中文摘要：

利用旋转式冲蚀试验机对 QAl9-4铝青铜在含 SiC 沙粒的3．5％NaCl 中的冲蚀磨损行为进行了研究.结果表明，在介质流速小于28．3 m/s 时，失重量随介质流速的增加而增大；失重随沙粒粒径变化有明显的转折点，在粒径为0．3 mm时材料流失最为显著.沙粒粒径变化引起 QAl9-4铝青铜冲蚀磨损行为的变化，小粒径时以犁削磨损为主，大粒径时锻打挤压作用增强的同时犁削磨损作用减弱.

英文摘要：

The erosion of QAl9-4 aluminum bronze has been investigated in 3.5% NaCl including SiC particles by using a rotating disk system.The results show that the mass loss increases with increasing the flow velocity when the velocity is lower than 28.3 m/s,and the mass loss vs particle size exhibits an transition point beyond which the mass loss decreases obviously,which is 0.3 mm.The variations of particle size can lead to the change of the erosion behavior of QAl9-4 aluminum bronze samples.The failure of samples is mainly attributed to the ploughing wear under condition of little particles,however,the forging and extrusion effect improves and the ploughing wear decreases under condition of big particles.