论文部分内容阅读
利用粉末冶金热挤压技术制备短碳纤维增强镁合金复合材料。为了改善碳纤维与基体的润湿性,对碳纤维进行表面无钯化学镀镍处理。通过扫描电子显微镜(SEM)观察碳纤维化镀层以及碳纤维镁基复合体的形貌,通过超景深金相显微镜观察纤维在复合材料中的分布并对复合材料的挤压过程进行分析。结果表明:镀镍碳纤维能满足制备的要求并有利于纤维在复合体中的均匀分散,在含4.0%(质量分数)碳纤维的预制体采用压制压力为420MPa,烧结温度为550℃保温0.5h后,在480℃用280MPa的压力进行热挤压得到材料的力学性能最佳。
Preparation of Short Carbon Fiber Reinforced Magnesium Alloy Composites by Powder Metallurgy Hot Extrusion Technology. In order to improve the wettability of carbon fiber and matrix, the surface of the carbon fiber without palladium electroless nickel treatment. The morphology of the carbonized coatings and the carbon fiber magnesium matrix composites were observed by scanning electron microscopy (SEM). The distribution of the fibers in the composites was observed by the depth of field metallurgical microscope and the extrusion process of the composites was analyzed. The results show that the nickel-plated carbon fiber can meet the preparation requirements and is conducive to the uniform dispersion of the fiber in the composite body. The preform with 4.0% (mass fraction) carbon fiber is pressed at 420MPa and the sintering temperature is 550 ℃ for 0.5h , At 480 ℃ with 280MPa pressure hot extrusion material obtained the best mechanical properties.