NTC thermistor material and preparation method thereof

The invention belongs to the field of thermistor materials, and particularly discloses an NTC thermistor material and a preparation method thereof. The preparation raw materials of the NTC thermistor material comprise the following oxide raw material components: aMn3O4bCo3O4cFe2O3dNiOeZnOfAl2O3, a, b, c, d, e and f are in mass percent, 67.0% < = a < = 75.0%, 3.0% < = b < = 7.0%, 2.5% < = c < = 6.5%, 14.0% < = d < = 18.0%, 0.4% < = e < = 1.4%, 1.5% < = f < = 2.5%, and a + b + c + d + e + f = 100%. The phase structure of the NTC thermistor material is a spinel pure phase, the resistivity is 3793 +/-5%-4453 +/-5% omega.cm, the B value is 3918 +/-3%-3958 +/-3% K, and the NTC thermistor is an adjustable medium-resistance medium-B value Mn-Co-Fe-Ni-Zn-Al series NTC thermistor. 本发明属于热敏电阻材料领域，具体公开一种NTC热敏电阻材料及其制备方法。本发明NTC热敏电阻材料的制备原料包括如下氧化物原料组分：aMn3O4bCo3O4cFe2O3dNiOeZnOfAl2O3，其中a、b、c、d、e、f为质量百分比，67.0％≤a≤75.0％，3.0％≤b≤7.0％，2.5％≤c≤6.5％，14.0％≤d≤18.0％，0.4％≤e≤1.4％，1.5％≤f≤2.5％，且满足a+b+c+d+e+f＝100％。本发明NTC热敏电阻材料的相结构为尖晶石纯相，电阻率为3