硅酸盐学报
粤语谚语· 144 ·2008年
三维针刺C/SiC复合材料的结构特征和力学性能
郭友军，聂景江，徐永东，成来飞
(西北工业大学，西安 710072)
操场英语怎么说
我同学摘要：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2.15g/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。自然数符号
关键词：三维针刺；碳/碳化硅复合材料；结构特征；力学性能
中图分类号：TB33 文献标识码：A 文章编号：0454–5648(2008)02–0144–06
MICROSTRUCTURE AND MECHANICAL PROPERTIES OF THREE-DIMENSIONAL
NEEDLED C/SiC COMPOSITE
GUO Youjun，NIE Jingjiang，XU Yongdong，CHENG Laifei上杉和也
(Northwestern Polytechnical University, Xi'an 710072, China)
Abstract: 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 2.15g/cm3 and an open porosity of 16%. The adjacent layers for thickness direction in the 3D needled C/SiC composite are inter-linked perfectly together by needling fibers and this greatly improves the interlaminar shear strength of the composite. The interlami-nar shear strength of the 3D needled C/SiC composite is 95MPa (improved 171.4% compared with 2D C/SiC composite, 35MPa), and the tensile strength and flexural strength of the 3D needled C/SiC composite are 159MPa and 350MPa, respectively. The com-posite exhibits a non-brittle failure behavior including propagation and deflection of cracks, fracture and pullout of fibers.
Key words: three dimensional needled; carbon fiber reinforced silicon carbide composites; microstructure; mechanical property
The three-dimensional (3D) needled carbon perform is a novel reinforced body developed in recent years.[1–2] The perform can be prepared with a simple process at low cost, and has excellent performance; particularly, it has high interlaminar shear strength. The perform can be ud to fabricate veral types of composites with differ-ent shapes (i.e., flat, cylindrical, conical, and bell, etc) and various thickness, from 1 to 100mm.[2] As a result, the needled perform has been widely applied to produce carbon fiber reinforced carbon (C/C) and carbon fiber reinforced silicon carbide (C/SiC) composites.[1–4] The C/SiC composites have excellent properties such as ex-cellent mechanical properties, good oxidation and abla-tion resistance[5], and excellent braking performance, with a low wear rate and lower nsitivity to surround-ings and oxidation.[4,6–8] The C/SiC composites overcome some disadvantages of C/C composites; therefore, the C/SiC composites have great potential application in ad-vanced braking systems[6–8] and propulsion systems[9–12] such as combustors of scramjets, throat and exit cones for solid rocket nozzles and hot gas valves or large size exit cones for liquid rocket engines.
To improve the interlaminar de-bonding resistance, a needled perform, Noveltex, was developed in France by the SEP (Societe Europeenne de Propulsion, now named Snecma) at the end of the 1970s.[12] Novoltex performs are
收稿日期：2007–09–01。修改稿收到日期：2007–09–12。基金项目：国家自然科学基金(50672076)资助项目。
第一作者：郭友军(1955—)，男，工程师。
通讯作者：聂景江(1978—)，男，博士。Received date:2007–09–01. Approved date: 2007–09–12. First author:GUO Youjun (1955–), male, engineer.
致三级跳运动员E-mail: guoyoujun@nwpu.edu
Correspondent author: NIE Jingjiang (1978–), male, doctor. E-mail: 苹果平板怎么截屏
第36卷第2期2008年2月
硅酸盐学报
JOURNAL OF THE CHINESE CERAMIC SOCIETY
Vol. 36，No. 2炸酱面怎么做好吃
February，2008
