CAJ | 학술논문

分别以针刺编织预制体(2.5D)和三维编织预制体(3D)为增强体，采用化学气相沉积结合高温熔渗工艺制备2种不同预制体结构的C/C-SiC-ZrC复合材料。利用X射线衍射仪，扫描电镜和能谱分析仪等测试手段，对材料的微观结构进行分析，采用三点弯曲实验和压缩实验研究材料的力学性能，得出不同预制体对最终复合材料断裂性能的影响规律。结果表明：材料中的 SiC 与 ZrC 呈偏聚态分布，2.5D 复合材料的弯曲强度和压缩强度高达147.38 MPa，252.4 MPa；与3D复合材料相比，2.5D复合材料强度分别提高了192%和90.7%。这主要是由于2.5D复合材料纤维含量少，孔隙多，反应后密度较高所致。
분별이침자편직예제체(2.5D)화삼유편직예제체(3D)위증강체，채용화학기상침적결합고온용삼공예제비2충불동예제체결구적C/C-SiC-ZrC복합재료。이용X사선연사의，소묘전경화능보분석의등측시수단，대재료적미관결구진행분석，채용삼점만곡실험화압축실험연구재료적역학성능，득출불동예제체대최종복합재료단렬성능적영향규률。결과표명：재료중적 SiC 여 ZrC 정편취태분포，2.5D 복합재료적만곡강도화압축강도고체147.38 MPa，252.4 MPa；여3D복합재료상비，2.5D복합재료강도분별제고료192%화90.7%。저주요시유우2.5D복합재료섬유함량소，공극다，반응후밀도교고소치。
C/C-SiC-ZrC composites were fabricated by reactive melt infiltration using needling preform (2.5D) and 3-D braided preform (3D). The structure and morphology of the composites were characterized by XRD, SEM and EDS analysis. The mechanical properties of the materials were investigated by three point bending tests. The effect of different preform on fracture behavior of the composites was studied. The results show that the SiC and ZrC phases exhibit a segregated distribution in the composites. Compared with 3D composites, the flexural strength and compressive strength of 2.5D composites are 147.38 MPa and 252.4 MPa, increased by 192%and 90.7%. This is mainly caused by the lower fibre content, the higher density after reaction and the more porous of the 2.5D composites.