碳纤维对Ti/Al2O3复合材料力学性能的影响

Effect of Carbon Fiber on the Mechanical Property of Ti/Al2O3 Composites

摘要:

采用真空热压烧结技术制备了Ti/Al2O3复合材料，在烧结温度1420℃，保温时间60min，升温速率10℃/min（0-1200℃）和5℃/min（1200-1420℃）的烧结工艺下，研究了掺加碳纤维对Ti/Al2O3复合材料力学性能的影响。实验结果表明：碳纤维的掺入优化了复合材料的断裂模式，对Ti/Al2O3复合材料的力学性能有较为明显的影响。当掺入碳纤维体积分数为1%时，Ti/Al2O3复合材料的力学性能达到最佳，相对密度为97.62%，显微硬度为（16.6?.32）GPa，弯曲强度为（381?1.25）MPa，断裂韧性为（7.2?.19）MPa.m 1/2。

Abstract:

Ti/Al2O3 composites were synthesized by vacuum hot-pressing sintering, using the following sintering process as sintering temperature is 1420℃, time of heat preservation is 60 minutes, heating rate is 10℃ / min (0-1200℃) and 5℃ / min (1200℃-1420℃). The effects of carbon fiber on the mechanical property of Ti/Al2O3 composites are discussed. The results indicate that the carbon fiber can obviously effect the mechanical property of Ti/Al2O3 composites. When the carbon fiber content is 1.0 vol %, the relative density, micro-hardnessare,flexural strength and fracture toughness of the composite reach the maximum values of 97.62%, （16.6?.32）GPa , （381?1.25）GPa and （7.2?.19）MPa.m 1/2, respectively, and the fracture mode of the composites were optimised.