【摘要】 本工作采用溶胶-凝胶工艺研制出了防护普通硅酸盐玻璃的 BaO-TiO₂-SiO₂系耐碱涂层.合成了适合于浸涂工艺的稳定溶液,在较长时间内可维持粘度不变.红外光谱表明,醋酸与有机钛形成了稳定的配位体,从而延长了凝胶时间.Si-O-Ti 键在初始溶液中已经形成.>420℃,凝胶的热失重已很小,说明已基本除去有机物并且构成了氧化物网络.用 X 射线荧光分析法测定了侵蚀前后薄膜中 TiO₂的含量,以分析涂层的化学稳定性.适当选择成份、提升速度和热处理条件,可制备出能有效防护基玻璃不受60℃的1N NaOH 碱液侵蚀的稳定涂层.更多还原

【Abstract】 Alkali resistant coatings on silicate glasses have been successfully developed via Sol-gelroute in the system of BaO-TiO₂-SiO₂.The stable solutions suitable for dip coating pro-cess have been prepared,whose viscosities remain nearly constant for a long period of time（>20days）.The infrared spectroscopic studies indicated that acetic acid is active in the coor-dination chemistry of the titanium and their ligands are very stable,which prolong the timeof gelation of the solutions.The Si-O-Ti linkage appears in the initial solutions.The verysmall weight loss of gels above 420℃ is due to the removal of organic groups and there is theformation of oxide network.The detection of the TiO₂ content in the films after the alkalineattack was performed by the X-ray fluorescence analysis （XFA） to evaluate the chemical dura-bility of the coatings.With the suitable choise of compositions,withdrawal speed and bakingconditions,good coatings on glasses could be obtained,which can protect the surface of silicateglass substrates against 1N NaOH attack at 60℃ for a long period of time.更多还原