Dense, uniform, smooth SiO2/TiO2 hard coatings derived from a single precursor source of tetra-n-butyl titanate modified perhydropolysilazane
| Autor: | Xiao Fengyan, Dan Wang, Caihong Xu, Yongming Luo, Liang Qianying, Zongbo Zhang |
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| Rok vydání: | 2018 |
| Předmět: |
Uniform distribution (continuous)
Materials science biology General Chemical Engineering Composite number 02 engineering and technology General Chemistry Surface finish engineering.material 010402 general chemistry 021001 nanoscience & nanotechnology biology.organism_classification 01 natural sciences Titanate 0104 chemical sciences Smooth surface Chemical engineering Coating Photocatalysis engineering Tetra 0210 nano-technology |
| Zdroj: | RSC Advances. 8:16746-16752 |
| ISSN: | 2046-2069 |
| DOI: | 10.1039/c8ra02289e |
| Popis: | SiO2/TiO2 composite coatings are of great interest due to their optical, photocatalytic, electrical and mechanical properties. There are many methods for preparing SiO2/TiO2 composite coatings. Among these, the sol–gel process is eco-friendly and easily implementable for industrial applications. However, it is still a great challenge to prepare dense, uniform and smooth SiO2/TiO2 composite coatings with a sol–gel process. In this work, we show a modified sol–gel process for achieving dense, uniform and smooth SiO2/TiO2 coatings with tetra-n-butyl titanate modified perhydropolysilazane (PHPS) as a single precursor source, in which PHPS acts as the source for SiO2 instead of a traditional alkoxylsilane compound. The micro-morphology and composition evolution during the preparation process have been investigated; a smooth surface with a roughness average (Sa) below 4.5 nm and a uniform distribution of Ti elements over the entire coating are shown. These dense, uniform SiO2/TiO2 coatings exhibit excellent mechanical robustness, with hardness values as high as 9.45 GPa, excellent optical transparency and hydrophilic properties. |
| Databáze: | OpenAIRE |
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