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通过真空浸渍和压力注射的工艺方法向三维针刺整体碳毡中引入了质量分数为50%的BN亚微米粉,采用PIP工艺,以含乙烯基的液态聚碳硅烷(LPVCS)为先驱体,制备了Cf/(BNp-SiC)复合材料,并对其性能及微观形貌进行了表征,与未加粉的Cf/SiC复合材料进行了对比。结果表明:BN粉的引入能有效缩短复合材料的制备周期,且对材料的力学性能影响较小。经过8次PIP工艺后,Cf/(BNp-SiC)复合材料开孔率仅为4.4%,Cf/SiC复合材料经9次PIP工艺后开孔率为6.5%。Cf/(BNp-SiC)复合材料抗弯强度达到269.6MPa,断裂韧性为10.26MPa·m1/2,Cf/SiC复合材料抗弯强度和断裂韧性分别为257.8MPa和13.51MPa·m1/2。
The BN submicron powder with the mass fraction of 50% was introduced into the three-dimensional needle-punched monolithic carbon felt by vacuum impregnation and pressure injection process. Using PIP process, the liquid polycarbosilane (LPVCS) The Cf / (BNp-SiC) composites were prepared and their properties and microstructure were characterized. Compared with the non-pulverized Cf / SiC composites. The results show that the introduction of BN powder can effectively shorten the preparation cycle of the composites and has little effect on the mechanical properties of the composites. After 8 PIP processes, the open porosity of Cf / (BNp-SiC) composites was only 4.4%, and that of Cf / SiC composites was 6.5% after 9 PIP processes. The flexural strength and fracture toughness of Cf / (BNp-SiC) composites reached 269.6MPa and 10.26MPa · m1 / 2 respectively. The flexural strength and fracture toughness of Cf / (BNp-SiC) composites were 257.8MPa and 13.51MPa · m1 / 2, respectively.