Influence of heat-treatment schedule on crystallization and microstructure of bauxite tailing glass–ceramics coated on tiles

2008 ◽  
Vol 197 (1-3) ◽  
pp. 206-211 ◽  
Author(s):  
Huizhi Yang ◽  
Changping Chen ◽  
Hongwei Sun ◽  
Hongxia Lu ◽  
Xing Hu
Keyword(s):  
Heat Treatment ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Heat Treatment Schedule ◽  
Bauxite Tailing

Formation and Passive Q-Switch Performance of Glass-Ceramics Containing Co2+-Doped Spinel Nanocrystals

2008 ◽  
Vol 39-40 ◽  
pp. 219-224 ◽  
Author(s):  
Olga Dymshits ◽  
Alexander Shashkin ◽  
Alexander A. Zhilin ◽  
Yury Volk ◽  
Alexander Malyarevich ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Cross Sections ◽  
Near Infrared ◽  
Glass Ceramics ◽  
Excited State Absorption ◽  
Output Pulse ◽  
Treatment Schedule ◽  
Transparent Glass ◽  
Treatment Conditions ◽  
Heat Treatment Schedule

Compositions and heat treatment conditions were determined at which absorption and luminescence properties of aluminosilicate transparent glass-ceramics are defined mainly by tetrahedrally coordinated Co2+ ions located in spinel nanocrystals. Optical properties of cobaltdoped aluminosilicate transparent glass-ceramics have been studied in visible – near infrared (IR) spectral range. It was demonstrated that the concentration of tetrahedrally coordinated Co2+ ions in the spinel nanocrystals is determined by the CoO content in the initial glass and is independent of the heat-treatment schedule. Absorption saturation and bleaching relaxation under excitation of the 4A2→4T1(4F) transition of tetrahedrally coordinated Co2+ ions were studied. The value of groundstate and excited state absorption cross-sections of tetrahedrally coordinated Co2+ ions was estimated. Comparative study of output pulse parameters of Q-switched Er:glass laser using cobaltdoped glass-ceramics and Co2+:MgAl2O4 single crystal is presented.

Phase Evolutionary Process of CaO-Al2O3-SiO2 System Glass and Glass-Ceramic

2010 ◽  
Vol 168-170 ◽  
pp. 1947-1952
Author(s):  
Feng He ◽  
Cai Ming Ping ◽  
Jin Shu Cheng
Keyword(s):  
Heat Treatment ◽  
Glass Ceramic ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Evolutionary Process ◽  
Treatment Schedule ◽  
Nucleation Agent ◽  
Transmission Electron ◽  
New Type ◽  
Heat Treatment Schedule

Sintering glass-ceramics, a new type material for architectural decoration, belong to CaO-Al2O3-SiO2system (CAS) without nucleation agent. Combined by Differential thermal analysis (DTA), X-ray diffraction (XRD), Scanning electron microscopy (SEM) and Transmission electron microscope (TEM), phase evolutionary process of CaO-Al2O3-SiO2system glass and glass-ceramic was investigated. According the relation between heat treatment schedule and microstructure, the glass system has a very wide temperature range of crystallization. The crystalline phase is β-CaSiO3(β-wollastonite) and there is no other crystalline phases precipitated in these glass-ceramics. The influences of various heat treatment systems on the structure and properties of the glass-ceramics were investigated simultaneously. The optimal heat treatment schedule, microstructure and bending strength of the CAS glass ceramic were gained.

An MgB2 Superconducting Joint with its Own Heat-Treatment Schedule

2021 ◽  
pp. 1-1
Author(s):  
Hiromi Tanaka ◽  
Yi Li ◽  
Yoonhyuck Choi ◽  
Dongkeun Park ◽  
Wooseung Lee ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Treatment Schedule ◽  
Heat Treatment Schedule

Preparation and Characterization of Sm3+ Doped CBS Transparent Glass-Ceramics

2011 ◽  
Vol 418-420 ◽  
pp. 796-799
Author(s):  
Yi Min Wang ◽  
Hong Bo Zhang ◽  
Chun Hui Su ◽  
Dong Dong Fan
Keyword(s):  
Room Temperature ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Laser Material ◽  
Transparent Glass ◽  
Melting Method ◽  
Strong Luminescence ◽  
Heat Treatment Schedule ◽  
Precursor Glass

Sm3+ doped transparent glass-ceramics of CaO-B2O3-SiO2 (CBS) system were prepared and characterized.The precursor glass was prepared by melting method and annealed at 450°C for 2h and cooled to room temperature at a speed of 5°C/min.The appropriate heat treatment schedule to precursor glass was determined to be 2h at 600°C for nucleation and 3h at 810°C for crystallizition.The transmittion of glass-ceramics at the range of visable light is 68% in average. Five main emission bands of Sm3+ are centered around 564nm,605nm,646nm,679nm and 789nm,which correspond to the 4G 5/2→6H 5/2,4G 5/2→6H 7/2,4G 5/2→6H 9/2,4G 5/2→6H 11/2 and 4G 5/2→6H 13/2 transitions.Very strong luminescence at around 599nm is observed in glass-ceramics,This indicates glass-ceramics to be a better host for Sm3+ than precursor glass and a hopeful laser material.

Nucleation and Crystallization of Glass-Ceramics from Coal Fly Ash

2007 ◽  
Vol 280-283 ◽  
pp. 1651-1654 ◽  
Author(s):  
Fei Peng ◽  
Kai Ming Liang ◽  
Hua Shao ◽  
An Min Hu ◽  
Feng Zhou
Keyword(s):  
Activation Energy ◽  
Fly Ash ◽  
Coal Fly Ash ◽  
Glass Ceramics ◽  
Treatment Schedule ◽  
Nucleation Agent ◽  
Optimum Heat ◽  
Heat Treatment Schedule ◽  
Kinetics Of ◽  
Optimum Heat Treatment

The nucleation and crystallization kinetics of glass obtained by melting coal fly ash with additives at 1550°C have been investigated. The optimum heat treatment schedule for the glass was nucleation at 825°C for 60min before crystallization at 962°C for 4h. The activation energy for crystallization of the glass-ceramics, obtained by the DDTA result, was 280.03 kJ/mol, lower than that of glass-ceramics obtained from pure reagents. The low activation energy is caused by impurities in fly ash, serving as nucleation agent. The results of XRD and SEM show that glass-ceramics developed nano-sized spherical wollastonite.

Li2O-Al2O3-SiO2 Glass-Ceramics Used As Anodic Bonding Materials

2008 ◽  
Vol 368-372 ◽  
pp. 1436-1438 ◽  
Author(s):  
Hong Li ◽  
Yun Du ◽  
Jin Shu Cheng ◽  
Tian He Wang
Keyword(s):  
Heat Treatment ◽  
Thermal Expansion ◽  
Coefficient Of Thermal Expansion ◽  
Glass Ceramics ◽  
Treatment Method ◽  
Substrate Material ◽  
Anodic Bonding ◽  
Treatment Schedule ◽  
Crystal Phases ◽  
Step Heat Treatment

The glass-ceramics, whose coefficient of thermal expansion approximately matched to that of silicon, were studied to replace conventional heat-resistant glass as substrate material for anodic bonding. The basic glasses of the Li2O-Al2O3-SiO2 system with TiO2 and ZrO2 as nucleation agents were prepared by melting technology, and the temperatures of nucleation and crystallization were determined. The glass-ceramics were obtained by two-step heat-treatment method. The oriented crystallization of glasses in gradient temperature field was studied. The crystal phases and microstructures of glass- ceramics were analyzed. Effect of heat-treatment schedule on the coefficient of thermal expansion was discussed. The results showed that the most of the main crystal phases of the samples were β-spodumene. The coefficient of thermal expansion of sample was about 32.5×10-7/°C, which was approach to that of silicon.

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