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

A technology of thermistors and frequency conversion air conditioners, applied in the direction of resistors with positive temperature coefficients, etc., can solve the problems of short operating time, low voltage withstand capacity, and impact on service life, so as to simplify the material preparation process and improve the withstand voltage capacity , The effect of simple production process

Inactive Publication Date: 2013-10-02
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% Mn(NO 3 ) 2 Solution: 0.005ml / wt%;

[0043] Preparation:

[0044] 1) One-time mixing: put the weighed raw materials after drying into the ball mill tank, according to the weight ratio of raw material ingredients: agate ball: deionized water = 1:1.5: 1.5, ball mill, the speed of the ball mill tank is 50±5 Revolution / minute, time 20 hours, deionized water requirement is greater than 8MΩ;

[0045] 2) Pre-fired synthesis; dry the ball-milled ingredients 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 to 200°C, take them out and cool to room temperature ;

[0046] 3) Secondary mixing; the pre-fired synthesized material is ball milled according to the raw material ingredients: agate ball: deionized water weig...

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% 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% 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 Withstand voltage capability Room temperature resistivity Curie temperature ① AC1000V 230Ω·cm128℃ ② AC950V 200Ω·cm130℃ 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 of SiO2, 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 Omega cm; 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, in particular to a manufacturing method of a ceramic PTC thermistor used in a starter of an inverter air conditioner. PTC stands for positive temperature coefficient and is the abbreviation of Positive temperature coefficient. Background technique [0002] The existing ceramic PTC thermistors of inverter air conditioner starters have 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, Curie The temperature is 120±5°C, the action time is short, it is easy to cause insufficient charging of the capacitor, affecting normal startup, and low voltage withstand efficiency, generally less than AC700V. The impact resistance to high voltage and large current is insufficient, which affects the service life. Summary of the invention [0003]...

Claims

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Application Information

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