The restructuring-sintering mechanism of calcium alumino-titanate in tundish permanent lining castables
The restructuring-sintering mechanism of calcium alumino-titanate in tundish permanent lining castables
复制标题
中间包永久衬浇注料中铝钛酸钙的重组-烧结机理
DOI：
10.1016/j.ceramint.2020.08.102
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发表时间：
2020-12
影响因子：
5.2
通讯作者：
Feng Li
中科院分区：
文献类型：
--
作者：
Li Yichong;Zhao Huizhong;Yang Yang;Feng Zecheng;Zhang Han;Yu Jun;Liu Yanli;Feng Li
铝钛酸钙（CAT）是一种应用广泛的耐火材料原料。它是通过回收有色冶金固体废物获得的，通常用于高温氧化环境。CAT的主晶相为Ca（Al，Ti）12 O 19，在高温氧化环境下不稳定，优先形成新的相系。在本研究中，CAT原料在空气中预烧以促进Ca（Al，Ti）12 O 19在空气中重构为CaAl 12 O 19的过程。研究了预烧CAT原料对浇注料力学性能和导热性能的影响，并在此基础上提出了预烧CAT骨料的重构-烧结机理。在1400 °C下烧制3小时后，这些样品显示出比使用CAT原料制备的那些更大的体积收缩率和更高的机械强度。使用预烧CAT原料减少了钙长石在浇注料基质中的形成，从而减少了基质中液相转移形成的孔隙;然而，它导致浇注料具有比使用未烧CAT原料制备的浇注料更高的热导率。
Calcium alumino-titanate (CAT) is widely used as a refractory raw material in China. It is obtained by the recycling of non-ferrous metallurgical solid waste and is often used in high-temperature oxidizing environments. The main crystal phase of CAT is the Ca(Al,Ti)12O19, which is unstable under high temperature oxidizing environments and preferentially forms a new phase system. In this study, CAT raw materials were prefired in air to facilitate the reconstructing process from Ca(Al,Ti)12O19to CaAl12O19in air. Herein, the effects of the prefiring of CAT raw materials on the mechanical properties and thermal conductivity of tundish permanent lining castables were studied and mechanism of restructuring-sintering of CAT aggregates in this process was proposed based on it. The results showed that the use of prefired CAT raw materials reduced the bulk density and mechanical strength of the castable samples after baking at 110 °C for 24 h. After firing at 1400 °C for 3 h, these samples showed greater volume shrinkage and higher mechanical strength than those prepared using CAT raw materials. The use of prefired CAT raw materials reduced the formation of anorthite in the castable matrix, thereby reducing the pores formed by liquid–phase transfer in the matrix; however, it resulted in castables with higher thermal conductivity than those prepared using unfired CAT raw materials.
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影响因子：
1.8
作者：
A. Wittmann;K. Seifert;H. Nowotny
通讯作者：
A. Wittmann;K. Seifert;H. Nowotny
影响因子：
5.2
作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
通讯作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
影响因子：
5.2
作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
通讯作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
影响因子：
5.2
作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
通讯作者：
C. Jianwei;Huizhong Zhao;Han Zhang;Zhen-Gang Li;Jiaqin Zhang
影响因子：
5.2
作者：
Pengda Zhao;Han Zhang;G. Hongjun;Zhu Yuqian;Jun-Ling Yu;Fan Rundong-;Huizhong Zhao
通讯作者：
Pengda Zhao;Han Zhang;G. Hongjun;Zhu Yuqian;Jun-Ling Yu;Fan Rundong-;Huizhong Zhao