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Information × Registration Number 0221U104640, 0120U103539 , R & D reports Title Technology reprocessing of vibrocast mullite corundum refractories and pilot batches out put of crucibles for induction furnaces, circulating refractories and lining elements of different furnaces, refractories for glass melting furnaces popup.stage_title Head Kushchenko Karina I., Кандидат технічних наук Registration Date 05-04-2021 Organization Joint Stock Company "The Ukrainian Research Institute of Refractories named after A. S. Berezhnoy" popup.description2 The research object is mullite alumina crucibles; ZrO2 additive; tabular alumina. The purpose of the work is improvement of vibrocast mullite alumina crucibles technology. The research methods are chemical, petrographical, physicomechanical and thermophysical ones. Researches to improve the technology of mullite alumina crucibles were carried out. The effect of type ZrO2 in the form of zircon concentrate or baddeleyite powder on the main properties of vibrocast samples after firing at 1580 °C were studied. The efficiency of ZrO2 in the form of zircon concentrate was established. According to the research results, pilot batches of mullite alumina crucibles with 10 % ZrO2 were made for transfer to comparative tests when melting in a vacuum induction furnace. The influence of tabular alumina, introduced instead of electroalumina into the mass, and the amount of zircon concentrate and quartz additions on the properties of vibrocast samples of mullite alumina refractories with 10 and 20 % ZrO2 after firing at 1580 °C were investigated. It was shown that, the introduction of 5 % quartz into the composition of mullite alumina samples with 10 % ZrO2 provides the highest their properties after firing at 1580 °C. It was established that, the change amount fraction of tabular alumina 0.5–0 and 0.25–0 mm in the series 0→7.5→10 % and 15→7.5→5 % provides after firing the mullite alumina samples with 20 % ZrO2 the highest their properties. So, the possibility of replacing fused electroalumina with tabular alumina was established. As a result of researches, the technology of vibrocast mullite alumina products with 10 and 20 % ZrO2 was improvement. In accordance with the terms of contracts at JSC “The URIR named after A.S. Berezhnoy” the pilot batches of highly refractory products were produced, which were transferred to consumers in the amount of financing. The work should be continued in the direction of further improvement the technology of vibrocast highalumina refractories  Product Description popup.authors Belik Lyudmyla V. Kostyrko Inna Yu Krakhmal Yuliya O. Mishnova Yuliia Y. Tkachenko Lyudmyla P. popup.nrat_date 2021-04-05 Close