Texture development in Ba2YCu3O7−x films from trifluoroacetate precursors

1990 ◽  
Vol 5 (12) ◽  
pp. 2771-2779 ◽  
Author(s):  
Paul C. McIntyre ◽  
Michael J. Cima ◽  
Man Fai Ng ◽  
Raymond C. Chiu ◽  
Wendell E. Rhine
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Partial Melting ◽  
Furnace Atmosphere ◽  
Texture Development ◽  
Microstructure Development

The effect of heat treatment on microstructure development in Ba2YCu3O7−x films prepared from metal trifluoroacetate precursors is investigated. The growth of textured Ba2YCu3O7−x on BaZrO3 substrates is shown to be strongly influenced by the furnace atmosphere used during calcination. Differential thermal analysis was used to show that conditions that promote c-axis texture are also those which cause partial melting of Ba–Y–Cu–O compositions that are depleted in barium relative to Ba2YCu3O7−x.

Preparation of Glass-Ceramics Using Molybdenum Tailings

2011 ◽  
Vol 284-286 ◽  
pp. 1431-1434 ◽  
Author(s):  
Jin Rui Zhang ◽  
Ru Wang
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Crystalline Phase ◽  
Glass Ceramics ◽  
Chemical Properties ◽  
The Other ◽  
Raw Material ◽  
Physical Chemical ◽  
Nucleation Agents

In order to utilization the molybdenum tailings which be deposited in large quantities. Test used it to prepare glass-ceramics as main raw material, TiO2 as nucleation agents and CaO-Al2O3-SiO2 system and wollastonite as the principal crystalline phase. Heat treatment system of glass-ceramics was based on the differential thermal analysis. The crystalline phase, microstructure and characteristics of glass-ceramics were analysis by XRD, SEM and physical, chemical properties test. The result shows that the performance of glass-ceramics was superior to the other types of building decoration stone.

A DTA Study on HVOF Thermally Sprayed WC–M Coatings

2007 ◽  
Vol 566 ◽  
pp. 155-160
Author(s):  
M. Heydarzadeh Sohi ◽  
Shahin Khameneh Asl ◽  
Kazuyuki Hokamoto ◽  
M. Rezvani
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
High Temperature ◽  
Amorphous Phase ◽  
Exothermic Reaction ◽  
Intermetallic Phase ◽  
Chemical Compositions ◽  
Crystalline Phases ◽  
Sprayed Coatings

Five types of tungsten carbide based powders with different chemical compositions (WC-12Co, WC-17Co, WC-10Ni, WC-10Co-4Cr and WC- 20Cr-7Ni) were deposited onto ST37 mild steel substrate using high velocity oxy fuel (HVOF) spray technique. The feedstock powders and sprayed coatings were studied by using X-ray diffraction (XRD), and differential thermal analyzing (DTA). The results were shown during HVOF thermal spraying, WC-M powders become partially melted before being sprayed on the surface of the substrate with supersonic speed. In these types of coatings, the crystallographic structures are normally non equilibrium, because the cooling rates of the deposited splats are very high due to the cold substrate acting as a thermal sink. These partially melted powders are then rapidly solidified to an amorphous phase. XRD analysis showed that the amorphous phase was existed in all of the as sprayed coatings. The amorphous phase in WC-12Co, WC-17Co and WC-10Ni coatings was transformed to crystalline phases by heat treatment at high temperature. Heat treatment of these coatings at high temperature also resulted in partially dissolution of WC particles and formation of new crystalline phases. In cobalt base coatings, the new phases were eta carbide phases like Co6W6C and Co3W3C but in WC-10Ni coating a NiW intermetallic phase was formed. Heat treatment of WC-10Co-4Cr and WC-20Cr-7Ni coatings did not change the amorphous phases in these coatings. Differential thermal analysis of cobalt containing coatings revealed an exothermic reaction at approximately 880°C. This exothermic reaction may be related to the transformation of the amorphous phase to eta phases. On the contrary, DTA analysis of feedstock powders of these coatings showed an endothermic reaction at approximately 1000°C. DTA analyses of nickel containing cermets also showed similar results. Differential thermal analysis of chromium containing cermets did not show any noticeable exothermic or endothermic reactions.

Sintered Hydroxyapatite / Bioactive Glass Composites: Thermal Analysis and Bioactivity

2006 ◽  
Vol 309-311 ◽  
pp. 167-170 ◽  
Author(s):  
Xanthippi Chatzistavrou ◽  
K. Chrissafis ◽  
Eleana Kontonasaki ◽  
T. Zorba ◽  
Petros Koidis ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Treatment Process ◽  
Biological Properties ◽  
Heat Treatment Process ◽  
Layer Formation ◽  
Glass Composites ◽  
Sintered Composite ◽  
Composite Pellets

Three-dimensionally ordered materials containing hydroxyapatite (HAp) as well as Bioglass® (BG) have been prepared in form of pellets and have been examined the effects of BG addition -in combination with a heat treatment process- on biological properties of composite HAp/BG. The investigation of the bioactive behavior of sintered and unheated biphasic mixtures and the deviations from pure HAp was performed by FTIR spectroscopy and Differential Thermal Analysis. It was observed the appearance of new phases on sintered composite pellets, while a faster biological HAp layer formation was detected, on the composite unheated pellets’ surface than on pure HAp and sintered composite pellets, currently leading to increased bioactivity.

Temperature effect on nonhydrolytic foaming process

1999 ◽  
Vol 14 (10) ◽  
pp. 4020-4024
Author(s):  
G. S. Grader ◽  
Y. de Hazan ◽  
G. Natali ◽  
T. Dadosh ◽  
G. E. Shter
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Weight Loss ◽  
Differential Thermal Analysis ◽  
Analysis Data ◽  
Effect Of Temperature ◽  
Isopropyl Ether ◽  
Foaming Process ◽  
Ether Complex

This paper describes the effect of temperature on the formation of nonhydrolytic alumina foams. The foams are generated by heat treatment of crystals of the aluminum chloride isopropyl ether complex [AlCl3(Pri2O)], with the release of isopropyl chloride (PriCl). The chlorine content in the foams was determined by titration, and their weight loss during sintering was measured by thermogravimetric and differential thermal analysis. Based on these measurements, the condensation degree (CD) in the foams was modeled. The foaming time ranged from several minutes at 70 °C to several seconds at 160 °C. It was found that the chlorine-to-aluminum ratio of the foam (Cl/Al) decreased from 1.79 at 70 °C to 1.56 at 160 °C. Thermogravimetric analysis data confirm that the smaller Cl content gives rise to a smaller weight loss during thermal decomposition, consistent with a higher CD in the foams created at higher temperatures. Finally, about 80% of the PriCl produced during complex decomposition and subsequent –Al–O–Al– condensation reactions is lost during foaming.

Effects of Heat-Treatment on the Magnetic Properties of Fe2O3-CaO-SiO2 Glass Ceramics

2010 ◽  
Vol 158 ◽  
pp. 52-55 ◽  
Author(s):  
Ye Han ◽  
Ming Gu ◽  
Wei Wei Zhang ◽  
Shu Yu Yao
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Magnetic Properties ◽  
Differential Thermal Analysis ◽  
Glass Ceramics ◽  
Vibrating Sample Magnetometer ◽  
Crystalline Phases ◽  
Sio2 Glass ◽  
X Ray ◽  
Saturation Magnetisation

The Fe2O3-CaO-SiO2 glass ceramics were prepared by the method of quenching and controlled crystallisation. Differential thermal analysis, X-ray diffractometry and vibrating sample magnetometer were used to study the crystallisation and magnetic properties of Fe2O3-CaO-SiO2 glass ceramics. It was concluded that the main crystalline phases of glass ceramics during the process were Hematite, Iron Silico Oxide and Hedenbergite. The saturation magnetisation values (Ms) of glass ceramics varied between 108 emu•g-1 and 147 emu•g-1. The crystallisation of Hedenbergite lead to the high Hc value (~2000Oe).

Study of Heat Treatment Parameters in Obtaining Glassceramic Materials with the Addition of Industrial Wastes

2014 ◽  
Vol 805 ◽  
pp. 598-603
Author(s):  
Cláudia Terezinha Kniess ◽  
G.J.M. Martins ◽  
P.B. Prates ◽  
Humberto Gracher Riella ◽  
Jonas V. Matsinhe ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Grain Size ◽  
Differential Thermal Analysis ◽  
Material Properties ◽  
Bottom Ash ◽  
Industrial Wastes ◽  
Residual Amorphous Phase ◽  
Kinetics Of ◽  
Crystallization Of Glass

The production of materials from crystallization of glass, called glassceramic, have proved interesting by the possibility of development of different microstructures, with reduced grain size and the presence of residual amorphous phase in different quantities. The method that uses the differential thermal analysis (DTA) provides research on the material properties over a wide temperature range, it ́s widely applied to crystallization processes of glassceramic materials. Within this context, this paper aims to study the kinetics of nucleation and crystal growth in glassceramic materials in the system SiO2-Al2O3-Li2O, obtained with the addition of mineral coal bottom ash as source of aluminosilicates, through the technique of differential thermal analysis.

scholarly journals Thermal and Photoluminescence Properties of Nd3+ Doped Tellurite Nanoglass

Nano Hybrids ◽  
2013 ◽  
Vol 3 ◽  
pp. 81-92 ◽  
Author(s):  
Nur Amanina Mat Jan ◽  
M.R. Sahar ◽  
Sib Krishna Ghoshal ◽  
R. Ariffin ◽  
M.S. Rohani ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Fluorescence Spectra ◽  
Photoluminescence Properties ◽  
X Ray Diffraction ◽  
Melt Quenching ◽  
X Ray ◽  
Emission Transition ◽  
Crystallisation Temperature

Series of glasses based on (75-x)TeO2-15MgO-10Na2O-xNd2O3, where x=0, 1.0, 2.0 and 3.0, are synthesized by conventional melt-quenching technique. The nanoglass particles are derived from heat treatment of this glass near crystallisation temperature for 3 hours. The existence of nanocrystalline nature of this glass is confirmed by x-ray diffraction (XRD) technique followed by calculation using Scherrer equation. Meanwhile, the crystallization temperature, Tc determined using Differential thermal analysis (DTA). The fluorescence spectra of Nd3+ions exhibit emission transition of2P3/24I9/2,4G7/24I9/2,2H11/24I9/2, and4F9/24I9/2under 765 nm excitation wavelengths.

scholarly journals The thermophysical properties of primary phase in lithium germanium phosphate glass

2021 ◽  
Vol 53 (3) ◽  
pp. 301-310
Author(s):  
Srdjan Matijasevic ◽  
Vladimir Topalovic ◽  
Snezana Grujic ◽  
Veljko Savic ◽  
Jelena Nikolic ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Differential Thermal Analysis ◽  
Phosphate Glass ◽  
Primary Phase ◽  
Melt Quenching ◽  
Scanning Calorimetry ◽  
Characteristic Temperatures ◽  
Xrd Method

The selected lithium germanium-phosphate glass was prepared by a conventional melt-quenching technique. The XRD method was employed to confirm the glass was obtained and to reveal crystalline phases during heat treatment. The dilatometry (DIL), differential thermal analysis (DTA), and differential scanning calorimetry (DSC) were used to determine the characteristic temperatures and enthalpies of crystallization and melting of the crystalline phase. The DTA and DIL were used to obtain the viscosity curves by applying the Vogel-Fulcher-Tammann (VFT) equation

scholarly journals Determination of Phase Transitions in Gutta-Percha by Differential Thermal Analysis

1977 ◽  
Vol 56 (12) ◽  
pp. 1453-1462 ◽  
Author(s):  
Hillar M. Rootare ◽  
John M. Powers
Keyword(s):  
Heat Treatment ◽  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Treatment Temperature ◽  
High Melting ◽  
Gutta Percha ◽  
Thermal Analyzer ◽  
Heat Treated ◽  
High Melting Form

Pure gutta-percha was heat-treated in a differential thermal analyzer. The high melting form crystallized on cooling when gutta-percha was heated to 70 C or less. Above 74 C, crystallization into the low melting form predominated. Either polymorph can be selectively crystallized by control of the heat-treatment temperature before cooling.

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