Tungsten carbide (WC) is a compound composed of refractory metal tungsten and non-metallic carbon, which has the characteristics of high density, high melting point, high strength, high hardness, high temperature resistance, corrosion resistance, wear resistance and good electrical and thermal conductivity, so it is an ideal carbide tool material.
However, due to the problem of brittleness and poor toughness of simple WC powder, it is often necessary to add appropriate amount of binder such as cobalt (Co), nickel (Ni), chromium (Cr), molybdenum (Mo), titanium (Ti), copper (Cu) and other elements when making high comprehensive performance carbide tools.
Specifically, with WC powder as the hard phase and Co as the binder phase is more suitable for cutting tools. It has good thermal conductivity, which is good for cutting heat dissipation from the tip of the tool, reducing the tip temperature and avoiding overheating and softening of the tool tip; it has high flexural strength and impact toughness, which can effectively reduce the probability of chipping when cutting; it has excellent cutting resistance (far more than high-speed steel), and can grind a sharp edge.
cemented carbide blade with WC powder as the hard phase and Ni as the bonding phase is more suitable for corrosion resistant parts. Its corrosion resistance is stronger than that of tungsten and cobalt carbide tools, making it suitable for applications in environments with various corrosive media. In addition, WC-Ni cemented carbide seals are also suitable for applications in low temperature, high temperature, vacuum and high pressure.
The composed of WC, TiC and Co has the characteristics of high hardness, good heat resistance, high compressive strength, good oxidation resistance, poor thermal conductivity and so on, which is suitable for processing steel.
It should be noted that the specific physical indicators of hard alloy will change with the different ratio of raw materials. If a layer or multiple layers of carbide, carbide and other refractory hard compounds are sprayed on the surface of the hard alloy, the high wear resistance and high toughness of the alloy will be further compatible, so it is more suitable for high-speed cutting.
Post time: May-02-2023
