纳米Ni对Ti/Al_2O_3复合材料力学性能的影响

Impacts of Nano-Nickel on The Mechanical Properties of Ti/Al_2O_3 Composites

在烧结温度为1400℃、升温速率为20℃/min、保温时间为60 min的工艺条件下,采用真空热压烧结技术制备Ti/Al2O3金属陶瓷复合材料。研究掺加纳米Ni对材料力学性能的影响及强韧化机理。结果表明,纳米Ni的添加可以有效抑制Ti-Al2O3之间的界面反应,提高材料的力学性能,改善材料的物相组分;当掺入Ni的体积分数为3%时,材料的致密度为98.91%,弯曲强度为384.27 MPa、断裂韧性为8.02 MPa·m1/2、显微硬度为16.16 GPa。

Ti/Al2O3 composites were synthesized by vacuum hot-pressing sintering at 1 400 ℃ for 60 minutes at a rate of 20 ℃/min. The impacts of nano-nickel doping on the mechanical properties of Ti/Al2O3 composites and its strengthening and toughening mechanisms were discussed. The results show that the addition of nano-nickel inhibits the reaction between titanium and aluminum oxide,and improve the mechanical properties of material and phase compositions. When the addition of nano-nickel is 3 vol. %,the relative density,bending strength fracture toughness and micro-hardness are 98. 91%,384. 27 MPa,8. 02 MPa·m1/2,16. 16 GPa,respectively.