Study On The Preparation Of Tin Dioxide Electrode And Its Toughening

Tin dioxide (SnO₂) electrode is used for melting the glass or enamel etc. It needs not only good electrical properties, but also high demands to resisting corrosion and high toughness. Nowadays, SnO₂ electrodes with high quality depend mainly on imports, and the quality of the electrodes made in our country is poor, which hardly meets the high quality requirement for production and application.In the past, the study was mainly for SnO₂ ceramics or films, which usually had a good requirement only for sintering or for electrical performance. But SnO₂ electrode needs a good performance o n not only e lectrical properties but mechanical propertiesThis paper studied the sinter and toughness of the Tin dioxide electrode used in glass melting furnace through the technology and chemical adulterate. Started with the basic elements and based on the knowledge of common oxides doped and quantity, the technology and doped cerium dioxide was studied in order to increase the toughness of Tin dioxide electrode.As for the conventional additives, according to related information, six oxides were chosen and used in the study by the Orthogonal Experimental method. After it sintered, the density, porosity and resistance under room temperature weremeasured and found that the mixed addition of Sb₂O₃, MnO₂, CuO had the best comprehensive performance. Moreover, with the Orthogonal Experimental method again, optimum amount of additions was found.On the technology, we studied from the materials, to presintering of the raw material, raw/presintering material match, sintering atmosphere, sintering temperature. By the experiment, it was found that the sinter performance could be improved by the match of 1:4 raw/presintering materials. At the same time, we found that different grain match was also favorable to sintering. What's more, we found the grind of corundum ball would produce the alumina, which was harmful to Tin dioxide electrode. By optimizing the technique and decreasing the time of grind, we got the very good manufacturing technology.Because of the excellent properties of rare earth, we studied t he i nfluence of CeO₂ to Tin dioxide electrode. By changing the quantity of cerium dioxide doped, testing with x-rays diffraction instrument, SEM, mechanical hardness test etc., we found Tin dioxide electrode contained lwt.% Cerium dioxide had a good performance with the increase of 3.5% in fracture toughness and 27% in V-hardness. It is found that the CeO₂ doped in SnO₂ could increase the flexural strength and toughness. To some extend, it can boost the formation and growth of SnO₂ and make SnO₂ crystal grows three-dimensionally , which improve the mechanical properties of SnO₂ electrode as well as electrical properties.By analyzed the microstructure as well as the influence of the technology and chemical adulterate, it was known thatproper technology and additives was favorable to the growth of the crystal lattice of Tin dioxide and the formation of columnar grain, which increased greatly the obdurability. The mechanism of toughing mostly is micro-crack toughness and bridging toughness.