Study On Preparation And Performance Of SnO₂-CuO-Sb₂O₃ System Electrode Ceramics

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.