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Crystal Nucleation and Growth Rates, Time–Temperature Transformation Diagram, and Mechanical Properties of a SiO 2 –Al 2 O 3 –CaO–MgO–(R 2 O) Glass in the Presence of Cr 2 O 3 , Fe 2 O 3 , and TiO 2 Nucleants
Author(s) -
Rezvani Mohammad,
Marghussian Vahak K.,
Eftekhari Yekta Bijan
Publication year - 2009
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2009.02419.x
Subject(s) - materials science , crystallization , nucleation , scanning electron microscope , diopside , crystal (programming language) , differential thermal analysis , microstructure , crystal growth , composite material , analytical chemistry (journal) , diffraction , mineralogy , chemical engineering , thermodynamics , crystallography , optics , chemistry , chromatography , physics , computer science , engineering , programming language
The crystallization of a SiO 2 –Al 2 O 3 –CaO–MgO–(R 2 O) glass in the presence of Cr 2 O 3 , Fe 2 O 3 , and TiO 2 nucleants was investigated utilizing differential thermal analyses, X‐ray diffraction, and scanning electron microscope. The optimum nucleation and growth rates of aluminian diopside crystals was determined for the most promising glass specimen containing all three nucleants as 10 18 m 3 /s and 6.17 ± 0.55 × 10 −9 m/s, respectively. A time–temperature transformation (TTT) diagram was also constructed for 82 wt% crystallization for the above glass sample and a nose time of ≈55 min was obtained. The bending strength of some heat‐treated specimens were also determined and were related to crystallization behavior and microstructures. The highest strength value obtained was 166 ± 6 MPa.