纳米氧化锆增韧氧化铝基陶瓷刀具材料的研究

Study on Ceramic Tool Material with Nano-scale Zirconia Toughening Alumina Matrix

利用纳米氧化锆的相变增韧和纳米颗粒的增韧作用,提高了氧化铝基体的综合力学性能。在氧化铝基体中添加不同含量的纳米3Y-ZrO2,纳米ZrO2含量为15wt%的A15Z材料综合力学性能达到最好(抗弯强度766.74MPa、断裂韧度6.13MPa·m1/2、维氏硬度18.32GPa),表明添加纳米氧化锆的复合刀具材料的力学性能远远超过单相氧化铝材料。

By adding the nano-scale zirconia into the micron-scale alumina matrix, the mechanical properties of ceramic tool material were improved by means of the transformation toughening mechanism of zirconia and toughening effect of nano-scale grains. When different contents of nano-scale 3Y-ZrO2 were added into alumina matrix, the ceramic tool material A15Z with a content of 15wt% nano-scale zirconia have optimal mechanical properties, its flexural strength, fracture toughness and Vickers hardness are 766.74MPa, 6.13MPa·m^1/2, 18.32GPa respectively. It suggests that the mechanical properties of complex-phase alumina material are far better than that of single-ohase alumina material.