NTC (negative temperature coefficient) thermistor material with high B value and, high electrical resistivity and preparation method of thermistor material
A negative temperature coefficient and thermistor technology, applied in the field of negative temperature coefficient thermistor materials and their preparation, can solve problems such as low resistivity ρ, achieve uniform particle size distribution, broad market application prospects, and good stability Effect
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Embodiment 1
[0031] The preparation method of the thermistor material described in this embodiment is as follows:
[0032] (1) Take analytically pure Al respectively 2 o 3 1mol, Cr 2 o 3 0.3mol, NiO 0.15mol, AlN 0.5mol, SiO 2 0.6mol, placed in a ball mill jar, then added agate balls and absolute ethanol to obtain a mixture; the weight ratio of the raw materials, dispersion medium and grinding balls was 1:4:6.
[0033] (2) The mixture obtained in step (1) was ball-milled at a speed of 350 r / min for 8 hours, and dried at 100° C. to obtain a powder.
[0034] (3) After fully grinding the powder obtained in step (2), press it into a block, wherein the pressure is 20kgf / cm 2 ;High-temperature treatment was carried out in a nitrogen-protected atmosphere furnace with a purity of 99.99%. The conditions for high-temperature treatment were: the airflow rate was 0.3L / min, and the heating rate was 5°C / min; pre-burning at 500°C for 6 hours; Calcined at constant temperature for 3h; annealed at 600°...
Embodiment 2
[0056] The preparation method of the thermistor material described in this embodiment is as follows:
[0057] (1) Take analytically pure Al respectively 2 o 3 1mol, Cr 2 o 3 0.35mol, NiO 0.2mol, AlN 0.55mol, SiO 2 0.65mol, placed in a ball mill jar, then added agate balls and absolute ethanol to obtain a mixture; the weight ratio of the raw materials, dispersion medium and grinding balls was 1:3:5.
[0058] (2) The mixture obtained in step (1) was ball-milled at a speed of 400 r / min for 6 hours, and dried at 80° C. to obtain a powder.
[0059] (3) After fully grinding the powder obtained in step (2), press it into a block, wherein the pressure is 10kgf / cm 2 ;High-temperature treatment is carried out in an atmosphere furnace protected by nitrogen with a purity of 99.99%. The conditions for high-temperature treatment are: the airflow rate is 0.4L / min, and the heating rate is 5°C / min; pre-burning at 600°C for 5 hours; Calcined at constant temperature for 3h; annealed at 600...
Embodiment 3
[0066] The preparation method of the thermistor material described in this embodiment is as follows:
[0067] (1) Take analytically pure Al respectively 2 o 3 1mol, Cr 2 o 3 0.33mol, NiO 0.1mol, AlN 0.3mol, SiO 2 0.45mol, placed in a stirring container, and then added acetone as a dispersion medium to obtain a mixture; the weight ratio of the raw material to acetone was 1:3.
[0068] (2) Stir the mixture obtained in step (1) at a stirring speed of 80 r / min for 24 h, and dry at 90° C. to obtain a powder.
[0069] (3) After fully grinding the powder obtained in step (2), press it into a block with a pressure of 15kgf / cm 2 ;High-temperature treatment is carried out in an atmosphere furnace protected by argon gas with a purity of 99.99%. The conditions for high-temperature treatment are: the airflow rate is 0.5L / min, and the heating rate is 8°C / min; pre-burning at 550°C for 6 hours; Roasting at constant temperature for 5h; annealing at 650°C for 10h.
[0070] (4) Natural co...
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