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研究无压烧结条件下原位合成工艺对ZrB2/B4C陶瓷复合材料的烧结致密化、力学性能、显微组织的影响.结果表明材料的密度随着烧结温度的增加和保温时间的延长先增加后降低,在烧结温度2060℃,保温30min时,ZrB2/B4C复合材料的相对密度可达93.2%;材料的硬度随着温度的升高而增大,在2070℃时达到最大值;材料的断裂韧性则随着温度的升高呈现下降趋势,从2000℃时的4.04MPa.m1/2下降到2060℃时的2.36MPa.m1/2.
The sintering density, mechanical properties and microstructure of ZrB2 / B4C ceramic composite under in-situ sintering without pressure sintering were studied.The results show that the density of the material increases with the increase of sintering temperature and the holding time The relative density of ZrB2 / B4C composites reaches 93.2% at the sintering temperature of 2060 ℃ and 30min. The hardness of the composites increases with increasing temperature and reaches the maximum at 2070 ℃. The fracture toughness Then decreases with the increase of temperature, from 4.04MPa.m1 / 2 at 2000 ℃ to 2.36MPa.m1 / 2 at 2060 ℃.