Compared with steel balls, shot puts or cemented carbide balls, tungsten ball are more suitable as the impact body of cluster bullets, which can significantly increase the lethality of weapons; they are also more suitable as rolling parts of aerospace instruments because they can effectively improve the equipment. Accuracy. Now, in order to further increase the power of the cluster bomb and the accuracy of the instrument, the researchers have designed a new type of tungsten carbide ball with the characteristics of larger specific gravity, higher dimensional accuracy, and better dimensional stability.
A new type of tungsten carbide ball manufacturing method is mainly based on the W-Ni-Fe series tungsten alloy, adding Co, Cr, Mo, B and RE (rare earth elements). The specific chemical composition (weight%) is W75～99.91%, Ni0.5～20%, Fe0.5～20%, the sum of any one or more of Co, Cr, Mo, and B is 0.009～6%, RE0. 001～1.0%.
The role of Co: adding a certain amount of Co can improve the process performance of the tungsten ball, make the product size stable without deformation; at the same time, improve the uniformity of the alloy structure, prevent the formation of W-Ni intermetallic compounds (brittle phase), and improve Mechanical properties of alloy
The role of RE: the added rare earth elements will be evenly distributed in the binder phase or the interface between the binder phase and the tungsten grains, preventing the growth of tungsten grains, making them spheroidizing, and refining the grains; in addition, rare earth elements The element also hinders the diffusion process of oxygen atoms into the alloy, plays an anti-oxidation effect of the alloy, and enhances the corrosion resistance to acid. RE exists in the form of solid solution in the alloy, so the content should be controlled within a certain range.
The new tungsten carbide ball produced by this method has the characteristics of higher specific gravity and strength, better toughness, oxidation resistance and corrosion resistance. Moreover, the method has the characteristics of simple process, easy mass production, low cost and high yield.
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