Thermodynamic description of the Ti–O system using the associate model for the liquid phase

Cancarevic, Marija; Zinkevich, M.; Aldinger, Fritz

doi:10.1016/j.calphad.2007.01.009

Cited by 75 publications

(33 citation statements)

References 48 publications

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“…All the higher oxides of titanium, Ti 2 O 3 , Ti 3 O 5 , Magneli phases (Ti n O 2n-1 , 28 ≥ n ≥ 4) (Jacob et al 2000) and TiO 2-x figure 1(a) is reasonably consistent with the phase diagrams for the binary system given in the compilation by Massalski et al (1986) and those suggested by Cancarevic et al (2007) and Okamoto (2001). Figure 1(a) provides the first available complete experimentally determined isothermal section of the system Ca-Ti-O.…”

Section: Resultssupporting

confidence: 82%

“…Accurate data on Gibbs free energies of formation of calcium titanates (CaTiO 3 , Ca 4 Ti 3 O 10 , and Ca 3 Ti 2 O 7 ) have been measured recently (Jacob and Abraham 2009). Considerable thermodynamic data on phases present along the Ti-O binary are available in the literature (Kubaschewski 1983;Chase Jr 1998;Jacob et al 2000;Cancarevic et al 2007). Although some of the data are not of high accuracy, it can nevertheless be used for the first iteration in a Gibbs energy minimization code.…”

Section: Resultsmentioning

confidence: 99%

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Phase diagram of the system Ca-Ti-O at 1200 K

Jacob

Gupta

2009

Bull Mater Sci

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Phase relations in the system Ca-Ti-O have been established by equilibration of several samples at 1200 K for prolonged periods and identification of phases in quenched samples by optical and scanning electron microscopy, XRD and EDS. Samples representing 20 compositions in the ternary system were analyzed. There was negligible solid solubility of Ca in the phases along the binary Ti-O, and of Ti in CaO. Four ternary oxides were identified: CaTiO 3 , Ca 4 Ti 3 O 10 and Ca 3 Ti 2 O 7 containing tetravalent titanium, and CaTi 2 O 4 containing trivalent titanium. Tie-lines link calcium titanite (CaTi 2 O 4 ) with the three calcium titanates (CaTiO 3 , Ca 4 Ti 3 O 10 and Ca 3 Ti 2 O 7 ), CaO, oxygen excess TiO 1+δ and stoichiometric TiO. Tie-lines connect CaTiO 3 with TiO 2-x , Magneli phases Ti n O 2n-1 (28 ≥ n ≥ 4), Ti 3 O 5 , Ti 2 O 3 and TiO 1+δ . CaO was found to coexist with TiO, and Ti-O solid solutions α and β. The phase diagram is useful for understanding the mechanisms and kinetics of direct calciothermic reduction of TiO 2 to metal and electrochemical reduction of TiO 2 using graphite anode and molten CaCl 2 electrolyte.

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Section: Resultssupporting

confidence: 82%

Section: Resultsmentioning

confidence: 99%

Phase diagram of the system Ca-Ti-O at 1200 K

Jacob

Gupta

2009

Bull Mater Sci

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“…Этой функциональной группе соответствуют пики при ν = 400, 658 и 862 см -1 [24,25]. Наличие данных пиков в ИК-спектрах МО-смесей указывает на растворение кислорода в решетке титана (максимальная рас-творимость кислорода в титане -32 ат.% [26]). Максимальная относительная интенсивность этих пиков отмечена на ИК-спектре образца, по-лученного после МО в течение 10 мин, что свиде-тельствует о более полном взаимодействии титана с кислородом.…”

Section: результаты и их обсуждениеunclassified

Peculiarities of formation of sintered electrodes of the Ti–Ti3P–CaO composition and their application in technology of pulsed electric-discharge machining of titanium

Логинов¹,

Левашов²,

Потанин³

et al. 2015

Izv. VUZ. Poroshk. Met.

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Исследовано влияние механической обработки на структуру и фазовый состав порошковых смесей Ti-10%Ca 3 (PO 4 ) 2 . По тех-нологии прессования и вакуумного спекания получены керамические электродные материалы Ti-Ti 3 P-CaO с высокой одно-родностью компонентов и остаточной пористостью 5-7 %. Изучена эрозионная способность спеченного металлокерами-ческого электрода Ti-Ti 3 P-CaO при импульсной электроискровой обработке титановых подложек и проведено сравнение с электродами TiC 0,5 -Ti 3 PO x -CaO, изготовленными методом самораспространяющегося высокотемпературного синтеза. По-крытия, полученные при использовании электродов Ti-Ti 3 P-CaO и TiC 0,5 -Ti 3 PO x -CaO, характеризовались высокой сплошнос-тью, толщиной до 20 мкм, микротвердостью до 3,6 ГПа, шероховатостью 3,3-4,6 мкм, наличием и равномерным распределе-нием биоактивных элементов кальция и фосфора. 2015. No. 4. С. 45-58. DOI: dx.doi.org/10.17073/1997-308X-2015 Peculiarities of formation of sintered electrodes of the Ti-Ti 3 P-CaO composition and their application in technology of pulsed electric-discharge machining of titaniumThe influence of mechanical treatment on the structure and phase composition of Ti-10%Ca 3 (PO 4 ) 2 powder mixtures is investigated. The Ti-Ti 3 P-CaO ceramic electrode materials with a high uniformity of components and residual porosity of 5-7% are fabricated according to the pressing and vacuum sintering technology. The erosion ability of the Ti-Ti 3 P-CaO metal-ceramic electrode under the pulsed electric-discharge machining of titanium substrates is investigated and compared with the TiC 0,5 -Ti 3 PO x -CaO electrodes fabricated by self-propagating high-temperature synthesis. Coatings fabricated when using Ti-Ti 3 P-CaO and TiC 0,5 -Ti 3 PO x -CaO electrodes are characterized by high continuity, thickness up to 20 μm, microhardness up to 3,6 GPa, roughness to 3,3-4,6 μm, and the presence and uniform distribution of calcium and phosphorus bioactive elements.Keywords: pulsed electric-discharge machining, planetary ball mill, sintering, bioactive coating, ceramics.

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“…These parameters [12][13][14][15] used in the present work are summarized in Table I. The liquid phase is described by the substitutional solution model due to no observation of ordering or immiscibility.…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

Thermodynamic Modeling of the ZrO2-YO1.5-TiO2 System

Wang

Dong

et al. 2010

Metall Mater Trans A

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The binary systems ZrO 2 -YO 1.5 , ZrO 2 -TiO 2 , and YO 1.5 -TiO 2 are reassessed, and a set of self-consistent thermodynamic parameters, which can be reliably extrapolated into the ZrO 2 -YO 1.5 -TiO 2 ternary system, are obtained. The substitutional solution model and the stoichiometric compound model are applied to the phase description in the ternary system, and the thermodynamic database of this ternary system is derived by the CALPHAD approach. It is noted that, except for the liquid phase, no ternary interaction parameters are introduced. The present evaluation can better describe the experimental phase diagrams reported recently at 1573 K, 1773 K, and 1873 K (1300°C, 1500°C, and 1600°C). Thus, the optimized thermodynamic parameters may be authentic and can be applied to optimizing the compositions of the novel materials based on this ternary system.

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Thermodynamic description of the Ti–O system using the associate model for the liquid phase

Cited by 75 publications

References 48 publications

Phase diagram of the system Ca-Ti-O at 1200 K

Phase diagram of the system Ca-Ti-O at 1200 K

Peculiarities of formation of sintered electrodes of the Ti–Ti3P–CaO composition and their application in technology of pulsed electric-discharge machining of titanium

Thermodynamic Modeling of the ZrO2-YO1.5-TiO2 System

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