Investigation on Al-Cr₂O₃-Al₂O₃ Sliding Gate Performance

Abstract

High performance Al-Cr2O3-Al2O3 sliding gate are made from tabular corundum, white fused corundum, aluminum powder, and chromium oxide powder. Phenolic resin is used as binder. The properties of the Al-Cr2O3-Al2O3 sliding gates with the different content of chromium oxide(mass percent 3%,6%,9%,12%,15%) which are made from different processes (dried at 200°C in air, fired at 1300°Cin N2 and fired at 1450°C in CO), are researched respectively. The results show that in different processes, the samples which contain 6% chromium oxide powder have higher cold crushing strength and hot modulus of rupture. After fired in N2, the new phases Al8Cr5 (1327°C), AlN are formed, and after fired in CO, Al8Cr5, Al2OC and Cr3C2 are formed. These materials are contributed to improve the mechanical properties of samples. The samples fired in N2 have the best performance.