公开(公告)号：US20090317705A1

公开(公告)日：2009-12-24

申请号：US12143188

申请日：2008-06-20

申请人： Matthew Joseph Alinger ,  Frederic Joseph Klug ,  James Anthony Ruud ,  Stephane Renou ,  Reza Sarrafi-Nour

发明人： Matthew Joseph Alinger ,  Frederic Joseph Klug ,  James Anthony Ruud ,  Stephane Renou ,  Reza Sarrafi-Nour

IPC分类号： H01M2/20 ,  H01M2/00 ,  H01M4/50 ,  H01M4/52 ,  H01M4/38 ,  H01M8/10

CPC分类号： H01M8/021 ,  H01M8/0228 ,  H01M2008/1293

摘要： A method for the formation of a diffusion barrier layer on a surface of at least one fuel cell interconnect structure is described. The interconnect structure is usually formed from ferritic stainless steel, and includes chromium. The method includes the step of coating an austenite phase-stabilizer on the interconnect surface, and then heating the coated surface. The heat treatment transforms the microstructure of the surface region of the interconnect, from a substantially ferritic body-centered cubic (BCC) phase to a substantially austenitic face-centered cubic (FCC) phase. The diffusion rate of chromium through the FCC phase is relatively low. Thus, the formation of a thick layer of chromium oxide can be minimized, leading to better fuel cell performance. Related fuel cells and fuel cell stacks are also disclosed.

摘要翻译： 描述了在至少一个燃料电池互连结构的表面上形成扩散阻挡层的方法。 互连结构通常由铁素体不锈钢形成，并且包括铬。 该方法包括在互连表面上涂覆奥氏体相稳定剂，然后加热涂覆表面的步骤。 热处理将互连表面区域的微观结构从基本上是铁素体体心立方（BCC）相变换为基本上奥氏体的面心立方（FCC）相。 铬通过FCC相的扩散速率相对较低。 因此，可以最小化形成厚的氧化铬层，从而导致更好的燃料电池性能。 还公开了相关的燃料电池和燃料电池堆。