Heat sensitive resistor for high Curie temperature BaTiO3 base positive temperature coefficient and its making method

A technology of positive temperature coefficient and thermistor, applied in the direction of resistors with positive temperature coefficient, etc., can solve the problems of lead environmental pollution and achieve the effect of simplifying the process

Inactive Publication Date: 2008-05-28
TIANJIN UNIV
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Problems solved by technology

[0002] Currently BaTiO with a Curie temperature higher than 120°C 3 Based on a positive temperature coefficient thermistor, its material composition introduces lead as a mobile agent (Zhou Dongxiang et al., Semiconductor Ceramics and Applications, Huazhong University of Science and Technology Press, p90), this high-temperature PTCR material will Lead pollution to the environment

Method used

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Embodiment Construction

[0020] Weigh 0.916molBaCO with a one-thousandth balance according to the molar ratio of the formula 3 , 0.08molSrCO 3 , 1molTiO 2 The molar mass, and then weighed 0.002molBi with a ten-thousandth balance 2 o 3 , 0.002molNa 2 CO 3 , 0.0011molNb 2 o 5 and 0.0006molSb 2 o 3 The molar mass of the ingredients was wet ball milled for 12 hours according to the mass ratio of ingredients: grinding balls: deionized water = 1: 1: 2. The mixed and ground slurry was dried in an oven at 120°C. Then the dried material was pre-synthesized at 1050°C for 2 hours. According to the molar ratio of the formula, add 0.0004molMnO into the pre-synthesized material with a balance with an accuracy of one ten thousandth 2 , 0.005molSiO 2 , 0.0017molAl 2 o 3 , 0.01molTiO 2 The molar mass of the molar mass was carried out by wet ball milling for 24 hours with the mass ratio of ingredients: grinding balls: deionized water=1:1:2. The ball grinding material is dried at 120°C, and 5% polyvinyl ...

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Abstract

The invention relates to a BaTiO3 group positive temperature coefficient thermistance and a preparation method thereof, wherein, the BaTiO3 group positive temperature coefficient thermistance has high Curie temperature. The invention belongs to the electronic ceramics technique. The recombination positive temperature coefficient thermistance is composed of main materials and assistant materials. The mol ratio of TiO2 and (BaCO3+SrCO3+Bi2O3+Na2CO3) of the main materials is 1:1. The mol components of the assistant materials are that Nb2O5 is 0.0011; TiO2 is 0.01; Sb2O3 is 0.0006; MnO2 is 0.0004; SiO2is 0.005; Al2O3 is 0.0017. The preparation process comprises that materials are weighed and mixed according to the mol prescription; the mixed materials are processed with ball milling after being added with water, and preparative complex materials are made through drying and heat preservation. The preparative complex materials are again added with raw materials, and then the preparative complex materials are processed with ball milling after being added with the water, thus the positive temperature coefficient thermistance is made through drying, granulation, foliation and baking. The invention has the advantages that the process of the composite (Na0.5Bi0.5)TiO3 is simple; the made positive temperature coefficient thermistance is unleaded and environment-friendly.

Description

technical field [0001] The invention relates to a high Curie temperature BaTiO 3 The invention discloses a positive temperature coefficient thermistor and a preparation method thereof, which belong to the technology of electronic ceramics. Background technique [0002] Currently BaTiO with a Curie temperature higher than 120°C 3 Based on a positive temperature coefficient thermistor, its material composition introduces lead as a mobile agent (Zhou Dongxiang et al., Semiconductor Ceramics and Applications, Huazhong University of Science and Technology Press, p90), this high-temperature PTCR material will Lead pollution to the environment. Contents of the invention [0003] The object of the present invention is to provide a kind of high Curie temperature BaTiO 3 Based on positive temperature coefficient thermistor and preparation method, the high Curie temperature BaTiO 3 The positive temperature coefficient thermistor has no lead additives, is environmentally friendly,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01C7/02C04B35/468
Inventor 曲远方霍伟荣
Owner TIANJIN UNIV
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