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分别以LJ1、LJ2、YJ、ZJ 4种焦炭颗粒作为增强体,CVD炭作为基体,利用TCVI设备制备出了焦炭颗粒增强热解炭基(焦炭颗粒/热解炭)复合材料。并从其力学性能着手,使用金相显微镜分析其显微结构,采用扫描电镜观察其断口微观形貌,并结合载荷-位移曲线综合分析其断裂方式及机理。结果表明:4种焦炭颗粒/热解炭复合材料中,LJ1和ZJ焦炭颗粒沉积前后密度与质量变化最大,其质量分别增加57.4%和64.3%;焦炭颗粒/热解炭复合材料微观组织结构为各向异性;LJ2焦炭颗粒/热解炭复合材料轴向和径向的压缩强度分别为203.7 MPa和176.3 MPa,在4种焦炭颗粒/热解炭复合材料中强度最高;4种焦炭颗粒/热解炭复合材料压缩断裂方式为脆性断裂,LJ2焦炭颗粒/热解炭复合材料和YJ焦炭颗粒/热解炭复合材料主要是因其内部焦炭颗粒孔洞的应力集中造成断裂,LJ1焦炭颗粒/热解炭复合材料和ZJ焦炭颗粒/热解炭复合材料主要沿其焦炭颗粒的层片断裂。
Four kinds of coke particles (LJ1, LJ2, YJ and ZJ) were used as reinforcements and CVD charcoal was used as matrix to prepare a coke particle reinforced pyrocarbon (coke pellet / pyrogenic carbon) composite by TCVI equipment. The microstructure of the fracture surface was analyzed by metallographic microscope. The microstructure of the fracture surface was observed by scanning electron microscopy. The fracture mode and mechanism were analyzed by combining the load - displacement curve. The results show that the density and mass of LJ1 and ZJ coke particles before and after deposition vary greatly among the four kinds of coke particles / pyrolytic carbon composites, with the mass increasing 57.4% and 64.3% respectively. The microstructure of coke particles / pyrolytic carbon composites is Anisotropy. The axial and radial compressive strengths of LJ2 coke / pyrolytic carbon composites were 203.7 MPa and 176.3 MPa, respectively, and were the highest among the four coke particles / pyrolytic carbon composites. The coke particles / The compression fracture mode of the carbon composites is brittle fracture. The LJ2 coke particles / pyrolytic carbon composites and the YJ coke particles / pyrolytic carbon composites are mainly caused by the stress concentration in the pores of the coke particles. The LJ1 coke particles / pyrolysis The carbon composite and ZJ coke / pyrolytic carbon composites are mainly broken along the layers of coke particles.