Kinetics of the Crystallization Process of the Amorphous Metal Powder Alloy Co84Fe5Si8.5B2.5

1988 ◽  
Vol 79 (1) ◽  
pp. 20-23
Author(s):  
Milenko V. Susic ◽  
Yurii M. Litvinenko
Keyword(s):  
Metal Powder ◽  
Crystallization Process ◽  
Amorphous Metal ◽  
Powder Alloy ◽  
Kinetics Of

scholarly journals Non-Isothermal Crystallization Kinetics of Poly(Ethylene Glycol)–Poly(l-Lactide) Diblock Copolymer and Poly(Ethylene Glycol) Homopolymer via Fast-Scan Chip-Calorimeter

Polymers ◽  
2021 ◽  
Vol 13 (7) ◽  
pp. 1156
Author(s):  
Dejia Chen ◽  
Lisha Lei ◽  
Meishuai Zou ◽  
Xiaodong Li
Keyword(s):  
Ethylene Glycol ◽  
Heterogeneous Nucleation ◽  
Isothermal Crystallization ◽  
Crystallization Process ◽  
Poly Ethylene Glycol ◽  
Ozawa Method ◽  
Isothermal Crystallization Kinetics ◽  
Fast Cooling ◽  
Poly Ethylene ◽  
Kinetics Of

The non-isothermal crystallization kinetics of double-crystallizable poly(ethylene glycol)–poly(l-lactide) diblock copolymer (PEG-PLLA) and poly(ethylene glycol) homopolymer (PEG) were studied using the fast cooling rate provided by a Fast-Scan Chip-Calorimeter (FSC). The experimental data were analyzed by the Ozawa method and the Kissinger equation. Additionally, the total crystallization rate was represented by crystallization half time t1/2. The Ozawa method is a perfect success because secondary crystallization is inhibited by using fast cooling rate. The first crystallized PLLA block provides nucleation sites for the crystallization of PEG block and thus promotes the crystallization of the PEG block, which can be regarded as heterogeneous nucleation to a certain extent, while the method of the PEG block and PLLA block crystallized together corresponds to a one-dimensional growth, which reflects that there is a certain separation between the crystallization regions of the PLLA block and PEG block. Although crystallization of the PLLA block provides heterogeneous nucleation conditions for PEG block to a certain extent, it does not shorten the time of the whole crystallization process because of the complexity of the whole crystallization process including nucleation and growth.

Kinetics of Barium Sulfate Deposition and Crystallization Process in the Flowing Tube

2020 ◽  
Vol 59 (16) ◽  
pp. 7299-7309
Author(s):  
Alex Yi-Tsung Lu ◽  
Khadouja Harouaka ◽  
Samridhdi Paudyal ◽  
Saebom Ko ◽  
Chong Dai ◽  
...  
Keyword(s):  
Barium Sulfate ◽  
Crystallization Process ◽  
Sulfate Deposition ◽  
Kinetics Of

Crystallization Behavior and Growing Process of Rutile Crystals in Ti-Bearing Blast Furnace Slag

2016 ◽  
Vol 35 (8) ◽  
pp. 787-797
Author(s):  
Wu Zhang ◽  
Li Zhang ◽  
Yuhai Li ◽  
Xin Li
Keyword(s):  
Blast Furnace ◽  
Blast Furnace Slag ◽  
Crystallization Process ◽  
Elevated Temperatures ◽  
Avrami Equation ◽  
X Ray Diffraction ◽  
Experimental Parameters ◽  
Kinetics Of ◽  
Crystal Seed ◽  
Furnace Slag

AbstractThe aim of the present work is to elucidate crystallization and growing process of rutile crystals in Ti-bearing blast furnace slag. The samples were taken from the liquid slag and quenched at once at elevated temperatures in order to analyze phase transaction of titanium and grain size of rutile crystals. Crystallization and growing kinetics of rutile crystals under elevated temperature conditions were calculated, and the crystallization process of rutile crystals under isothermal conditions was expressed by Avrami equation. The effects of experimental parameters, such as experimental temperatures, SiO2 addition, cooling rate, crystal seed addition and oxygen flow, were investigated by X-ray diffraction (XRD) and scanning electron microscopy (SEM), the optimal conditions for rutile crystals to grow up were obtained. Distribution and movement state of rutile crystals in the slag were analyzed.

Kinetic analysis of solid-state processes

2001 ◽  
Vol 16 (6) ◽  
pp. 1862-1871 ◽  
Author(s):  
Jiří Málek ◽  
Takefumi Mitsuhashi ◽  
José Manuel Criado
Keyword(s):  
Solid State ◽  
Kinetic Analysis ◽  
Crystallization Process ◽  
Good Description ◽  
Simple Method ◽  
Solid State Kinetics ◽  
Kinetics Of ◽  
Nonisothermal Conditions ◽  
Two Parameter

A simple method for kinetic analysis of solid-state processes has been developed. A criteria capable of classifying different processes is explored here with a view toward visualizing the complexity of solid-state kinetics. They provide a useful tool for the determination of the most suitable kinetic model. The method has been applied to the analysis of crystallization processes in amorphous ZrO2 and RuO2. It is found that the crystallization kinetics of as-prepared sample exhibits a complex behavior under nonisothermal conditions. This is probably due to an overlapping of the nucleation- and crystal-growth processes at the beginning of crystallization. As a consequence, the Johnson–Mehl–Avrami nucleation-growth model cannot be applied. A two-parameter autocatalytic model provides a good description of the crystallization process under isothermal and nonisothermal conditions.

Kinetics of non-isothermal crystallization process in various sized Li2B4O7 glasses

2004 ◽  
Vol 131 (2) ◽  
pp. 129-133 ◽  
Author(s):  
S.J. Kim ◽  
J.E. Kim ◽  
Y.H. Rim ◽  
Y.S. Yang
Keyword(s):  
Isothermal Crystallization ◽  
Crystallization Process ◽  
Kinetics Of

The role of mass transfer in the kinetics of the electrodeposition of metal powder at gas-evolving electrodes

1981 ◽  
Vol 14 (2) ◽  
pp. 109-117 ◽  
Author(s):  
G.H. Sedahmed ◽  
Y.A. El-Taweel ◽  
O.A. Hassan
Keyword(s):  
Mass Transfer ◽  
Metal Powder ◽  
Kinetics Of

Study in Kinetics of Barium Sulfate Crystallization Process of Oilfield Injection

2014 ◽  
Vol 962-965 ◽  
pp. 757-761
Author(s):  
Bei Yang ◽  
Xiang Zhang ◽  
Xin Ge Shi ◽  
Jia Neng Guo ◽  
Qi Wei Wang ◽  
...  
Keyword(s):  
Sodium Sulfate ◽  
Barium Sulfate ◽  
Crystallization Process ◽  
Conductivity Measurement ◽  
Barium Chloride ◽  
Sulfate Solution ◽  
Conductivity Equation ◽  
Measuring Device ◽  
Conductivity Curve ◽  
Kinetics Of

With conductivity measurement in different concentrations of barium chloride, sodium sulfate, sodium chloride solution, their concentration-conductivity equation is obtained. Through mathematical conversion, the relation between sulfuric acid root ion in the solution, barium ion conductivity and the concentration is showed as: X=4.1744×10-6Y-6.8544×10-5,which is used to reflect the undissolved salt barium sulfate crystallization in the solution. Conductivity online measuring device is established, which can Intermittently test barium chloride, sodium sulfate solution of different concentrations, and detect the change of electrical conductivity in the process of crystallization of homogeneous barium sulfate in real-time. the different stages of crystallization process is determined by analysis of the conductivity curve. Through data processing to concert concentration into conductivity, so that the kinetic equation of barium sulfate crystallization process are obtained.

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