摘要
本文试验研制了四种Fe-Cr合金材料,其在900℃时的热膨胀率在10-11×10^-3范围内,其中Fe-Cr-4合金的热膨胀率为10.27×10^-3,与钇稳定氧化锆(YSZ)相比,热膨胀率逐渐接近;与传统合金材料相比,热膨胀率之差均有了明显下降,因而降低了界面热应力,有效改善层间的热失配现象.随着温度的升高,各合金试样的电阻率呈平缓增大的趋势.在850℃时,四种合金试样的电阻率在0.95-1.17×10^-3Ω·cm范围内,其中Fe-Cr-4试样的电阻率较低,为1.17×10^-3Ω·cm,满足用作SOFC连接体材料导电性能的要求.Fe-Cr-1、4两种合金试样的抗氧化性能较好,随着氧化时间的延长,试样表面形成稳定的3Cr2O3Fe2O3氧化层,氧化增重逐渐趋于稳定.累计氧化455 h后,Fe-Cr-1、4两种试样对应的氧化增重在0.0002 g/g左右;而Fe-Cr-2、3两种试样仍在0.0004 g/g以上.
Four kinds of Fe - Cr ferric alloys were manufactured in this experiment. Their thermal expansion rates at 900℃ were between 10 - 11 × 10^-3 ( and the rate of sample Fe - Cr -4 was 10. 27 × 10^-3 ), which were close to yttrium stabled zirconium (YSZ). Compared with traditional alloy materials, the thermal expansion rate margins were decreasing obviously, resulting in the decrease of thermal stress and the improvement of thermal matching. The electrical resistance of the samples increased smoothly with the increase of temperature. The electrical resistance of these four samples was in the range of 0. 95 - 1.17 × 10^-3Ω·cm, and sample Fe - Cr -4 was 1.17× 10^-3Ω·cm. Sample Fe -Cr- 1 and Fe -Cr-4 showed better performance on oxidation resistance, for a 3Cr203Fe2O3oxidation coating was formed on the sample surface and the mass gain tended to be stable with the oxidation operation prolonged. After 455 oxidation hours added up, the mass gain of sample Fe - Cr - 1 and Fe- Cr-4 was approximately 0. 0002g/g, yet sample Fe- Cr-2 and Fe- Cr-3 above 0. 0004g/g.
出处
《材料科学与工艺》
EI
CAS
CSCD
北大核心
2007年第4期534-536,共3页
Materials Science and Technology
基金
教育部重点项目(6087)
国家高技术发展计划资助项目(2006AA11A189)
关键词
膨胀率
高温电阻率
抗氧化性能
固体氧化物燃料电池
thermal expansion rate
electrical resistance at high temperature
oxidation resistance
Solid ox- ide fuel cell