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用Fe-Cr-Al作为电热材料与Ni—Cr相比具有一系列的优点:使用温度高,电阻率大,在氧化气氛中使用寿命比Ni—Cr高,此外Fe—Cr—Al是铁基合金不加Ni,所以Fe—Cr—Al系是符合我国资源情况的电热合金,从而得到了大量的推广与使用。往0Cr25Al5合金中加入稀土金属对提高寿命的效果极为显著。当稀土含量为0.034～0.075％时,0Cr25Al5合金在1200℃的快速寿命由原来的180小时提高到300小时。稀土作用如此之大,再加上我国稀土资源丰富,因此进一步研究稀土在该合金中的应用,使其主要性能指标赶上或超过国际先进水平,就显得更为重要了。
Compared with Ni-Cr, Fe-Cr-Al has a series of advantages compared with Ni-Cr: the use temperature is high, the resistivity is large, the service life in the oxidizing atmosphere is higher than Ni-Cr, and the Fe-Cr- Alloy without Ni, Fe-Cr-Al system is in line with the situation of our country’s electric alloy, which has been a lot of promotion and use. To 0Cr25Al5 alloy rare earth metal to increase the life expectancy is extremely significant. When the content of rare earth is 0.034 ~ 0.075%, the rapid life of 0Cr25Al5 alloy at 1200 ℃ increased from 180 hours to 300 hours. The role of rare earth so large, coupled with our country rich in rare earth resources, so further study of rare earth alloy in the application of its main performance indicators to catch up with or exceed the international advanced level, it becomes even more important.