Investigation on Al-Cr_2O_3-Al_2O_3 sliding gate performance

摘要

High performance Al-Cr_2O_3-Al_2O_3 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-Cr_2O_3-Al_2O_3 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°Cin air, fired at 1300°C in N_2 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 N_2, the new phases Al_8Cr_5 (1327°C), AlN are formed, and after fired in CO, Al_8Cr_5, Al_2OC and Cr_3C_2 are formed. These materials are contributed to improve the mechanical properties of samples. The samples fired in N2 have the best performance.