Interface controlled active fracture modes in glass-ceramics
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The active fracture modes in glass-ceramics, produced by controlled crystallization from three starting vitreous products containing PbO and SiO2, were studied and compared. The goal was to examine the active fracture modes in PbO-rich glass-ceramic materials, where the main glass former was PbO, and compare these results with those reported in the literature, where the main glass former was SiO2. The influence of composition, shape and mean size of the ceramic phase on the active fracture modes of the glass-ceramics was also examined. It was observed that the microhardness and fracture toughness of the starting vitreous products decrease with increasing PbO content. Increase in the relative amount of SiO2 resulted in a decrease of the percentage of the ceramic phase. Glass-ceramics with higher PbO content showed typical behaviour of high toughness material, i.e. intergranular fracture mode, with lower microhardness value. Glass-ceramics with lower PbO content showed typical behaviour of high-strength material, i.e. transgranular fracture mode, with higher microhardness value.
KeywordsFracture Toughness Fracture Mode Batch Composition Crack Propagation Mode Vickers Diamond Indenter
This work was co-funded by the European Social Fund and National resources, through the “PYTHAGORAS II” program.
- 1.Hölland W, Beal G (2002) Glass-ceramic technology. ACS, Westerville, p 4Google Scholar
- 6.Shelby JE (1997) Introduction to glass science and technology. RSC Paperbacks, Cambridge, p 78Google Scholar
- 9.Amin KA (2000) Engineered materials handbook: ceramics and glasses. ASM International, p 599Google Scholar
- 12.Vogel W (1994) Glass chemistry, 2nd edn. Springer-Verlag, p 158Google Scholar
- 13.Strnad Z (1986) Glass-ceramic materials. Elsevier, Amsterdam, p 230Google Scholar
- 16.Doremus RH (1994) Glass science and technology. John Wiley and Sons, New York, p 163Google Scholar