A kind of manufacturing method of high precision ntc thermistor chip
A technology for a thermistor chip and a manufacturing method, which is applied to resistors with negative temperature coefficients, resistors, non-adjustable metal resistors, etc., can solve the problem of low pass rate of resistance value, inability to obtain resistivity, B value and The pass rate of finished products, component segregation and other issues can be achieved to improve the pass rate of chip resistance and B value, the production process is easy to control, and the effect of high pass rate of finished products
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Embodiment 1
[0044] 1) Weigh 433.99g of trimanganese tetraoxide, 444.05g of nickel oxide, 583.58g of ferric oxide and 38.39g of alumina, mix ball mill for 20h, calcine at 450°C for 2h, ball mill for 20h, and calcinate at 950°C for 2h to obtain thermal ceramic powder;
[0045] 2) Ball mill the heat-sensitive ceramic powder for 20 hours, add 22.50g of binder PVA, granulate, and pass through a 60-mesh sieve to obtain a shaped powder;
[0046] 3) Add the molding powder to the hydraulic press, hold the pressure at 50MPa for 1min, and obtain a preform of 45mm×45mm×17mm, put the preform into a cold isostatic press, press at 300MPa for 2min, and obtain a molding block;
[0047] 4) Put the molded compact into the sintering furnace, control the oxygen intake to 0.5L / min, raise the temperature to 1200°C at a heating rate of 10°C / min, keep it for 2 hours, and cool down to 500°C at a cooling rate of 2°C / min , cooled naturally to room temperature to obtain a ceramic sintered block;
[0048] 5) Use a s...
Embodiment 2
[0054] 1) Weigh 396.10g of trimanganese tetraoxide, 156.48g of nickel oxide, 509.30g of ferric oxide and 489.31g of cobalt oxide, mix ball mill for 20h, calcinate at 550°C for 2h, ball mill for 20h, and calcinate at 1050°C for 2h to obtain heat sensitive ceramic powder;
[0055] 2) Mill the heat-sensitive ceramic powder for 20 hours, add 27.92g of binder PVA, granulate, and pass through a 60-mesh sieve to obtain a shaped powder;
[0056] 3) Add the molding powder to the hydraulic press, hold the pressure at 60MPa for 1min, and obtain a preform of 45mm×45mm×17mm, put the preform into a cold isostatic press, press at 300MPa for 3min, and obtain a molding block;
[0057] 4) Put the formed compact into the sintering furnace, control the oxygen flow rate to 1.0L / min, raise the temperature to 1250°C at a heating rate of 15°C / min, keep it for 1.5h, and cool it down to 400°C at a cooling rate of 5°C / min °C, naturally cooled to room temperature to obtain a ceramic sintered block;
[...
Embodiment 3
[0064] 1) Weigh 398.22g of trimanganese tetroxide, 448.19g of nickel oxide, 589.02g of ferric oxide and 64.57g of alumina, mix ball mill for 20h, calcinate at 650℃ for 2h, ball mill for 20h, and calcinate at 850℃ for 2h to obtain thermal ceramic powder;
[0065] 2) Ball mill the heat-sensitive ceramic powder for 20 hours, add 18.00g of binder PVA, granulate, and pass through a 60-mesh sieve to obtain a shaped powder;
[0066] 3) Add the molding powder to the hydraulic press, hold the pressure at 40MPa for 5min, and obtain a preform of 45mm×45mm×17mm, put the preform into a cold isostatic press, press at 400MPa for 2min, and obtain a molding block;
[0067] 4) Put the molded block into the sintering furnace, control the oxygen intake to 0.5L / min, raise the temperature to 1100°C at a heating rate of 5°C / min, keep it for 3 hours, and cool down to 600°C at a cooling rate of 3°C / min , cooled naturally to room temperature to obtain a ceramic sintered block;
[0068] 5) Use a slice...
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