Abstract The formation conditions and their influence on the properties of mullite-SiC refractory were studied by adding metallic Al powder to the raw materials to form AlN whiskers in a coke dry quenching furnace. The results show that the AlN whiskers were formed in situ and interacted to form networks in the matrix when the metallic Al powder was added into the mullite-SiC refractory after heat treatment above 850 °C for 8 h under nitrogen flow. The whiskers grew lengthwise as the firing temperature increased and the cold modulus of rupture, cold crushing strength, and hot modulus of rupture increased. The amount and particle size of the metallic Al powder also affected the properties of the refractory. The optimum amount of Al powder addition was determined to be 6 wt%, which provided the highest strength and excellent toughness after heat treatment at 1000 °C for 8 h under nitrogen. Reducing the particle size of the metallic Al powder could promote formation of the AlN whiskers and improve the strength of the refractory.

中文翻译：

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使用原位形成的氮化铝晶须改善焦炭干熄焦中的莫来石-碳化硅耐火材料

摘要 以金属铝粉为原料，在干熄焦炉中形成AlN晶须，研究了莫来石-SiC耐火材料的形成条件及其对性能的影响。结果表明，将金属铝粉加入莫来石-SiC 耐火材料中，在氮气流下，在 850 ℃以上热处理 8 小时后，AlN 晶须原位形成并在基体中相互作用形成网络。随着烧成温度的升高，晶须纵向生长，冷断裂模量、冷抗压强度和热断裂模量增加。金属铝粉的用量和粒度也影响耐火材料的性能。铝粉的最佳添加量为 6 wt%，在氮气下 1000°C 热处理 8 小时后，它提供了最高的强度和优异的韧性。减小金属铝粉的粒径可以促进AlN晶须的形成，提高耐火材料的强度。