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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第28卷    第2期    总第227期    2018年2月

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文章编号:1004-0609(2018)-02-0285-09
Si-Mo-Zr反应熔渗改性C/C复合材料的微观结构与烧蚀性能
郝安林1,郝振华2, 3,孙 威2,熊 翔2,陈招科2,王雅雷2

(1. 安阳工学院 机械工程学院,安阳 455000; 2. 中南大学 粉末冶金国家重点实验室,长沙 410083; 3. 郑州大学 河南省资源与材料工业技术研究院,郑州 450000)

摘 要: 为了提高C/C复合材料的抗烧蚀能力,采用不同配比的Si-Mo-Zr混合粉末反应熔渗改性C/C复合材料。利用X射线衍射分析仪(XRD)、扫描电镜(SEM)和透射电镜(TEM)分析改性C/C复合材料的物相组成和微观结构。利用氧乙炔焰烧蚀仪检测分析样品的烧蚀性能。结果表明:当混合粉末的成分配比为n(Si):n(Mo):n(Zr)=10:1:4时,样品熔渗效果最佳,密度和孔隙率分别为2.66 g/cm3和8.1%。熔渗效果较差的样品仅在靠近样品表面有SiC和ZrC陶瓷相共存的区域,样品内部仅含有少量SiC;熔渗较好的样品可以在样品内部观察到SiMoZrC固溶相以及环状ZrC相。熔渗效果较差的样品由于内部陶瓷相含量较少,其烧蚀性能随着烧蚀时间从300 s提高到600 s而急剧下降。

 

关键词: C/C复合材料;陶瓷基复合材料;SiC;反应熔渗;烧蚀性能

Microstructure and ablation properties of Si-Mo-Zr modified C/C composites by reactive melt infiltration
HAO An-lin1, HAO Zhen-hua2, 3, SUN Wei2, XIONG Xiang2, CHEN Zhao-ke2, WANG Ya-lei2

1. School of Mechanical Engineering, Anyang Institute of Technology, Anyang 455000, China; 2. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 3. Henan Province Industrial Technology Research Institute of Resources and Materials, Zhengzhou University, Zhengzhou 450000, China

Abstract:In order to improve the ablation resistance of C/C composites, C/C composites were modified by Si-Mo-Zr mixed powder with different chemical compositions by reactive melt infiltration. X-ray diffractometry(XRD), scanning electronic microscopy(SEM) and transmission electron microscopy(TEM) were used to analyze the phase composition and microstructure of the modified C/C composites. The results show that infiltrated composite have the best infiltration effect when the chemical composition of the mixed powder is n(Si):n(Mo):n(Zr)=10:1:4, whose density and porosity are 2.66 g/cm3 and 8.1%, respectively. The regions with ZrC and SiC ceramics can be only observed around the surface of the samples with worse infiltration effect while only SiC can be observed inside of them. However, for the samples with better infiltration effect, SiMoZrC solid solutions and ringlike ZrC can be observed inside the samples. The ablation properties of the samples with worse infiltration effect decrease when the ablation time increases from 300 s to 600 s due to their limited ceramics phases inside.

 

Key words: C/C composites; ceramic matrix composites; SiC; reactive melt infiltration; ablation property

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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