Abstract
In order to clarify the crystallization mechanism of glass phase in glass/ceramic composites, relations between crystallization behaviour and the particle size of borosilicate glass were investigated. Further by changing alumina content of the glass/ceramic composites, the effects of alumina on crystallization of glass in glass/ceramic composite were discussed. The crystallization of borosilicate glass powders depend on particle size and cristobalite crystals are formed in the glass powders of less than 5mm diameter. The glass/ceramic composites containing 25wt% alumina do not show any crystallization tendencies and have thermal expansion coefficient (TEC) close to that of Si single crystal. Al in alumina particles diffuse in glass phase during firing. The Al and Si take places of the network former of glass. Consequently, these changes of composition and viscosity in glass phase is supposed to prevent the crystallization.
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