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Mosten Alloy Co., Ltd.

Preparation of nanometer tungsten alloy block materials

  • Mosten
  • 19 Oct

Nanostructure materials because its composition of ultrafine grain, there is a lot at the grain boundary and grain size of the atoms of the defect and its surface effect, small size effect, quantum size effect and macroscopic quantum tunneling effect, thus the mechanical, physical and chemical properties shows that cannot be compared with the performance of the ordinary coarse grain materials. Nanomaterials show broad application prospects in chemistry, electronics, metallurgy, astronautics, biology, medicine and other fields.

High specific gravity refractory tungsten alloy has special physical and mechanical properties that can not be matched by other materials, such as high density, high hardness, high strength, high melting point, high thermal stability, good machining performance and good oxidation and corrosion resistance. Therefore, it plays an irreplaceable role in national defense industry, aerospace, electronic information, energy and civil enterprises, and has a wide application prospect. The superior properties of high specific gravity refractory tungsten alloy can be improved and the poor properties of ordinary coarse tungsten alloy can be reduced by nanotechnology. For example, tungsten nickel iron mixed powder formed W supersaturated solid solution and amorphous phase formed by Ni and Fe elements on the W matrix after ball milling, which greatly improved the physical and mechanical properties of the alloy. The nano-high specific gravity tungsten alloy system mainly includes tungsten nickel iron, tungsten nickel copper, tungsten copper, WC-Co and other tungsten alloys.

The most common problems in sintered nano tungsten block materials are the growth of grains and the existence of a large number of micropores in the bulk materials. This has become the main restriction factor for the large-scale industrial application of nanostructured materials at this stage. Therefore, controlling the growth and reduction of grain size and eliminating the micropores in nanocrystalline tungsten block materials are key problems that must be solved in the application of nanocrystalline materials engineering. By studying the ideal process parameters, the nano-tungsten powder can reach full density after forming and sintering into nano tungsten block material, while keeping the grain size of tungsten block material to be nano-size. In this way, the particles can maintain their nano-properties and thus improve the properties of the material.