Evaluation of Long-term Stability of Aluminized Stainless Steel Used in MCFCs I. Effect of Heat-treatment on Characteristics of Aluminized Coating Layer

To estim菰e a監o馳g-t㎝〔鱒ion behavior ofこhe aluminized stainless st㏄1(310S)used in a wet-seal area in MCFCs，the e鰍of h㎝一t胤meo亡oon面ons on cha倣edstics of the coating lay鉱was lnvestiga【ed，The gτowing ra亡e of innerAI di価sed layerin酬with the亡empemture． However，chalacterisdcs of the dif血sedlayeτ 鵬aled atmore than1α73K d撫d丘om山at鵬atedup to lO23K。Thesurface AI concent【a巨on wasdeα硲ed丘o皿 32％to21％in2000h heat・αeatmeotat1023K Compa㎡ng the diff回sion c㏄fficientofAI at923K with k at1023K， it was fbund that the chamcterisdcsofthe aluminizedcoating layefconductedheat-tτeatment fbr2000h at1023Kwas app憩Dximatelyequivalentto監hat usedinthewet-sealaleafo【40000hat923K．Fromtheresult，it scemedtobeable toβva夏uaに山e lo臆9-term stabili呼of the alu∬亘駐ized stainless steel by sho虞eτpedod tests． 1緒言 溶融炭酸塩型燃料電池(MCFC)においてはエッジ部 における反応ガスの外部リークを防ぐためウエットシ ール構造が採用されている．ウエットシール部では材料 表面が多量の炭酸塩に覆われるため，ステンレス鋼等を