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Information × Registration Number 0225U001283, (0124U005244) , R & D reports Title Development of the technology of zirconia, stabilized by a combined addition of calcium and yttrium oxides, phosphate-bonded ramming mass, and pilot batches output of zirconia powders for plasma coating and magnesia-chromite powders popup.stage_title Розробка технології цирконійоксидної, стабілізованої комбінованою добавкою оксидів кальцію та ітрію, набивної маси на фосфатній зв’язці та випуск дослідних партій цирконійоксидних порошків для плазмового напилення і магнезіально-хромітних порошків Head Shulyk Iryna H., Кандидат технічних наук Registration Date 29-01-2025 Organization Joint Stock Company "The Ukrainian Research Institute of Refractories named after A. S. Berezhnoy" popup.description1 Development of the technology of zirconia, stabilized by a combined addition of calcium and yttrium oxides, phosphate-bonded ramming mass popup.description2 The research object is zirconia, stabilized by a combined additive of calcium and yttrium oxides, a ramming mass with a phosphate bond. The purpose is to develop a zirconia technology, stabilized by a combined additive of CaO and Y2O3, ramming mass on a phosphate bond. The research methods were chemical, physical-mechanical, petrographic, and XRD. A new fused material was obtained from ZrO2 stabilized with the additive in a given ratio. Its chemical and phase compositions and main property parameters were determined. The influence of stabilizing additive type (CaO or CaO+Y2O3) and the amount of monoclinic ZrO2 additive (20 and 30 %) on the basic properties, phase composition, and structure of mass samples after heat treatment in the range of 200—2400 °C was studied. It was found that the complete interaction of P2O5 with the aggregate and fine binder occurs in the range of 1200—1400 °C and is manifested in a significant destabilization of the ZrO2 cubic phase, but this does not lead to a sharp hardening of the samples. Increasing the temperature to 1750—2400 °C causes the phosphates decomposition and leads to the ZrO2 re-stabilization, which contributes to the strengthening of samples by sintering. It was found that the samples with an additive of 20 % monoclinic ZrO2 have the highest properties: after firing at 2400 °C, open porosity is 14.5 %, apparent density is 4.87 g/cm3, and CCS is 121 N/mm2. A new product type was developed — zirconia, stabilized by a combined additive of CaO and Y2O3, a phosphate-bonded ramming mass. It is recommended for use at a service temperature of 2400 °C. JSC “URIR named after A.S. Berezhnoy” manufactured and supplied to the domestic and foreign markets pilot batches of zirconia powders for plasma spraying with properties that meet the requirements of specifications and contract terms, and magnesia-chromite powders with properties that meet the consumer requirements. Work will continue on further improvement of zirconia masses.  Product Description popup.authors Bielik Liudmyla V. Halchenko Tetiana H. Protsak Olena B. popup.nrat_date 2025-01-29 Close