the introduction microwave sintering in metal

►Changsha langfeng introduce microwave sintering in metal:

It is known that metals are good conductors, cannot absorb microwave, so can't use metal utensils in microwave heating, but scientists at the university of Pennsylvania materials research laboratory in the journal nature, said the metal powder is a good microwave absorber, can be effectively heating, the heating rate can reach 100 ℃. They use 2.45 GHz microwave field in the study of iron, nickel, tungsten, aluminum, copper, aluminum and tin of metal and metal alloy powder on the heating test, and by using microwave heating sintering method successfully with metal powder made from the small gears and other rings, tubular mechanical parts. With using ordinary compared to make metal parts, high temperature heating sintering, the sintering products not only solid density, and has better ductility and toughness. In fact, only by using microwave heating 15 min to 30 min can be finished any metal parts is composed of sintering.

Chemizzs people use microwave sintering technology such as Al/SiC composite materials for the preparation, the composite material of ultrafine grain block. In a compact, SiC Al oxide film on the surface of the particles can be crushed, thus increasing the Al microwave absorbing ability.

Some researchers in Canada Quebec metal company production of iron and copper alloy mixed powder pressed into 31.85 mm x 12.80 mm x 6.95 mm of billet, and then heat up to 500 ℃ binder, again with the ordinary sintering and microwave sintering technology into fracture specimens. Results show that the mechanical properties of the samples in the microwave sintering reach or exceed normal TC - 0208 made of steel, powder metallurgy sintering, its strength, 1077 mpa, than with a 30% increase over the conventional method of sintering density also increased to 7.45 g/cm3. Holes through the detection of microwave sintering samples is very small, spherical and uniform distribution, while the common method of sintering material after the holes is larger, there are sharp corners in the hole, uneven distribution.Concluded from this study is that improve the mechanical properties of the material due to internal void volume is smaller, the shape changes after microwave sintering, density increases and other causes.

A deep study of mechanism of microwave sintering materials is the basis of extend the kinds of sintering materials, expanding the scope of application of microwave sintering technology.

Electric hysteresis loss characteristics of each material are related to microwave frequency, temperature, density of the material itself, impurities and other factors, so look for specific materials and microwave coupling of microwave frequencies and better explore its changes with various parameters is required to solve as soon as possible.

Microwave equipment has been a major problem restricting microwave sintering technology industrial applications. Currently, the maximum sintering temperature microwave sintering equipment can reach 1700 ℃, working frequencies of 28GHz, 60GHz, 2.4GHz, 915MHz and so on, since the frequency of 28GHz, 60GHz microwave sintering equipment cost is too high, it is still unable to carry out industrial applications. With the microwave sintering technology development and expanding the types of sintered material, the modular design of microwave devices should be paid much attention.

As the industrial application of microwave currently there are still some issues to be resolved, such as greater access to homogeneous microwave field, low dielectric loss materials at room temperature and a critical temperature point, the microwave penetration within the feedstock, heating depth and other issues. Microwave tubes in different materials in the life of the furnace lining, multiple microwave tube coupling in large scale production and other problems worth further study. In addition, the technology practical difficulties impede include: sintered material types limitation, thermal runaway heating process, it is difficult to accurately measure and control temperature, cracking the sintered member, and low sintering yield.

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