Tungsten Carbide Cutting Tools Substrate Material

In conventional tungsten carbide cutting tools by adding a small amount (0.5% -3%) tungsten carbides (e.g. TaC, NbC, TIC, etc.), can significantly improve the hardness and wear resistance of tungsten carbide cutting tools without reducing its toughness, but also to improve the high temperature properties of the alloy to enhance its resistance to adhesion and proliferation-resistant wear. TIC hardness, heat resistance, bonding temperature, oxidation resistance and anti-abrasion ability than WC diffusion high, add TIC can improve these properties of the alloy, but also reduce the strength and toughness of the alloy. Add TaC and NbC can improve the alloy hardness and high temperature hardness, bonding capacity, antioxidant capacity and proliferation resistance. In addition, TaC tungsten carbide cutting tools can also improve the flexural strength, increased edge strength, strengthen the capacity and resistance to breakage edge chipping resistance. Add to WC-TIC-Co alloy suitable amount of TaC, ensure that the original heat resistance and wear resistance while also improving toughness of the alloy.

Ultrafine particles is also an increase of the base material but also improve the hardness of the material strength of the matrix method can. Ultrafine particles tungsten carbide hardness is generally 90-93HRA (higher than the average tungsten carbide 1.5-2HRA), and high-temperature hardness has been improved; the flexural strength of 2000-3500MPa, higher than the average tungsten carbide 600-80OMPa ; its toughness, chipping, even under low or intermittent cutting and other processing conditions are not easy to produce cutting edge chipping or breakage. WC grain size of fine grains generally 0.2-1.0μm, most of 0.5μm or less, a fraction to a few tenths of an ordinary tungsten carbide WC grain size. Furthermore, fine particles of the base material and the coating can also increase bonding area, to improve the bond strength, increased crack propagation resistance of the grain boundary, and thus it is possible to improve the ability of resistance to breakage tungsten carbide cutting tools.


 

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