Effect of Micro-sized CaCO3 Addition on Properties of Al2O3-Spinel Castables
Tabular alumina,fused spinel and reactive alumina were used as the main raw materials to prepare Al2O3-spinel castables with the introduction of micro-sized CaCO3(respectively adding 0,0.5 mass%,1.0 mass%,1.5 mass%and 2.0 mass%).The specimens were pre-heated at 110 ℃,1 000 ℃ and 1 550 ℃ respectively.Permanent linear change(PLC),hot modulus of rupture(HMOR)at 1 400 ℃ and thermal shock resistance(TSR)were tested.Also microstructure and phases of specimens was analyzed by SEM and XRD respectively.The results show that with micro-sized CaCO3 addition,micro-sized calcium hexaluminate grains(CaO·6Al2O3,hereinafter referred as CA6)generated in situ are distributed uniformly in matrix of castables,which embraces the spinel(MgO·6Al2O3,hereinafter referred as MA)and corundum grains,enhances the links of corundum-spinel-CA6 in matrix of castables.The formed three-dimensional network of CA6 in the castables influences the microstructure and consequently improves hot strength,volume stability and TSR of the castables.
Al2O3-spinel castables micro-sized CaCO3 CA6 hot modulus of rupture (HMOR) thermal shock resistance (TSR)
HU Shuhe LI Na CHEN Anbang CHEN Liugang DING Dafei YE Guotian
Henan Key Laboratory of High Temperature Functional Ceramics,School of Materials Science and Enginee Henan Key Laboratory of High Temperature Functional Ceramics,School of Materials Science and Enginee
国际会议
Conference on Refractories International 2018, CRI2018)(2018国际耐火材料学术会议)
杭州
英文
1-12
2018-10-17（万方平台首次上网日期，不代表论文的发表时间）