Diopside–Ca-Tschermak clinopyroxene based glass–ceramics processed via sintering and crystallization of glass powder compacts

2007 ◽  
Vol 27 (5) ◽  
pp. 2325-2331 ◽  
Author(s):  
A. Goel ◽  
D.U. Tulyaganov ◽  
S. Agathopoulos ◽  
M.J. Ribeiro ◽  
R.N. Basu ◽  
...  
Keyword(s):  
Glass Powder ◽  
Glass Ceramics ◽  
Powder Compacts ◽  
Crystallization Of Glass

Low temperature synthesis of anorthite based glass-ceramics via sintering and crystallization of glass-powder compacts

2006 ◽  
Vol 26 (13) ◽  
pp. 2503-2510 ◽  
Author(s):  
V.M.F. Marques ◽  
D.U. Tulyaganov ◽  
S. Agathopoulos ◽  
V.Kh. Gataullin ◽  
G.P. Kothiyal ◽  
...  
Keyword(s):  
Low Temperature ◽  
Glass Powder ◽  
Glass Ceramics ◽  
Low Temperature Synthesis ◽  
Temperature Synthesis ◽  
Powder Compacts ◽  
Crystallization Of Glass

Sintering and Crystallization of Glass-Ceramics for Optical Fiber Ferrule

2007 ◽  
Vol 336-338 ◽  
pp. 1840-1842
Author(s):  
Y.M. Zhu ◽  
Xia Wan Wu ◽  
Zhi Hong Li
Keyword(s):  
Heat Treatment ◽  
Heat Treatment Temperature ◽  
Glass Powder ◽  
Treatment Time ◽  
Glass Ceramics ◽  
Treatment Temperature ◽  
Residual Glass ◽  
Sio2 Glass ◽  
Powder Compacts ◽  
Crystallization Of Glass

The crystallization and sintering of the Li2O-Al2O3-SiO2 glass powder compacts were studied. Results showed the relative densities of the sintered compacts with lower crystallization temperatures were higher than those with higher crystallization temperatures. A small amount of residual glass in the crystallized compact was good for sintering and densification. Compared with the heat treatment time, the heat treatment temperature was an important factor for the crystallization and sintering of glass powder compacts. The crystallized compacts with a small amount of residual glass should be sintered at a relatively higher heating rate under the prerequisite of keeping sintered compacts from deformation.

Superconducting glass-ceramics in BiSrCaCu2Al0.5Ox—Comparison between rod and powder compacted specimens

1991 ◽  
Vol 6 (6) ◽  
pp. 1156-1159 ◽  
Author(s):  
Kazumi Hirata ◽  
Yoshihiro Abe
Keyword(s):  
Glass Ceramic ◽  
Glass Powder ◽  
Crystallization Process ◽  
Glass Ceramics ◽  
Oxygen Absorption ◽  
Superconducting Properties ◽  
Powdered Glass ◽  
Glass Rods ◽  
Powder Compacts

Superconducting properties are studied for glass-ceramics which were prepared by reheating glass rods and the glass powder compacts in the BiSrCaCu2Al0.5Ox system, respectively. The glass-ceramic rod specimens obtained by reheating rod glass at 800–830 °C for 50 h have a Tc (R = 0) of 85 K, while the disk specimens obtained by reheating the powdered glass compacts in the same way do not exhibit superconductivity above 77 K. This difference in superconductivity between the specimens is discussed in terms of the crystallization process and the amount of oxygen absorption of the specimens during heating.

The role of K2O on sintering and crystallization of glass powder compacts in the Li2O–K2O–Al2O3–SiO2 system

2012 ◽  
Vol 32 (10) ◽  
pp. 2283-2292 ◽  
Author(s):  
Hugo R. Fernandes ◽  
Dilshat U. Tulyaganov ◽  
Maria J. Pascual ◽  
Vladislav V. Kharton ◽  
Aleksey A. Yaremchenko ◽  
...  
Keyword(s):  
Glass Powder ◽  
Sio2 System ◽  
Powder Compacts ◽  
Crystallization Of Glass

Sintering Behavior of LZS Glass-Ceramics

2012 ◽  
Vol 727-728 ◽  
pp. 1028-1033 ◽  
Author(s):  
Jaime Domingos Teixeira ◽  
Antonio Pedro Novaes de Oliveira ◽  
Lourival Boehs ◽  
Francielly Roussenq Cesconeto ◽  
Cristina Siligardi ◽  
...  
Keyword(s):  
Glass Powder ◽  
Bending Strength ◽  
Glass Ceramics ◽  
Thermal Shrinkage ◽  
Sintering Behavior ◽  
Maximum Hardness ◽  
X Ray Diffraction ◽  
Time Intervals ◽  
X Ray ◽  
Powder Compacts

Sintering and crystallization behaviors of a LZS glass-powder were investigated by means of thermal shrinkage, differential thermal analysis, X-ray diffraction as well as density and mechanical properties measurements. The melted glass, 9.56Li2O.22.36ZrO2.68.08SiO2(wt%) first was cast into water to provide a frit for milling. The milled glass powder (mean particle size 5.0 µm) was then uniaxially pressed at 100 MPa and the obtained samples were isothermally sintered in the 800-950°C temperature range in air for appropriated time intervals (15-120 min). Sintering was found to start at about 640°C and crystallization took place just after completion of sintering and was almost complete at 920°C. The glass powder compacts crystallized into lithium and zircon silicates so that glass-ceramics with relative densities between 84 and 99% were obtained reaching maximum hardness and bending strength values of 8 ± 0.5 GPa and 214 ± 20 MPa, respectively.

scholarly journals Ferrosilicate glass ceramics based on wastes from ore concentration

2021 ◽  
pp. 95-103
Keyword(s):  
Surface Layer ◽  
Iron Ore ◽  
Glass Ceramics ◽  
Redox Conditions ◽  
Glass Technology ◽  
Crystalline Phases ◽  
Reducing Conditions ◽  
Deep Layers ◽  
Hematite Fe2o3 ◽  
Crystallization Of Glass

We showed in this work that there is a possibility of recycling the wastes derived from iron ore concentration by using glass technology. The compositions of new glass ceramics with high technological and decorative properties were developed. The influence of Al2O3, MgO and Na2O additives to the waste from ore benefication on the parameters of the synthesized glass and its crystallization products was studied. The optimal temperatures of synthesis, annealing and crystallization of glass samples in the systems (Fe2O3–FeO)–SiO2–Al2O3–Na2O and (Fe2O3–FeO)–SiO2–Al2O3–MgO were shown to be 1450100С, 500–6000С and 700–8000C, respectively. It was established that the redox conditions of crystallization of glasses in the system (FeO–Fe2O3)–SiO2–Al2O3–Na2O strongly affect the nature of the iron-containing phases that are formed: oxidative conditions favors the formation of hematite (Fe2O3) and aegirinite (Na2OFe2O34SiO2), whereas reducing conditions contributes to the formation of wustite (FeO) and fayalite (2FeOSiO2). In the system (FeO–Fe2O3)–SiO2–Al2O3–MgO under both oxidative and reducing conditions of crystallization, the same crystalline phases appear: olivine (2(Mg,Fe)OSiO2), hercin (FeOAl2O3) and iron metasilicate (FeOSiO2). It was shown that the crystallization of samples under reducing conditions allows producing materials with higher microhardness. The surface layer of glasses and glass ceramics exhibited less microhardness than their deep layers.

Sign in / Sign up

Export Citation Format

Share Document