【摘要】 利用挤压铸造,采用正交试验和极差分析法优化了Al2O3和C短纤维混杂增强ZL109金属基复合材料中纤维的加入量和制备工艺参数。结果表明:当Al2O3体积分数为12%时,复合材料的抗拉强度和耐磨性最佳;复合材料的抗拉强度随着C纤维含量的增加略有下降,但耐磨性逐渐增加。当压力大于50MPa时,压力变化对复合材料抗拉强度和耐磨性影响不大。预制块预热温度较低和浇注温度较高时,复合材料的抗拉强度和耐磨性能较低。优化结果为:Al2O3短纤维体积分数12%、C短纤维体积分数4%、挤压压力110MPa、预制块预热温度400～450℃、浇注温度720～770℃。更多还原

【Abstract】 ZL109 hybrid metal matrix composites reinforced by alumina and carbon short fibres were fabricated by squeeze casting. Orthogonal experiment and extremum difference analysis were used in optimisation of reinforcing fibres volume fractions and technique parameters. The results show that tensile strength and wear resistance of composites are optimum at alumina volume fraction 12%. Tensile strength of composites decreases slightly and wear resistance increases with the increase of carbon fibre content. The effect of squeeze pressure on tensile strength and wear resistance of composites is not significant when pressure is above 50MPa. The tensile strength is low and wear resistance is poor when the preheated temperature of prefabricated section is low and pouring temperature is high. Optimising results are alumina fibre volume fraction 12% carbon fibre volume fraction 4%, squeeze pressure 110MPa, the preheated temperature of prefabricated section 400～450℃ and pouring temperature 720～770℃.更多还原