Sintering and crystallization behavior in B2O3 contained Li2O-Al2O3-SiO2 glass

Im, Sanghyeok; Kim, Dong Hwan; La, Young-Hoon; Kim, Nam‐Jin; Hwang, Chawon; Cha, Jihoon; Ryu, Bong Ki

doi:10.3365/eml.2010.06.071

Cited by 9 publications

(5 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The two-dimensional surface-dominated crystallization has an Avrami parameter of 1, and the three-dimensional bulk-dominated crystallization has an Avrami parameter of 3 . In the present study, the obtained Avrami parameter was not an integer, indicating that crystallization occurred through more than one mechanism. , In the present system, crystallization occurred in both three- and two-dimensional growths simultaneously with heterogeneous nucleation. According to Xu et al, the Avrami parameter is equal to the dimensionality when the number of nuclei is fixed during the nucleation process.…”

Section: Resultsmentioning

confidence: 42%

“…The Avrami parameter implies the growth direction number and the nucleation and crystal growth mechanisms . The two-dimensional surface-dominated crystallization has an Avrami parameter of 1, and the three-dimensional bulk-dominated crystallization has an Avrami parameter of 3 . In the present study, the obtained Avrami parameter was not an integer, indicating that crystallization occurred through more than one mechanism. , In the present system, crystallization occurred in both three- and two-dimensional growths simultaneously with heterogeneous nucleation.…”

Section: Resultsmentioning

confidence: 46%

“…The crystallization kinetics can be determined by the Avrami parameter and activation energy for crystallization. The Avrami parameter, which is the order of crystallization, can be determined using Ozawa’s equation where α is the volume fraction of the crystal, β is the heating rate, T is the temperature, and n is the Avrami parameter. α can be directly calculated from the partial area of the crystallization peak in the DTA curve where A 0 is the total area of crystallization peak between the start temperature ( T 1 ) and the end temperature ( T 2 ) of crystallization, and A is the area between T 1 and the selected temperature T ( T 1 ≤ T ≤ T 2 ) .…”

Section: Resultsmentioning

confidence: 99%

“…Based on the Johnson–Mehl–Avrami (JMA) equation, ,,, the activation energy for crystal growth was determined. It was assumed that the JMA equation can be adopted for nonisothermal crystallization condition within a narrow temperature range …”

Section: Resultsmentioning

confidence: 99%

See 3 more Smart Citations

A Value-Added Synthetic Process Utilizing Mining Wastes and Industrial Byproducts for Wear-Resistant Glass Ceramics

Kim

Park

2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

This study investigates an advanced synthetic process that produces wear-resistant glass ceramics from mining wastes and smelting byproducts. By mixing gold tailings, red mud, waste limestone, and ferronickel slag at a weight ratio of 25:30:15:30, glass ceramics with chemical compositions and crystalline phases similar to those of fused cast basalt were obtained. The proposed system provided a much higher compressive strength (796 MPa) than fused cast basalt (300–600 MPa); this is attributed to a high ferric-to-ferrous ratio that provides more nucleation sites. Through X-ray diffraction, differential thermal analysis, and scanning electron microscopy analyses, the optimal thermal treatment temperature was determined to be above 1110 K, and the nucleation and formation of distinct crystalline grains were revealed above 1173 K. The crystallization kinetics and activation energy of the glass ceramics fabricated were studied and compared with those of fused cast basalt. The Avrami parameter of the former was determined to be 2.46 ± 0.12, indicating the formation of two- and three-dimensional crystal growths with heterogeneous nucleation. The high crystallization activation energy (381.35 kJ/mol) found implied a high structural bonding. Finally, the cost of the process was compared with that of conventional fused cast basalt, and the environmental impact of the former was evaluated.

show abstract

Section: Resultsmentioning

confidence: 42%

Section: Resultsmentioning

confidence: 46%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

See 2 more Smart Citations

A Value-Added Synthetic Process Utilizing Mining Wastes and Industrial Byproducts for Wear-Resistant Glass Ceramics

Kim

Park

2020

ACS Sustainable Chem. Eng.

View full text Add to dashboard Cite

show abstract

“…The addition of B 2 O 3 in LAS composition (1:1:4) having and TiO 2, reduced the crystallisation temperature and activation energy by reducing the viscosity [165]. Due to the decrease in viscosity or low melting characteristics of B 2 O 3 , its addition was reported to improve the sintering characteristics [165,166]. Qing reported that the addition of B 2 O 3 in LAS lowered sintering temperature, dielectric loss and improved bending strength from 97 to 195 MPa [3].…”

Section: Low Thermal Expansion Glass Ceramicsmentioning

confidence: 99%

Lithium aluminosilicate (LAS) glass-ceramics: a review of recent progress

Venkateswaran

Sreemoolanadhan

Vaish

2021

International Materials Reviews

View full text Add to dashboard Cite

The lithium aluminosilicate system (LAS) is being explored for almost seven decades due to its anomalous and attractive properties (especially low/negative thermal expansion and fast ion conduction) and its commercial significance in consumer as well as strategic sectors. This review introduces current commercial applications of LAS systems, necessary background science, structural features of different LAS crystal systems, including their polymorphs and solid-solutions, and the origin of unusual properties. Significant emphasis is provided on processing transparent, nanocrystalline, low thermal expansion glass-ceramic (LEGC), the role of chemical constituents and additives, the effect of heat-treatment, and microstructural evolution while processing LEGC. Detailed discussions are provided on the following areas: LAS matrix composites, chemical strengthening of glass and glass-ceramic, low temperature co-fired ceramics (LTCC) and associated joining technologies (hydrolysis catalysis bonding, anodic bonding, brazing, etc.) that would further extend the application portfolio of LAS system.

show abstract