摘要
在工业纯铁熔体中加入纳米Al2O3颗粒,熔炼后得到铸锭试样.用扫描电镜(SEM)及能谱(EDS)研究了铸锭金相试样中夹杂物的存在状态及成分.采用非水溶液电解法分离、收集铸锭中的非金属夹杂物,用SEM及EDS分析了夹杂物的形貌、大小和元素组成.结果表明,外加的纳米Al2O3颗粒能够在纯铁熔体中稳定存在,并与杂质元素所生成的夹杂物发生复合,复合夹杂物的尺寸为5～10μm.纳米Al2O3颗粒一般存在于复合夹杂物的内部.未发现纳米Al2O3团聚烧结成大于10μm颗粒的现象.从热力学和颗粒运动行为方面进一步分析了纳米Al2O3在纯铁熔体中的稳定性和团聚烧结成大颗粒的可能性.
An ingot specimen was obtained by the process of adding Al2O3 nano-particle to molten industrial pure iron. The existent state and chemical components of nonmetallic inclusions in the metal-phase sample were investigated by SEM and EDS. Nonmetallic inclusions were extracted from the ingot by the electrolytic method in nonaqueous solution, and SEM and EDS were used to study their characteristics, such as morphology, size, and chemical components. The results showed that additive Al2O3 nano-partlcle could be stabilized and combine with microelements, such as Mn and S to form complex inclusions, whose size is about 5 - 10 μm. Al2O3 nanoparticle existed usually in the interior of complex inclusions. The phenomena of reuniting and agglomeration of Al2O3 nano-particle was rare. The thermodynamic stability and probability of reuniting and agglomerating of Al2O3 nano-particle were also analyzed in molten pure iron.
出处
《北京科技大学学报》
EI
CAS
CSCD
北大核心
2007年第6期578-581,共4页
Journal of University of Science and Technology Beijing
关键词
炼钢
铁液
纳米Al2O3颗粒
夹杂物
电解
steelmaking
liquid iron
Al2O3 nano-particle
inclusions
electrolysis
