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Municipal engineering

Tunnel boring machine (TBM) cutter is the tooth of TBM, the service life of the cutter affects the construction progress and efficiency. In this study, the Ni-based tungsten carbide composite powder was deposited on the surface of the TBM cutter ring by laser cladding to improve the wear resistance. The microstructure of the coating was analyzed, the wear resistance was studied and compared with the substrate. A wear-resistant coating with low porosity was prepared on the surface of the 5Cr5MoSiV1 cutter ring, which has a good metallurgical bonding with the substrate. The main phases in the coating were γ-Ni, WC and W2C. Spherical WC and its decomposed WC and W2C small particles are widely distributed in the coating, effectively hindering the pressing and ploughing of hard rock particles, thereby improving the wear resistance of the coating. The calculated results of the volume loss before and after wear showed that the wear resistance of the cladding layer was about 7 times higher than that of the substrate.
Tungsten carbide is a hard material composed of a metal matrix composite where carbide particles act as the aggregate and a metallic binder serves as the matrix. It is one of the most successful composite engineering materials ever produced. Its unique combination of strength, hardness and toughness satisfies the most demanding applications.
Tungsten carbide is used in machining tough materials such as cast iron or steel, as well as in situations where other tools would wear away, such as mining tools and wear parts. Most of the time, carbide will leave a better finish on the part,and allow faster machining. Carbide tools can also withstand higher temperatures than standard high speed steel tools.