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Pressure-sensitive silver-base composite ceramic as electrical contact material

A technology of electrical contact materials and composite ceramics, applied in the direction of contact materials, conductive materials dispersed in non-conductive inorganic materials, metal/alloy conductors, etc., can solve the problem of reducing contact yield, elongation reduction, large-scale Problems such as difficulties in production and application, to achieve the effects of reducing processing procedures and energy consumption, small contact resistance, improving electrical ablation resistance and temperature characteristics

Inactive Publication Date: 2006-01-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But SnO 2 The addition of the material makes the material produce strong dispersion hardening, especially in the later cold working process, the work hardening is obvious, the elongation rate is reduced, and the yield of the contact is reduced, which brings great difficulties to mass production and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] By weight percentage, the composition of the silver-based varistor composite ceramic electrical contact material is: silver 90%, varistor composite ceramic 8%, metal Ni 1%, metal oxide In 2 o 3 0.6% and MoO 3 0.4%. The composition of the pressure-sensitive composite ceramics is: (ZnO) 0.9 (La 2 o 3 ) 0.035 (Pr 6 o 11 ) 0.01 (Co 2 o 3 ) 0.018 (MnO 2 ) 0.012 (Bi 2 o 3 ) 0.015 (Sb 2 o 3 ) 0.01 .

[0023] The powders of the above-mentioned components are mechanically mixed and ground, initially pressed and annealed at 600°C, put into a hot extrusion machine after repressed, extruded into φ6 rods, drawn into wires, and produced according to conventional methods into contacts of various specifications. It passed the performance test under the conditions of AC 220V, 25A, closing force 100g, breaking force 75g, on-off ratio 1:1, contact frequency 90 times / min, and the number of test closures reached 130,000 times. It passed the performance test under the...

Embodiment 2

[0025] By weight percentage, the composition of the silver-based varistor composite ceramic electrical contact material is: silver 90%, varistor composite ceramic 8%, metal Ni 1%, metal oxide CuO 0.3%, NiO 0.5% and MoO 3 0.2%. The composition of pressure-sensitive composite ceramics is:

[0026] (ZnO) 0.9 (La 2 o 3 ) 0.01 (Y 2 o 3 ) 0.01 (Co 2 o 3 ) 0.015 (MnO 2 ) 0.01 (TiO 2 ) 0.005 (Bi 2 o 3 ) 0.02 (Sb 2 o 3 ) 0.03 .

[0027] The preparation and processing methods and performance test conditions of the materials are the same as those in Example 1. The test results show that the closing times of the AC test reached 115,000 times, and the closing times of the DC test reached 105,000 times.

Embodiment 3

[0029] By weight percentage, the composition of the silver-based varistor composite ceramic electrical contact material is: silver 90%, varistor composite ceramic 6%, metal Ni 2%, metal oxide In 2 o 31%, Bi 2 o 3 0.6% and MoO 3 0.4%. The composition of pressure-sensitive composite ceramics is:

[0030] (ZnO) 0.9 (La 2 o 3 ) 0.01 (Sm 2 o 3 ) 0.01 (Eu 2 o 3 ) 0.005 (Co 2 o 3 ) 0.018 (TiO 2 ) 0.012 (Bi 2 o 3 ) 0.015 (Sb 2 o 3 ) 0.03 .

[0031] The preparation and processing method of the material and the performance test conditions are the same as those in Example 1. The test results show that the number of closures in the AC test reaches 105,000 times, and the number of closures in the DC test reaches 100,000 times.

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Abstract

The pressure-sensitive silver-base composite ceramic is used as contact material in medium and low voltage electric equipment. The material consists of silver 80-95 wt%, pressure-sensitive composite ceramic 1-15 wt% and metal and metal oxide 0.5-5 wt%. The material of the present invention has low resistivity, high heat conducting and electric conducting performance, high ablation and fusion welding resistance, good machining performace and no toxicity, and may be prepared into wire, plate and rod. It has machining performance superior to Ag / SnO2 material.

Description

(1) Technical field [0001] The invention relates to a silver-based pressure-sensitive composite ceramic electrical contact material, which belongs to the technical field of contact materials in medium and low voltage electrical appliances. (2) Background technology [0002] In the prior art, the electrical contact element manufacturing materials used by medium and low voltage electrical appliances are mainly silver-based electrical contact materials. This is because silver has high electrical conductivity, high thermal conductivity, and good machinability, does not oxidize under atmospheric conditions, and can maintain properties such as low and stable contact resistance. However, pure silver electrical contact materials have low hardness and are easy to weld. Under DC working conditions, the tendency of material transfer is serious. Therefore, it is necessary to add other elements or compounds to silver to improve its performance. At present, silver-based electrical contac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01H1/02H01B1/02H01B1/16
Inventor 陈延学王成建梅良模栾开政阎景贤徐荣历
Owner SHANDONG UNIV
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