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Registration Number

0216U007286, 0115U001506 , R & D reports

Title

Improvement of production technology vibrocast mullitocorundum products and comparative trials in service the corundumzirconiasilicate, mullitocorundum, corundumspinel crucibles when melting super-alloys and production of pilot batches of products for different purposes.

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Head

Chaplianko S.,

Registration Date

17-06-2016

Organization

Public joint stock company "The Ukrainian research institute of refractories named after A.S.Berezhnoy"

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The object of the research is - vibrocasting refractories. The objective of the work is - Refine of production technology vibrocast mullitocorundum product and trials in service the corundumzirconiasilicate, mullitocorundum, corundumspinel crucibles when melting super-alloys. Research methods are - chemical, petrographic, physical-mechanical. The studies for improving manufacturing technology vibrocast mullitocorundum products by adding the active alumina (in an amount of 1, 2, 3 %) done. The regularities of vibration fluidity (spread-ability) mullitocorundum grainy mass investigated and established, with increasing content of the active bimodal and monomodal alumina in mass, increase in humidity, which provides the desired fluidity under vibration (80 - 100 %). The structure formation of mullitocorundum grainy mass investigated and established, with adding of the active alumina in mass, increase strength plastic of vibrocasting masses. By increasing the content of active alumina also increases the compressive strength of raw samples from 1,3 N/mm2 to 2,0; 2,8; 2,5 N/mm2 and 1,4; 2,3; 2,4 N/mm2 when using a bimodal and monomodal alumina, respectively. Properties of mullitocorundum samples (fired at temperatures of 1450°С; 1500°С; 1580°С) determined and established, that after firing at each of the investigated temperatures, with increasing content of the active alumina in mass, slight increase in open porosity and cold crushing strength at decrease permanent dimensions change when heated (1650 °С - 2 hour). The low value of the index permanent dimensions change when heated samples, that contain active bimodal alumina in an amount of 3 % and fired at 1450°С (-0,1 % vs. 1,9 % for the base charge), implies a decrease of the firing temperature (from 1580°С to 1450°С) for mullitocorundum articles not in contact with the molten alloy or glass. Comparative trials in service the corundumzirconiasilicate (brand КОЦСТ), mullitocorundum (brand МКТ), corundumspinel (brand КШТ) crucibles when melting nickel-based super-alloys in State Enterprise "Zorya"-"Mashproekt" done and showed that resistance crucibles, production of PJSC "THE URIR NAMED AFTER A. S. BEREZHNOY", increases in the series: КОЦСТ (19 heats) < КШТ (26 heats) ? МКТ (27 heats). Pilot batches of crucibles and semi-rings for induction melting of heat-proof alloys, revolving kiln furniture and elements of different furnace lining, refractories for glass-melting furnaces are made. Work should continue in the direction of improving production technology of mullitecorundum crucibles for induction furnaces, refractories for glass-melting furnaces and lining elements of different furnaces.

Product Description

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Грицюк Л.В.
Ткаченко Л.П.

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2020-04-02