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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Suspension and solution plasma spraying of finely structured layers: potential application to SOFCs
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Suspension and solution plasma spraying of finely structured layers: potential application to SOFCs

机译：精细结构层的悬浮液和溶液等离子喷涂：对SOFC的潜在应用

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Suspension direct current plasma spraying allows achieving finely structured coatings whose thickness is between few tens and few hundreds of micrometres. Drops (200–300 μm in diameter) or liquid jets are mechanically injected in the plasma jet. With radial injection they are rapidly (a few μs) fragmented into droplets (a few μm in diameter). The latter are vaporized (in a few μs) and the solid particles contained in suspension droplets are accelerated and melted by the plasma jet. As in conventional plasma spraying (CPS), much smaller splats (with diameters between 0.2 and 3 μm and thicknesses between 30 and 200 nm) are arranged in layers up to form the coating. The low inertia of particles requires spray distances between 40 and 60 mm which induces plasma heat fluxes up to 22 MW m?2 participating in coating densification. Even more than in CPS, the plasma jet fluctuations, particularly for plasmas containing di-atomic gases, perturb drops penetration and fragmentation. It has been chosen to illustrate difficulties and possibilities of this new method, through the spraying of the three layers of an element of solid oxide fuel cells. Indeed, it requires a dense stabilized zirconia electrolyte, if possible thin (15–20 μm) with two porous electrodes: cathode made of perovskite prone to decomposing upon spraying and anode made of two materials (nickel and zirconia) with very different melting points. These components were obtained by spraying ethanol suspensions, with, first, LaMnO3 perovskite particles doped with 10 mol% of MnO2 and 3 μm in mean diameter sprayed with pure argon to limit their decomposition and achieve porous coatings, second, Yttria (13 wt%) stabilized zirconia (YSZ) with two different particle size distributions and morphologies for which plasma compositions were adapted, producing in both cases 15 μm thick and fully dense coatings, third, porous Raneigh nickel by co-spraying the YSZ suspension and solution of nickel nitrate.
机译：悬浮直流等离子喷涂可以实现厚度在几十到几百微米之间的精细结构的涂层。将液滴（直径为200–300μm）或液体喷嘴机械注入等离子喷嘴中。通过径向注射，它们会迅速（几微秒）碎成小滴（直径为几微米）。后者被蒸发（在几微秒内），悬浮液滴中所含的固体颗粒通过等离子流加速并熔化。与传统的等离子喷涂（CPS）一样，将小得多的小片（直径在0.2到3μm之间，厚度在30到200 nm之间）分层排列以形成涂层。颗粒的低惯性需要40至60 mm的喷射距离，这会引起高达22 MW m？2的等离子体热通量参与涂层的致密化。甚至比CPS中的等离子体喷射波动更大，特别是对于包含双原子气体的等离子体而言，扰动液滴的渗透和破碎。选择通过喷涂固体氧化物燃料电池的三层元件来说明这种新方法的困难和可能性。实际上，它需要一种致密的稳定的氧化锆电解质，如果可能的话，它要薄（15–20μm），并带有两个多孔电极：由钙钛矿制成的阴极在喷涂时易于分解，而阳极由两种熔点不同的材料制成（镍和氧化锆）。这些成分是通过喷涂乙醇悬浮液而获得的，首先，将掺有10 mol％MnO2和平均直径为3μm的LaMnO3钙钛矿颗粒喷涂纯氩气以限制其分解并获得多孔涂层，其次是氧化钇（13 wt％）稳定的氧化锆（YSZ），具有两种不同的粒径分布和形态，可适应等离子体组成，在两种情况下均通过共同喷涂YSZ悬浮液和硝酸镍溶液产生15μm厚且完全致密的涂层，第三种多孔Raneigh镍。

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