高温循环下SiC-C/SiBCN复合材料的力学性能研究  

Mechanical Properties of SiC-C/SiBCN Composites Under Thermal Cycling

作　　者：张宝鹏 吴朝军 于新民[1] 刘伟 李晓东[1] Zhang Baopeng;Wu Chaojun;Yu Xinmin;Liu Wei;Li Xiaodong(Aerospace Institute of Advanced Materials&Processing Technology,Beijing 100074,China;The Sixth Representative Office of Rocket Army in Beijing,Beijing 100074,China)

机构地区：[1]航天特种材料及工艺技术研究所,北京100074 [2]火箭军驻北京地区第六代表室,北京100074

出　　处：《稀有金属材料与工程》2021年第5期1673-1678,共6页Rare Metal Materials and Engineering

摘　　要：采用化学气相沉积(CVD)结合前驱体浸渍裂解(PIP)技术制备了SiC涂层的C/SiC和C/SiBCN复合材料,研究了高温循环氧化对2种复合材料弯曲性能的影响。结果表明,与SiC-C/SiC相比,SiC-C/SiBCN复合材料的平均室温抗弯曲强度约为605 MPa,增幅达到126.6%。在1000和1200℃循环3次后,SiC-C/SiBCN的剩余抗弯曲强度分别为417和342 MPa,强度保留率分别为68.9%和56.5%,显著优于SiC-C/SiC复合材料。与PIP SiC陶瓷基体相比,SiBCN基体的孔隙率更低,高温下SiBCN氧化后形成SiO2和B_(2)O_(3),可以更好地降低O_(2)的透过率,提高材料的抗氧化性能和强度保留率。SiC coated C/SiC and C/SiBCN composites were prepared by chemical vapor deposition(CVD)combined with polymer infiltration and pyrolysis(PIP)techniques.The effects of thermal cycling on bending properties of the composites were studied.The results show that compared with SiC-C/SiC,the average bending strength of SiC-C/SiBCN is measured as around 605 MPa at room temperature,which increases by 126.6%.After the oxidation at 1000℃and 1200℃for 3 cycles,the residual bending strength of SiC-C/SiBCN is separately measured as 417 and 342 MPa.The corresponding strength retention rates at 1000℃and 1200℃are 68.9%and 56.5%,respectively.Compared with to the SiC ceramic matrix by PIP,the porosity of SiBCN ceramic matrix is lower.Meanwhile,SiO2 and B_(2)O_(3)are formed during the oxidation of SiBCN,which could decrease the permeation ration of the oxygen.Thus,the oxidation resistance and strength retention rate of SiC-C/SiBCN are significantly better than those of SiC-C/SiC composite.

关 键 词：SiC-C/SiBCN 复合材料 高温循环 抗弯曲强度 聚合物浸渍-裂解 

分 类 号：TB332[一般工业技术—材料科学与工程]