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Ceramic positive temperature coefficient (PTC) thermistor of variable-frequency air conditioner starter and manufacturing method thereof

A technology of thermistor and inverter air conditioner, applied in the direction of resistor with positive temperature coefficient, can solve the problems of short action time, low voltage withstand capability, capacitor charging, etc., to simplify the material preparation process, improve the withstand voltage capability, Reasonable selection of raw materials

Inactive Publication Date: 2012-08-29
DANDONG GUOTONG ELECTRONICS COMPONENTS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The existing inverter air conditioner starter ceramic PTC thermistor has shortcomings. First, the material formula contains lead oxide (PbO) or lead carbonate (PbCO3), which does not meet environmental protection requirements; second, the electrical performance is not ideal. The temperature is 120±5°C, the action time is short, it is easy to cause insufficient charging of the capacitor, affecting the normal start-up, the efficiency of the withstand voltage is low, generally less than AC700V, the impact resistance to high voltage and large current is insufficient, and the service life is affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Raw material molar ratio:

[0037] TiO 2 : 1.022mol,

[0038] BaCO 3 : 0.790 mol,

[0039] CaCO 3 : 0.179 mol,

[0040] SiO 2 : 0.022 mol

[0041] Y 2 o 3 : 0.0021mol,

[0042] 50% by mass of Mn(NO 3 ) 2 Solution: 0.005ml / wt%;

[0043] Preparation:

[0044] 1) Primary mixing: Put the weighed raw material ingredients after drying into the ball mill tank, according to the raw material ingredients: agate ball: deionized water weight ratio = 1:1.5: 1.5, carry out ball milling, the ball mill tank speed is 50±5 RPM, time 20 hours, deionized water is required to be greater than 8MΩ;

[0045] 2) Pre-firing synthesis; dry the ingredients that have been ball-milled once to remove most of the water and make them into a cylindrical shape, burn them in a high-temperature furnace at 1170±10°C for 2 hours, then cool them down to 200°C naturally, take them out and cool them down to room temperature naturally ;

[0046] 3) Secondary mixing; pre-fired and synthes...

Embodiment 2

[0055] Raw material molar ratio:

[0056] TiO 2 : 1.022mol,

[0057] BaCO 3 : 0.8 mol,

[0058] CaCO 3 : 0.182mol,

[0059] SiO 2 : 0.0225mol,

[0060] Y 2 o 3 : 0.00215mol,

[0061] 50% by mass of Mn(NO 3 ) 2 Solution: 0.005ml / wt%;

[0062] The preparation method is the same as in Example 1.

Embodiment 3

[0064] Raw material molar ratio:

[0065] TiO 2 : 1.022mol,

[0066] BaCO 3 : 0.81 mol,

[0067] CaCO 3 : 0.185mol,

[0068] SiO 2 : 0.023mol,

[0069] Y 2 o 3 : 0.0022mol,

[0070] 50% by mass of Mn(NO 3 ) 2 Solution: 0.005ml / wt%;

[0071] The preparation method is the same as in Example 1.

[0072] According to GB / T7153-2002, the electrical performance test results of the samples are as follows:

[0073] experimental method Voltage withstand capability Room temperature resistivity Curie temperature ① AC1000V 230Ω·cm 128℃ ② AC950V 200Ω·cm 130℃ ③ AC950V 195Ω·cm 132℃

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Abstract

The invention relates to a ceramic positive temperature coefficient (PTC) thermistor of a variable-frequency air conditioner starter and a manufacturing method thereof. The ceramic PTC thermistor belongs to the (Ba1-xCaX) TiO3+TiO2+Y2O3+SiO2+Mn(NO3)2 series. The ceramic PTC thermistor is prepared by 1.022 mol of TiO2, 0.790 to 0.810 mol of BaCO3, 0.179 to 0.185 mol of CaCO3, 0.022 to 0.023 mol ofSiO2, 0.0021 to 0.0022 mol of Y2O3 and 50 mass percent of Mn(NO3)2 solution at the concentration of 0.005 ml per weight percent by a one-step synthesis method. The raw materials are reasonable; the production process is simple; in the product, the Curie temperature is between 125 and 135 DEG C, the voltage resistance is more than AC800V, and the resistivity at room temperature is 190 to 480 Omegacm; and the ceramic PTC thermistor is particularly suitable for the variable-frequency air conditioner starter.

Description

technical field [0001] The invention relates to a ceramic PTC thermistor and a manufacturing method thereof, in particular to a manufacturing method of a ceramic PTC thermistor used for an inverter air conditioner starter. PTC stands for positive temperature coefficient and is the abbreviation of Positive temperature coefficient. Background technique [0002] The existing inverter air conditioner starter ceramic PTC thermistor has shortcomings. First, the material formula contains lead oxide (PbO) or lead carbonate (PbCO3), which does not meet environmental protection requirements; second, the electrical performance is not ideal. The temperature is 120±5°C, the action time is short, it is easy to cause insufficient charging of the capacitor, which affects the normal start-up, and the voltage resistance is low, generally less than AC700V, and the impact resistance to high voltage and large current is insufficient, which affects the service life. Contents of the inventio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/468C04B35/622H01C7/02
Inventor 刘文磊侯文平
Owner DANDONG GUOTONG ELECTRONICS COMPONENTS
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