分别采用纳米SiC晶须(SiCW)、SiC颗粒(SiCP)及SiCW与SiCP共同增韧ZrB2陶瓷,在1950℃、20 Mpa压力、氩气气氛下热压烧结制备了致密的SiC/ZrB2陶瓷材料.研究了SiCW和SiCP的添加量对于SiC/ZrB2陶瓷材料的显微结构、力学性能的影响,并分析了SiCW和SiCP对ZrB2陶瓷力学性能影响的协同作用和增韧机制.结果表明:含15 vol%SiCW的复合材料的韧性达到8.08 Mpa·m1/2,含15 vol%SiCP的复合材料的韧性达到8.515MPa·m1/2,共同添加15 vol%SiCW和15 vol%SiCP的复合材料的韧性最高达到9.03 Mpa·m1/2.SiC/ZrB2复合材料强度和韧性提高的原因在于SiCW和SiCP抑制ZrB2晶粒长大,促进ZrB2的致密化,此外,SiCW和SiCP的协同作用也有助于材料韧性的提高.
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