Thermal Evolution of Al-containing Magnesia Refractory for RH Snorkels
Resin-bonded,Al-containing magnesia refractories have been an alternative of rebonded fused-grains magchrome bricks to be used as inner lining in the snorkels and lower vessel of RH degassers,having the advantages of being chrome-free and energy-saving(without burning),with a comparable performance.Microstructural investigations indicate that metal Al powder remains independent in the matrix after heating at 700℃ and 900℃,and Al4C3,Al2OC and Al4O4C crystalline whiskers start forming from 1100℃.The whiskers grow and connect into a network matrix with increasing temperatures,remaining up to 1600℃.Comparison of used bricks from different snorkels indicates a strong whisker networks formation in the brick achieving long service life and superior performance,which is attributed to flexible network structure of stable and interwoven whiskers.On contrary,there is a strongly-oxidized layer on the hot face and almost no whisker found anywhere in the brick with the short service life.It is vital to form the bonding phase of Nano-sized whiskers at high temperature,generating overall properties of high hot strength,high erosion resistance and thermal shock resistance,which are essential in the working conditions of RH snorkels.
GUO Zongqi MA Ying NEUBOECK Rainer KOECK Andreas
RHI MAGENSITA(Dalian)Co.,Ltd.,Dalian 116600,China RHI MAGNESITA,TCL,Leoben 8700,Austria
国际会议
Conference on Refractories International 2018, CRI2018)(2018国际耐火材料学术会议)
杭州
英文
1-7
2018-10-17（万方平台首次上网日期，不代表论文的发表时间）