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由80%～90%板状刚玉及20%～10%金属铝组成的坯料经氮化处理(温度1100℃)后,再进行表面氧化处理(温度800℃),可制得显气孔率为2%的Al?AlN?Al2O3滑板材料,其1400℃高温抗折强度高达48.7MPa.该滑板材料浇钢的使用寿命是Al2O3?C滑板的2倍.显微结构分析表明,部分金属铝氮化形成AlN的体积膨胀效应及其对刚玉晶粒的结合作用,提高了材料的结构致密度和强度,赋予材料优良的抗钢液侵蚀性能.部分金属铝的高温塑性状态、金属铝及氮化铝的高导热性、刚玉与氮化铝的复相热失配等,是材料具有高抗热震性能的主要原因.
The blank, consisting of 80% -90% plate-like corundum and 20% -10% aluminum, was nitrided (temperature 1100 ° C) before surface oxidation (temperature 800 ° C) % AlAlAl2O3 skateboard material, its high temperature 1400 ℃ flexural strength up to 48.7MPa. The skateboard material life of the steel is 2 times the Al2O3? C skateboard. Microstructure analysis showed that part of the metal aluminum nitride formation The volume expansion effect of AlN and its combination with corundum grains increase the structure density and strength of the material and give the material excellent resistance to molten steel erosion.The high temperature plasticity of some aluminum, the aluminum and aluminum nitride High thermal conductivity, corundum and aluminum nitride complex phase thermal mismatch, etc., is the material with high thermal shock resistance of the main reasons.