Vanadium carbide coating growth on die steel substrate in borax salt bath

Abstract

Vanadium pentoxide, borax, boron carbide and sodium fluoride were used to grow vanadium carbide coating on die steel(Cr₁₂, Cr₁₂MoV) surface at 950 °C by TD process, which extended the life period of Cr₁₂ and Cr₁₂MoV as punching die. Kinetics of vanadium carbide coating growth was brought forward and verified by comparison of the mathematical model with the experimental results. The thickness of coating was illustrated by SEM. The chemical constituent of coating and remnants were tested by XRD. To increase the thickness, rare earths (FeSiRe₂₃) were added to the borax salt bath. The electronic probe microanalysis (EPMA) revealed that the addition of rare earths could decrease carbon concentration in the coating and increase the depth of vanadium carbide coating.

Keywords

vanadium carbide coating / TD process / punching die / rare earths

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