| Because of its high mechanical properties and excellent wear resistance, the aluminum manganese bronze is widely used in mechanical engineering field, and becomes an indispensable copper alloy to modern industry. This paper research on the aluminum manganese bronze whose main alloying elements is Al and Mn, as a substitute of tin bronze for the preparation of mud gun piston ring. In order to reduce the production cost of piston ring, through the composition design, preparation process, heat treatment and other means to further optimize the microstructure and properties of the aluminum manganese bronze. The paper’s contents are as followed:(1) According to the working condition of the piston ring, combined with the properties of tin bronze, design and conduct the preparation of the aluminum manganese bronze alloy.(2) Observe the microstructure of specimens with different Al, Mn content under casting and annealed conditions separately, and determine its hardness, tensile properties. Discuss the effect of Al, Mn content on the microstructure, hardness and mechanical properties, and give the best content.(3) Conduct the friction and wear experiment of the tin bronze and aluminum manganese bronze under constant load and speed. Comparative analysis of the friction and wear properties and wear mechanism.(4) Conduct the friction and wear experiment of the aluminum manganese bronze under different speed and load. Discuss the effect of the speed and load on friction and wear behaviour of the aluminum manganese bronze.The main conclusions were as followed:(1) With the increase of the content of Al, the phase of α and (α+γ2) reduced, the phase of β’ and γ2, increased. The hardness and strength increased, the elongation decreased. The effect of the content of Mn on microstructure is mainly reflected in the annealing process. The amount of the phase of (α+γ2) increased after annealing, which has a lower content of manganese. The hardness and strength increased, the elongation does not change significantly. (2) The aluminum manganese bronze that contents11.5%Al and6.4%Mn, annealing600℃for2hours and cooling with the furnace, has the best mechanical properties. And its performance is better than tin bronze, which can meet the performance requirements of piston ring conditions.(3) The aluminum manganese bronze that contents11.5%Al and6.4%Mn and after annealing treatment has the best performance of the friction and wear properties. The friction coefficient of aluminum manganese bronze is only0.351, the wear weight is0.124g, and the friction coefficient of the tin bronze is0.931, the wear weight is0.426g under the experimental condition of80N,80r/min.(4) Compared to speed, the effect of load on friction and wear properties is remarkable. The coefficient of friction and the wear quantity increase when the load increased. Minor scratch and fatigue wear is the main wear mechanism under low speed and load. However, it changes into oxidation wear, abrasive wear, and fatigue wear with high speed and heavy load. |
