Conclusions
A comparative evaluation of the methods of obtaining corundum suspensions with a glass phase was conducted. Three methods were studied: dry milling in a metallic vibrational mill followed by a HCl wash to remove the iron contaminant and subsequent suspension; suspension of a powder dry-milled in a vibrational mill having a corundum lining; and additional wet milling in an acidic medium using a corundum-lined ball mill.
It was established that wet milling of alumina with a glass phase in an acidic medium permits one to obtain castings having a strength twice higher after removing from the mold and 25–30 times higher after drying. In this case, the duration of the slip preparation processes decreases considerably.
The strength of the castings made from the wet-milled alumina increases rapidly with decreasing moisture content in them (hydraulic setting) in contrast to the strength of the castings obtained from the alumina powder that was dry milled in a metallic vibrational mill and acid-washed. This makes it possible to carry out machining of the dry unfinished product using diamonds and to decrease the number of rejections of intricate products by 30–35%.
It was shown that the increased strength of the castings obtained according to the third method is due to the retention (realization) of the binding properties of aluminum chlorides formed during the process of milling in the acidic medium and due to the formation of calcium hydrosilicates in the system.
The structure and the properties of the ceramics based on the castings obtained according to different methods are very close to each other.
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Translated from Ogneupory, No. 12, pp. 4–9, December, 1985.
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Pivinskii, Y.E., Skorodumova, E.B., Kabakova, I.I. et al. Evaluation of the production methods and the properties of corundum suspensions. Refractories 26, 651–658 (1985). https://doi.org/10.1007/BF01389987
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DOI: https://doi.org/10.1007/BF01389987