TiC Coating on Carbon Steels Using Molten Pb as A Medium for Transfer of Ti Atoms.

为了获得利用Pb-Ti熔体在碳钢上镀TiC的基本信息，研究了S15C、S25C、S35C、S45C、S55c和SK5试样在含Ti质量% 0.1 ~ 5%的Pb熔液中，在1173 ~ 1373 K下的固相反应。虽然在含Ti质量%以上的熔融Pb中形成的TiC层被一层维氏硬度约为100的多孔Ti_2PbC相层覆盖，但在试样表面获得了致密均匀的TiC相层，维氏硬度为3000 ~ 3500。TiC层厚度随熔融Pb中Ti含量、试样中C含量、退火时间和温度的增加而增加，而Ti_2PbC层厚度与退火条件之间没有明确的关系。结果表明，TiC层生长在TiC层与熔融Pb或Ti_2PbC层的界面处，其生长速率受C原子在TiC层中的扩散过程控制。

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 1173 to 1373 K has been investigated. A dense and uniform TiC phase layr having vikers hardness of 3000-3500 was obtained on the surfaces of the specimens, although the TiC layr formed in molten Pb containing more than 1 mass% Ti was covered with a porous Ti_2PbC phase layr having vikers hardness of about 100. Thickness of the TiC layr 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 Ti_2PbC layr and annealing conditions. It is concluded that TiC layr grows at the interface between TiC layr and molten Pb or Ti_2PbC layr and that the growth rate is controlled by diffusion process of C atoms in TiC layr.