Pb-Ti融液を用いた炭素鋼へのTiC被覆

抄録

In order to obtain fundamental information on TiC coating on carbon steel using Pb-Ti melt, solid state reaction of S15C, S25C, S35C, S45C, S55C and SK5 specimens in molten Pb containing 0.1 to 5 mass%Ti at 1073 to 1373 K has been investigated. A dense and uniform TiC phase layer having Vickers hardness of 3000∼3500 was obtained on the surfaces of the specimens, although the TiC layer formed in molten Pb containing more than 1 mass%Ti was covered with a porous Ti₂PbC phase layer having Vickers hardness of about 100. Thickness of the TiC layer increased with increasing Ti content of molten Pb, C content of the specimens, annealing time and temperature, while any definite relation could not be found between thickness of the Ti₂PbC layer and annealing conditions. It is concluded that the TiC layer grows at the interface between TiC layer and molten Pb or Ti₂PbC layer and that the growth rate is controlled by diffusion process of C atoms in the TiC layer.