A high curie temperature ptc thermosensitive ceramic material

Abstract

The invention relates to the technical field of inorganic non-metallic materials, especially a thermal sensitive ceramic material with Curie temperature. The material is characterized by comprising the following ingredients by molar percentage: 92-99% of Ba0.398Pb0.6La0.002TiO3, 0.1-4.0% of BN, 0.01-2.8% of Bi2O3, 0.01-1.5% of MnCO3, 0.5-2% of CaTiSiO5, 0.01-2.5% of SiO2, and 0.02-1.5% of LaCrZrSiO7. Ba0.398Pb0.6La0.002TiO3, CaTiSiO5 and LaCrZrSiO7 are synthesized from conventional chemical materials by a solid phase method. The thermal sensitive ceramic material with Curie temperature has low sintering temperature, high Curie temperature and good PTC temperature-sensitive performance.

Description

technical field [0001] The present invention relates to the technical field of inorganic non-metallic materials, in particular to the formula composition of high Curie temperature PTC thermosensitive ceramics; a special formula composition is adopted to obtain high Curie temperature and high-performance PTC thermosensitive ceramic materials, and the sintering temperature is 1050-1100°C; The high Curie temperature PTC heat-sensitive ceramic material of the present invention not only has a low sintering temperature but also has a high Curie temperature, and at the same time has good heat-sensitive performance, which suppresses the volatilization of lead in the manufacturing process of the high Curie temperature PTC heat-sensitive ceramics, meets environmental protection requirements, and at the same time Reduce manufacturing costs. Background technique [0002] PTC ceramic is a semiconducting electronic ceramic material with a positive temperature coefficient (Positive Tempera...

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Problems solved by technology

[0003] The most commonly used PTC thermosensitive ceramic is BaTiO 3 The Curie temperature of base ceramic materials is 120°C; in order to increase the working temperature of heat-sensitive ceramics, it is realized by adding lead oxide or lead-containing compounds as the Curie temperature moving agent and replacing the lattice position of Ba with Pb. The product is (Ba, Pb) TiO with high lead content 3 system; lead is a toxic heavy metal element, in (Ba, Pb)TiO 3 In the production process of heat-sensitive ceramics, lead will cause pollution to the natural environment and cause harm to human health; the development of lead-free high Curie point PTC heat-sensitive ceramics is a way to eliminate lead pollution, but lead-free high Curie point The performance of PTC thermosensitive ceramics is not ideal, it is difficult to meet the application, and the preparation process is complicated, the cost is high, the sintering temperature of the existing PTC thermosensitive ceramics is high, which is above 1300 ° C, if the sintering of high Curie temperature PTC thermosensitive ceramics is reduced temperature, it will inhibit the volatilization of lead oxide, and it is also another effective way to eliminate lead pollution; at present, the development of my country's PTC thermal ceramic industry is facing serious tests and challenges, low sintering temperature high Curie temperature PTC thermal The development of ceramic materials has become an imminent subject

[0004] In recent years, many researchers and production workers at home and abroad have embarked on the development and research of PTC heat-sensitive ceramic materials with low-temperature sintering and high Curie temperature (Curie temperature greater than 120°C). High, but the comprehensive thermal performance is not very good; the Curie temperature of some PTC thermal ceramic materials is too low, both of which cannot meet the practical application

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