Rutile TiO₂ forms on TiC coatings (TiO₂/TiC coatings) during carbon-embedding heat treatment (cHT) for TiC coatings. The photocatalytic activity of TiO₂/TiC coatings has been significantly enhanced, especially under visible light. The influence of cHT temperature for TiC and Ti coatings on surface morphology, formed compounds, and photocatalytic activity has also been investigated. In general, rutile TiO₂ forms on TiC coatings, whereas TiC_xO_y forms on Ti coatings. By raising the cHT temperature for TiC coatings, the surface morphology of TiO₂/TiC coatings with a pore-like structure significantly changes from nano-size to micro-size, inevitably resulting in the reduction of the accessible surface area. However, the influence of cHT temperature on the Ti coatings is insignificant, demonstrating a smooth surface morphology. Notably, owing to the increased accessible surface area and formed heterojunction of TiO₂/TiC, the photocatalytic activity of TiO₂/TiC coatings has been significantly enhanced approximately 6 times especially under visible light, compared with that of TiC_xO_y/Ti coatings. Furthermore, when the cHT temperature has been raised, the photocatalytic activity of TiO₂/TiC coatings initially increases and then decreases, achieving their most satisfaction at 1073 K, which is attributed to the narrowed band gap of TiO₂ owing to the shifted O 1s spectra.

在TiC涂层的碳埋藏热处理（cHT）期间，金红石TiO ₂在TiC涂层（TiO ₂ / TiC涂层）上形成。TiO ₂ / TiC涂层的光催化活性得到了显着提高，尤其是在可见光下。还研究了cHT温度对TiC和Ti涂层的表面形态，形成的化合物和光催化活性的影响。通常，金红石型TiO ₂在TiC涂层上形成，而TiC _x O _y在Ti涂层上形成。通过提高TiC涂层的cHT温度，TiO ₂的表面形态具有孔状结构的/ TiC涂层从纳米尺寸显着变为微米尺寸，不可避免地导致可及表面积的减小。但是，cHT温度对Ti涂层的影响微不足道，表明其表面形态光滑。值得注意的是，由于增加的可及表面积和形成的TiO ₂ / TiC异质结，与TiC _x O _y / Ti涂层相比，TiO ₂ / TiC涂层的光催化活性显着提高了约6倍，特别是在可见光下。此外，当升高cHT温度时，TiO ₂的光催化活性/ TiC涂层最初增加然后减少，在1073 K时达到最满意的状态，这归因于由于O 1s光谱的偏移而使TiO _2的带隙变窄。