Method for preparing high B-value NTC (negative temperature coefficient) thermal-sensitive material
A technology of negative temperature coefficient and thermistor, which can be applied to resistors with negative temperature coefficient, etc., can solve the problems of high cost, low abundance and high toxicity, and achieve the effect of low production cost and simple process steps.
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Embodiment 1
[0021] a. Weigh analytically pure AlN and SiO at a molar ratio of 0.82:0.68:1 2 and Al 2 o 3 The raw materials are placed in a ball mill tank, and the grinding balls and the dispersion medium are added with absolute ethanol, wherein the mass ratio of the grinding balls, the dispersion medium and the raw materials is 2:1:1;
[0022] b. Ball mill the raw materials in step a at a speed of 350r / min for 12h, and dry at a temperature of 80°C to obtain a powder;
[0023] c. After fully grinding the powder obtained in step b, press it into a block with a pressure range of 20kgf / cm 2 , high-temperature heat treatment in a nitrogen-protected atmosphere furnace with a purity of 99.99%, the high-temperature heat treatment conditions are: the airflow rate is 0.2L / min, and the temperature is raised at a heating rate of 5°C / min; the temperature is 500°C for 5 hours; the temperature is 950°C Roasting at constant temperature for 2 hours; annealing at 400°C for 10 hours;
[0024] d. Then na...
Embodiment 2
[0026] a. Weigh analytically pure AlN and SiO at a molar ratio of 1.5:0.75:1 2 and Al 2 o 3 The raw materials are placed in a ball mill jar, and the grinding balls and dispersion medium absolute ethanol are added, wherein the mass ratio of the grinding balls, dispersion medium and raw materials is 5:3:1;
[0027] b. Ball mill the raw materials in step a for 10 h at a speed of 400 r / min, and dry at a temperature of 50° C. to obtain powder;
[0028] c. After fully grinding the powder obtained in step b, press it into a block with a pressure range of 15kgf / cm 2 , high-temperature heat treatment in an atmosphere furnace protected by nitrogen with a purity of 99.99%, the high-temperature heat treatment conditions are: the airflow rate is 0.4L / min, and the temperature is raised at a heating rate of 6°C / min; the temperature is 600°C for 7 hours; the temperature is 1000°C Roasting at constant temperature for 3 hours; annealing at 600°C for 5 hours;
[0029] d. Then naturally cool ...
Embodiment 3
[0031] a. Weigh analytically pure AlN and SiO at a molar ratio of 1.3:0.72:1 2 and Al 2 o 3 The raw material is placed in a stirring container, and a dispersion medium acetone is added, wherein the mass ratio of the dispersion medium to the raw material is 3:1;
[0032] b. Stir the raw materials in step a for 18 hours at a stirring speed of 80 r / min, and dry at a temperature of 90° C. to obtain a powder;
[0033] c. After fully grinding the powder obtained in step b, press it into a block with a pressure range of 10kgf / cm 2 , high-temperature heat treatment in a nitrogen-protected atmosphere furnace with a purity of 99.99%, the high-temperature heat treatment conditions are: the airflow rate is 0.5L / min, and the temperature is raised at a heating rate of 8°C / min; the temperature is 550°C for 8 hours; the temperature is 1050°C Roasting at constant temperature for 4 hours; annealing at 650°C for 10 hours;
[0034] d. Then naturally cool down to room temperature with the furn...
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