Ceramic PTC thermistor element and preparation method thereof
A thermistor element and ceramic technology, applied in the field of ceramic PTC thermistor element and its preparation, can solve the problems of inability to make adjustments as required, inaccurate proportions of ingredients and poor product performance stability, etc., and achieve pressure resistance performance. Excellent, stable product performance, good resistance consistency
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[0009] The invention provides a method for preparing a ceramic PTC thermistor element, which includes the following steps:
[0010] Step 1. Take BaCO 3 , CaCO 3 , TiO 2 The main raw material is mixed with the first semiconducting agent, wet ball milled for a predetermined time, filtered and dried, and then pre-fired to synthesize the first main material. In this embodiment, the predetermined time of the wet ball milling is 20h-24h. In addition, the synthesis temperature of the No. 1 main ingredient is 1130°C to 1150°C, and the synthesis time is 2h to 3h.
[0011] Step 2. Take Pb 3 O 4 , TiO 2 The main raw material is mixed with the second semiconducting agent, wet ball milled for the predetermined time, filtered and dried, and then pre-fired to synthesize the second main material. Wherein, the first semiconducting agent or the second semiconducting agent includes trivalent or pentavalent rare earth trace elements. Specifically, in this embodiment, the first semiconducting agent i...
Example
[0015] First embodiment
[0016] The preparation of No. 1 main ingredient includes the following steps:
[0017] (1) Weigh the raw material: BaCO 3 :69.5089Kg, CaCO 3 :1.0903Kg, TiO 2 : 29.1886Kg, Sb 2 O 3 :0.0635Kg, Nb 2 O 5 :0.1158Kg, Y 2 O 3 : 0.0328Kg;
[0018] (2) Pour the six raw materials into a ball mill tank, add deionized water and wet ball mill for 24 hours;
[0019] (3) After pressure filtration and drying, put it into a crucible for pre-sintering reaction synthesis, the synthesis temperature is 1150℃, and the synthesis time is 2h.
[0020] The preparation of No. 2 main ingredient includes the following steps:
[0021] (1) Weigh the raw material: Pb 3 O 4 :74.4281Kg, TiO 2 :25.4457Kg, Nb 2 O 5 : 0.1262Kg;
[0022] (2) Pour these three raw materials into a ball mill tank, add deionized water and wet ball mill for 24 hours;
[0023] (3) After pressure filtration and drying, put it into a sagger for pre-burning reaction synthesis, the synthesis temperature is 950°C, and the synthe...
Example
[0030] Second embodiment
[0031] The preparation process of the second embodiment is roughly the same as that of the first embodiment, and the difference lies in:
[0032] The preparation of the finished product includes the following steps:
[0033] (1) Weigh No. 1 main ingredient: 139.1165g;
[0034] (2) Weigh No. 2 main ingredient: 60.8835g;
[0035] (3) Weigh Al 2 O 3 :2.0462g, SiO 2 :1.2057g, BN: 0.6973g, measure 50% Mn(NO 3 ) 2 Solution: 0.1119ml;
[0036] (4) The above materials are wet ball milled with deionized water for 24 hours, then dried, and an appropriate amount of PVA binder is added to mix and granulate;
[0037] (5) Dry pressing, sintering the formed piece in a kiln at 1260°C for 1 hour to form porcelain. After the grinding piece is cleaned, the electrode is used to prepare the finished product.
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