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Preparation of Whisker β‐Spodumene Glass–Ceramics
Author(s) -
Anmin Hu,
Ming Li,
Dali Mao
Publication year - 2006
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/j.1551-2916.2005.00681.x
Subject(s) - spodumene , whisker , microstructure , materials science , scanning electron microscope , ceramic , composite material , phase (matter) , crystal (programming language) , flexural strength , crystal growth , mineralogy , glass ceramic , chemical engineering , crystallography , chemistry , organic chemistry , computer science , programming language , engineering
β‐spodumene glass–ceramics with a whisker‐like microstructure were prepared from the following materials (in wt%): 64.5 SiO 2 , 18.0 Al 2 O 3 , 4.2 Li 2 O, 4 ZrO 2 , and 8 MgF 2 . Scanning electron microscope (SEM) analysis showed that phase separation in the base glass leads to the formation of a primary crystal phase of MgF 2 that promotes the formation of spherical β‐spodumene. Whisker spodumene crystals surrounded by spherical crystals are observed at 720°C after 1 h, and the whisker crystals grow at the cost of spherical crystals with increasing temperature and time. The flexural strengths of the glass–ceramics reach a maximum of 228 MPa after heat treatment at 850°C for 1 h.