RTM成型工艺对C_f/SiBCN陶瓷基复合材料性能的影响

Effect of RTM Process on the Properties of C_f/SiBCN Ceramic Matrix Composites

采用流变仪研究了聚硼硅氮烷作为RTM树脂的成型工艺性能,进而采用RTM工艺成型出复合材料坯体,再经过重复的浸渍-常压裂解工艺制备了Cf/SiBCN陶瓷基复合材料,详细研究了RTM成型缺陷对复合材料的厚度、密度以及力学性能等方面的影响。结果表明:聚硼硅氮烷完全满足RTM成型工艺对流变性能的要求;RTM成型缺陷会进一步加剧复合材料的膨胀,使复合材料的厚度明显增大;同时会降低浸渍裂解前期复合材料的密度;最终复合材料的抗弯强度和模量均略有降低。

The forming process performance of polyborosilazane as RTM resin was investigated using rheometer,and the green composite preforms were further formed using RTM process,then the Cf/SiBCN ceramic matrix composites were fabricated via repeated impregnation-atmospheric pressure pyrolysis.Furthermore,the effect of RTM forming defects on thickness,density and mechanical properties of ceramic matrix composites was studied in detail.The results show that the polyborosilazane fully meets the requirements of RTM forming process to rheological properties.RTM forming defects will further increase the expansion of composites,and result in the obvious increase of the thickness of composites,meanwhile decrease the density of composites at the stage of pre-impregnation and pyrolysis,and finally the bending strength and modulus of ceramic matrix composites are also slightly decreased.