Study On Spark Plasma Sintering And Electro-conductive Performance Of Sno₂-based Ceramics

Dense SnO2-based ceramics is highly concern in industry for its good electrical conductivity, chemical stability and so on, and they are widely used in industry and medical thermometer, liquid level control, liquid flow measurement,amplifier power gain amplification controller, solar battery, conductive target materials,glass refining and so on. However, in SnO2 high temperature sintering process,the diffusion coefficient of Sn4+ and O2- are very low, SnO2 can easily volatilize and convert into SnO (g) and 1/2O2 (g),and it made pure SnO2 ceramics hard to sinter. There are a lot of study reports.about improving the sintering characteristics and electrical properties of SnO2,mainly by adding composite sintering additives of conventional sintering method and the special sintering one.In this paper,sintering by SPS (Spark Plasma Sintering) can complete this sintering process at a low temperature,and it can effectively overcome the high-temperature sintering of SnO2 in the volatile, and through doping additives can effectively improved the sintering properties of SnO2-based ceramics and electrical conductivity,then geting good. overall performance sample.CuO is a good kind of sintering additives,and small amounts of CuO doping can significantly improved SnO2 sintering performance. With the increase amount of CuO doping, the density and relative density of SnO2-based ceramics showing first increases, then decreases. With Sb2O3 doping the density and relative density of SnO2-based ceramics increase a little but not obviously.It is not obvious that the change of SnO2-based ceramics electrical properties as the sintering temperature and doping cuo.However,Sb2O3 doping can significantly improve the electrical properties of SnO2-based ceramics,even a small amount of doping, and through the composite performance of doping can get good integrated sample.Through systematical laboratory analysis, determining the pressure 40MPa, heating rate:200℃/min, holding time:3 minutes as the experiment, and obtain good performance of samples by changing the doping components of content and sintering temperature.Thus, when the CuO content of 1.0mol%, sintering temperature is at 1000℃,The density and relative density of SnO2-based ceramics are respectively up to 6.93g·cm-3 and 99.7%.And when Sb2O3 doping amount of 0.5mol% and sintering temperature 950℃, the density and relative.density of the sample, respectively up to 6.80g·cm-3 and 97.21%, while the resistivity at room temperature comes to 2.35×10-2Ω·cm.Formula of the material composition of SnO2-1.0CuO-1.0Sb2O3 sintering temperature of the sample at 950℃, the relative density of 96.2%, the density is up to 6.71g·cm-3, and the resistivity at room temperature can reach to 1.47×10-2Ω·cm.