Copper tungstate produced from tungsten-containing waste as addition to antifriction material
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The paper examines the use of tungsten-containing waste to develop a copper-based microheterogeneous antifriction material. The effect of copper tungstate CuWO4 on the tribotechnical properties of antifriction material Cu–Sn–CuWO4–MoS2 is analyzed at a pressure between 1.25 and 17.5 MPa and sliding speeds of 0.5 and 1.0 m/sec with liquid lubrication. It is established that the composite antifriction material Cu–Sn–CuWO4–MoS2 can perform up to 17.5 MPa at a sliding speed of 0.5 m/sec and up to 12.5 MPa at 1 m/sec. The antifriction composite Cu–9 Sn–7.5 CuWO4–5 MoS2 has the optimal friction coefficient (0.135–0.01) and wear (6.0–3.1 μm/km) between 1.25–12.5 MPa under the above conditions and can perform up to 150°C. When Cu–Sn–CuWO4–MoS2 is sintered in hydrogen, CuWO4 decomposes and reduces to pure metal, and tungsten particles reinforce the matrix. The antifriction material Cu–Sn–CuWO4–MoS2 is microheterogeneous. The load-bearing component (matrix) represents an α-solid solution of tin in copper. Fine tungsten particles that are uniformly distributed in the matrix reinforce it and improve the bearing capacity of the material. Inclusions of molybdenum disulphide contribute to the formation of secondary structures on the friction surface and decrease the friction coefficient.
Keywordscopper tungsten tin copper-based composite antifriction material alloying elements strengthening microheterogeneous structure pressure sliding speed temperature friction coefficient wear
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