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Metal sintered mesh filter core is operated by sintering process

    The sintering and heat treatment process of the metal sintered mesh filter element includes the steps of charging, vacuuming, degassing, heating, argon filling, heat preservation, cooling, and discharging.

     The furnace is first placed in a tray or cartridge for sintering. The tray or cartridge is made of high temperature resistant material such as molybdenum sheet, heat resistant steel or graphite to avoid deformation during sintering. When charging, it is required that the compacts are not in direct contact to prevent the compacts from sticking to each other during sintering, and the molybdenum sheets may be used to separate the compacts from each other. Then push the loaded tray or cartridge into the furnace, cover the lid and seal.

    The vacuum unit is started to evacuate, and the air in the sintering chamber and the gas adhering to the compact are removed. After vacuuming with a mechanical pump to the vacuum required by the high vacuum pump population, the high vacuum pump is turned on. It is generally required to evacuate the second stage to 1.3XlO-ZPa.

     The furnace is energized and heated, and the pumping is continued at a temperature of 400-500 ° C. This process can eliminate the residual stress of the compact, and also gradually decomposes and volatilizes the gas adsorbed inside and outside the compact and the organic medium such as lubricant and granulating agent added during press molding.

     After degassing, the furnace is heated to the sintering temperature. For different materials, the sintering temperature is also different, and the sintering temperature should be accurately determined and controlled. Excessive temperatures can soften and deform the product, and the grains are coarse or even scrapped. When the sintering temperature is too low, the densification speed of the green compact becomes slow, the sintering time is prolonged, the utilization rate of the equipment is lowered, and the performance of the product is not required.

     As the temperature increases, the gas removal in the compact tends to be complete under vacuum. For sintering under a protective atmosphere, the sintering chamber is filled with argon gas at this time, so that the sintering is completed in a protective atmosphere. Stop the vacuum unit after filling with argon to reduce power consumption.

     The metal sintered mesh filter element is kept at the sintering temperature for a period of time, so that the densification of the green body occurring during the sintering process is sufficiently performed, and the pores of the product are shrunk, eliminated, and converted to the crystal for a sufficient period of time. The length of the holding time depends on the number and size of the sintered product. The density and magnetic properties of the article can be measured to determine the appropriate sintering temperature and holding time.

      The sintered product of the metal sintered mesh filter has a high temperature. If it is directly discharged, it will cause combustion and pulverization, so it must be cooled before it is discharged. The cooling rate has a certain influence on the performance of the magnet. When the cooling is slow, the phase structure in the magnet changes, and some phases which are unfavorable to the magnetic properties are generated, so it should be rapidly cooled to maintain the phase structure of the sintered state. In the production, the cooling of the sintered body is carried out in conjunction with the heat treatment.

sintered filter/filter strainer/polymeric filter

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