| Title |
Characteristics of LaCrO_3-Dispersed Cr Alloy for Metallic Interconnector of Solid Oxide Fuel Cell |
| Authors |
전광선(Jeon, Kwang-Sun) ; 송락현(Song, Rak-Hyun) ; 신동렬(Shin, Dong-Ryul) |
| Keywords |
LaCrO_3-Dispersed Cr Alloy ; Metallic Interconnector ; Solid Oxide Fuel Cell ; Conductivity ; Oxidation ; Thermal Expansion |
| Abstract |
LaCrO_3-dispersed Cr alloys for metallic interconnector of solid oxide fuel cell have been studied as function of LaCrO_3 content in the range of 5 to 25 vol.% in order to examine the electric conductivity, the oxidation property and the thermal expansion behavior of these alloys. The LaCrO_3-dispersed Cr alloys showed high electrical conductivities of 3~5×10^4 S/cm at room temperature, and as the LaCrO_3content increased the conductivity decreased slightly. During the cyclic oxidation test at 1100°C, the weight change of the Cr alloys decreased with increasing number of oxidation cycle except first cycle, which is attributed to the vaporization of the oxide scale. More addition of the LaCrO_3 content reduced also the weight change of the Cr alloys. These mean that the oxide scale formed at the surface of the Cr alloy becomes stable with increasing number of oxidation cycle andLaCrO_3 content. The measured thermal expansion of the Cr alloy was well fitted to that of 8 mol% Y_2O_3-stabilized ZrO_2 electrolyte. These results demonstrate that LaCrO_3-dispersed Cr alloy is a useful material for metallic interconnector of solid oxide fuel cell. |