A high-performance silver-saving electrical contact material and its preparation method
An electrical contact material and high-performance technology, applied in the field of metal composite materials, can solve the problems of reducing gas content, high gas content, material arc burning resistance, dispersive material performance instability, etc.
Active Publication Date: 2015-08-19
JINGJIANG HAIYUAN NONFERROUS METAL MATERIAL
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Problems solved by technology
There are still two problems with silver (WC.TiC) materials: 1. The wettability between silver and (WC.TiC) is poor. The materials produced by daily processes have high gas content, and the electrical performance potential of the materials cannot be effectively exerted.
2. In order to reduce the gas content of the material, the larger particle size (WC.TiC) particles are used, which will cause a large dispersion of the material's ability to resist arc burning (that is, the material's performance is unstable), and also limit the material. The performance potential of the
[0007] If the above problems are not effectively solved, this material can only stay in the laboratory or on a theoretical level.
Method used
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Embodiment 1
[0050] 1. Classify (WC.TiC) to obtain (WC.TiC) powders with an average particle size of 3.5um, 2.2um and 1.0um, mix them in a ratio of 1:2:1, and add the calculated cobalt oxalate Solution, with uniform, dry. The powder is heat-treated at 550°C / hour, passed through a 500-mesh sieve, and the finished powder is obtained. The cobalt content in the finished powder ensures that the cobalt content of the final product is 3%;
[0051] 2. General use (WC.TiC) composite powder, transfer to dilute solution diluted with distilled water 100:1 ammonia water, start ultrasonic wave for 10-15 minutes, and let stand for 12 hours. Prepare the amount of silver, dissolve it with nitric acid, add ammonia water for complexation, control the pH value to 9-10, filter the supernatant, and let it stand for use;
[0052] At the beginning of electroless plating, start the ultrasonic wave, add the sensitizing solution after 10 minutes, the dosage is adjusted according to the weight of (WC.TiC) composite ...
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Abstract
The invention discloses a high-performance silver-saving electric contact material and a preparation method thereof. The high-performance silver-saving electric contact material comprises the following components by percentage by weight: 45-73 percent of (WC.TiC), 2-5 percent of cobalt, less than 0.1 percent of rare earth and the balance of silver, wherein the granularity of arc-protection components is 0.7-4 microns (WC.TiC); the intervals between fine (WC.TiC) is controlled at 0.1-1.0 micron. By developing a special process route, good wettability / combination is realized between silver and (WC.TiC) in a static state, fine textures needed for bringing the potential of the material into play can be produced, and the hard phase granularity and dispersion uniformity are ensured; one to more trace elements are added into the material to improve the wettability between liquid silver and a hard phase (WC.TiC) under the action of electric arc, so that the comprehensive performance of the material is improved comprehensively; meanwhile, a small amount of rare earth is added to improve the performance of the grain boundary of a silver material.
Description
technical field [0001] The invention relates to a metal composite material, in particular to a high-performance silver-saving electrical contact material and a processing method thereof. Background technique [0002] In low-voltage, medium-to-high-current electrical switches, as a contact material, silver-based composite materials dominate, which mainly depends on silver's good electrical and thermal conductivity and stable chemical properties. However, silver is a rare and precious metal with high value and limited output. Therefore, reducing the silver content as much as possible while further improving the performance of silver-based composite materials is a problem of great practical significance that material workers are concerned about. [0003] Silver tungsten contacts have been widely used since they came out in 1937. Silver tungsten is a silver-containing sintered contact material with tungsten as the skeleton. The sintered material combines the high electrical con...
Claims
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IPC IPC(8): C22C29/06C22C1/05
Inventor 韩瑞
Owner JINGJIANG HAIYUAN NONFERROUS METAL MATERIAL