High-energy ball milling and spark plasma sintering of molybdenum - lanthanum oxide (Mo-La2O3) and molybdenum – lanthanum zirconate (Mo-La2Zr2O7) composite powders

材料科学 微观结构 复合数 烧结 放电等离子烧结 陶瓷 球磨机 冶金 氧化镧 粉末冶金 氧化物 复合材料 无机化学 化学
作者
Ladislav Čelko,Serhii Tkachenko,Mariano Casas-Luna,Lucie Dyčková,Vendula Bednaříková,Michaela Remešová,Pavel Komarov,Andrea Deák,Matěj Baláž,Deborah E. Crawford,S.D. De la Torre,Ede Bodoki,Jaroslav Cihlář
出处
期刊:International Journal of Refractory Metals & Hard Materials [Elsevier BV]
卷期号:102: 105717-105717 被引量:8
标识
DOI:10.1016/j.ijrmhm.2021.105717
摘要

The 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.
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