钌锡氧化物复合涂层的制备与相结构特点

Preparation and phase structure characteristic of Ru-Sn oxide anode coatings

采用在涂液中引入不同含量的纳米SnO2晶种的方法,用溶胶凝胶技术制备30%RuO2-70%SnO2复合涂层钛阳极。本试验在通过引入的SnO2晶种的XRD衍射峰为内标,详细分析所制备的钌锡复合氧化物涂层的相结构和固溶状态。结果表明,可以获得具有不同SnO2晶种含量的RuO2-SnO2复合涂层钛阳极,其中SnO2种子经过第二次的500℃热处理,未出现明显的长大和成分扩散现象。同时观察到,不含晶种常规钌锡涂层是由(Sn,Ru)O2金红石固溶体相和RuO2所构成,RuO2为固溶体在加热过程中析出的相。采用Vegard公式初步计算,制备涂层中的Sn含量要明显低于名义含量。

A series composite 30%RuO2-70%SnO2/Ti DSA anodes were prepared through a sol-gel technique by adding different content of SnO2 seeds.The diffraction peaks of the SnO2 seeds were used as the internal calibration indexing,based of which the phase structures and solid solution states of the coatings were investigated.The results show that the composite RuO2-SnO2/Ti anodes with different content of SnO2 seeds could be prepared,in which SnO2 seeds do not grow up further and no any diffusion phenomenon appears after heat treatment at 500 ℃.It is observed that the conventional Ru-Sn oxide coating without seeds is composed of rutile solid solution（Sn,Ru）O2 and RuO2,the latter is from the segregation of solid solution during the heating process.By Vegard formula,the calculated solid solubility of Sn in the coating is much lower than the nominal content.