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Sintered metal mesh stainless steel filter is how to complete? The process of metal sintering and heat treatment includes: charging, vacuum, degassing, heating, argon filling, heat preservation, cooling, discharging and so on. Charging is to first put the compacts in the sintering tray or box. The tray or material box is made of high temperature resistant materials such as molybdenum sheet, heat-resistant steel or graphite, so as to avoid deformation during sintering. Charging requires that the compacts do not touch each other directly, so as to prevent the compacts from sticking to each other during sintering, and the compacts can also be separated from each other by molybdenum sheets. Then push the tray or box into the furnace, cover the furnace and seal it. Start the vacuum unit to vacuum, the sintering chamber and the air attached to the compacts on the air. Use mechanical pump to pump vacuum to high vacuum pump population requirements of the vacuum degree, and then open the high vacuum pump. The general requirement for secondary vacuum to 1.3 xio-zpa. The furnace is electrically heated and continuously pumped at a temperature of 400500 ~ C. This process can eliminate the residual stress of compacts and make the gas adsorbed inside and outside the compacts and organic medium such as lubricant and granulating agent gradually differentiate and evaporate. The furnace is electrically heated and continuously pumped at temperatures of 400-500 C. This process can eliminate the residual stress of compacts and make the gas adsorbed inside and outside the compacts and organic medium such as lubricant and granulating agent gradually differentiate and evaporate.
After degassing, the furnace is heated up to the sintering temperature. The sintering temperature is different for different materials, so the sintering temperature should be precisely determined and controlled. If the temperature is too high, the product will soften and deform, and the grain will be coarse or even scrapped. If the sintering temperature is too low, the densification rate of compacts will be slow, the sintering time will be prolonged, and the utilization rate of equipment will be decreased. With the increase of temperature, under the action of vacuum, the cleaning of the gas in the green tends to be complete. On the sintering in the maintenance atmosphere, at this time to the sintering chamber filled with argon, so that sintering in the maintenance atmosphere. Stop the vacuum unit after filling argon to reduce power consumption. At the sintering temperature, the metal net is kept warm for a period of time, so that the compact produced in the process of sintering can be fully densified, and the porosity of the product can be shortened, eliminated and transformed into crystal to satisfy the time. The length of heat preservation time depends on the size and number of sintered products. The proper sintering temperature and holding time can be determined by measuring the density and magnetic function of the product. The product temperature after sintering is very high. If it is fired directly, it will cause incineration and pulverization, so it is necessary to cool it before firing. The phase structure in the magnet will change when the cooling rate is slow, and some phases will be bad for the magnetic function, so it should be cooled quickly to keep the phase structure of the sintered state. In production, the cooling of sintered body is connected with heat treatment. This article is from stainless steel filter http://www.huanawl. com/no reprinting without permission.