Summary
The possibility of gas phase boronizing or boron vapor plating with a mixture of diborane and hydrogen has been established. The best results were obtained at 800–850°C (1470–1560°F) in 4–5 hours, with diborane/ hydrogen=1/75, flowing at 75–100 liters per hour. Under these conditions, a very hard boronized case, 200 microns (0.008 in) thick, was obtained on [carbon] steel 45; the surface microhardness was 3000.
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Zhigach, A.F., Antonov, I.S., Pchelkina, M.A. et al. Surface impregnation of steel with boron from the gas phase. Met Sci Heat Treat 1, 47–50 (1959). https://doi.org/10.1007/BF00820275
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DOI: https://doi.org/10.1007/BF00820275