Calculated phase diagrams for activated low pressure diamond growth from C–H, C–O, and C–H–O systems

1997 ◽  
Vol 12 (12) ◽  
pp. 3250-3253 ◽  
Author(s):  
Ji-Tao Wang ◽  
Yong-Zhong Wan ◽  
David Wei Zhang ◽  
Zhi-Jie Liu ◽  
Zhong-Qiang Huang
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Phase Diagrams ◽  
Linear Combination ◽  
Three Dimensional ◽  
Low Pressure ◽  
Diamond Growth ◽  
Growth Region ◽  
Calculated Phase ◽  
O Phase

Three-dimensional temperature (T)–pressure (P)–composition (X) phase diagrams of binary carbon-hydrogen (C–H) and carbon-oxygen (C–O) systems for activated low pressure diamond growth have been calculated. Based on an approximation of linear combination between C–H and C–O systems, a projective ternary carbonhydrogen-oxygen (C–H–O) phase diagram has also been obtained. There is always a diamond growth region in each of these phase diagrams. Once a supply of external activating energy stops, the diamond growth region will not exist. Nearly all of the reliable experimental data reported in the literature drop into the possible diamond growth region of the calculated projective ternary C–H–O phase diagram under the conditions of 0.01–100 kPa and above 700 K.

scholarly journals Thermodynamics and phase diagram calculation of some sections in the Ag-Bi-Sn system

2007 ◽  
Vol 72 (8-9) ◽  
pp. 901-909 ◽  
Author(s):  
Dragana Zivkovic ◽  
Iwao Katayama ◽  
Dragan Manasijevic ◽  
Hiromi Yamashita ◽  
Nada Strbac
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Phase Diagrams ◽  
Enthalpy Of Formation ◽  
Thermodynamic Functions ◽  
Excess Energy ◽  
Phase Diagram Calculation ◽  
Calculated Phase ◽  
Activity Diagrams

The thermodynamic properties and characteristic phase diagrams of some sections in the Ag-Bi-Sn system were calculated. The thermodynamic functions, such as Gibbs excess energy, activity and enthalpy of formation, were calculated using the RKM model and compared with experimental data reported in the literature. Iso-activity diagrams for all three components at 900 K have been constructed. The calculated phase diagrams of the vertical sections Sn-AgBi, Ag-BiSn and Bi-AgSn, obtained using the ThermoCalc program, were compared and confirmed with the results of DTA measurements from the present work. .

scholarly journals Thermodynamic reassessment of the Mn-Ni-Si system

2015 ◽  
Vol 51 (2) ◽  
pp. 125-132 ◽  
Author(s):  
B. Hu ◽  
Y. Du ◽  
J.J. Yuan ◽  
Z.F. Liu ◽  
Q.P. Wang
Keyword(s):  
Experimental Data ◽  
Phase Diagram ◽  
Phase Diagrams ◽  
Thermodynamic Parameters ◽  
Ternary Phase ◽  
Sublattice Model ◽  
Diagram Approach ◽  
Measured Phase

Iased on the new experimental data available in the literature, the Mn-Ni-Si system has been reassessed using the CALPHAD (CALculation of PHAse Diagram) approach. Compared with the previous modeling, the ?8 and ?12 ternary phases were treated as the same phase according to the new experimental data. The Mn3Si phase was described with two sublattice model (Mn, Ni)3(Si)1. The reported new ternary phase ? was not considered in the present work. Comprehensive comparisons between the calculated and measured phase diagrams showed that a set of thermodynamic parameters of the Mn-Ni-Si system obtained in this work was more accurate than the previous one.

Blade–Row Interactions in a Low Pressure Turbine at Design and Strong Off-Design Operation

2014 ◽  
Vol 136 (11) ◽  
Author(s):  
Martin Lipfert ◽  
Jan Habermann ◽  
Martin G. Rose ◽  
Stephan Staudacher ◽  
Yavuz Guendogdu
Keyword(s):  
Experimental Data ◽  
Flow Field ◽  
Three Dimensional ◽  
Suction Side ◽  
Low Pressure ◽  
Test Facility ◽  
Time Resolved ◽  
Joint Project ◽  
Low Pressure Turbine ◽  
Blade Row

In a joint project between the Institute of Aircraft Propulsion Systems (ILA) and MTU Aero Engines, a two-stage low pressure turbine is tested at design and strong off-design conditions. The experimental data taken in the Altitude Test Facility (ATF) aims to study the effect of positive and negative incidence of the second stator vane. A detailed insight and understanding of the blade row interactions at these regimes is sought. Steady and time-resolved pressure measurements on the airfoil as well as inlet and outlet hot-film traverses at identical Reynolds number are performed for the midspan streamline. The results are compared with unsteady multistage computational fluid dynamics (CFD) predictions. Simulations agree well with the experimental data and allow detailed insights in the time-resolved flow-field. Airfoil pressure field responses are found to increase with positive incidence whereas at negative incidence the magnitude remains unchanged. Different pressure to suction side (SS) phasing is observed for the studied regimes. The assessment of unsteady blade forces reveals that changes in unsteady lift are minor compared to changes in axial force components. These increase with increasing positive incidence. The wake-interactions are predominating the blade responses in all regimes. For the positive incidence conditions, vane 1 passage vortex fluid is involved in the midspan passage interaction, leading to a more distorted three-dimensional (3D) flow field.

Upper Critical Field and Irreversibility Line in Bi2Sr2CuO6+δ/CaCuO2 Superconducting Superlattices Obtained by MBE

2000 ◽  
Vol 14 (25n27) ◽  
pp. 2767-2772
Author(s):  
Matteo Salvato ◽  
Carmine Attanasio ◽  
Gerardina Carbone ◽  
Rosalba Fittipaldi ◽  
Tiziana Di Luccio ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Experimental Data ◽  
Thin Films ◽  
Phase Diagrams ◽  
Applied Magnetic Field ◽  
Three Dimensional ◽  
Upper Critical Field ◽  
Resistivity Measurements ◽  
T Phase ◽  
The Magnetic Field

Resistivity measurements in external applied magnetic field up to 8.5T have been performed on Bi2Sr2CuO6+δ/CaCuO2 superconducting superlattices obtained by MBE. The magnetic field (H) vs. temperature (T) phase diagrams have been determined and the experimental data have been compared with that obtained in the case of Bi2Sr2CuO6+δ thin films deposited with the same technique. A reduction of the anisotropy has been obtained in the case of the superlattices with respect to the case of Bi2Sr2CuO6+δ thin films and a three dimensional behavior has been observed by paraconductivity measurements.

New-Type Co-Based Superalloys Designed by CALPHAD Method

2015 ◽  
Vol 816 ◽  
pp. 578-580 ◽  
Author(s):  
Shu Yu Yang ◽  
Min Jiang ◽  
Lei Wang
Keyword(s):  
Phase Diagram ◽  
Phase Equilibria ◽  
Phase Diagrams ◽  
Calculated Phase Diagram ◽  
Calphad Method ◽  
Two Phase ◽  
Calculated Phase ◽  
New Type

The phase equilibria of new-type Co-based superalloys which include the system of Co-Al-W were studied by CALPHAD method. It was shown that γ+γ' two-phase regions were existed in the calculated phase diagrams. The compositions of new-type Co-based superalloys which can obtain γ+γ' microstructures were predicted due to the calculated phase diagram. The mole fractions of the constituent phases of Co-Al-W-Ni-Cr alloys were calculated. The temperature of γ' phase began to precipitate at about 1050°C.

A projective ternary phase diagram of stationary non-equilibrium states for low-pressure diamond growth

1997 ◽  
Vol 42 (11) ◽  
pp. 967-968 ◽  
Author(s):  
Jitao Wang ◽  
Zhongqiang Huang ◽  
Yongzhong Wan ◽  
Wei Zhang ◽  
Qinghe Yang
Keyword(s):  
Phase Diagram ◽  
Ternary Phase ◽  
Ternary Phase Diagram ◽  
Low Pressure ◽  
Equilibrium States ◽  
Diamond Growth ◽  
Stationary Non Equilibrium States ◽  
Non Equilibrium

scholarly journals Phase relations in Bi-rich part of the Bi-Ga-Ni system

2012 ◽  
Vol 48 (3) ◽  
pp. 375-381 ◽  
Author(s):  
D. Zivkovic ◽  
D. Manasijevic ◽  
Lj. Balanovic ◽  
D. Minic ◽  
V. Cosovic ◽  
...  
Keyword(s):  
Experimental Data ◽  
Phase Diagrams ◽  
Reasonable Agreement ◽  
Calphad Method ◽  
Phase Relations ◽  
Calculated Phase ◽  
Bismuth Content

The results of phase relations investigation in bismuth-rich part of ternary Bi-Ga-Ni system are presented in this paper. Two sections with constant bismuth content equal to 80 and 90 at% were investigated experimentally using DSC and SEM-EDS methods and predicted thermodynamically by CALPHAD method. Calculated phase diagrams showed reasonable agreement with experimental data.

Experimental and Computational Investigation of the Time-Averaged and Time-Resolved Pressure Loading on a Vaneless Counter-Rotating Turbine

2000 ◽  
Author(s):  
C. W. Haldeman ◽  
M. G. Dunn ◽  
R. S. Abhari ◽  
P. D. Johnson ◽  
X. A. Montesdeoca
Keyword(s):  
Experimental Data ◽  
High Pressure ◽  
Pressure Ratio ◽  
Three Dimensional ◽  
Low Pressure ◽  
Navier Stokes ◽  
Experimental Program ◽  
Time Resolved ◽  
Design Point ◽  
High Pressure Ratio

The experimental program reported here was executed using full-scale vaneless counter-rotating engine hardware operating at nondimensionally scaled aerodynamic design point conditions. Measurements were obtained for three different pressure ratio values: design point, low pressure ratio, and high pressure ratio. For brevity, only the design point data will be presented in this paper. Time-averaged and time-resolved surface pressures on the high pressure turbine (HPT) vane, HPT blade, and low pressure turbine (LPT) blades are presented. Additionally, three-dimensional (3D) Navier-Stokes computational fluid dynamics (CFD) predictions are presented for comparison with experimental data. The results presented show that the predictions qualitatively capture the flowfield physics, but require some additional calibration to fully match experimental data quantitatively.

scholarly journals 3D computer model of the Ag-Cu-Ni T-x-y diagram: verification of sections in the atlas of phase diagrams for lead-free soldering

2021 ◽  
Vol 57 (1) ◽  
pp. 15-24
Author(s):  
M. D. Parfenova ◽  
V. P. Vorob'eva ◽  
V. I. Lutsyk
Keyword(s):  
Phase Diagram ◽  
Ternary System ◽  
Phase Diagrams ◽  
Computer Model ◽  
Binary Systems ◽  
Three Dimensional ◽  
Lead Free ◽  
Published Data ◽  
Isothermal Sections ◽  
3D Computer Model

Spatial (three-dimensional - 3D) computer model of the T-x-y diagram of the Ag - Cu - Ni system, which is promising for the development of environmentally friendly solders, is presented. The model is constructed on the basis of published data on the binary systems forming this ternary system, the concentration projection of the liquidus surfaces, and four isothermal sections. It is shown that the phase diagram (PD) consists of 14 surfaces and 9 phase regions. The adequacy of the model is confirmed by comparing the isothermal sections and the liquidus projection.

Phase Diagram of Mg-Zn-Gd System Alloy at Mg Rich Corner and its Application in the Development of Two New Alloys

2013 ◽  
Vol 765 ◽  
pp. 3-7 ◽  
Author(s):  
Yong Chun Guo ◽  
Jian Ping Li ◽  
Jin Shan Li ◽  
Zhong Yang ◽  
Ping Wang
Keyword(s):  
Phase Diagram ◽  
Phase Diagrams ◽  
Equilibrium Phase ◽  
Calculated Phase Diagram ◽  
Equilibrium Phase Diagram ◽  
Isothermal Sections ◽  
Calculated Phase ◽  
Treatment Processes ◽  
Zn Content ◽  
Calculation Software

The Mg-rich corner of the equilibrium phase diagram of the Mg-Zn-Gd system has been calculated in detail using the phase diagram calculation software PANDAT and the thermodynamic database for Mg alloys. The calculated phase diagram includes the liquidus projection, isothermal sections and vertical sections. It is found that an increase of Zn content in the Mg-Gd alloy reduces the phase field of α-Mg + GdMg5. Based on the calculated phase diagrams, two alloys, Mg-5.5Zn-2Gd-0.5Zr and Mg-1.6Gd-5.5Zn-0.5Zr (wt.%), denoted as ZGK620 and ZGK616, were developed and their solidification and precipitation processes were analyzed in detail. The optimized thermal mechanical processing and heat-treatment processes were defined by referring to the calculated phase diagrams of the Mg-Zn-Gd system.

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