ZrC/Cr2AlC复合材料的微观结构及力学性能研究

Cr₂AlC是MAX相家族中具有代表性的三元层状碳化物, 它兼具金属和陶瓷的特性, 有导电、耐腐蚀、抗氧化等优异性能。为进一步提高Cr₂AlC的综合性能, 本研究以ZrC为增强相, 利用热压烧结技术制备了ZrC/Cr₂AlC复合材料, 探讨了增强相含量(10vol%~20vol%)对材料力学性能的影响。结果表明: 10vol% ZrC/Cr₂AlC复合材料的弯曲强度和硬度分别为715 MPa和7 GPa。相比Cr₂AlC材料的强度(398 MPa)和硬度(3.4 GPa), 复合材料的强度和硬度提高幅度分别为80%和106%。采用扫描电子显微镜对材料的微观结构进行了分析, 阐明了复合材料具有较高性能的原因。本研究为拓宽Cr₂AlC材料的应用领域奠定了基础。

Fabrication and Mechanical Property of ZrC/Cr2AlC Composites

Cr₂AlC is a representative material in MAX phase family due to its combination of metallic and ceramic properties such as high electrical conductivity, high thermal conductivity, resistance to corrosion, good oxidation resistance. To further improve performance of Cr₂AlC, ZrC as a reinforcement was selected to reinforce Cr₂AlC matrix composites by hot pressing technique. Influence of ZrC content on the mechanical property of ZrC/Cr₂AlC composites has been investigated. The results showed that 10vol% ZrC/Cr₂AlC composite improved flexural strength (715 MPa) and Vickers hardness (7 GPa) by 80% and 106%, respectively, as compared with those of pure Cr₂AlC material. Date from this study indicate that Cr₂AlC MAX possesses broaden application potential.