Fifteen glasses with varying fluorine and potassium.barium contents designed to crystallise to fluorophlogopite have been investigated. The purpose of this investigation is to understand the nucleation and crystallisation behaviour of mica glass-ceramics. This will allow for new materials to be developed for engineering and dental applications. Compositions with high fluorine and potassium contents were shown to lower the glass transition temperature and promote crystallisation of fluorophlogopite by a bulk nucleation mechanism. Volatilisation of SiF4 during heat treatment of the glasses was shown to occur by a surface loss mechanism. Flourine deficient glasses crystallised to both fluorophlogopite and cordierite.
Origin
University Of Leeds, Uk
Journal Title
Glastech Ber Glass Sci & Technol 73 C1 2000 229-236
Sector
Glass Ceramics
Class
GC 800