Influence of Refiner on the Properties and Microstucutures of High-tin Wear-resisting Cu-Sn-Pb-Ni Alloy

摘要

According to the high-tin wear-resisting Cu-Sn-Pb-Ni alloy which the tin contents are 9～11%, the alloy casting were prepared by adding 0.5% refiner in melting precess and pouring in metal mold. The density, hardness, strength and elongation of alloy castings which adding refiner in melting process or not were tested and the casting mircostructure was analyzed. The results show that the density and hardness of Cu-Sn-Pb-Ni alloy casting prepared by adding refiner in melting process are 8.9083g/cm~3 and 113HB separately, the strength and elongation are 314.7MPa and 32.7% respectively, comparison with the strength and elongation of non-refiner are 252MPa and 7.3% separately, they were increased by 24.9% and 348% respectively. The dendrite structure which are mainly α solid solution and eutectoid(α+δ) of casting prepared by non-refiner is relatively obvious, The grain are obviously refined and the distribution of lead simple substance phase are more dispersed among the grain and grain boundary by adding refiner in melting process.