Process for producing high temperature and pressure resistant PTC (Positive Temperature Coefficient) thermistor ceramics
A thermistor and production process technology, applied in the field of electronic component preparation, can solve the problems of uneven dispersion of PTC thermistor ceramic components, uneven grain size, poor voltage resistance performance, etc., to achieve low attenuation performance, The effect of uniform dispersion of components and high alpha coefficient
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Embodiment 1
[0037] (1) Preparation of material A:
[0038] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 7236.0g TiO 2 、30.387gY 2 o 3 , 269.285g CaCO 3 ;
[0039] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 34Kg deionized water and 169.9g dispersant, stir for 30 minutes, and send it to the circulating stirring system after filtering and removing iron;
[0040] 3) Circulating stirring and grinding, filtering and iron removal: Add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 5.0m 3 , the grinding speed is controlled at 200 rpm, and the grinding time is 300 minutes; after filtering and removing iron, it is sent to a filter press;
[0041] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;
[0042] 5) Calcination synthesis: the...
Embodiment 2
[0056] (1) Preparation of material A:
[0057] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 7477.3gTiO 2 , 12.441g Y 2 o 3 , 223.947g CaCO 3 ;
[0058] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 25Kg deionized water and 74.65g dispersant, stir for 20 minutes, and send it to the circulating stirring system after filtering and removing iron;
[0059] 3) Circulating stirring and grinding, filtering and iron removal: add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 4.5m 3 , the grinding speed is controlled at 180 rpm, and the grinding time is 250 minutes; after filtering and removing iron, it is sent to a filter press;
[0060] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;
[0061] 5) Calcination synthesis: ...
Embodiment 3
[0075] (1) Preparation of material A:
[0076] 1) Material preparation: take 17.169Kg BaCO respectively 3 , 6696.2gTiO 2 , 26.6g Y 2 o 3 , 290.184g CaCO 3 ;
[0077] 2) Pre-mixing and filtering to remove iron: Put the weighed raw materials into the pre-mixing tank, add 36.3Kg deionized water and 169.27g dispersant, stir for 40 minutes, and send it to the circulating stirring system after filtering to remove iron;
[0078] 3) Circulating stirring and grinding, filtering and iron removal: Add 150Kg granular zirconia ceramic balls with a diameter of 5mm in the circulating mixing tank, and carry out cyclic grinding of the pre-stirred slurry, and the circulating flow rate is controlled at 5m 3 , the grinding speed is controlled at 220 rpm, and the grinding time is 200 minutes; after filtering and removing iron, it is sent to a filter press;
[0079] 4) Press filter dehydration: filter and dehydrate the above slurry with a filter press;
[0080] 5) Calcination synthesis: the ...
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