具有固体氧化物电池应用潜力的热喷涂多层陶瓷结构

M. Vardavoulias, P. Gkomoza, M. Arkas, D. Niakolas, S. Neophytides
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引用次数: 1

摘要

本文的目的是通过大气等离子体喷涂工艺(APS)制造独立的固体氧化物电池(soc),而不需要金属支架的帮助,也不需要后处理加热。制作了一个五层细胞。采用5-22 μm的钇稳定氧化锆(YSZ)粉末进行熔合和粉碎,以获得致密的电解质层,同时仍然具有令人满意的离子扩散系数。将纯镍(Ni)粉末经内部火焰喷涂(FS)氧化得到的氧化镍(NiO)粉末与原Ni- ysz原料混合喷涂,以增加支撑电极的孔隙率。喷涂了两个过渡层,第一个在支撑电极和电解质之间(25% (Ni/NiO) -75% YSZ),第二个在电解质和端电极界面(50% YSZ - 50%镧锶锰矿(LSM))。这些过渡层的插入目的是为了促进离子运动,并消除热膨胀不匹配。通过内部开发的丙酮渗透率比较测试(APCT)对所有喷涂层进行了单独测试。获得具有足够孔隙率(25-30%)的电极。电解液方面,熔融破碎后的YSZ较厚(150-200µm)层对丙酮不渗透,而较薄(小于100µm)的YSZ层渗透性较低,这主要是由于存在微裂纹和颗粒间凝聚力不足,而不是相互连接的孔隙。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermal Spray Multilayer Ceramic Structures with Potential for Solid Oxide Cell Applications
The objective of this paper is to manufacture free-standing solid oxide cells (SOCs) through the atmospheric plasma spray process (APS), without the aid of a metallic support nor the need for a post-process heating treatment. A five-layered cell was fabricated. Fused and crushed yttria-stabilized zirconia (YSZ) powder in the 5–22 μm particle size range was used in order to achieve a dense electrolyte layer, yet still permitting satisfactory ionic diffusivity. Nickel oxide (NiO) powder that was obtained by in-house flame spray (FS) oxidation of pure nickel (Ni) powder was mixed and sprayed with the original Ni-YSZ feedstock, so as to increase the porosity content in the supporting electrode. Two transition layers were sprayed, the first between the support electrode and the electrolyte (25% (Ni/NiO)–75% YSZ) and the second at the electrolyte and the end electrode interface (50% YSZ–50% lanthanum strontium manganite (LSM)). The purpose of intercalation of these transition layers was to facilitate the ionic motion and also to eliminate thermal expansion mismatches. All the as-sprayed layers were separately tested by an in-house developed acetone permeability comparative test (APCT). Electrodes with adequate porosity (25–30%) were obtained. Concerning electrolytes, relatively thick (150–200 µm) layers derived from fused and crushed YSZ were found to be impermeable to acetone, while thinner YSZ counterparts of less than 100 µm showed a low degree of permeability, which was attributed mostly to existent microcracks and insufficient interparticle cohesion, rather than to interconnected porosity.
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