Clarifying the mechanism of fabricating transparent powder sintered glass-ceramics
Transparent glass-ceramics can be prepared by pressureless sintering under air atmosphere using glass particles with irregular shapes and a wide size distribution. In this study, the effect of densification and crystallization on the transparency of powder-sintered glass-ceramics was investigated by non-isothermal sintering dynamic simulation and experimental micro-morphological observation. Across a range of particle sizes, the smaller glass particles with higher surface nucleation probability tend to preferentially cluster compared to the larger ones. This is favourable for complete densification prior to crystallization, and hence relatively high transparency. There exist two types of pores within the sintered glass-ceramics, i.e. large pores formed by viscous flow and fine pores formed by crystallization, respectively. The latter type of pore has a more profound impact on the reduction of transparency than the former one.
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Document Type: Research Article
Publication date: December 1, 2018