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以 Fe-Cr-Al 为基的合金已广泛地被用作电热材料,它具有使用温度高、电阻温度系数小、表面负荷大、比重小、价格便宜等优点。在 Fe-Cr-Al 合金中加入微量的稀土元素使合金寿命大大提高,它在电热合金生产中已普遍使用。关于稀土元素及钇对电热合金和耐热合金的氧化行为之影响已有大量的研究。一般认为,稀土元素的作用是在于改善氧化皮在基体金属上的粘着性,并且在某些情况下降低氧化速度。在电热合金反复加热——冷却工
Fe-Cr-Al based alloy has been widely used as electric material, which has the advantages of high temperature, low temperature coefficient of resistance, surface load, the proportion of small, cheap and so on. In the Fe-Cr-Al alloy by adding a trace amount of rare earth elements greatly enhance the life of the alloy, which has been widely used in the production of electric alloys. There have been a lot of studies on the influence of rare earth elements and yttrium on the oxidation behavior of electric and heat-resistant alloys. It is generally believed that the role of rare earth elements is to improve the adhesion of the scale to the base metal and, in some cases, to reduce the rate of oxidation. Repeated heating in electric heating - cooling