Processes in the formation of direct intergrain bonds in periclase-spinel refractories
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In order to obtain periclase-spinel refractories of high quality it is necessary to use chemically pure magnesite and chromite powders, and also high firing temperatures. In the high-fired periclase-spinel refractories made from these powders a quantitatively new structure is formed: the direct bonds between the crystals of periclase and chrome spinel predominate (more than 50%). The secondary spinels, fulfilling the role of bond in the grains of periclase, possess a high melting point.
In the periclase-spinel refractories containing more than 2% silica the intergrain bonds are formed as a result of the mixed solid-liquid sintering with localized crystallization of new formations of periclase and spinel from the melt. This type of process does not ensure a sufficiently high number of direct bonds between the crystals, and weakens the structure of the products by the presence of silicate interlayers.
KeywordsCrystallization Periclase Silicate Chrome Chromite
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