increased and then decreased, the room temperature resistivity first decreased and then increased, and the Curie
temperature was stabilized at 270‒281 ℃. When the sintering temperature was 1 290 ℃, the molar fractions of doped Mn
and Nb were 0.001 0, 0.002 4, respectively, the temperature resistance characteristics of the ceramics were the best; the
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lift-off resistance ratio and temperature coefficient were the largest, which were 7.011×10 and 20.19%, respectively,
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the room-temperature resistivity was 2.13×10 Ω · cm, and the Curie temperature was 281 ℃. The excellent temperature
resistance was ascribed to the uniform the grain size and the largest bulk density.
Key words: lead barium titanate based PTC ceramic; Nb-Mn co-doping; high Curie point; temperature resistance
characteristic

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