Abstract
To clarify the sintering process of glass/alumina composites, we examined the microstructure of glass/alumina composites fired at various temperatures using SEM (Scanning Electron Microscope). The formation of pores in glass/alumina composites was studied by observing the softening and foaming phenomena of glass. The softening and fluidity of glass above 700°C promote the densification of glass/alumina composites. In the composite around 800°C, non-spherical pores, which remain after incomplete sintering, were observed. Above 900°C, the pores were spherical. During firing, several gases evolved from borosilicate glass in glass/alumina composites. The result suggests that these gases are dependent on the formation of the spherical pores.
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