Al2O3/ZrO2 Materials as an Environmentally Friendly Solution for Linear Infrastructure Applications |
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| Authors: | Justyna Zygmuntowicz,Radosł aw Ż urowski,Justyna Tomaszewska,Marcin Wachowski,Janusz Torzewski,Paulina Piotrkiewicz,Michał Gloc,Katarzyna Konopka |
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| Affiliation: | 1.Faculty of Materials Science and Engineering, Warsaw University of Technology, 141 Woloska St., 02-507 Warsaw, Poland; (P.P.); (M.G.); (K.K.);2.Faculty of Chemistry, Warsaw University of Technology, 3 Noakowskiego St., 00-664 Warsaw, Poland;3.Instytut Techniki Budowlanej, Ksawerów 21, 02-656 Warsaw, Poland;4.Faculty of Mechanical Engineering, Military University of Technology, 2 gen. S. Kaliskiego St., 00-908 Warsaw, Poland; (M.W.); (J.T.) |
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| Abstract: | The present work deals with the evaluation of the effect of ZrO2 on the structure and selected properties of shapes obtained using the centrifugal slip casting method. The samples were made of alumina and zirconia. The applied technology made it possible to produce tubes with a high density reaching 99–100% after sintering. Very good bonding was obtained at the Al2O3/ZrO2 interphase boundaries with no discernible delamination or cracks, which was confirmed by STEM observations. In the case of Al2O3/ZrO2 composites containing 5 vol.% and 10 vol.% ZrO2, the presence of equiaxial ZrO2 grains with an average size of 0.25 µm was observed, which are distributed along the grain boundaries of Al2O3. At the same time, the composites exhibited a very high hardness of 22–23 GPa. Moreover, the environmental influences accompanying the sintering process were quantified. The impacts were determined using the life cycle analysis method, in the phase related to the extraction and processing of raw materials and the process of producing Al2O3/ZrO2 composites. The results obtained show that the production of 1 kg of sintered composite results in greenhouse gas emissions of 2.24–2.9 kg CO2 eq. which is comparable to the amount of emissions accompanying the production of 1 kg of Polyvinyl Chloride (PVC), Polypropylene (PP), or hot-rolled steel products. |
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| Keywords: | Al2O3/ZrO2 composites life cycle analysis centrifugal slip casting |
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