ONPP “Technologiya” named after A. G. Romashin (Obninsk, Russia):

M. A. Maizik, Engineer Technologist, e-mail: mar-majzik@yandex.ru
D. V. Kharitonov, Deputy Director on Production

D. Mendeleev University of Chemical Technology of Russia (Moscow, Russia):

D. O. Lemeshev, Cand. Eng., Associate Prof., Dean of the Faculty of Technology of inorganic substances and high-temperature materials
D. Yu. Zhukov, Cand. Eng., Associate Professor, Advisor to the Rector

Ceramic materials based on zirconium dioxide, which are promising for use in the metallurgical industry, in particular, as pouring nozzles for a continuous casting machines (CCM) for casting carbon and heat-resistant steels, are considered. The following materials were obtained as initial materials for the further manufacture of pouring nozzles, % (wt.): (ZrO₂ – 2 MgO; ZrO2 – 2 MgO – 1 SiO₂; ZrO₂ – 2 MgO – 1 SiO₂ – 0.5 Fe₂O₃). Products were obtained by isostatic pressing using a temporary technological binder based on polyvinyl alcohol. The samples were
sintered in an air atmosphere at T = 1700 °C with holding for 1 h. The thermal resistance of the inserts was determined in accordance with GOST 7875.0–2018. It was found that the composition ZrO₂ – 2 % (wt.) MgO – 1 % (wt.) SiO₂ – 0.5 % (wt.) Fe₂O₃ has better performance in comparison with other investigated compositions. It was revealed that the precipitation of a small lens-like tetragonal phase in a large grain of the monoclinic phase contributes to a significant increase in the number of passed thermal cycles.
The work was carried out with the financial support of the D. Mendeleev UCTR. Project number G-2020-21.

1. E. A. Korableva, V. S. Jakushkina, E. V. Nekrasov, N. N. Savanina, M. Yu. Rusin et. al. Electrochemical element and method for its manufacturing. Patent RF No. 2379670. Applied: 17.10.2008. Published: 20.01.2010. Bulletin No. 2.
2. Korableva Е. А., Mayzik М. А., Savanina N. N. Formation of film structures of solid electrolyte. Novye ogneupory. 2014. No. 10. pp. 47–50.
3. Tao L. A review of high-temperature electrochemical sensors based on stabilized zirconia. Solid State Ionics. 2015. Vol. 283. pp. 91–102.
4. Persson A., Khaji Z., Klintberg L. Dynamic behaviour and conditioning time of a zirconia flow sensor for high-temperature applications. Sensors and Actuators A: Physical. 2016. Vol. 251. pp. 59–65.
5. Bardakhanov S. P., Emelkin V. А., Lysenko V. I., Nomoev А. V., Trufanov D. Yu. Obtaining and properties of ceramics from zirconium dioxide nanopowder. Fizika i khimiya stekla. 2009. Vol. 35. No. 5. pp.710–712.
6. Amiel S., Copin E., Sentenac T. et al. On the thermal sensitivity and resolution of a YSZ:Er3+/YSZ:Eu3+ fluorescent thermal history sensor. Sensors and Actuators A: Physical. 2018. Vol. 272. pp. 42–52.
7. Liu H., Jiang S., Zhao X. et al. YSZ/Al₂O₃ multilayered film as insulating layer for high temperature thin film strain gauge prepared on Ni-based superalloy. Sensors and Actuators A: Physical. 2018. Vol. 279. pp. 272–277.
8. Eichler J., Eisele U., Rodel J. Mechanical Properties of Monoclinic Zirconia. Journal of the American Ceramic Society. 2004. Vol. 87, Iss. 7. pp. 1401–1403.
9. Bocanegra-Bernal M. H., Díaz de la Torre S. Phase transitions in zirconium dioxide and related materials for high performance engineering ceramics. Journal of Material Science. 2002. Vol. 37. pp. 4947–4971.
10. Grosso R., Muccillo E. N. S., Castro R. H. R. Phase stability in scandiazirconia nanocrystals. Journal of the American Ceramic Society. 2017. Vol. 100, Iss. 5. pp. 2199–2208.
11. Gibson I. R. Qualitative X-ray Diffraction Analysis of Metastable Tetragonal (t*) Zirconia. Journal of the American Ceramic Society. 2001. Vol. 84, Iss. 3. pp. 615–618.
12. Glymond D., Vick M. J., Giuliani F. High-temperature fracture toughness of mullite with monoclinic zirconia. Journal of the American Ceramic Society. 2017. Vol. 100, Iss. 4. pp. 1570–1577.
13. GOST 2409–2014. Refractories. Method for determination of bulk density, apparent and true porosity, water absorption. Introduced: 01.09.2015.
14. GOST 7875.0–2018. Refractory products. Basic requirements for methods of thermal shock resistance determination. Introduced: 01.04.2019.