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采用真空热压工艺制备ZrO2/Ti(C7N3)纳米陶瓷工模具材料,并研究热压工艺参数对材料力学性能和微观结构的影响。结果表明:当材料组分确定时,热压工艺参数对力学性能的提高与微观结构的改善起关键作用。在本研究的实验条件下,当烧结温度为1500℃、保温时间为30min、压力为30MPa时,ZrO2/Ti(C7N3)纳米陶瓷工模具材料的综合力学性能较好,其抗弯强度、断裂韧性和硬度分别为958MPa、7.48MPa·m1/2和13.09GPa。但对应单一力学性能的最优工艺参数有所不同。力学性能提高的原因在于热压工艺参数所导致的材料微观结构的改善。合适的工艺参数可使纳米陶瓷工模具材料的断裂模式转变为穿晶/沿晶断裂模式,有利于材料的增韧补强。
The ZrO2 / Ti (C7N3) nano-ceramic mold material was prepared by vacuum hot pressing process, and the effect of hot pressing process parameters on the mechanical properties and microstructure of the material was studied. The results show that when the material composition is determined, the hot pressing process parameters play a key role in improving the mechanical properties and improving the microstructure. Under the experimental conditions of this study, the comprehensive mechanical properties of ZrO2 / Ti (C7N3) nano-ceramic mold material were better when the sintering temperature was 1500 ℃, the holding time was 30min and the pressure was 30MPa. The flexural strength, fracture toughness And hardness were 958MPa, 7.48MPa · m1 / 2 and 13.09GPa respectively. However, the optimal mechanical parameters corresponding to a single mechanical properties are different. The reason for the improvement in mechanical properties is the improvement of the microstructure of the material caused by the hot-pressing process parameters. Appropriate process parameters can change the fracture mode of nano-ceramic mold material into transcrystalline / intergranular fracture mode, which is good for toughening and strengthening of materials.