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All available thermodynamic and phase diagram data have been critically assessed for all phases in the MnO-TiO2, MgO-TiO2, FeO-TiO2, Ti2O3-TiO2, Na2O-TiO2, and K2O-TiO2 systems at 1 bar pressure from 298 K to above the liquidus temperatures. All reliable thermodynamic and phase diagram data
have been simultaneously optimized to obtain, for each system, one set of model equations for the Gibbs energy of the liquid
slag as a function of composition and temperature and equations for the Gibbs energies of all compounds as functions of temperature.
The modified quasichemical model was used for the molten slag phases. 相似文献
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Nitrogen solubility in molten CaO-SiO2, CaO-MgO-SiO2, and BaO-MgO-SiO2 silicate systems was measured as functions of nitrogen and oxygen partial pressures and composition at 1823 K. Experimental
findings indicate that nitrogen exists as a free nitride ion or is associated with silicate networks, depending principally
on the slag composition. A special analytical technique was developed to separately determine the two species. Its dissolution
mechanism, which is similar to that for hydrogen, was proposed, being supported by the detection of a Si-N bond by infrared
spectroscopy. Neither the content of free nor incorporated nitrogen was demonstrated to have a very good correlation with
the CaO or SiO2 activity in the melts, probably because the activity coefficient of nitrogen is affected by the slag composition.
Formerly Graduate Student, Department of Metallurgy, The University of Tokyo. 相似文献
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Phosphorus partition ratios between CaO-Al2O3 and CaO-Al2O3-CaF2 fluxes and Fe-Csat-P alloys have been measured as a function of slag composition at 1500 °C. The effects of additions of BaO, Li2O, and Na2O to the CaO-Al2O3-CaF2 system on the phosphorus partition ratios at 1400 °C and 1300 °C have been measured. From the partition ratio, and assuming
that the oxygen potential is controlled by C-CO equilibrium, the phosphate capacities of the fluxes were calculated. Also,
the activities of Li2O and Na2O were measured as a function of slag composition at 1300 °C by equilibrating the flux and the metal with Pb-Li or Pb-Na alloy
and CO in a graphite crucible. The results indicate that phosphorus partition ratios with carbon-saturated iron and the phosphate
capacities for additions of more basic oxides decrease in the following order: Na2Oτ;Li2Oτ;BaO. The activities of Li2O and Na2O in calcium aluminate fluxes have large negative deviations from ideal behavior; the activity coefficients at infinite dilution
are on the order of 0.05 and 10-5, respectively.
Formerly Graduate Student, Department of Metallurgical Engineering and Materials Science, Carnegie Mellon University 相似文献
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采用碳酸钠和硼酸混合熔剂,用碱融法处理试样,并通过实验条件的优化,克服了引入大量基体对测定的干扰,实现了ICP-AES法对铁矿石、烧结矿中SiO2,CaO,MgO,Al2O3,MnO,P,TiO2等成分的同时测定.本方法试剂用量少,分析速度快,线性范围宽,分析结果准确、可靠. 相似文献
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Potentiostatic polarization measurements were carried out to investigate the mechanism of the charge transfer process on solid
platinum-molten PbO-GeO2, PbO-SiO2, and Na2O-SiO2 interfaces over a temperature range of 900° to 1135°C in an atmosphere of air and argon-oxygen gas mixtures. 相似文献
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采用电感耦合等离子体发射光谱法对铁矿石中SiO2 ,CaO ,MgO ,Al2 O3,MnO ,TiO2 的分析进行了试验研究。试液中10mg/mLFe存在时 ,基体效应明显 ,采用基体匹配办法消除铁的干扰。Ca ,Mg ,Al,Si,Ti,Mn ,Ni,Cr ,Cu ,Co ,Zn ,V ,Ba之间没有干扰 ;稀土元素对SiO2 的测定有干扰。Al,Ca ,Mg ,Mn ,Si,Ti的检出限分别为 0.5 ,0.12 5 ,0.0 5 ,0.0 5 ,0.2 5 ,0.0 0 2 5 μg/mL ,回收 相似文献
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Evgueni Jak Peter C. Hayes Sergei Degterov Arthur D. Pelton Ping Wu 《Metallurgical and Materials Transactions B》1997,28(6):1011-1018
Liquidus-phase equilibrium data of the present authors for the PbO-ZnO-SiO2 system, combined with phase equilibrium and thermodynamic data from the literature, were optimized to obtain a self-consistent
set of parameters of thermodynamic models for all phases. The modified quasichemical model was used for the liquid slag phase.
From these model parameters, the optimized ternary-phase diagram was back-calculated. 相似文献