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Registration Number

0222U002068, 0121U111474 , R & D reports

Title

Technology reprocessing of zirconia products with 10 % Y2O3 and pilot batches out put of zirconia products

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Head

Halchenko Tatiana Н., Кандидат технічних наук

Registration Date

09-02-2022

Organization

Joint Stock Company "The Ukrainian Research Institute of Refractories named after A. S. Berezhnoy"

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 Research object is zirconia (Z) products. Work purpose is technology improvement of Z-products with 10 % Y2O3. Researches methods are chemical, physical-mechanical, petrographic, X-ray phase ones. An influence of Al2O3 additive in the form of 3 grades alumina (calcined and 2 grades of active alumina) and their quantity (up to 4 %) on the main properties of Z-samples with 10 % Y2O3 fired at 1580 ºС was studied. The optimal amount of all studied grades of alumina was established, which ensures the production of fired samples with the highest properties: open porosity 19.8—20.5 %, apparent density 4.74—4.77 g/cm3, cold crushing strength 34—35 N/mm2, thermal shock resistance (1300 ºC — water) 13 thermal cycles. It was shown that, the using of Al2O3 additive in the form of 2 grades of active alumina does not lead to a significant increase in the main properties in comparison with similar characteristics of samples containing calcined alumina additive. Therefore, for economic reasons, preference was given to the latter. The Z-refractories with 10 % Y2O3 technology has been improved, which provides samples with a greater than 13.3 % (relative) cold crushing strength and more than 3.5 times thermal shock resistance (1300 ºC — water) in comparison with similar characteristics of Z-products which are made now. This will ensure a longer service life of Z-refractories in high-temperature units for consumers. Full-scale samples of industrial format products were made, which contain the calcined alumina additive and were characterized by above-mentioned properties and meet the requirements TS. Pilot batches of Z-products with properties that meet the requirements of TS were made and supplied to consumer on the foreign and domestic markets. Work should be continued in the direction of mastering the improved technology of Z-products (with 10 % Y2O3) with the Al2O3 additive and further improvement of the Z-refractories technology, expanding the volume of their production and use.

Product Description

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Belik Lyudmyla V.
Protsak Olena B.

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2022-03-09