| 摘要: |
| 采用反应熔体浸渗工艺在C/C复合材料表面制备了SiC和SiC/ZrC抗氧化涂层，并利用XRD、SEM和EDS等分析手段研究了浸渗粉料中Si/Zr质量比对抗氧化涂层的相组成和微观结构的影响，考察了SiC和SiC/ZrC涂层在1 400 ℃静态空气气氛中的抗氧化性能，初步探讨了SiC/ZrC涂层的抗氧化机制。研究结果表明，随着浸渗粉料中Si/Zr质量比由4.5∶1.5降至2∶4，制得的SiC/ZrC涂层表面涂层致密性呈现先增后降的趋势，而涂层厚度则逐渐减小。当Si/Zr质量比为3∶3时，制得SiC/ZrC涂层C/C复合材料表现出优良的抗氧化性能，在空气气氛中1 400 ℃氧化6 h后增重0.5 %左右，而SiC涂层C/C复合材料在相同条件下氧化5 h后失重率达到26.71%。SiC/ZrC涂层优异的抗氧化性能与其表面形成的一层致密、连续的ZrSiO4SiO2ZrO2玻璃膜有关。 |
| 关键词: C/C复合材料 浸渗粉料 SiC/ZrC 涂层 抗氧化 玻璃膜 |
| DOI：10.3969/j.issn.1007-9289.2014.03.008 |
| 分类号: |
| 基金项目: |
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| Effect of Si/Zr Mass Ratio on the Microstructure and Anti-oxidation Property of SiC/ZrC Coating |
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LIU Shuxian, DONG Zhijun, ZHANG Xian, ZHU Hui, ZHU Chuanjia, LI Xuanke
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College of Chemical Engineering and Technology, Wuhan University of Science and Technology, Wuhan 430081
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| Abstract: |
| A SiC and SiC/ZrC antioxidation coating was fabricated on the surface of C/C composites by reactive melt infiltration method. The influences of the mass ratio of Si and Zr in the infiltration powder on the phase composition, microstructure of the antioxidation coating were investigated by XRD, SEM and EDS. The high temperature antioxidation property of SiC and SiC/ZrC coating at 1 400 ℃ in static air was also studied, and the antioxidation mechanism of the SiC/ZrC coating was probed preliminarily. Results show that as the mass ratio of Si and Zr in the infiltration powder varying from 4.5∶1.5 to 2∶4, the coating compactness of the asprepared SiC/ZrC coating first increase and then decreases, however, the coating thickness of the composites decreases gradually. When the mass ratio of Si and Zr is 3∶3, the asprepared SiC/ZrC coated C/C composites present excellent antioxidation property and the weight gain is about 0.5% after oxidation at 1 400 ℃ for 6 h in air, whereas under the same condition that the weight loss of the prepared SiC coated composites is 26.71% after oxidation for 5 h. The outstanding antioxidation property of the prepared SiC/ZrC coating is mainly attributed to the dense and continuous ZrSiO4SiO2ZrO2 glass film generated on the coating surface during the oxidation process. |
| Key words: C/C composites infiltration powder SiC/ZrC coating antioxidation glass film |
