It should be noted that there are many specifications and configurations of inlet filters. In addition to meeting the requirements of flow rate (pumping speed), fineness and temperature resistance must also be considered. Common filter materials include paper and polyester. Obviously, they are not suitable for high temperature environments. And their fineness are high, filtering 5, 3, 1 and even 0.6 microns powder. It will make the vacuum degree fail to achieve. Stainless steel filter elements are not only resistant to high temperature and corrosion, but also have lower fineness. It is more in line with the requirements of vacuum sintering process. Therefore, stainless steel filter elements are usually selected for vacuum sintering process.
Vacuum Sintering is a method of sintering a porcelain body under vacuum conditions. The porcelain body contains a amount of pores. Vapor, hydrogen and oxygen can escape from the closed pores by dissolution and diffusion; carbon dioxide and nitrogen are not easy to escape from the closed pores due to their low solubility, resulting in pores in the product and reduced density. If the porcelain body is sintered under vacuum conditions, all gases will escape from the pores before completion. So that the product does not contain pores, thereby improving the density of the product.
Many people equips exhaust filter but without inlet filter for vacuum furnace. Actually, during the vacuum sintering process, particulate matter may be generated due to material volatilization, powder raw materials, chemical reactions, etc. In order to avoid contamination of the workpiece or affecting equipment, it is necessary to install an inlet filter on the vacuum pump.
Last but not least, stainless steel filter elements also have different fineness, and the fineness is generally expressed in mesh numbers. For example, 100 mesh for 150 microns, 300 mesh for 50 microns. But the particles it filtered are larger, right? Contact us if you have needs, we will recommend or design solution for you!
Post time: Feb-28-2025
