Influence of Pressure on the Crystallization in SiO2f/SiO2 Composites

2007 ◽  
Vol 336-338 ◽  
pp. 1236-1238
Author(s):  
Chang Ming Xu ◽  
Shi Wei Wang ◽  
Xiao Xian Huang ◽  
Jing Kun Guo
Keyword(s):  
Phase Composition ◽  
Crystalline Phase ◽  
Hot Pressing ◽  
Crystallization Behavior ◽  
Nucleation Mechanism ◽  
Composition Analysis ◽  
Pressing Pressure ◽  
Surface Nucleation ◽  
Bulk Nucleation ◽  
Phase Composition Analysis

The influence of pressure on the crystallization behavior in SiO2f/SiO2 composites hotpressed at 1350°C was studied. The crystalline phase composition analysis on SiO2f/SiO2 composites revealed that the formation of cristobalite was promoted when the hot-pressing pressure ≤ 12 MPa, however suppressed with higher pressure applied. It can be ascribed to the nucleation mechanism change from surface nucleation to bulk nucleation. Analysis on relative density as well as fracture microstructure of SiO2f/SiO2 composites confirmed the conclusion.

Quantitative Phase-Composition Analysis of Liquid-Phase-Sintered Silicon Carbide Using the Rietveld Method

2004 ◽  
Vol 83 (9) ◽  
pp. 2282-2286 ◽  
Author(s):  
Angel L. Ortiz ◽  
Francisco L. Cumbrera ◽  
Florentino Sánchez-Bajo ◽  
Fernando Guiberteau ◽  
Huiwen Xu ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Phase Composition ◽  
Liquid Phase ◽  
Rietveld Method ◽  
Composition Analysis ◽  
Quantitative Phase ◽  
Phase Composition Analysis ◽  
Sintered Silicon

scholarly journals The devitrification of PbO-B2O3-ZnO glass doped with Li2O

2000 ◽  
Vol 65 (12) ◽  
pp. 891-898 ◽  
Author(s):  
Vladimir Zivanovic ◽  
Nikola Blagojevic ◽  
Snezana Grujic ◽  
Ljiljana Karanovic ◽  
Branislava Bozovic
Keyword(s):  
Thermal Analysis ◽  
Differential Thermal Analysis ◽  
Phase Composition ◽  
Powder Diffraction ◽  
Crystalline Phase ◽  
Crystallization Behavior ◽  
X Ray ◽  
Crystallization Ability ◽  
Lower Temperature ◽  
Xrpd Analysis

In this paper the effect of the addition of Li2O on the crystallization behavior of PbO-B2O3-ZnO glass was investigated by the differential thermal analysis (DTA) and X-ray powder diffraction (XRPD) methods. The crystallization ability, as well as the crystalline phases which develop during devitrification of the glass were examined. The results of DTA and XRPD analysis showed that the addition of Li2O varies the sequence of the crystallization as well as the phase composition of the crystalline phase. The glasses with Li2O crystallize at a lower temperature (360?C) with 4Li2O.4ZnO.3B2O3 as the major crystalline phase. The base PbO-B2O3-ZnO glass crystallizes at 480?C with PbO.2ZnO.B2O2 as the major crystalline phase.

Phase composition analysis of hydrous aluminium oxides by thermal analysis and infrared spectrometry

Talanta ◽  
1992 ◽  
Vol 39 (12) ◽  
pp. 1583-1586 ◽  
Author(s):  
Zs. Wittmann ◽  
E. Kántor ◽  
K. Bélafi ◽  
L. Péterfy ◽  
L.P. Farkas
Keyword(s):  
Thermal Analysis ◽  
Phase Composition ◽  
Infrared Spectrometry ◽  
Composition Analysis ◽  
Phase Composition Analysis
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