摘要:
研究了无取向硅钢钙处理前后夹杂物的行为,重点考察了钙处理前后夹杂物的成分、类型、形貌和尺寸研究的变化情况,为实际生产中无取向硅钢的钙处理提供理论指导。试验发现:钙处理前夹杂物主要以Al2O3、Al2O3-MgO为主,且在夹杂物表面有AlN析出,钙处理后夹杂物以Al2O3-MgO-CaS-CaO系复合夹杂物为主,还含有少量的SiO2或AlN;钙处理前后,夹杂物形貌由多边形或不规则形逐渐向球形或近似球形转变,并且夹杂物尺寸不断增大;钙处理前后,含钙夹杂物的比例发生突变,由10%增大到74.5%,且随着钙处理时间的延长,含钙夹杂物比例下降,表明钙处理使夹杂物变性后易聚集长大并上浮去除。
Abstract:
Behavior of inclusions before and after calcium treatment in non-oriented silicon steel was researched by investigating changes of compositions,types,shapes and sizes of inclusions before and after calcium treatment,for the purpose of providing theoretical guidance for calcium treatment of non-oriented silicon steel in actual situation.Results indicated that Al2O3 and Al2O3-MgO were main types of inclusions before calcium treatment,sometimes AlN maybe precipitate in the outer of inclusions.Al2O3-MgOCaS-CaO system inclusions with a small amount of SiO2 or AlN were dominant after calcium treatment.The shapes of inclusions changed from polygon or irregular before calcium treatment into spherical or near spherical,furthermore,the sizes of inclusions constantly increased.Furthermore,ratio of inclusions including calcium sharply increased from 10 percent before calcium treatment to 74.5 percent after calcium treatment.Meanwhile,the ratio of inclusions including calcium decreased when calcium treatment time extended,which suggested that calcium treatment was beneficial to aggregation,grow-up,floating and removal of inclusions.
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