Journal
VACUUM
Volume 155, Issue -, Pages 219-223Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.vacuum.2018.06.015
Keywords
Fluoride molten salt; Thermal diffusion processes; Chromium carbide coatings
Funding
- Science and Technology Commission of Shanghai Municipality [11JC1414900]
- National Basic Research Program of China [2010CB934501]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDA02040000]
Ask authors/readers for more resources
LiF-NaF-KF (46.5-11.5-42 mol %, FLiNaK) molten salt was used in the thermal diffusion (TD) process to form chromium carbide coatings on gray cast iron HT250 at 900 degrees C for 8 h. The structure and chemical composition of the coating were observed by scanning electron microscopy coupled with energy dispersive X-ray microanalysis (SEM-EDX) and X-ray diffraction (XRD). Both the nanoindentation hardness and Vickers hardness were measured. A 3-5 mu m thick chromium carbides layer and approximately 10 pm thick transition layer were formed on the surface of gray cast iron HT250. The chromium carbides layer was composed of Cr23C6 and Cr7C3. The hardness of gray cast iron HT250 was increased 6 times after treatment. The tribological behavior was also improved. These results demonstrate that fluoride salts can be used as base salts to form excellent chromium carbides coatings via the TD process.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available