Structure and morphology studies of chromium film at elevated temperature in hypersonic environment

Bulletin of materials science

M Nagaboopathy¹  V Kulkarni²  K P J Reddy¹  G M Hegde³ 

[1] Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India$$Department of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, IndiaDepartment of Aerospace Engineering, Indian Institute of Science, Bangalore 560 012, India$$;Department of Mechanical Engineering, Indian Institute of Technology, Guwahati, India$$Department of Mechanical Engineering, Indian Institute of Technology, Guwahati, IndiaDepartment of Mechanical Engineering, Indian Institute of Technology, Guwahati, India$$;Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560 012, India$$Centre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560 012, IndiaCentre for Nano Science and Engineering, Indian Institute of Science, Bangalore 560 012, India$$

关键词: Cr coating;    Cr oxidation;    drag reduction;    surface morphology.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

This paper presents the after shock heated structural and morphological studies of chromium film coated on hypersonic test model as a passive drag reduction element. The structural changes and the composition of phases of chromium due to shock heating (2850 K) are characterized using X-ray diffraction studies. Surface morphology changes of chromium coating have been studied using scanning electron microscopy (SEM) before and after shock heating. Significant amount of chromium ablation and sublimation from the model surface is noticed from SEM micrographs. Traces of randomly oriented chromium oxides formed along the coated surface confirm surface reaction of chromium with oxygen present behind the shock. Large traces of amorphous chromium oxide phases are also observed.

【 授权许可】

Unknown