Al_2O_3-SiO_(2(sf))/AZ91D复合材料的摩擦磨损性能

Friction and Wear Properties of Al_2O_3-SiO_(2(sf))/AZ91D Metal Matrix Composites

以硅酸铝短纤维作增强体,以磷酸铝作为预制体高温粘结剂,采用挤压浸渗法制备镁基复合材料。利用MM200磨损试验机,分别在10、30、50N的外加载荷和0.47和0.94m/s条件下,与硬度(HRC)为53的20Cr对磨环在干态条件下进行对磨,结果表明,在0.47m/s的滑行速度和10、30N的外加载荷条件下,复合材料的磨损机制基本上是单一的磨粒磨损;在0.47m/s的滑行速度和50N外加载荷条件下,复合材料在磨粒磨损的基础上附带有轻微的剥落磨损;在0.94m/s的滑行速度和50N外加载荷条件下,复合材料的摩擦磨损机制是以磨粒磨损为主并辅以轻微粘着磨损的复合磨损,此时,复合材料表现出相对较好的摩擦磨损性能。

Magnesium alloy matrix composites(MMCs) were fabricated by squeezing-infiltration casting with the perform made of crystallined aluminum silicate short fibers as reinforcement and aluminum phosphate as binder at high temperatures.Drying sliding friction and wear resistance of the MMCs were examined by means of MM200 wear tester(block-on-ring configuration) against a hardened alloy steel counterface with 53HRC under loads of 10,30 and 50N at 0.47 m/s and 0.92 m/s,and the wear morphology of the tested specimens was observed by SEM(scanning electronic microscope).The results indicate that wear mechanism of the MMCs is characterized by abrasive wear with loading 10 N and 30 N at 0.47m/s,while it is characterized by abrasive wear with slight flaking wear with loading 50 N at 0.47m/s,and it exhibits combined wear of abrasive wear with slight adhesive wear with loading 50 N at 0.94 m/s,increasing the wear resistance of the MMCs.