Effect of micro-Al_(2)O_(3) powders on oxidation and corrosion behaviors of low-carbon MgO-C refractories  

作　　者：Yang Chen Zeng-yi Li Hao-bo Tan Yu-ran Fu Jun Ding Cheng-ji Deng Chao Yu 

机构地区：[1]School of Materials Science and Engineering,Hunan Institute of Technology,Hengyang 421002,Hunan,China [2]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

出　　处：《Journal of Iron and Steel Research International》2024年第6期1522-1534,共13页

基　　金：the Scientific Research Fund of Hunan Provincial Education Department(22B0856);the Hengyang"Xiaohe"Science and Technology Talent Special Project([2023]45);the Guidance Plan Project of Hengyang City([2023]40);the National Natural Science Foundation of China(U20A20239);the College Students'Innovation and Entrepreneurship Training Project(S202311528055);the Characteristic Application Discipline of Material Science Engineering in Hunan Province([2022]351).

摘　　要：To solve the problem of poor high-temperature service performance caused by low carbonization of MgO-C refractories,low-carbon MgO–C refractories with excellent thermal shock,oxidation and corrosion resistances were successfully designed by using SiC whiskers as reinforcing phases and introducing micro-Al_(2)O_(3) powders as additives.The results indicated that the addition of micro-Al_(2)O_(3) powders optimized the internal structure of the material,like the columnar β-Si_(3)N_(4) with a stepped distribution and the mosaic structure formed between granular and flaky Mg_(2)SiO_(4),which synergistically strengthened and toughened the material and gave the material excellent mechanical properties and thermal shock resistance.Specifically,the cold modulus of rupture and cold crushing strength after thermal shock were increased by 4.1 and 20.3 MPa,respectively.Moreover,the addition of micro-Al_(2)O_(3) powders promoted the formation of fine particles of Mg_(2)SiO_(4),MgAl_(2)O_(4) and MgO,as well as a dense protective layer of Mg_(2)SiO_(4) in the material under high-temperature environment.Furthermore,spinel and high-temperature solid solution were formed in the corrosion environment.The oxidation and corrosion resistances were greatly improved by 41%and 15%,respectively.

关 键 词：Low-carbon MgO-C refractory Oxidation resistance Corrosion resistance Thermal shock resistance Micro-Al_(2)O_(3)powder 

分 类 号：TG1[金属学及工艺—金属学]