SiC泡沫陶瓷增强ZL205A铝合金复合材料的制备与性能研究

Preparation and mechanical properties of ZL205A alloy-infiltrated SiC foam ceramic composites

摘要:

本实验通过挤压浸渗工艺成功制备了SiC泡沫陶瓷增强ZL205A铝合金复合材料,并研究了不同孔隙率的泡沫陶瓷增强相对复合材料性能的影响。通过微观结构分析,制备的复合材料两相间结合紧密,没有裂纹及其他缺陷产生。多孔陶瓷作为增强相可以有效地细化ZL205A合金的晶粒,多孔陶瓷孔隙率的降低,孔结构越小,合金晶粒越细小。对制备的复合材料进行力学性能测试,复合材料的硬度和抗弯强度最高能够达到127.6HV和415MPa。对制备的复合材料进行摩擦磨损测试,结果表明,连续陶瓷相的存在将铝基体严重的粘着磨损和剥落磨损转变为较轻的磨粒磨损,极大提升了复合材料的摩擦磨损性能,为其用于耐磨领域提供了理论依据。

Abstract:

ZL205A alloy-infiltrated SiC foam ceramic composites are prepared through extrusion infiltration process. The effect of different porosity of SiC foam ceramic on the properties of composites is investigated. The SiC foam ceramics are tightly combined with the ZL205A matrix material, and there are few cracks and other defects can be observed. The SiC foam ceramic as the reinforcing phase refines the grains of the ZL205A matrix phase. The pore structure and the grain size are finer and smaller with decreasing of the reinforcing phase porosity. The mechanical properties of the ZL205A alloy-infiltrated SiC foam ceramic composites are investigated. The hardness and flexural strength of the composites are 127.6HV and 415MPa, respectively. The wear resistance of the composites is also investigated, the results demonstrate that the addition of ceramic reinforcing phase can effectively transform the severe adhesive wear and spalling wear of the matrix phase into lighter abrasive wear, which greatly improves the friction and wear properties of the composite.