Effect of TiO2 addition on microstructures and properties of MgO-CaO refractory aggregates

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外文摘要：MgO-CaO(40 wt.％CaO)refractory aggregates were prepared using the calcined dolomite and light-burned magnesia fine powder as raw materials and TiO2 as additive.The effect of TiO2 on their phase composition,microstructures and properties was investigated by X-ray diffraction and scanning electron microscopy.The properties such as bulk density,apparent porosity,relative aggregate tube strength and hydration resistance were also investigated.The results showed that the CaTiO3 generated by the reaction between CaO and TiO2 was distributed around the CaO grain boundaries and intermittently distributed with MgO,which formed an isolation layer around CaO and greatly improved the hydration resistance.Meanwhile,the introduction of TiO2 promoted sintering and increased the grain size,further improving the strengths and hydration resistance of the materials.In addition,the most significant enhancement in the hydration resistance and strengths of the samples was achieved when 1.0-2.0 wt.％TiO2 was added.In this case,the relative strength of aggregate increased from 33.3％to 37.3％-43.1％,and the mass gain after the hydration test decreased from 3.13％to 1.26％-1.45％.

外文关键词：

MgO-CaO refractory aggregateTiO2 additionPhase compositionMicrostructureHydration resistance

作者：

Shuai Zhang、Jing-ran Wang、Yuan-gao Li、Feng-you Li、Wen Yan、Hui-ying Shi

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作者单位：

The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,Hubei,China

Joint International Research Laboratory of Refractories and Metallurgy,Wuhan 430081,Hubei,China

Shanxi Luweibao Taigang Refractory Co.,Ltd.,Taiyuan 030003,Shanxi,China

基金：

Key Project of the National Natural Science Foundation of ChinaKey Project of the National Natural Science Foundation of ChinaHubei Science and Technology Innovation Talent Project

项目编号：

U21A2058518022352023DJC087

出版年：

2024

DOI：

10.1007/s42243-024-01247-w

钢铁研究学报(英文版)

钢铁研究总院

钢铁研究学报(英文版)

CSTPCD

影响因子：0.584

ISSN：1006-706X

年,卷(期)：2024.31(6)