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氧化膜特性、高温强度和非金属夹杂物是影响电热合金寿命的三个主要因素。近年来由于稀土添加剂的使用,使这些因素获得不同程度的改善,因而使铁铬铝电热合金使用寿命成倍增长。但合金中的稀土元素都是通过直接加入该金属而得到。这种把稀土金属在冶金过程中首先加入三相有衬电渣炉、感应炉或非真空电弧炉再进行单相电渣重熔的双联冶炼工艺,其稀土回收率为7～15％,而且使合金中稀土化合物类型的非金属夹杂物增加,降低了合金的使用寿命。本试验的目的之一是在电渣重熔OCr 25A15电热合金过程中,寻求一种添加稀
Oxide film characteristics, high temperature strength and non-metallic inclusions are the three main factors that affect the life of the electrothermal alloy. In recent years due to the use of rare earth additives, so that these factors have been improved to varying degrees, so that the life of iron-chromium aluminum electric doubled. However, rare earth elements in the alloy are obtained by adding the metal directly. This rare earth metal in the metallurgical process first joined the three-phase lined lining electroslag furnace, induction furnace or non-vacuum electric arc furnace and then single-phase ESR double smelting process, the rare earth recovery rate of 7 to 15% But also to increase the type of non-metallic inclusions of rare earth compounds in the alloy, reducing the service life of the alloy. One of the purposes of this test is to find an additive thinner in the ESR OCr 25A15 electric heating alloy process