Composite electrical contact processing technology
A processing technology and technology of electrical contacts, applied in the direction of circuits, electrical switches, electrical components, etc., can solve problems such as unsatisfactory current breaking capacity, high gas content of contact materials, unsatisfactory current intermittent characteristics, etc., to solve the problem of forming Difficulty and infiltration difficulty, high performance uniformity, improved conductivity and current intermittent characteristics
Inactive Publication Date: 2012-05-09
蔡玉凤
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Problems solved by technology
Several materials have their own advantages and disadvantages. The silver tungsten carbide material uses the precious metal silver as the conductor material, which is too expensive; the copper-bismuth alloy has excellent performance, but the current breaking capacity is not ideal; , the current intermittent characteristics (cut-off value) are not ideal, and due to the infiltration process, copper accumulation is prone to occur; copper-chromium alloy materials have great potential, but now it is difficult to control impurities in chromium materials and the gas content of contact materials is high, resulting in material High performance dispersion
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[0022] From figure 1 It can be seen that the processing technology of a high-power hard copper-tungsten-iron composite electrical contact material is as follows:
[0023] First select copper powder to pass through a 400 mesh sieve, and mix the powder particles of tungsten carbide and tungsten between 3-6 μm in proportion, and the content of copper powder weight in the mixed powder is 8-12%;
[0024] The mixed raw material powder is heat-treated at 580--620°C for 2--4 hours, and pressed at a pressure of 4.5-8.5 tons / square centimeter, crushed after the first pressing, and again at 630 --Heat treatment at 670°C for 1.5-4 hours, and press for the second time at a pressure of 5.5-6.5 tons / square centimeter;
[0025] Crushing after the second compression molding, heat treatment at 670-710°C for 1.5-4 hours again, and pressing for the third time under the pressure of 5.5-6.5 tons / square centimeter;
[0026] After the third compression molding, it is crushed, heat-treated again at ...
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The invention discloses a composite electrical contact processing technology which comprises the following steps of: firstly selecting copper powder, tungsten carbide powder and tungsten powder of suitable particle size for mixing in proportion; heat-treating mixed raw material powder, compressing for molding and then preheating to obtain copper tungsten alloy blank; and finally sintering and infiltrating pure copper, iron co-alloy and preheated blank together to obtain a high-power rigid copper tungsten iron composite electrical contact material. Because iron co-alloy is adopted as a base material, the high-power rigid copper tungsten iron composite electrical contact material has the characteristics of high hardness and good wearability. Because the material adopts a copper material, combination properties of current breaking capacity, conductivity, current intermittent characteristic, and the like of the prepared electrical contact are improved. The property uniformity of the material is high in service life circle. With the adoption of the contact material, the electrical switch structure is simplified, dispersivity of a spring in a switch is eliminated, and the reliability of a part is greatly improved. The material is widely used in production of the electrical contact of various vacuum circuit breakers.
Description
technical field [0001] The invention relates to an electrical contact material in a vacuum circuit breaker, in particular to a high-power silver-free electrical contact material and its processing technology. Background technique [0002] In vacuum circuit breakers, there are many requirements for contact materials, mainly in three aspects: high current breaking characteristics (current breaking capacity), current intermittent characteristics (cut-off value) and high current-carrying properties (conductivity) sex). [0003] The materials currently used for vacuum circuit breakers are mainly silver tungsten carbide materials, copper bismuth alloys, copper tungsten alloys and copper chromium alloys. Several materials have their own advantages and disadvantages. The silver tungsten carbide material uses the precious metal silver as the conductor material, and the price is too expensive; the copper-bismuth alloy has excellent performance, but the current breaking capacity is no...
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IPC IPC(8): H01H11/04C22C1/04C22C32/00
Inventor 蔡玉凤
Owner 蔡玉凤
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