ホウ砂とカーボランダムの熱浴による軟鋼表面の浸ホウ硬化処理の研究

ホウ砂とカーボランダム熱浴による金属表面の浸ホウ処理の研究 (第1報)

抄録

A simple and economical process for boriding metal surfaces was found. The process was only to immerse the metal in a hot salt bath containing borax and carborundum, where no special atmosphere was needed.
Optimum conditions found for boriding of mild steel were to dip the steel in a bath containing 60-50wt% of borax and 40-50wt% of carborundum at 1, 000°C for 6hrs. The boride layer produced by this process was composed of Fe₂B, which was 170μ in thickness, having about 1, 200 of Vickers hardness.
The mild steel lying beneath the boride layer was also observed hardened. The results of chemical analysis and electron probe microanalysis showed that the hardening of the interior mild steel was attributed to the boron and carbon penetrating through the boride layer.