W-type low-and-medium temperature NTC-PTC binary composite thermistor material and preparation method thereof
An NTC-PTC and thermistor technology, which is applied to the W-type medium and low temperature NTC-PTC dual composite thermistor material and its preparation field, can solve the problems of environmental pollution, excessive raw material involvement, breakdown, etc., and can be widely used effect of value
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[0033] The preparation process and steps of this embodiment are as follows:
[0034] 1. Preparation of La 2 / 3 Sr 1 / 3 MnO 3 Main phase compound
[0035] 1) Weigh the high purity SrCO containing the three metal elements of La, Sr and Mn according to the stoichiometric ratio 3 , La 2 O 3 With MnO 2 Compound used to prepare the main phase La 2 / 3 Sr 1 / 3 MnO 3 Compound
[0036] 2) Put the main phase La 2 / 3 Sr 1 / 3 MnO 3 The raw material mixture is ground in an agate mortar for 8-10 hours, and pre-fired at 800-1000°C for about 8-10 hours;
[0037] 3) Put the preparation main phase La 2 / 3 Sr 1 / 3 MnO 3 The raw material mixture is pulverized by an agate mortar (particle size is less than 1um), and molded by a tablet press (molding pressure is 10-14MPa), and finally put into a crucible and sintered at 1250-1350℃ in a muffle furnace for sintering time For about 20-24 hours, the phase will be formed after natural cooling;
[0038] 4) Put the phased La 2 / 3 Sr 1 / 3 MnO 3 Crush and grind...
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