Tang Hai, Zhou Yuhao, Yuan Wenjie
The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China.
National-Provincial Joint Engineering Research Center of High Temperature Materials and Lining Technology, Wuhan University of Science and Technology, Wuhan 430081, China.
Materials (Basel). 2022 Jan 21;15(3):793. doi: 10.3390/ma15030793.
To investigate the action mechanism of titanium, the effects of different Ti-bearing compounds, including CaTiO, MgTiO, and nano-TiO, on the properties of alumina-magnesia castables were studied. By analyzing the phase compositions, microstructures, and physical and mechanical properties of the castables, it was demonstrated that an intermediate product, CaTiO, was first generated. This was then consumed by solid-solution reactions, and titanium was involved in the liquid formation as the temperature increased. The solid-solution reaction of CA (CaAlO) was more prominent due to the incorporation of more titanium in the crystal lattice of CA instead of spinel (MgAlO). Moreover, the liquid formation was strongly promoted when more titanium accompanied the calcium, which finally accelerated the densification and improved the strengths of alumina-magnesia castables. On the whole, castables with CaTiO addition presented higher bulk density and excellent strength after the heat treatment. Besides, the castables with 2 wt.% CaTiO contents were estimated to possess greater thermal shock resistance.
为了研究钛的作用机制，研究了不同含钛化合物，包括CaTiO、MgTiO和纳米TiO，对氧化铝-氧化镁浇注料性能的影响。通过分析浇注料的相组成、微观结构以及物理和力学性能，结果表明首先生成了中间产物CaTiO。然后它通过固溶反应被消耗，随着温度升高钛参与液相形成。由于更多的钛掺入CA（CaAlO）而非尖晶石（MgAlO）的晶格中，CA的固溶反应更为显著。此外，当更多的钛与钙共存时，液相形成受到强烈促进，最终加速了致密化并提高了氧化铝-氧化镁浇注料的强度。总体而言，添加CaTiO的浇注料在热处理后具有更高的体积密度和优异的强度。此外，估计含2 wt.%CaTiO的浇注料具有更好的抗热震性。
