Thermodynamic Assessment of the System CaO-P2O5: Application of the Ionic Two-Sublattice Model to Glass-Forming Melts

2011 ◽  
Vol 94 (9) ◽  
pp. 3094-3103 ◽  
Author(s):  
Sara Serena ◽  
Leticia Carbajal ◽  
Ma Antonia Sainz ◽  
Angel Caballero
Keyword(s):  
Thermodynamic Assessment ◽  
Sublattice Model ◽  
Glass Forming

Thermodynamic assessment and glass forming ability prediction of the Zr-Fe-Cu system

Calphad ◽  
2019 ◽  
Vol 64 ◽  
pp. 175-184 ◽  
Author(s):  
Nan Zou ◽  
Hai-Jin Lu ◽  
Pei-Wen Gu ◽  
Jia-Yun Wang ◽  
Xuan-Kai Feng ◽  
...  
Keyword(s):  
Thermodynamic Assessment ◽  
Glass Forming Ability ◽  
Glass Forming

Thermodynamic assessment of Hafnium Iridium binary system

2018 ◽  
Vol 115 (5) ◽  
pp. 503 ◽  
Author(s):  
Mohamed Idbenali ◽  
Colette Servant ◽  
M’barek Feddaoui
Keyword(s):  
Phase Diagram ◽  
Solid Solution ◽  
Thermodynamic Assessment ◽  
Phase Diagram Data ◽  
High Temperature Phase ◽  
Temperature Phase ◽  
Calphad Approach ◽  
Stoichiometric Compound ◽  
Sublattice Model ◽  
Good Agreement

The Hf–Ir system has been thermodynamically modeled by the CALPHAD approach. Hf2Ir, αHfIr, βHfIr, γHfIr (high temperature phase) and HfIr3 which have a homogeneity range, were treated as the formula (Hf,Ir)x:(Ir,Hf)1−x by a two-sublattice model with a mutual substitution of Hf and Ir in both sublattices.Hf5Ir3 has been treated as a stoichiometric compound while a solution model has been used for the description of the FCC (Ir) solid solution. Additionally, two different models describing the excess Gibbs energy for the liquid and for the solid solutions (BCC, FCC and HCP) were used and their predictions are compared. The calculations based on the thermodynamic modeling are in good agreement with the phase diagram data and experimental thermodynamic values available in the literature.

Thermodynamic assessment of the Al–Ni–Gd glass-forming system

2003 ◽  
Vol 353 (1-2) ◽  
pp. 114-123 ◽  
Author(s):  
M.C. Gao ◽  
R.E. Hackenberg ◽  
G.J. Shiflet
Keyword(s):  
Thermodynamic Assessment ◽  
Glass Forming

Thermodynamic Assessment of the Al—Ni—Gd Glass-Forming System.

ChemInform ◽  
2003 ◽  
Vol 34 (22) ◽  
Author(s):  
M. C. Gao ◽  
R. E. Hackenberg ◽  
G. J. Shiflet
Keyword(s):  
Thermodynamic Assessment ◽  
Glass Forming

Thermodynamic assessment of the MgO–Al2O3–SiO2 system

2005 ◽  
Vol 20 (4) ◽  
pp. 975-986 ◽  
Author(s):  
Huahai Mao ◽  
Olga Fabrichnaya ◽  
Malin Selleby ◽  
Bo Sundman
Keyword(s):  
Experimental Data ◽  
New Species ◽  
Liquid Phase ◽  
Thermodynamic Assessment ◽  
Liquidus Surface ◽  
Sublattice Model ◽  
Ternary Compounds ◽  
Self Consistent ◽  
A New Species ◽  
Consistent Thermodynamic Data

Thermodynamic properties of the phases in the MgO–Al2O3–SiO2 system were assessed, resulting in a set of self-consistent thermodynamic data. The two ternary compounds, cordierite and sapphirine, were optimized from subsolidus reactions. The liquid phase was described by the ionic two-sublattice model with a new species AlO2−1, yielding the formula (Al+3,Mg+2)P(AlO2−1,O−2,SiO4−4,SiO20)Q. Projection of the liquidus surface was calculated. Various isothermal and isoplethal sections were compared with the experimental data.

A Thermodynamic Description of the Al-Ir System

2007 ◽  
Vol 539-543 ◽  
pp. 2389-2394 ◽  
Author(s):  
Taichi Abe ◽  
Machiko Ode ◽  
Hideyuki Murakami ◽  
Chang Seok Oh ◽  
Cenk Kocer ◽  
...  
Keyword(s):  
Experimental Data ◽  
Binary System ◽  
Thermodynamic Assessment ◽  
Thermodynamic Description ◽  
Calculated Data ◽  
Intermetallic Phases ◽  
Sublattice Model ◽  
Calphad Technique ◽  
Formation Enthalpies ◽  
B2 Phase

The thermodynamic assessment of the Al-Ir binary system, one of the key sub-systems of the Ir-based alloys, was performed using the CALPHAD technique. The AlIr(B2) phase was described using the two sublattice model with the formula (Al,Ir)0.5(Ir,Va)0.5, while other intermetallic phases were treated as stoichiometric compounds. The calculated data of the phases in the Al-Ir system can be used to accurately reproduce experimental data, such as phase equilibria, invariant reactions, and formation enthalpies of the intermetallic phases.

Electron Microscopy of Silicon Nitride-Based Ceramics

1991 ◽  
Vol 49 ◽  
pp. 926-927
Author(s):  
Gareth Thomas
Keyword(s):  
Electron Microscopy ◽  
High Temperature ◽  
Silicon Nitride ◽  
World Wide ◽  
Sintering Temperature ◽  
Liquid Phase Sintering ◽  
High Temperature Strength ◽  
Sintering Additives ◽  
Glass Forming ◽  
Dense Product

Silicon nitride and silicon nitride based-ceramics are now well known for their potential as hightemperature structural materials, e.g. in engines. However, as is the case for many ceramics, in order to produce a dense product, sintering additives are utilized which allow liquid-phase sintering to occur; but upon cooling from the sintering temperature residual intergranular phases are formed which can be deleterious to high-temperature strength and oxidation resistance, especially if these phases are nonviscous glasses. Many oxide sintering additives have been utilized in processing attempts world-wide to produce dense creep resistant components using Si3N4 but the problem of controlling intergranular phases requires an understanding of the glass forming and subsequent glass-crystalline transformations that can occur at the grain boundaries.

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