h-BN对低碳Al_(2)O_(3)-C耐火材料性能的影响  

Effect of h-BN on properties of low carbon Al_(2)O_(3)-C refractories

作　　者：罗益欣 王杏[1,2] 刘正龙 余超 邓承继[1] 丁军[1] Luo Yixin;Wang Xing;Liu Zhenglong;Yu Chao;Deng Chengji;Ding Jun(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China;不详)

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,湖北武汉430081 [2]武汉科技大学化学与化工学院,湖北武汉430081

出　　处：《耐火材料》2025年第1期13-18,共6页Refractories

基　　金：湖北省重点研发计划(2023BAB106);国家自然科学基金区域创新发展联合基金(U20A20239)联合资助。

摘　　要：针对低碳Al_(2)O_(3)-C耐火材料因碳含量的降低致使材料的抗氧化性能和抗侵蚀性能恶化,难以适应冶炼技术发展等问题,以电熔白刚玉、α-Al_(2)O_(3)微粉、Al粉、Si粉和鳞片石墨为主要原料,采用h-BN为添加剂制备低碳Al_(2)O_(3)-C耐火材料。研究h-BN的添加量(质量分数分别为0、1%、3%、5%)对低碳Al_(2)O_(3)-C耐火材料物相组成、抗氧化性能、抗侵蚀性能等的影响,并结合热力学模拟分析揭示h-BN对Al_(2)O_(3)-C耐火材料抗侵蚀性能的作用机制。结果表明:随着h-BN添加量的增加,试样经1 600℃热处理后内部陶瓷相含量增加;高温氧化环境下,h-BN促进了试样脱碳层中Al_(18)B_(4)O_(33)和Al_(6)Si_(2)O_(13)的生成,从而改善了耐火材料的抗氧化性能;h-BN通过提高熔渣黏度以及生成高熔点相来增强试样的抗侵蚀性能。This work aims at the decline in the oxidation resistance and corrosion resistance of low carbon Al_(2)O_(3)-C refractories caused by the reduced carbon content,which becomes challenging to adapt to development in smelting technology.To address this issue,low carbon Al_(2)O_(3)-C refractories were prepared using white fused corundum,α-Al_(2)O_(3) micropowder,Al powder,Si powder and flake graphite as the main raw materials,and h-BN as the additive.The effects of the h-BN addition(0,1%,3% and 5%,by mass) on the phase composition,oxidation resistance and corrosion resistance of the low carbon Al_(2)O_(3)-C refractories were studied.The mechanism of h-BN on the corrosion resistance of the Al_(2)O_(3)-C refractories was revealed by the thermodynamic simulation analysis.The results show that the ceramic phase content in the samples increases with the increase of the h-BN addition after heat treatment at 1 600 ℃;under high temperature oxidation environment,h-BN promotes the formation of Al_(18)B_(4)O_(33) and Al_(6)Si_(2)O_(13) in the decarburized layer of the sample,thus improving the oxidation resistance of the refractories;h-BN enhances the corrosion resistance of the sample by improving the slag viscosity and generating high melting point phases.

关 键 词：Al_(2)O_(3)-C耐火材料 H-BN 抗氧化性能 抗侵蚀性能 

分 类 号：TQ175[化学工程—硅酸盐工业]