The European Ceramic Society
YCN Newsletter 15: "Obtaining transparent yttrium-containing ceramics of complex shapes by slip casting" by Dariia Chernomorets
My name is Dariia Chernomorets and I am a second-year PhD student in Materials Science at the Institute for Single Crystals, NAS of Ukraine (Kharkiv, Ukraine).
I started my PhD research in Kharkiv in 2021, but since it is impossible to continue work at home Institute because of Russian invasion of Ukraine, I received support from JECS Trust and CNR-ISSMC (former ISTEC) (Italy). I have been working at CNR-ISSMC for 5 months and continue my research in Italy.
My scientific work focuses on obtaining transparent yttrium-containing ceramics of complex shapes by slip casting. As you might guess, this process is full of challenges. For instance, slips should have a high solid loading, be stable, and have a Newtonian fluid behaviour at the same time. But the high specific surface area of nano-Y2O3 complicates an experiment. Just imagine, 1 g of nano-Y2O3 powder has the surface area comparable to 1/16 of a tennis field! This leads to a rather large volume of powder, which makes this experiment really challenging for ceramists. In my work I aim to find ways to solve these problems. For this purpose, I investigate how the variation of dispersants and their concentration affect the stability and rheology of slips, which conditions of preparing slips are optimum, etc., in order to reach a full density, necessary for high transparency.
In one of my projects, our group from Ukraine worked on obtaining Y2O3-MgO 50:50 composite nanoceramics by aqueous slip casting. For this purpose, I synthesized the initial powder with the average particle size of 40 nm and a specific surface area of approximately 25 m2/g by sol-gel method. The influence of dispersants type and concentration variation on the slip properties was investigated to reach optimum conditions for obtaining highly dense transparent ceramics. As far as the dispersants are polymeric substances, a high concentration can lead to the formation of pseudoplastic slips but the low value can be the reason for the system instability. This research was presented at the Shaping 8 Conference in Dübendorf, in 2022. I am only at the beginning of my scientific journey, but as a result of my research, I would like to find a more or less universal approach to the formation of complex-shaped Y2O3-MxOy transparent ceramics.
Since working with ceramics requires different points of view from many scientific areas and exchanging of experience, I`m open to discussion. So please don’t hesitate to contact me at an in-person meeting or online.
Currently, I carry out my research abroad and I am happy to have this opportunity because it`s important to keep on PhD research and develop the science even during the war.
Finally, I would like to add one important thing. Nowadays, Ukrainian, in particular scientists, continue to live and work in quite complicated conditions. I want to support my colleagues and express admiration for their dedicated work in such a difficult time.
Institute for Single Crystals, NAS of Ukraine,
60 Nauky Ave., Kharkiv, 61072, Ukraine.
CNR-ISSMC, Via Granarolo 64, Faenza, 48018, Italy
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