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

为了获得使用铅钛熔体在碳钢上涂覆TiC的基础信息，研究了S15 C、S25 C、S35 C、S45 C、S55 c和SK 5试样在1173至1373 K下在含有0.1至5质量% Ti的熔融铅中的固态反应。在含Ti量大于1%（质量分数）的Pb熔液中形成的TiC层表面覆盖着一层维氏硬度约为100的多孔Ti_2PbC相，但在试样表面得到了一层致密均匀的TiC相，维氏硬度为3000-3500。TiC层的厚度随Pb液中Ti含量、试样中C含量、退火时间和温度的增加而增加，但Ti_2PbC层的厚度与退火条件之间没有确定的关系。结果表明，TiC层生长于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.