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6h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5h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ZrSiO4-SiO2-ZrO2玻璃膜有关。
A SiC and SiC/ZrC anti-oxidation 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 anti-oxidation coating were investigated by XRD,SEM and EDS.The high temperature anti-oxidation property of SiC and SiC/ZrC coating at 1 400 ℃in static air was also studied,and the anti-oxidation 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∶1.5to 2∶4,the coating compactness of the as-prepared 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 as-prepared SiC/ZrC coated C/C composites present excellent anti-oxidation property and the weight gain is about 0.5%after oxidation at 1 400℃for 6hin air,whereas under the same condition that the weight loss of the prepared SiC coated composites is 26.71%after oxidation for 5h.The outstanding anti-oxidation property of the prepared SiC/ZrC coating is mainly attributed to the dense and continuous ZrSiO4-SiO2-ZrO2glass film generated on the coating surface during the oxidation process.
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2014年第3期43-49,共7页
China Surface Engineering
基金
国家自然科学基金(91016003
51352001)
