We investigated sol-gel-derived silica-based hard coatings on modified polyester substrates. The silica network was modified by incorporating an organic component and adding transition metal oxides. These modifications resulted in tailored thermal, optical, and mechanical properties of the coatings. Various low-temperature densification techniques were studied including sol-preparation procedure, enhanced solvent evaporation, ultraviolet irradiation, and low-temperature heating (below 150 °C). Oxygen plasma etching was applied to improve the adhesion of the sol-gel coatings on the plastic surface. Nanoindentation analysis revealed that the coatings have a surface hardness up to 2.5 ± 0.27 GPa and an elastic modulus up to 13.6 ± 0.4 GPa, approximately an order of magnitude higher than that of the plastic surface.
我们研究了改性聚酯基底上的溶胶-凝胶衍生二氧化硅硬涂层。通过加入有机成分和过渡金属氧化物,对二氧化硅网络进行了改性。这些改性使涂层具有量身定制的热学、光学和机械性能。研究了各种低温致密化技术,包括溶胶制备程序、增强溶剂蒸发、紫外线照射和低温加热(低于 150 °C)。为了提高溶胶-凝胶涂层在塑料表面的附着力,还采用了氧等离子刻蚀技术。纳米压痕分析表明,涂层的表面硬度高达 2.5 ± 0.27 GPa,弹性模量高达 13.6 ± 0.4 GPa,比塑料表面高出约一个数量级。