关键词: β-SiAlON, SiC, SiO₂微粉, 抗碱性, 正极材料, 匣钵

Abstract: Under the premise of keeping good alkali resistance of β-SiAlON-SiC material used as saggers for firing ternary cathode materials of lithium batteries,β-SiAlON-SiC materials were prepared with SiC particles and fine powder,Si powder,Al powder and α-Al₂O₃ micropowder as starting materials by the high temperature nitridation method.The influences of the silica fume addition (0,1%,2%,and 3%,extra adding,by mass) on the apparent porosity,the bulk density,the cold modulus of rupture,the hot modulus of rupture,the phase composition and the alkali resistance were researched.The results show that:(1)the silica fume addition reduces the apparent porosity,and increases the cold modulus of rupture and the hot modulus of rupture greatly;(2)the silica fume addition does not affect the nitridation of Si powder and Al powder,while impedes the solid solubility of Al₂O₃ in Si₃N₄ and the formation of β-SiAlON;(3)the optimal silica fume addition is 1% and the obtained sample has much better alkali resistance than that without silica fume.

Key words: β-SiAlON, silicon carbide, silica fume, alkali resistance, cathode material, sagger