Abstract
The cemented carbide of natural gas throttle valve has serious erosion phenomenon in natural gas exploitation. The titanium nitride (TiN) coating on cemented carbide is an effective method to prevent failure of cemented carbide. Three different processes physical vapor deposition (PVD), chemical vapor deposition (CVD) and plasma chemical vapor deposition (PCVD) are used to deposit TiN coating on cemented carbide. The experiments carried on the scanning electron microscopy, the digital micro hardness tester and scratch tester. The results indicate TiN coating deposited by PVD has characteristics of dense structure, uniform thickness, smooth surface. The coating hardness from big to small: PVD > PCVD > CVD. The coating elasticity modulus from big to small: PCVD > CVD > PVD. The bonding force between coating and substrate from big to small: PVD > CVD > PCVD. The results demonstrate that TiN coating deposited by PVD mechanical properties are superior to TiN coating deposited by CVD and PCVD.
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