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Synthesis and mechanical properties of low temperature sintered, Sm~(3+) doped nanoceria electrolyte membranes for IT-SOFC applications

机译:低温烧结掺杂Sm〜(3+)的纳米氧化铈电解质膜的合成及力学性能

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摘要

Nanocrystalline Ce_(0.9)Sm_(0.1)O_(1.95) electrolyte was prepared by nitrate-fuel combustion technique using urea, citric acid, glycine and polyethylene glycol as organic fuels. The combusted precursors were calcined at 700 ℃/2 h and then compacted to cylindrical pellets and sintered at 1200 ℃ for 2,4 and 6 h durations. The sintered samples were tested for the mechanical hardness and fracture toughness and the results were compared within the fuel sources. Dense nanocrystalline ceria electrolyte membranes having theoretical sintered densities of 98% and the sintered grain sizes below 1 μm were successfully achieved at 1200 ℃. Ceria electrolytes derived from the glycine and citric acid fuels have maximum microhardness of 7.94 ± 0.2 and 7.63 ± 0.2 GPa. Whereas high toughness is observed for the samples prepared from the urea and polyethylene glycol fuels. They were estimated as 3.06 ± 0.3 and 3.17 ± 0.3 MPa m~(1/2) respectively at 20 N. The study significantly contributes to select the fuels appropriately so that the advantages of low temperature densification and mechanically durability can be achieved in ceria electrolyte membranes for IT-SOFC applications.
机译:以尿素,柠檬酸,甘氨酸和聚乙二醇为有机燃料,通过硝酸盐燃烧技术制备了纳米Ce_(0.9)Sm_(0.1)O_(1.95)电解质。燃烧后的前体在700℃/ 2 h煅烧,然后压制成圆柱状颗粒,并在1200℃烧结2,4和6 h。测试了烧结样品的机械硬度和断裂韧性,并在燃料源中比较了结果。在1200℃成功制备了理论烧结密度为98%,烧结晶粒尺寸小于1μm的致密纳米氧化铈电解质膜。源自甘氨酸和柠檬酸燃料的二氧化铈电解质具有7.94±0.2和7.63±0.2 GPa的最大显微硬度。而从尿素和聚乙二醇燃料制备的样品中观察到高韧性。在20 N时,它们的估计值分别为3.06±0.3和3.17±0.3 MPa m〜(1/2)。该研究为正确选择燃料做出了重要贡献,从而可以在二氧化铈电解质中实现低温致密化和机械耐久性的优势。用于IT-SOFC应用的膜。

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