Fe2B coating by immersion in molten KCl-BaCl2-NaF salt.
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Surface hardening of SKD 11 was investigated by immersing it into a molten salt consisting of KCl-BaCl2-NaF-B2O3-ferroboron at temperatures of 1073K-1273K. It is thought that a disproportionation reaction in molten salts enables the chemical transportation of boron from a powder source to the surface by means of the process that-can be described as follows.2B3++B (powder source)→3B2+3B2++2Fe→2B3++Fe2B (surface layer)Film thickness grows with an increase in the temperature and treatment time, respectively. The interface between the Fe2B layer and the substrate was wedge-shaped. The Vickers hardness in the vicinity of the surface reached about 1600. This process increased wear resistance, but did not improve corrosion resistance.
- 社団法人 表面技術協会の論文
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