作者：J.-M. Auvray, C. Wohrmeyer, S. Li, C. Parr, H. Fryda

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刊名：refractories worldforum

ISSN：

出版年：2013-10-01

卷：5

期：4

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语种：英文

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内容简介

Calcium magnesium aluminate (CMA) is a novel binder for steel ladle castables. It was reported previously that CMA has hydraulic properties and is beneficial in the matrix of castables to prevent ladle slag penetration and corrosion [1, 2]. The CMA grain contains microcrystalline magnesium aluminate spinel which is homogeneously distributed between hydraulic calcium aluminate phases. Applied in castables it develops an unique microspinel matrix. This study presents further application studies of magnesia containing castables based upon CMA. Both pre-formed magnesium aluminate spinel and magnesia are combined in different model systems. The matrix spinel contained within the model castables is derived from fused spinel, sintered spinel and combined with different quantities of spinel from CMA. At equal CaO contents CMA develops the same strength after drying but higher strength after firing is found than with a reference system of calcium aluminate cement (CAC) + spinel. This is assumed to be the effect of a higher sintering reactivity of the microspinel in CMA.