摘要
利用放电等离子烧结技术制备了Ti/Al2O3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/Al2O3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Al2O3遭到轰击而产生放电离子,活化Al2O3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%、1002MPa、19.73MPa·m1/2和18.14GPa;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/Al2O3 composites prepared by Spark Plasma Sintering Technique is discussed, and the performances of the composites are studied. The result shows that Ti/Al2O3 composites sintering temperature is lowered, because Ti and Al2O3 form a conductivity network configuration which is liable to breakdown capacitor formed in sintering process to bombard Al2O3 and generate discharge ions activating Al2O3 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.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第A02期450-453,共4页
Rare Metal Materials and Engineering
基金
山东省自然科学基金(Y2006F53)
济南大学博士基金(B0514)
