Contribution to the Characterization of Dust Emissions of Glass Melting Furnaces

Samples of transparent glass-ceramics in the ternary system Li2O-Al2O3-SiO2 (LAS), with Er2O3 as a luminescent dopant, are investigated. The initial glass is obtained by the classical melting technique. In order to induce ceramization of the glass, TiO2 and ZrO2 are added in small amount as nucleating agents. The thermal treatments at 730 and 770°C are carried out to promote formation of titanium zirconate solid solution precipitates. The spatial distribution of the precipitates in the material, their morphology, and their composition are investigated with TEM, HRTEM, HAADF-STEM, EELS and EFTEM. The results demonstrate that with the glass-melting preparation technique it is possible to achieve small nanoparticles with uniform distribution and higher number density than with the sol-gel glass preparation.

Download Full-text

Processing and Characterization of La2O3-SiO2-B2O3 (LSB) Based Glass-Ceramics for LTCC Application

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.280-283.935 ◽

2007 ◽

Vol 280-283 ◽

pp. 935-940 ◽

Cited By ~ 1

Author(s):

Yao Hui A. Lee ◽

Wen Cheng J. Wei

Keyword(s):

Glass Powder ◽

Glass Melting ◽

Tape Casting ◽

Glass Ceramics ◽

Casting Process ◽

Phase Identification ◽

Mass Ratio ◽

Amorphous Phases ◽

Property Measurement

Synthesis of La2O3-SiO2-B2O3 (LSB) based glass-ceramics using glass melting method has een investigated in this study. XRD result showed that some LSB glass systems in this study were ntirely amorphous phases. In addition, TMA results revealed that the LSB/mullite (LSBM) glassceramics ith a mass ratio of 60/40 could be densified at 850oC, which matches the requirements for theLTCC application. Moreover, dispersive behavior of the LSB glass powder with six kinds of commercial ispersants in MEK and toluene solvent had been studied. Furthermore, tape-casting process used for ow-temperature-cofired-ceramic (LTCC) chips was conducted in order to do crystal phase identification, microstructure analysis, and dielectric property measurement.

Download Full-text

Spectroscopic and Surface Crystallization Characterizations of Yttrium-Doped Phosphate Glasses

Crystals ◽

10.3390/cryst12010109 ◽

2022 ◽

Vol 12 (1) ◽

pp. 109

Author(s):

Haijian Li ◽

Hao Zou ◽

Zhihua Sun ◽

Yi Xu ◽

Changjian Wang ◽

...

Keyword(s):

Phosphate Glass ◽

Glass Melting ◽

Glass Ceramics ◽

Glass Network ◽

Melting Process ◽

Spectroscopic Characterization ◽

Phosphate Glasses ◽

Thermal Behaviors ◽

Composition Structure

The composition, structure, and thermal behaviors of yttrium-containing phosphate glasses were studied in this work, and the glass-ceramics were prepared via the two-step crystallization method. The XRD and SEM-EDS results show the forming range of the phosphate glass system and the formation of YPO4 (xenotime) due to the addition of excessive Y2O3. The spectroscopic characterization of these glasses presented shifts of the infrared and Raman bands, demonstrating the depolymerization of the glass network and the formation of novel P–O–Y bonds, and the deconvoluted Raman spectra also exhibited the occurrence of the disproportionation reaction in the glass melting process. The content of non-bridging oxygen (NBOs) from the UV–vis spectra first increased and then decreased with increasing Y2O3. The thermal behaviors show that the Y2O3 reduced the crystallization peak temperature and the thermal stability of the glasses. The crystalline behaviors of the phosphate glass matrix were investigated at different crystallization times of 2–10 h, and a transformation of the crystallization mechanism from surface to volume crystallization was found. The yttrium phosphate glass-ceramics crystallized for 10 h exhibited transformation of the main crystalline phases with increasing Y2O3, and the grain-oriented crystalline surface became irregular.

Download Full-text