Research On Preparation And Property Of Cr₂O₃/ZrO₂Refractory

The aim of this research is to develop Cr₂O₃/ZrO₂refractory materials for glasskilns.1) Cr₂O₃/ZrO₂samples were sintered in reducing atmosphere with TiO2assintering agent. The influences of ZrO₂content, ZrO₂particle size and sinteringtemperature on the densification and physical properties of the samples were studied.The toughening mechanism of ZrO₂to Cr₂O₃/ZrO₂material was analyzed.2)Cr₂O₃/ZrO₂/SiC samples were sintered in N2atmosphere with TiO2as the sinteringagent. The reduction effect of SiC on the microstructure and properties of the sinteredsamples was studied with the content and particle size of SiC.The results show that:1) Cr₂O₃/ZrO₂sample got low apparent porosity and highvolume density when it was sintered at1550℃with4wt%ZrO₂; At the samesintering temperature, samples containing4⁶wt%ZrO₂owned nice compressionstrength at room temperature; The sample which was sintered at1450℃got bestcompressive strength at room temperature, and the compressive strength decreasedwith the increasing of temperature; The sample containing4wt%ZrO₂had bestphysical properties and thermal shock resistance;2) Compared to micr-ZrO₂, thesample which was toughened by nano-ZrO₂got better physical properties;3) TheCr₂O₃/ZrO₂samples were not sintered densely in pure N2at1550℃. However, thesamples using SiC as reducing agent were densely sintered at the same sinteringconditions, and the sintered samples got better thermal shock resistance;4) With thedecreasing of SiC particle size, the apparent porosity of the sintered sample decreasedand the density increased.