不同氮化温度下h-BN对Al_(2)O_(3)-C耐火材料显微结构与性能的影响  

Effect of h-BN on Microstructure and Properties of Al_(2)O_(3)-C Refractories at Different Nitriding Temperatures

作　　者：陈韬 王杏[1] 刘正龙 邓承继[1] 余超[1] 丁军[1] 祝洪喜[1] CHEN Tao;WANG Xing;LIU Zhenglong;DENG Chengji;YU Chao;DING Jun;ZHU Hongxi(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐学报》2022年第12期3305-3313,共9页Journal of The Chinese Ceramic Society

基　　金：国家自然科学基金区域创新发展联合基金(U20A20239);湖北省重点研发计划(2021BAD002)。

摘　　要：以电熔白刚玉、鳞片石墨、活性α-Al_(2)O_(3)微粉、金属Al粉和Si粉为主要原料、h-BN(质量分数0%、3%)为添加剂,制备低碳Al_(2)O_(3)-C耐火材料,研究了不同氮化温度下添加h-BN对Al_(2)O_(3)-C耐火材料显微结构、物理性能以及抗氧化性能的影响。结果表明:添加h-BN促进了SiC晶须的生成,在1400℃氮化后添加h-BN样品的常温耐压强度和常温抗折强度较未添加h-BN样品分别提高了6%和10%;添加h-BN样品的抗氧化性能得以显著提升,其中1500℃氮化后添加h-BN样品的抗氧化性能较未添加h-BN样品提高了21%。A low-carbon Al_(2)O_(3)-C composite refractory was prepared with white fused alumina,flake graphite,activeα-Al_(2)O_(3)micron-sized powder,Al powder and Si powder as raw materials,and h-BN(in mass fraction 0%,and 3%)as additives.The effect of h-BN addition on the microstructure,physical properties and oxidation resistance of Al_(2)O_(3)-C refractories at different nitriding temperatures was investigated.The results show that the addition of h-BN promotes the formation of SiC whiskers.The cold compressive strength and cold modulus of rupture of the samples with h-BN addition after nitriding at 1400℃are 6%and 10%greater than those of the samples without h-BN addition,respectively.Also,the oxidation resistance of the samples with h-BN addition is significantly improved.Among those samples,the oxidation resistance of the samples with h-BN addition after nitriding at 1500℃is improved by 21%,compared with the samples without h-BN addition.

关 键 词：六方氮化硼 氮化温度 低碳铝碳耐火材料 抗氧化性能 物理性能 

分 类 号：TQ175[化学工程—硅酸盐工业]