Abstract
Sintered glass-ceramics based on cordierite modified glass with partial substitution of aluminum by boron [(Mg2Al4−xBxSi5O18 (x = 1 and 3)] were prepared mainly from natural raw materials. Mono-mineralic cordierite was formed at all the sintering temperatures. The results of infrared spectra confirmed the cordierite presence. The microcrystalline structure shows scattered hexagonal cordierite crystals, either at the micro- or nano-scale, in a glassy groundmass. The microanalysis of the hexagonal crystals indicated the incorporation of some elements in the cordierite structure. The density of the sintered samples was 2.0857 and 1.4857 g/cm 3 and the coefficient of thermal expansion, from room temperature up to 500 ∘C, was in the range from 10.46 and 25.60 × 10−7∘C−1. The microhardness value was 5.64 GPa and 5.90 GPa.
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