PIP工艺制备SiC晶须增强SiC_(f)/SiC复合材料的性能  

Performance of SiC whisker reinforced SiC_(f)/SiC composites fabricated by PIP

作　　者：姜卓钰 吕晓旭 周怡然 齐哲 高晔 赵文青 焦健 JIANG Zhuoyu;LYU Xiaoxu;ZHOU Yiran;QI Zhe;GAO Ye;ZHAO Wenqing;JIAO Jian(National Key Laboratory of Advanced Composites,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;Surface Engineering Division,AECC Beijing Institute of Aeronautical Materials,Beijing 100095,China;School of Materials Science&Engineering,Beijing Institute of Technology,Beijing 100081,China)

机构地区：[1]中国航发北京航空材料研究院先进复合材料国防科技重点实验室,北京100095 [2]中国航发北京航空材料研究院表面工程研究所,北京100095 [3]北京理工大学材料学院,北京100081

出　　处：《航空材料学报》2021年第2期82-88,共7页Journal of Aeronautical Materials

基　　金：国家科技重大专项(2017-VI-0007-0077)。

摘　　要：以不同界面层厚度的SiC纤维为增强相,采用先驱体浸渍裂解工艺(PIP)制备SiC_(f)(PyC)/SiC复合材料,并在复合材料基体中引入SiC晶须,对其性能进行研究。结果表明:热解碳(PyC)界面层厚度约为230 nm时,SiC纤维拔出明显,SiC_(f)/SiC复合材料拉伸强度、弯曲强度和断裂韧度分别达到192.3 MPa、446.9 MPa和11.4 MPa•m^(1/2);在SiC_(f)/SiC复合材料基体中引入SiC晶须后,晶须的拔出、桥连及裂纹偏转等增韧机制增加了裂纹在基体中传递时的能量消耗,使复合材料的断裂韧度和弯曲强度分别提高了22.9%和9.1%。SiC_(f)/SiC composites with the polycarbosilane and silicon carbide fiber of different pyrolytic carbon(PyC)interphase thicknesses as the reinforcement phase were fabricated by a polymer impregnation and pyrolysis(PIP)method.And SiC whisker was introduced into the SiC_(f)/SiC composites to further improve its performance.It is found that the mechanical properties of SiC_(f)/SiC composites have outstanding tensile strength,fracture toughness and flexural strength of 192.3 MPa,446.9 MPa and 11.4 MPa•m^(1/2),when the PyC interphase thickness is about 230 nm.After the introduction of SiC whisker,into the SiC_(f)/SiC composite matrix,the toughening mechanisms such as whisker pull-out,whisker bridging and crack deflection increase the energy consumption when the crack is transferred in the matrix,and the fracture toughness and bending strength of the composite are increased by 22.9%and 9.1%respectively.

关 键 词：碳化硅 复合材料 SIC晶须 力学性能 

分 类 号：TB332[一般工业技术—材料科学与工程]