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首页> 外文会议>International symposium on solid oxide fuel cells >OPTIMIZING LANTHANUM CHROMITE INTERCONNECTS FOR SOLID OXIDE FUEL CELLS
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OPTIMIZING LANTHANUM CHROMITE INTERCONNECTS FOR SOLID OXIDE FUEL CELLS

机译：优化铬铁矿互连固体氧化物燃料电池

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Optimizing the composition of strontium substituted lanthanum chromites to minimize expansion is not straightforward and must be done carefully to avoid compromising sinterability, electrical conductivity, and mechanical strength. In this study, a variety of lanthanum strontium cnromites were modified with V, Cu, and Mg to allow densification in air at 1500°C, and their materials properties were evaluated. Both additives (～5 mole % V and 2 mole% Cu) resulted in full densification of Sr substituted (10 and 15 mole%) lanthanum chromite. Of the compositions evaluated,only La_(0.85)Sr_(0.15)Cr_(0.95)V_(0.05)O_3 appeared to be a promising interconnect material, showing <0.1% expansion at 10~(-16) atm. While the coefficient of thermal expansion was less than that of stabilized zirconia, small additions of Co (1 mole%) increased the CTE to 10.1 ppm°C~(-1). The results of this study indicated that Cu acted as an acceptor when added to lanthanum chromite, increasing both the electrical conductivity and expansion upon reduction. The effect of vanadium additions were twofold. First, it acted as a donor in the chromite lattice effectively reducing the overall acceptor concentration. Secondly, during sintering, V reacted with Sr to form Sr_3(VO_4)_2, an effective sintering aid for lanthanum chromite, and further reduced the acceptor level by removing Sr from the perovskite lattice.
机译：优化锶取代的亚铬酸镧，以尽量减少膨胀的组合物中并不简单，必须小心地进行，以避免损害烧结性，导电性，和机械强度。在这项研究中，各种镧锶cnromites用V，铜，和Mg修饰以允许在空气中的致密化在1500℃下，它们的材料的性能进行了评价。两种添加剂（〜5摩尔％的V和2摩尔％的Cu）导致的锶取代的（10和15摩尔％）完全致密的铬酸镧。评价该组合物中，只有了La_（0.85）SR_（0.15）CR_（0.95）V_（0.05）O_3似乎是有希望的互连材料，显示出<10〜（-16）大气压0.1％的扩张。而热膨胀系数明显小于稳定的氧化锆，钴（1摩尔％）的少量添加增加了CTE 10.1 ppm的°C〜（-1）。这项研究的结果表明，铜充当当加入到铬酸镧的受体，通过还原提高导电性和膨胀二者。钒增加的影响是双重的。首先，它曾在此铬铁矿晶格有效地降低了整体的受体浓度的献血者。其次，在烧结过程中，V与锶反应形成Sr_3（VO_4）_2，对于亚铬酸镧的有效的烧结助剂，并通过从钙钛矿晶格锶进一步减小受主能级。

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