【作者】 李捷；

【导师】 沈强；

【作者基本信息】 武汉理工大学 ， 光电子及信息材料， 2007， 硕士

【摘要】 密实SnO₂电极陶瓷材料具有良好导电性能和抗玻璃液侵蚀性能，是玻璃电熔技术的关键组成部分。论文以SnO₂、CuO、Sb₂O₃粉体为原料，采用无压烧结技术制备含CuO与Sb₂O₃复合添加剂的SnO₂基电极陶瓷材料，并系统研究其相关性能。烧结致密化研究表明，CuO的最佳添加量为0.5～1.0mol％。当CuO含量为0.5或1.0mol％，Sb₂O₃含量不宜超过CuO。SnO₂-CuO-Sb₂O₃电极陶瓷的烧结致密化有两种情况：一是当Sb₂O₃含量少于CuO含量时，在晶界区域的CuO在高温时产生富铜的液相起到粘结作用占主导地位，促进SnO₂基陶瓷烧结致密化；二是当Sb₂O₃含量多于CuO含量时，与SnO₂发生固溶反应占主导地位，抑制SnO₂基陶瓷烧结致密化。电学性能测量结果表明，SnO₂-1.0mol％CuO-1.0mol％Sb₂O₃电极陶瓷具有良好的综合导电性能，其室温温电阻率为5.87×10^-2Ω·cm，700℃中温电阻率为5.96×10^-3Ω·cm。当SnO₂-CuO-Sb₂O₃。陶瓷材料未烧结致密时，增加CuO含量，增加载流子迁移率，进而导致电阻率降低；当SnO₂-CuO-Sb₂O₃陶瓷材料已烧结致密时，增加CuO含量增加晶界富Cu相的厚度，使得载流子迁移率下降，从而导致电阻率升高。力学强度测量结果表明，当Sb₂O₃含量不超过CuO含量时，Sb₂O₃的加入增加了SnO₂-CuO-Sb₂O₃基电极陶瓷的抗弯强度，主要原因是与SnO₂发生的固溶反应导致了晶粒的细化。SnO₂-0.5mol％CuO-0.25mol％Sb₂O₃电极陶瓷材料的抗弯强度达到最高值190MPa。采用玻璃液侵蚀静态测量方法测量SnO₂-CuO-Sb₂O₃基电极陶瓷在1200℃的钠钙玻璃液的侵蚀速率，结果表明SnO₂-CuO-Sb₂O₃基陶瓷具有良好的抗玻璃液侵蚀能力。当Sb₂O₃的含量在0.1～1.0mol％时，SnO₂-1.0mol％CuO-Sb₂O₃基电极陶瓷玻璃液侵蚀速率在3～4×10^-4mm／h之间。更多还原

【Abstract】 Dense SnO₂ based electrode ceramics with excellent conductive property and good corrosion resistance to molten glass is the very important component of glass electric-melting industry.In this paper, SnO₂ based electrode ceramics of high performances simultaneously doped with CuO and Sb₂O₃ is prepared by pressureless sintering. In SnO₂-CuO-Sb₂O₃ electrode ceramics, optimal concentration of CuO is 0.5mol%～1.0mol%, the concentration of Sb₂O₃ is not exceeding to CuO. When concentration of Sb₂O₃ is lower than CuO, because liquid phase sintering mechanism of rich Cu phase is dominate, densification is promoted. On the contrary, solid solution reaction of Sb₂O₃ and SnO₂ will restrain densification.Results of measuring resistivity of SnO₂-CuO-Sb₂O₃ electrode ceramics show that SnO₂-1.0mol%CuO-1.0mol%Sb₂O₃ ceramics has the best electric-conductive property. Room temperature resistivity is reduced to 5.87×10^-2Ω·cm, and resistivity at 725℃is 5.96×10^-3Ω·cm. When ceramics is not dense, increasing of CuO improves carrier mobility, then decreases resistivity. When ceramics is dense, increasing of CuO decreases carrier mobility, then enhances resistivity.Sb₂O₃ improves bend strength and decreases corrosion resistance to molten Na&Ca-glass（1200℃） of SnO₂-CuO-Sb₂O₃ electrode ceramics. Bend strength of SnO₂-0.5mol%CuO-Sb₂O₃ electrode ceramics arrives to 185～190MPa. As concentration of Sb₂O₃ is lower than CuO, corrosion rates of SnO₂-1.0mol% CuO-Sb₂O₃ electrode ceramics are decreased to 3～4×10^-4mm/h, lower than the results reported by the references.更多还原