Regulation of Pore Structure and Hightemperature Fracture Behavior of CACbonded Alumina-Spinel Castables Based on Hydration Design  

作　　者：Wenjing LIU Ning LIAO Yawei LI 

机构地区：[1]The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China [2]National-provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology,Wuhan 430081,China [3]Joint International Research Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China

出　　处：《China's Refractories》2024年第3期22-29,共8页中国耐火材料（英文版）

基　　金：supported financially by the Natural Science Foundation of Qinghai(2022-ZJ-928);the Special Project for Transformation of Scientific and Technological Achievements of Qinghai Province(2023-GX-102).

摘　　要：The lamellar hydrates of CAC were designed with the introduction of nano CaCO_(3)or Mg-Al hydrotalcite(M-A-H),and the effects on the green strength,pore structures,and high-temperature fracture behavior of alumina-spinel castables were investigated.The results show that nano CaCO_(3)or M-A-H stimulates rapidly the hydration of CAC and the formation of lamellar C_(4)AcH_(11)or coexistence of C_(2)AH_(8)and C_(4)AcH_(11)at 25℃.The formation of lamellar hydrates can contribute to a more complicated pore structure,especially in the range of 400-2000 nm.Meanwhile,the incorporation of well-distributed CaO or MgO sources from nano CaCO_(3)or M-A-H also regulates the distribution of CA_(6)and spinel(pre-formed and in-situ).Consequently,the optimized microstructure and complicated pore structure can induce the deflection and bridging of cracks,thus facilitating the consumption of fracture energy and enhancing the resistance to thermal stress damage.

关 键 词：alumina-spinel castables lamellar hydrates pore structure high-temperature wedge splitting test fracture behavior 

分 类 号：TQ175.732[化学工程—硅酸盐工业]