复合溶胶凝胶法制备TiB2可湿性阴极涂层

针对铝工业阴极和阳极碳电极以及侧壁耐蚀导电二硼化钛陶瓷涂层技术,研究用非有机溶剂湿化学陶瓷清洁制造技术,替代沥青粘结工艺。通过氧化铝胶体中的纳米粒子,分散清洁二硼化钛,形成均匀陶瓷悬浮涂料,经刷涂或喷涂形成TiB2涂层。对二硼化钛与工业铝电解体系熔体、气相的化学侵蚀性进行了理论计算,分析了炭基TiB2涂层的耐蚀性、捕获钠的机理。用SEM分析了二硼化钛涂层断面,二硼化钛在氧化铝胶粒的分散下,迁移、渗入多孔的碳基底,在热处理条件下,与基底间形成很强的化学键合,可形成微米至数毫米厚、无龟裂的涂层。涂层的电性能检测结果表明,浆料中氧化铝胶体含量为 10%Wt时电阻率较低,电阻率随烧结温度升高而降低。

The Preparation of Wettable TiB2 Coatings on Cathode by Composite Sol-Gel Technology

A novel clean coating preparation of electrically-conductive, corrosion-resistant TiB 2 coating for carbonaceous cathode and anode by using non-organic solvent slurry making process, was investigated for modern aluminum industry. The slurry was prepared by mixing TiB 2 particles with nano-particulate colloidal alumina in a specific proportion, and then was sprayed or plastered on the carbon substrate. The TiB 2 particles were wetted and equably dispersed by the nano-sized alumina particulates. A thermodynamic database was applied to analyze the chemical stability and corrosion resistance of the TiB 2 coating. According to the SEM results, the slurry filtered into the substrate and formed a chemical bonding. The measurement results of electrical conductivity indicated that the electrical resistivity decreased with the increasing of sinter temperature and the solid content of the alumina colloid.