Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion

Aliakbar Ghadi; Hassan Saghafian; Mansour Soltanieh; Zhi-gang Yang

doi:10.1007/s12613-017-1538-7

Volume 24 Issue 12

Dec. 2017

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文章导航 > 矿物冶金与材料学报（英文） > 2017 > 24(12): 1448-1458

Aliakbar Ghadi, Hassan Saghafian, Mansour Soltanieh, and Zhi-gang Yang, Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1448-1458. https://doi.org/10.1007/s12613-017-1538-7

Cite this article as:

Aliakbar Ghadi, Hassan Saghafian, Mansour Soltanieh, and Zhi-gang Yang, Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion, Int. J. Miner. Metall. Mater., 24(2017), No. 12, pp. 1448-1458. https://doi.org/10.1007/s12613-017-1538-7

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研究论文

Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion

Center of Excellence for High Strength Alloys Technology, School of Metallurgy and Materials Engineering, Iran University of Science and Technology, Tehran 16844, Iran
Key Laboratory of Advanced Materials of Ministry of Education, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China

通讯作者:
Mansour Soltanieh E-mail: Mansour_soltanieh@iust.ac.ir

中文摘要

The diffusion mechanism of carbide-forming elements from a molten salt bath to a substrate surface was studied in this research, with particular focus on the processes occurring in the molten bath at the time of coating. Metal, oxide, and metal-oxide baths were investigated, and the coating process was performed on H13 steel substrates. Scanning electron microscopy and electron-probe microanalysis were used to study the coated samples and the quenched salt bath. The thickness of the carbide coating layer was 6.5 ±0.5, 5.2 ±0.5, or 5.7 ±0.5 μm depending on whether it was deposited in a metal, oxide, or metal-oxide bath, respectively. The phase distribution of vanadium-rich regions was 63%, 57%, and 74% of the total coating deposited in metal, oxide, and metal-oxide baths, respectively. The results obtained using the metal bath indicated that undissolved suspended metal particles deposited onto the substrate surface. Then, carbon subsequently diffused to the substrate surface and reacted with the metal particles to form the carbides. In the oxide bath, oxide powders dissolved in the bath with or without binding to the oxidative structure (Na₂O) of borax; they were then reduced by aluminum and converted into metal particles. We concluded that, in the metal and oxide baths, the deposition of metal particles onto the sample surface is an important step in the formation of the coating.

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Research Article

Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion

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Abstract

Abstract

The diffusion mechanism of carbide-forming elements from a molten salt bath to a substrate surface was studied in this research, with particular focus on the processes occurring in the molten bath at the time of coating. Metal, oxide, and metal-oxide baths were investigated, and the coating process was performed on H13 steel substrates. Scanning electron microscopy and electron-probe microanalysis were used to study the coated samples and the quenched salt bath. The thickness of the carbide coating layer was 6.5 ±0.5, 5.2 ±0.5, or 5.7 ±0.5 μm depending on whether it was deposited in a metal, oxide, or metal-oxide bath, respectively. The phase distribution of vanadium-rich regions was 63%, 57%, and 74% of the total coating deposited in metal, oxide, and metal-oxide baths, respectively. The results obtained using the metal bath indicated that undissolved suspended metal particles deposited onto the substrate surface. Then, carbon subsequently diffused to the substrate surface and reacted with the metal particles to form the carbides. In the oxide bath, oxide powders dissolved in the bath with or without binding to the oxidative structure (Na₂O) of borax; they were then reduced by aluminum and converted into metal particles. We concluded that, in the metal and oxide baths, the deposition of metal particles onto the sample surface is an important step in the formation of the coating.
- thermal reactive diffusion;
- diffusion mechanism;
- carbide coating films;
- metal particles;
- borax bath

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Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion

中文摘要

Diffusion mechanism in molten salt baths during the production of carbide coatings via thermal reactive diffusion

Abstract

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