改性金属模具材料的研究

Study of Zirconia modified Metal-Ceramic Die Materials

以微米TiC、Ti N为主要原料,微米Y-Zr O2作为添加剂,微米Mo粉作为烧结助剂,采用热压烧结工艺制备了金属陶瓷模具材料。测试和分析了烧结样品的抗折强度、硬度以及断裂韧度等性能,采用SEM对最佳烧结样品的显微结构进行了分析。结果表明,最佳烧结温度为1 500℃,当添加50%Ti C、20%Ti N、10%Y-Zr O2以及20%Mo粉时,所制备金属陶瓷模具材料性能最佳,抗折强度为656 MPa,硬度为10.79 GPa,断裂韧度为11.16 MPa·m1/2。显微结构分析显示Y-Zr O2颗粒在基体材料晶界处起微裂纹增韧作用。

The metal ceramic die materials were fabricated by hot-pressing sintering technique with micron TiC and TiN as the main raw materials, micron Y-ZrO2 as additives, micron Mo as sintering additives. The properties of bending strength, hardness and fracture toughness were tested and analyzed, The microstrueture of the best sample was tested and analyzed by SEM. The results show that the best sintering temperature is 1500 ℃; when the contents of TiC is 50wt%, TiN is 20wt%, Y-ZrO2 is 10wt% and Mo powder is 20wt%, the prepared metal ceramic die material can achieve the best properties; and the bending strength, hardness and fracture toughness of the metal ceramic die material is 656 MPa, 10.79 GPa and 11.16 MPa· m^1/2, respectively. Microstructure analysis shows that the Y-ZrO2 plays a micron crack toughening role at the crystal interface.