硼铁矿冶炼Fe－Si－B合金的工艺研究

建立了以辽东硼铁矿为原料，用碳热还原成碳－铝热还原冶炼Ｆｅ－Ｓｉ－Ｂ合金的工艺，测定了还原时间和温度对合金中Ｂ，Ｓｉ，Ｃ含量的影响以及Ｃ含量与Ｂ和Ｂｉ含量的关系：用熔渣－金属平衡方法对合金进行脱Ａｌ，研究了碱度以及Ｂ２Ｏ３和ＳｉＯ２含量对合金中Ａｌ含量的影响．结果表明，该工艺可使合金中Ｃ含量降至０．１５％，Ａｌ含量小于０．０５％．     

微量碳对淬态Fe－Si－B非晶丝表面层结构及脆性的影响

用旋转水中熔融金属纺丝法制备了Ｆｅ－Ｓｉ－Ｂ非晶金属丝。拉伸和弯折性能表明，当合金中杂质碳原子分数含量≥０．２％时，制备态（淬态）非晶丝发生脆化。电子探针、Ａｕｇｅｒ能谱分析与透射电镜观察发现，非晶丝表面具有大约１５０－３００ｎｍ宽的富碳层且包含Ｆｅ＿（２３）（Ｃ，Ｂ）＿６相。该相是Ｆｅ－Ｓｉ－Ｂ非晶丝脆化的原因。     

Fe-Si-B非晶带材高温氧化行为及回收工艺

??In order to reduce the oxidative burning loss of Fe78Si9B13 amorphous ribbon in the recovery process?? the oxidation behavior of Fe78Si9B13 amorphous ribbon was studied. The results show that the oxidation of Fe78Si9B13 amorphous ribbon at high temperature is related to the heating rate. The oxidation weight gain of Fe78Si9B13 amorphous ribbon at 5 and 10K/min from room temperature to 1223K are 44% and 31% respectively. There is an oxide layer with loose texture and a small amount of microcrack at the interface between the sample and atmosphere by SEM. The oxide layer contains a large amount of Fe2O3 and a little SiO2 by XRD. Oxidation kinetics curve shows that the oxidation weight gain of the samples follows a linear rule within 5hours at 1073 and 1173K?? then a parabolic rule. At 1273K?? however?? it only follows a linear rule?? meanwhile the oxidation speed is very fast?? with the oxidation weight gain reaches 40% in 12min. The oxidation weight gain in the amorphous ribbon recycling process can be reduced through cutting down the furnace gas temperature?? compressing the waste ribbon and unqualified products in the packaging process and blowing argon to reduce the partial pressure of oxygen in the furnace. Thus the slag decreases to 9-10g when 1kg waste ribbon is recovered?? and the Si content of liquid alloy increases to 8. 9%.     

Crystallization of Fe78Si6B13 Bulk Crystaline/Amorphous （c/a） Composite

A metallic crystalline/amorphous （c/a） bulk composite was prepared by the slow cooling method after remelting the amorphous Fe78Si9B13 ribbon. By X-ray diffraction （XRD）, differential scanning calorimetry （DSC） and scanning electron microscope （SEM）, the composite consists of the primary dendrite α-Ee （without Si） as well as the amorphous matrix. After being anneal at 800 K, the uniform spheroid particles are formed in the c/a composite, which does not form in the amorphous ribbon under the various annealing process. Energy dispersive analysis of X-rays （EDAX）, SEM and XRD were applied to give more detailed information. The formation and evolution of the particle may stimulate the possible application of the Fe-matrix amorphous alloy.     

铁基非晶合金铁硅硼中硅和硼的测定

以相似材质硼铁和硅钢的化学分析方法为基础,建立了氟硅酸钾沉淀滴定法测定铁基非晶合金铁硅硼中硅、酸溶中和滴定法测定铁基非晶合金铁硼硅中硼的方法。硼的测定在酸溶样方法方面进行了改进,即酸不溶的白色絮状物经过滤分离用碱溶液溶解后,与滤液进行合并。硅的测定也将文献方法进行了一些改进,如减少了氢氟酸的用量并直接加入硝酸钾固体促进氟硅酸钾沉淀完全。本方法与传统方法硅和硼的检测结果相符,且重复性较好。     

Crystallization of Fe78Si9B13 Bulk Crystaline/Amorphous (c/a) Composite

A metallic crystalline/amorphous (c/a) bulk composite was prepared by the slow cooling method after remelting the amorphous Fe78Si9B13 ribbon. By X-ray diffraction (XRD),differential scanning calorimetry (DSC) and scanning electron microscope (SEM), the composite consists of the primary dendrite a-Fe (without Si) as well as the amorphous matrix. After being anneal at 800 K, the uniform spheroid particles are formed in the c/a composite, which does not form in the amorphous ribbon under the various annealing process. Energy dispersive analysis of X-rays (EDAX), SEM and XRD were applied to give more detailed information. The formation and evolution of the particle may stimulate the possible application of the Fe-matrix amorphous alloy.     

EFFECT OF Cr,Cu AND Co ON MAGNETOSTRICTION OF Fe-Si-B AMORPHOUS ALLOYS

The dependence of composition varied,especially C,Si,Cr,Cu and Co in four amorphousalloy systems Fe_(80-x)Cr_xSi_5B_(15).Fe_(80-x)Cr_xC_5B_(15).Fe_(80-x)Cu_xSi_5B_(15)and(Fe_(1-x)Co_x)_(82)Cu_(0.4)Si_(4.4)B_(13.2)upon their saturation magnetostriction at room temperature hasbeen studied.It was observed that the saturation magnetostriction of the alloys may be re-markably improved by small addition of Cu and Co.the peak value being up to 70×10~(-6)asx=0.02 in alloys(Fe_(1-x)Co_x)_(82)Cu_(0.4)Si_(4.4)B_(13.2).     

Fe-Si-B非晶条带加热时的晶化过程及对性能的影响

通过使用差热分析（DSC）,X衍射仪（XRD）,物性测量仪（PPMS）和透射电镜（SEM）等设备对进口商用Fe-Si-B非晶条带的结构及性能进行了详细检测和分析。条带晶化过程中没有明显的玻璃转变吸热过程,且会发生二次晶化。随着晶化程度的增加,晶化衍射斑会越来越明显,磁性能基本无变化,但是韧性降低,脆性增加。     

硼铁矿冶炼Fe—Si—B合金的工艺研究

建立了以辽东硼铁矿为原料，用碳热还原或碳－铝热还原冶炼Ｆｅ－Ｓｉ－Ｂ合金的工艺，测定了还时间和温度对合金中Ｂ，Ｓｉ，Ｃ含量的影响以及Ｃ含量与Ｂ和Ｓｉ含量的关系；用熔渣－金属平衡方法对合金进行脱Ａｌ，研究了碱度以及Ｂ２Ｏ３和ＳｉＯ２含量对合金中Ａｌ含量的影响。     

Thermo-Calc calculations and studies of the heating process of Fe83Si4B13 alloy

The microstructural changes of Fe_(83)Si_4B_(13) amorphous mother alloy during the heating process were investigated by Laser Scanning Confocal Microscopy( LSCM),and the phase transformation was determined by the Thermo-Calc calculations. The differences in the melting points measured by Differential Scanning Calorimetry( DSC)and LSCM,and those obtained by Thermo-Calc calculations were also discussed. It is found that the melting points measured by DSC and LSCM are relatively similar,whereas the onset and end of the melting temperatures calculated by Thermo-Calc software are higher than those measured by DSC and observed by LSCM.