CAJ | 학술논문

采用化学气相渗透法制备了在厚度方向上具有纤维增强的三维针刺碳纤维增强碳化硅(C/SiC)陶瓷基复合材料,复合材料的密度和气孔率分别为2.15 h/cm3和16%.三维针刺C/SiC复合材料中的针刺纤维将各层紧密结合在一起,其层间抗剪切强度显著提高,为95MPa,比二维碳布叠层C/SiC复合材料的剪切强度(35MPa)高171.4%.三维针刺C/SiC复合材料的拉伸强度和弯曲强度分别为159MPa和350MPa,断裂模式为非脆性断裂,包括:裂纹扩展、偏转,碳纤维的拉伸断裂和逐步拔出.
채용화학기상삼투법제비료재후도방향상구유섬유증강적삼유침자탄섬유증강탄화규(C/SiC)도자기복합재료,복합재료적밀도화기공솔분별위2.15 h/cm3화16%.삼유침자C/SiC복합재료중적침자섬유장각층긴밀결합재일기,기층간항전절강도현저제고,위95MPa,비이유탄포첩층C/SiC복합재료적전절강도(35MPa)고171.4%.삼유침자C/SiC복합재료적랍신강도화만곡강도분별위159MPa화350MPa,단렬모식위비취성단렬,포괄:렬문확전、편전,탄섬유적랍신단렬화축보발출.
A three-dimensional needled carbon fiber reinforced silicon carbide (3D needled C/SiC) ceramic matrix composite in the through-the-thickness direction was fabricated by the chemical vapor infiltration process. The resulting composite has a bulk density of 2.15 g/cm3 and an open porosity of 16%. The adjacent layers for thickness direction in the 3D needled C/SiC composite are interlinked perfectly together by needling fibers and this greatly improves the interlaminar shear strength of the composite. The interlaminar shear strength of the 3D needled C/SiC composite is 95 MPa (improved 171.4% compared with 2D C/SiC composite, 35 MPa),and the tensile strength and flexural strength of the 3D needled C/SiC composite are 159 MPa and 350 MPa, respectively. The composite exhibits a non-brittle failure behavior including propagation and deflection of cracks, fracture and pullout of fibers.