研究目的
To investigate the crystallization kinetics of lithium aluminosilicate glass powder using model-free and model-fitting methods to determine kinetic parameters and understand the crystallization mechanism.
研究成果
Model-free methods provide reliable activation energy values (400-470 kJ/mol) with slight decreases during crystallization. Avrami-Erofeev model is suitable for describing crystallization, with bulk crystallization predominant. Theoretical DSC curves based on model-free parameters show good agreement with experimental data, confirming the utility of these methods for kinetic analysis.
研究不足
The study assumes certain approximations in kinetic models; the complexity of crystallization mechanisms may not be fully captured by single models. Variations in activation energy and Avrami coefficient indicate potential uncertainties in model selection.
1：Experimental Design and Method Selection:
Non-isothermal experiments were conducted using differential scanning calorimetry (DSC) to monitor crystallization behavior. Model-free methods (OFW, KAS, FR) and model-fitting methods (e.g., Coats-Redfern) were employed to analyze kinetics.
2：Sample Selection and Data Sources:
A glass composition of
3：2Li2O-6SiO2-49Al2O3-3TiO2-4BaO-97ZnO (mol%) was prepared from raw materials including lithium carbonate, silica, alumina, rutile, zinc oxide, and barium carbonate. Glass frit was melted at 1570°C, quenched, and milled to a mean particle size of 5μm. List of Experimental Equipment and Materials:
DSC equipment (NETZSCH DSC 404C), planetary mill (Retsch pm400), zirconia media and balls (3 mm diameter), raw materials from various suppliers.
4：Experimental Procedures and Operational Workflow:
For DSC analysis, 40mg powder was used with heating rates of 2, 5, 10, 15, and 20°C/min up to 900°C, repeated three times per rate. Data were normalized, and Thermokinetics
5：1 software was used for calculations. Data Analysis Methods:
Activation energy and Avrami coefficient were calculated using isoconversional methods and model-fitting approaches; theoretical DSC curves were compared with experimental data.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
