负压实型铸造法制备金属基复合材料的工艺研究

运用负压实型铸造法（Ｖ－ＥＰＣ）成功地制备了钢纤维增强铝基复合材料，对所制备的试样进行了力学性能测试并观察了微观组织和断口形貌。试验表明，机械固结法可用于制备纤维预制件，最佳浇注工艺参数为浇注温度７３０～７４０℃，浇注速度３～４ ｋｇ／ｓ，铸型负压度－ ０．０２５～－ ０．０４０ ＭＰａ。分析了气化模制备的影响因素以及浇注工艺参数对复合材料性能的影响。

Study on Technology of Metal Matrix Composites Prepared by V-EPC Method

Steel fiber/aluminum matrix composites are prepared by V EPC method which is usually used for casting normal metals and alloys. One of the most important evaporative patterns is that the surface treated (zinc coating) steel fibers are mechanically fixed into EPMMA EPS foam. This kind of pattern is then buried in dry sands (without binder), and the melted aluminum is cast in the evaporative pattern. The mechanical pro perties of the prepared samples are tested, and the microstructure and the fracture surfaces of the samples are also observed. The results show that the mechanical fixing method can be used for fiber preform. The optimum casting speed is 3~4 kg/s and the vaccum degree is -0.025~-0.040 MPa. The influencing factors of pattern preparing and the effect of casting parameters on the properties of FRM are also analysed.