Influence of h-BN particle size on fracture behavior and thermal shock resistance of Al2O3-C refractories  

作　　者：Zi-xu Ji Wen-jing Liu Ning Liao Ya-wei Li Tian-bin Zhu 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China [2]National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan 430081,Hubei,China [3]School of Chemical Engineering,Qinghai University,Xining 810016,Qinghai,China

出　　处：《Journal of Iron and Steel Research International》2022年第7期1129-1137,共9页

基　　金：This work was supported financially by the National Natural Science Foundation of China(NSFC,Grant Nos.51872211 and 51702065);the Special Project of Central Government for Local Science and Technology Development of Hubei Province(2019ZYYD003 and 2019ZYYD076).

摘　　要：h-BN can be applied in Al_(2)O_(3)–C refractories to substitute graphite due to their similar crystal structure and better resistance to molten steel and oxidation.The effects of h-BN particle size on the mechanical properties and fracture behavior of Al_(2)O_(3)–C refractories were investigated through wedge splitting test and microstructural analyses.The obtained results demonstrated that the addition of larger-sized h-BN was conducive to the growth of in situ formed SiC whiskers,which contributed to the highest flexural strength(42.63±3.10 MPa)of specimen D10.In comparison,the smaller-sized h-BN can induce more crack propagation paths along the interface and within matrix,leading to more tortuous crack propagation paths,and thus the thermal shock-related parameters such as specific fracture energy,characteristic length,and thermal shock resistance were improved.Consequently,the residual strength ratio of Al_(2)O_(3)–C refractories was increased from 35.5%to 42.5%with decreasing the h-BN particle size from 10 to 0.1μm.

关 键 词：Al_(2)O_(3)–C refractory H-BN Fracture behavior Thermal shock resistance 

分 类 号：TQ175[化学工程—硅酸盐工业]