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将热速处理、混合添加剂、挤压铸造三种工艺结合起来,浇注出的新型高强锌铝合金ZA27,ZA12,ZA35成份偏析减少,组织细化,缩松消除,机械性能大幅度提高。在不同的载荷速度下,ZA27,ZA12,ZA35的耐磨性能分别是7QSn6—6—3的4~23.3倍,17.6%~3.2倍,6,5~14.6倍。利用扫描电镜、透射电镜、X射线电镜、光学显微镜等对ZA合金的成分、组织、磨面、磨屑形貌进行分析,得知ZA合金耐磨主要是由于软基体α、βp相上分布着硬质富铜。相;综合工艺提高ZA合金的机械性能也提高耐磨性能;摩擦时表面受热受压塑性变形,缺陷扩散导致磨损形成;ZA合金在润滑时磨损形式主要是粘着,其次是犁削;干摩擦时的磨损形式主要是粘着与犁削同时进行,并伴随着碾压。数据及图象分析表明,新型高强锌铝合金减摩耐磨性能良好,是一种很有希望代替铜合金的廉价耐磨材料,值得推广“和发展。
The heat treatment, mixed additives, squeeze casting three kinds of processes combined with the pouring of the new high-strength zinc aluminum alloy ZA27, ZA12, ZA35 component segregation reduction, refinement, shrinkage elimination, a substantial increase in mechanical properties. The wear resistance of ZA27, ZA12 and ZA35 is 4 ~ 23.3 times, 17.6% ~ 3.2 times and 6,5 ~ 14.6 times of that of 7QSn6-6-3 under different load velocities. The composition, microstructure, wear surface and wear debris morphology of ZA alloy were analyzed by scanning electron microscopy, transmission electron microscopy, X-ray electron microscopy and optical microscopy. The wear resistance of ZA alloy was mainly due to the distribution of α, βp phase on soft matrix Hard copper-rich. The mechanical properties of ZA alloy also improve the wear resistance, the plastic deformation when the surface is heated and the wear caused by the defect diffusion. The wear forms of ZA alloy are mainly adhesion when lubrication, followed by plow, The wear form is mainly sticking and plow cutting at the same time, accompanied by rolling. Data and image analysis show that the new high-strength zinc-aluminum alloy has good anti-friction and wear-resistant properties and is a promising wear-resistant material instead of copper alloy. It is worth promoting and developing.