采用溶胶-凝胶工艺在玻璃基体表面制备的掺铈和未掺铈的纳米TiO_2薄膜,对玻璃基体具有强化作用.涂覆未掺铈TiO_2薄膜的玻璃与涂膜前相比较,其抗弯强度和断裂韧性分别增加了7%和24%,涂覆掺铈薄膜后玻璃的力学性能增加的更为显著.借助原子力显微镜(AFM)和X射线光电子能谱(XPS)分析,探讨了薄膜对玻璃基体表面强化的作用机制.研究表明,涂覆在玻璃表面均匀致密的纳米结构TiO_2薄膜,通过高温烧结,原子间发生相互扩散,牢固地粘附于玻璃表面,使玻璃表面的微裂纹、断键等得以修复,从而提高了玻璃的力学性能.
The Ce~(4+)-doped/undoped TiO_2 nanofilms coated on glass surface by sol-gel processing can improve the mechanical properties of glass substrate. Compared with the uncoated glass substrate, the bending strength and the fracture toughness of glass coated with pure TiO_2 nanofilms are enhanced by 7% and 24% respectively, and the strengthen effect of Ce~(4+) -doped TiO_2. nanofilms on glass is even more evident. The strengthening mechanism of nanofilms to the glass substrate was discussed by using AFM and XPS. The results indicate that the uniform titania nanofilms firmly adhere to the glass substrate because of atomic diffusion of each other during high temperature sintering, and the micro-crack and the break-down of chemical bonds of ions on the surface of glass are repaired. Consequently, the mechanical properties of glass substrate are improved.
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