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Tungsten Carbide From Jxburgmann.com

  • Date:2016-10-14
  • Abst:

    Tungsten Carbide is a gap compound filled with C atoms in the W crystal, which has high strength and rigidity as a covalent compound, high melting point as an ionic crystal, and electromagnetism as a transition metal.

    Tungsten carbide in the defense, chemical, electronics industry, mechanical tools and surface coating has a wide range of applications.

    With high hardness, good wear resistance, fracture resistance and high temperature strength characteristics.

    These properties make it a coating for ceramics, porcelain and cutting instruments.

    However, due to the high melting point of tungsten carbide, usually up to 2800 ° C, keratinous alloys can hardly be formed by the sintering process.

    In general, Co metals are used to bond tungsten carbide particles to improve their bending resistance, but Co reduces the corrosion resistance, hardness and wear resistance of the alloy, leading to the development of occupational asthma to a certain extent.

    Therefore, a method of sintering tungsten carbide by ion, microwave, high-frequency induction and high-temperature hydrostatic pressing is adopted, but the high processing cost limits their application in industrial production scale.

    Tungsten carbide nanoparticles as precursors of hard metal alloys can significantly improve the strength, hardness and toughness of sintered alloys.

    The smaller the particle size of tungsten carbide, the lower the compaction temperature and the shorter the sintering time.

    In addition, the nano-sized tungsten carbide particles may be compacted at 500 ° C, as compared to more than 1,200 ° C for micron sized tungsten carbide particles.

    In addition to its physical properties, Pt-like properties of tungsten carbide as a catalyst, studies of tungsten carbide in chemical and electrochemical catalysis have been of wide interest.

    It has been proposed that tungsten carbide is partially or entirely substituted for a noble metal such as Pt to reduce the cost.

    In fact, tungsten carbide as a catalyst is first used for the isomerization of alkanes and exhibits a high catalytic activity comparable to that of Pt.

    Tungsten carbide has also been found to have a relatively high catalytic activity in catalyzing the hydrogenation of ethane and corn stalks, the reforming of methane and cellulose, the decomposition of methanol, the dehydrogenation of butane, and the hydrogenation and dechlorination of freon.

    When the surface of tungsten carbide is being modified or the reaction temperature is changed, the tungsten carbide manufacturers show selectivity in catalyzing the isomerization of alkanes and alcoholic hydrogenation.