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由电机或变压器制造厂进行脱碳热处理时常常导致溶质元素的内氧化,这种内氧化层(由Si—Al氧化物构成)的存在,对磁性有害,导磁率恶化程度与内氧化层的厚度成正比。尽管理论上认为可设计出一种退火工艺,使其达到完全脱碳而又不产生内氧化,但实际上这种退火受到时间和成本的限制。解决内氧化问题的另一种途径是研究添加某种合金元素,使其阻止氧向钢中扩散。已经明确,向含Si—Al的电工钢中添加0.08％(重量百分比)的锑,不仅可发展有利织构,而且还可抑制内氧化、改善磁性。含锑的1％硅钢,经1小时脱碳退火后形成的内氧化层厚度仅为不含锑的1/3,导磁率提高200μ。
The decarburization heat treatment by a motor or transformer manufacturer often results in internal oxidation of the solute element. The presence of such an inner oxide layer (composed of Si-Al oxide) is detrimental to magnetism, and the degree of permeability deterioration and the thickness of the inner oxide layer Is proportional. Although it is theoretically believed that an annealing process can be designed to achieve complete decarburization without internal oxidation, the annealing is virtually time and cost constrained. Another way to deal with the problem of internal oxidation is to study the addition of some alloying element that prevents it from diffusing into the steel. It has been made clear that addition of 0.08% by weight of antimony to Si-Al-containing electrical steel not only develops a favorable texture but also suppresses internal oxidation and improves magnetic properties. Antimony-containing 1% silicon steel, after 1 hour of decarburization annealing formed within the oxide thickness of only antimony-free 1/3, the permeability increased 200μ.