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Influence of Particle Size on Nonisothermal Crystallization in a Lithium Disilicate Glass
Author(s) -
Marques Leyliane E.,
Costa Alberth M. C.,
Crovace Murilo C.,
Rodrigues Ana C. M.,
Cabral Aluisio A.
Publication year - 2015
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.13380
Subject(s) - crystallization , materials science , particle size , particle (ecology) , crucible (geodemography) , lithium disilicate , lithium (medication) , activation energy , analytical chemistry (journal) , mineralogy , chemical engineering , composite material , chemistry , ceramic , chromatography , oceanography , medicine , computational chemistry , endocrinology , engineering , geology
In this study, lithium disilicate ( LS 2 ) glass samples with different particle sizes ranging from less than 105 to 850 μm were prepared. These specimens were inserted in a Pt‐Rh DSC crucible and heated to 850°C at different rates (ϕ = 0.5–30 K/min) to identify their crystallization peaks. The activation energies for the overall crystallization ( E ) and the Avrami coefficient ( n ) were evaluated using different nonisothermal models. Specifically, n was evaluated using the Augis–Benett model and the Ozawa method, and E was evaluated using the Kissinger and Ligero methods. As expected, the coarse particles mainly crystallized in the volume, while surface crystallization was predominant in the samples with particle sizes of less than 350 μm. This result was confirmed through SEM analysis of the double stage heat‐treated samples. In contrast with previous studies, our results demonstrated that the activation energy decreased as the particle size increased. In addition, no clear correlation between the peak intensity (δ T p ) and the particle size was observed.