Abstract
Six glass/ceramic composite materials were prepared from pure alumina and borosilicate glass (BSG) with chemical composition of 99.0 Al 2O 3 and 80.5 SiO 2, 12.9 B 2O 3, 3.8 Na 2O, 2.2 Al 2O 3, 0.4 K 2O and 0.2 CaO wt.%, respectively. These batches were sintered at different firing temperatures up to 1300 °C. XRD, microstructure and properties, namely thermal expansion, dielectric constant and hardness of prepared composites were examined, respectively. The results reveal that the crystallization of borosilicate glass in glass/alumina composite can be prevented by varying the alumina content in the glass matrix, by which the diffused aluminum ion change the structure of glass. When approximately ⩾30 wt.% of alumina filler is added, the structure of glass changes enough to decrease the formation of cristobalite crystals and consequently decrease the thermal expansion coefficient and dielectric constant. In glass/alumina system, phase formation is influenced by firing temperature and alumina content as follows: (a) when alumina content and firing temperature are low, the precipitated phase is cristobalite, (b) at high temperature and high alumina content, mullite is formed in the glass phase.
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