Surface Engineering ( IF 2.4 ) Pub Date : 2020-12-25 , DOI: 10.1080/02670844.2020.1723317 Shahla Torabi 1 , Zia Valefi 2 , Naser Ehsani 1
ABSTRACT
In this research, the high-duration ablation resistance of SiC-gradient coating was investigated. SiC coating was prepared on graphite by reactive melt infiltration method at 1873 K under the argon atmosphere. Formation of the SiC layer with gradient distribution of Si and C elements was confirmed by X-ray diffraction patterns and scanning electron microscope micrographs. The results of the ablation test showed that SiC-graded coating with a proper adhesion could protect the graphite substrate up to 2073 K. The mass ablation rate for the SiC-graded coating after the 60 and 360 s ablation test under supersonic flame were −0.346 × 10−3 g/cm2 s and −0.022 × 10−3 g/cm2 s, respectively. The results indicated that the ablation mechanism of the SiC coating under supersonic flame is the SiO2 scouring from the central ablation region to the outer ablation region in the layer by layer form.
中文翻译:
超音速火焰下C/SiC功能梯度涂层的高持续时间耐烧蚀性
摘要
在这项研究中,研究了 SiC 梯度涂层的高持续时间抗烧蚀性。在氩气气氛下,在 1873 K 的温度下,通过反应熔体渗透法在石墨上制备了 SiC 涂层。通过 X 射线衍射图和扫描电子显微镜显微照片证实了具有 Si 和 C 元素梯度分布的 SiC 层的形成。烧蚀试验结果表明,具有适当附着力的 SiC 梯度涂层可以保护石墨基体高达 2073 K。在超音速火焰下 60 和 360 s 烧蚀试验后,SiC 梯度涂层的质量烧蚀率为 -0.346 × 10 -3 g/cm 2 s 和 -0.022 × 10 -3 g/cm 2 s,分别。结果表明,超音速火焰下SiC涂层的烧蚀机理为SiO 2从中心烧蚀区向外部烧蚀区逐层冲刷。