利用放电等离子烧结技术制备了Ti/Al_2O_3复合材料,并探讨了其烧结机理,对复合材料性能进行测试.结果表明,Ti/Al_2O_3导电网络结构的形成,有利于在烧结过程中形成的"电容器"瞬间击穿,使Al_2O_3遭到轰击而产生放电离子,活化Al_2O_3晶粒,降低烧结温度;当Ti 含量为40%(体积分数,下同)时复合材料的相对密度、弯曲强度、断裂韧性和显微硬度分别为99.74%、1002 MPa、19.73 MPa·m~(1/2)和18.14 GPa;裂纹的桥联、偏转是试验材料力学性能得以提高的主要原因.
The sintering mechanism of Ti/Al_2O_3 composites prepared by Spark Plasma Sintering Technique is discussed, and the performances of the composites are studied. The result shows that Ti/Al_2O_3 composites sintering temperature is lowered, because Ti and Al_2O_3 form a conductivity network configuration which is liable to breakdown capacitor formed in sintering process to bombard Al_2O_3 and generate discharge ions activating Al_2O_3 particles. The density, flexural strength, fracture toughness and Vickers-hardness of the composites can reach 99.74%, 1002 MPa, 19.73 MPa·m~(1/2) and 18.14 GPa respectively, when the content of Ti is 40%. The mechanical properties were enhanced mainly because of the crack bridging and deflection.
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