Fe—Bi—j三元溶液体系热力学参数的测定与模型计算

利用气液平衡实验方法和三元系液态合金元组间相互作用系数的计算模型，测定和计算了Ｆｅ－Ｂｉ－ｊ三元溶液体系在１８７３Ｋ时第三组合组元Ｃｒ，Ｃｕ，Ｃ，Ａｌ和Ｓｉ对Ｂｉ的活度相互作用系数以及ｌｎγ＾０值。实验值与模型计算值符合良好。     

Fe液中Bi蒸气溶解平衡及第三组元的影响

用密封反应室气液平衡法,测定了Bi蒸气在Fe液中的溶解平衡及第三组元Cr,Cu,C,Al和Si对Bi溶解量的影响,得到Fe液中Bi蒸气溶解反应标准溶解吉布氏自由能与温度的关系式,以及1873K温度下Fe液中第三组元与Bi的活度相互作用系数.     

Fe—Ga—C三元系熔体热力学初探

通过计算和实验测定，求得了为进行提镓热力学分析计算所必要的势力学参数△Ｇ＾ｏＧａ→［Ｇａ］％，ｅ＾ＧａＧａ和ｅ＾ＣＧａ。     

Mn—Fe—C,Mn—Si—C体系热力学性质的研究

本文采用溶解平衡的方法测定了碳在不同含量的Mn-Fe,Mn-Si合金中及不同温度下的溶解度,用同一活度法推算出1400℃及1500℃时的e_C~(Si),e_C~(Fe)值,用Wagner方程推算出了1400℃与1500℃时的lnγ_C~°,ε_C~C,△_C~°值。     

铁液中Al－N，Nb－N平衡的研究

采用取样法，在密封体系的ＭｇＯ坩埚中研究了铁液中Ａｌ－Ｎ，Ｎｂ－Ｎ反应平衡。得到氮在铁液中的溶解平衡常数ｌｇＫ＝－１１０６／Ｔ－０．７７１ｌｇＫ＿（ＡＩＮ）＝－９９０９／Ｔ＋３．８１ｌｇＫ＿（ＮｂＮ）＝－３４７００／Ｔ＋１８．３７     

含锌溶液中阴离子对除铁过程影响的热力学规律

本文通过对主体阴离子分别为OH~-、SO_4~-和Cl~-的含锌溶液针铁矿除铁过程的热力学进行计算和分析,详细探讨了不同阴离子对针铁矿沉淀规律的影响。所得结果指出,溶液中引入离子SO_4~(2-)和Cl~-均能增大针铁矿的溶解度;而在相同条件下相同铁含量的锌硫酸盐或锌氯化物溶液中,要获得相同的除铁效果,氯化物体系针铁矿除铁过程更易实现。     

复杂硫酸盐溶液体系水解制取钛白的热力学研究

本文对复杂硫酸盐溶液体系水解制取钛白的工艺过程进行了热力学估算，对生产过程的进行可提供热力学依据并可判断水解过程中各反应发生的可能性，为工业生产工艺条件的控制提供参考。     

螯合树脂Monophos去除硫酸钴溶液中痕量铁的热力学分析

研究不同吸附条件下新型螯合树脂Monophos对硫酸钴溶液中痕量铁的吸附效果,从热力学角度分析了树脂的吸附机理。结果表明,Monophos吸附除铁后,初始料液中痕量铁的浓度分别从1.1~2.1mg/L降至0.4~0.9mg/L,铁脱除率可达57%~63%。Monophos对料液中铁的吸附为自发的物理吸附,更符合Langmiur等温吸附模型,随着吸附温度的升高,Monophos对料液中杂质铁的吸附更充分。     

Mn液中Ca溶解量及第3组元的影响

用密封容器气液平衡法,测定了Ca在Mn液中的饱和溶解量及第3组元C、Si、Ni、Al、Cr和As对其的影响.得到Mn液中Ca饱和溶解量与温度的关系式,以及1673K下Mn液中第3组元与钙的活度相互作用系数.     

铁液洁净度对凝固热力学参数的影响

为了给高洁净钢连铸细晶技术提供相关理论依据，在高温钼丝炉中通过对电解纯铁加金属铝和硅脱氧，获得不同铁液洁净度的试样。利用差热分析法测定了试样在相同冷却速度下的过冷度。利用凝固过程热力学理论研究了铁液洁净度与过冷度、凝固热力学驱动力、形核功和临界晶核半径等的关系。结果表明：随着铁液洁净度的提高，铁液凝固时的过冷度增大，形核所需的凝固热力学驱动力变大，非均质形核功和临界晶核半径减小。     

液态合金组元间相互作用系数模型

利用自由体积理论,Miedema半经验二元合金生成热模型和Toop几何模型建立了三元系液态合金组元间相互作用系数的计算模型,除N、H等气体元素外,计算结果与实验值符合良好。     

Relationship between Thermodynamic Parameters for Mn-Fe Melt and Temperature

The carbon solubility in Mn Fe melts were measured at 1 350℃ , 1 375℃, 1 425℃and 1 450℃, and accordingly the calculated equations were obtained. By thermodynamic derivation and calculation, some relationships between thermodynamic parameters for Mn-Fe melt and temperature were obtained.     

Calculation Model of Mass Action Concentration for Mg-Al, Sr-Al and Ba-Al Melts and Determination of Their Thermodynamic Parameters

Basedonthermodynamicpropertiesofdifferentkindsofmetallicmelts[1 5] ,ageneralunderstandingofcoexistencetheoryforstructureofmetallicmeltscanbeachieved .ThispaperaimsatdeterminationofthermodynamicparametersofMg Al,Sr AlandBa Almetallicmeltsbycalculationwithmassactionconcentrationsmodel.Therearesomeresearchworksaboutthephasediagramofthesebinarysys tems[6 ,7] ,dataofactivityinthesemelts[8 13 ] aswellasthethermodynamicparametersofSr AlandBa Almelts[12 ,13 ] .Thesedataareusedtobuildcalculationmod…     

Dissolution Equilibrium of Calcium Vapor in Liquid Iron

ＤｉｓｓｏｌｕｔｉｏｎＥｑｕｉｌｉｂｒｉｕｍｏｆＣａｌｃｉｕｍＶａｐｏｒｉｎ　ＬｉｑｕｉｄＩｒｏｎＳｏｎｇＢｏ；ＨａｎＱｉｙｏｎｇ；ＺｈａｎｇＸｉａｏｄｏｎｇＡｂｓｔｒａｃｔ：Ｔｈｅｄｉｓｓｏｌｕｔｉｏｎｅｑｕｉｌｉｂｒｉｕｍｏｆｃａｌｃｉｕｍｖａｐ...     

Solution and Thermodynamic Studies on Binary and Ternary Complexes of Lanthanides

The interactions of La(Ⅲ), Pr(Ⅲ), Nd(Ⅲ), Sm(Ⅲ), Eu(Ⅲ), Gd(Ⅲ), Dy(Ⅲ), and Yb(Ⅲ) with cytosine, 5-bromocytosine, 5-azacytosine and 5-flurocytosine as primary ligands (L) and guanine (A) as secondary ligand for both binary (1:1) as well as ternary (1:1:1) systems were investigated by potentiometric equilibrium measurements at 25, 35 and 45 ℃ in aqueous solution (ionic strength, μ=0.1 mol·dm-3 NaNO3). The stability constants of the binary (1:1) and ternary (1:1:1) metal-ligand complexes follow the following order La＜Pr＜Nd＜Sm＜Eu＞Gd＜Dy＞Yb. Results also indicate that the ternary lanthanide complexes of La(Ⅲ), Pr(Ⅲ), Nd(Ⅲ), Sm(Ⅲ), Eu(Ⅲ), Gd(Ⅲ), Dy(Ⅲ), and Yb(Ⅲ) are more stable than corresponding binary lanthanide complexes. The enthalpy (Δhof) and entropy (Δsof) changes for the formation of binary and ternary complexes were calculated from temperature coefficient data. The ΔΔSof values are positive for all the metal ligand systems. The negative ΔΔHof values indicate the extra stability of the ternary complexes by the exothermic enthalpy changes (ΔΔSof=ΔTSof-ΔBSof and ΔΔHof=ΔTHof-ΔBHof where ΔTSof, ΔTHof and ΔBSof, ΔBHof are the entropy and enthalpy values associated with the ternary and binary complexes, respectively). It was also proposed that the guanine is bonded to metal ions through N1/C6=O and N7 whereas cytosine and its derivatives are bonded through N3 atoms in ternary complexes.     

Prediction of Activities in Fe-Based Ternary Liquid Alloys by Hoch-Arpshofen Model

 Thermodynamic properties for an alloy system play an important role in the materials science and engineering. Therefore, theoretical calculations having the flexibility to deal with complexity are very useful and have scientific meaning. The Hoch-Arpshofen model was deduced from physical principles and is applicable to binary, ternary and larger system using its binary interaction parameters only. Calculations of the activities of Fe-based liquid alloys are calculated using Hoch-Arpshofen model from data on the binary subsystems. Results for the activities for Fe-Au-Ni, Fe-Cr-Ni, Fe-Co-Cr and Fe-Co-Ni systems at required temperature are presented by Hoch-Arpshofen model. The average relative errors of prediction are 78%, 45%, 49% and 27%, respectively. It shows that the calculated results are in good agreement with the experimental data except Fe-Au-Ni system, which exhibits strong interaction between unlike atoms. The model provides a simple, reliable and general method for calculating the activities for Fe-based liquid alloys.     

铝合金可锻性及热力学参数确定原则分析

对铝及铝合金可锻性进行了全面的分析,并在此基础上对铝及铝合金的热力学参数-锻造温度、锻造速度、变形程度等的确定原则进行了分析,例举了国内外常用铝合金的锻造工艺参数,可供生产实践中应用。