首页|High-energy ball milling and spark plasma sintering of molybdenum - lanthanum oxide (Mo-La2O3) and molybdenum – lanthanum zirconate (Mo-La2Zr2O7) composite powders
High-energy ball milling and spark plasma sintering of molybdenum - lanthanum oxide (Mo-La2O3) and molybdenum – lanthanum zirconate (Mo-La2Zr2O7) composite powders
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NSTL
Elsevier
? 2021 Elsevier LtdThe current study is focused on the preparation of Mo-10 vol%La2O3 and Mo-10 vol% La2Zr2O7 composite powders via low- and high-energy ball milling approaches as potential candidates for near-future high-temperature structural applications. The mechanical milling parameters play a critical role on the final powder's microstructure. When using the high-energy milling mode (using 800 rpm, ball-to-powder ratio (BPR) 100: 6), the homogeneous powder agglomerates are formed with refined laminated microstructure and more uniform ceramic phase distribution in both Mo-La2O3 and Mo-La2Zr2O7 systems compared to the powders produced by means of the low-energy milling mode (using 350 rpm, BPR 100: 6), where inhomogeneous powder mixture with less embedding of ceramic phases into Mo agglomerates was obtained. This study also focuses on the evaluation of high-temperature phase and microstructural stability of the produced composite powders treated at the temperature of 1300 °C under the different gaseous environments, including ambient, inert and reducing atmospheres. The Mo-10 vol% La2Zr2O7 composite powder exhibited better thermal stability during the high-temperature exposure in all tested atmospheres in comparison with the Mo-La2O3 composite powder, since it revealed less intensive formation of the intermediate phases, such as lanthanum oxymolybdates. Therefore, the Mo-10 vol% La2Zr2O7 composite powder was used further for consolidation by means of spark plasma sintering at 1600 °C. The successful production of Mo-La2Zr2O7 composite with homogeneous distribution of ceramic phase, the grain size about of 5 μm, and hardness of 3.4 GPa was not reported so far.
Central European Institute of Technology Brno University of Technology
Research Centre for Natural Sciences Institute of Materials and Environmental Chemistry Supramolecular Chemistry Research Group E?tv?s Loránd Research Network (ELKH)
Department of Mechanochemistry Institute of Geotechnics Slovak Academy of Sciences
School of Chemistry and Biosciences University of Bradford
CIITEC - Centro de Investigación e Innovación Tecnológica Instituto Politécnico Nacional
Department of Analytical Chemistry Iuliu Ha?ieganu University of Medicine and Pharmacy
NSTL
Elsevier
