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化学气相浸渗/反应法制备MoSi2-SiC涂层的合成机理及其氧化性能

ISSN号：1003-6326
期刊名称：《中国有色金属学报：英文版》
时间：0
分类：TG1[金属学及工艺—金属学]
作者机构：[1]西北工业大学凝固技术国家重点实验室,西安710072
相关基金：Projects（51221001,51272213,51072166）supported by the National Natural Science Foundation of China; Project（GBKY1021）supported by the Fundamental Research Foundation of Northwestern Polytechnical University,China; Project（B08040）supported by Program of Introducing Talents of Discipline to Universities,China

作者：何子博[1], 李贺军[1], 史小红[1], 付前刚[1], 吴恒[1]

关键词： MoSi2-SiC涂层, 沉积温度, MTS原始分压, 氧化性能, MoSi2-SiC coating, deposition temperature, initial partial pressure of MTS, oxidation resistance

中文摘要：

采用化学气相浸渗/反应法（CVI/CVR）在C/C复合材料表面制备MoSi2-SiC防氧化涂层。首先,制备多孔金属Mo层,然后以甲基三氯硅烷（MTS）为前驱体,利用CVI/CVR技术制备MoSi2-SiC复合涂层。采用XRD、SEM技术研究MoSi2-SiC复合涂层的制备机理,并考察涂层样品的抗氧化性能。结果表明,MTS分解的SiC填充了多孔金属Mo层中的孔隙,并与金属Mo发生反应,制备出致密的MoSi2-SiC复合涂层;在优化工艺条件下所得到的涂层样品在1500°C空气中氧化80h后质量损失仅为1.25%。

英文摘要：

In order to protect C/C composites from oxidation, SiC-MoSi2 composite coating was synthesized by chemical vapor infiltration /reaction （CVI/CVR） technology. A porous Mo layer was prefabricated on SiC coated C/C composites, and then MoSi2 and SiC were subsequently prepared in a CVI /CVR process using methyltrichlorosilane （MTS） as precursor. The deposition and reaction mechanism of the MoSi2-SiC composite coating was investigated by X-ray diffraction （XRD） and scanning electron microscopy （SEM）. The oxidation behavior of SiC-MoSi2 coated specimens was tested. The results show that the porous Mo layer can be densified with SiC phase decomposed from MTS, and transformed into SiC-MoSi2 by reacting with MTS as well. A dense composite coating was prepared with optimized deposition parameters. The coated specimen exhibits a good oxidation resistance with a little mass loss of 1.25% after oxidation at 1500 °C for 80 h.