Powder metallurgy porous material

Manufactured by powder metallurgy method, the internal structure of porous materials (or products), generally spherical or irregular shaped metal or alloy powder is made by forming and sintering, also known as sintered porous materials. This material is pore crisscross each other run through the porous body, usually with 30 to 60% volume porosity, pore size 1 ~ 100 micron. Commonly used metals or alloys are bronze, stainless steel, iron, nickel, titanium, tungsten, molybdenum and refractory metal compounds, etc. Products are made of crucible-shaped, disk-like, tubular, plate, film, etc. Powder metallurgy porous material is characterized by: ① pore size and porosity can be controlled; ② through excellent performance, and can be regenerated after use, so long life; ③ thermal conductivity; ④ high temperature resistance, low temperature, heat shock; ⑤ medium corrosion resistance; ⑥ large specific surface area; ⑦ welding and processing can be. And therefore its overall performance than the traditional paper, cotton and chemical fiber fabrics, ceramics, glass, wire mesh and other filter material is better. In modern technology, porous materials play an increasingly important role in their. It has two main purposes:  ① To filter: To use its role in purifying porous filter separating liquids and gases. For example, aircraft and vehicles used to purify the fuel and air; the chemical industry on a variety of liquids and gases filtering; atomic energy for industrial discharges of radioactive gases and other particles in the filter. ② the role of its pores, manufacturing porous electrode, fire-fighting equipment, freezing equipment, high-temperature nozzle, etc. Porous electrode mainly used in electrochemistry. Fire-extinguishing equipment is to use its role to prevent the explosion of anti-stream, such as gas welding flame used in explosion-proof vehicles. Antifreeze device is using its porous to pass into the preheated air or a special liquid, is used to prevent icing the wings and tail. High-temperature nozzle principle is infiltrated porous skeleton of the low melting point metal evaporation absorbs heat, so that heat the surface of cooling, this material is known as sweating Materials.