Rearrangement During Liquid Phase Sintering of Ceramics
Rearrangment in ceramic-glass systems was studied on models. When Al203-spheres of 50/um diameter are sintered in the presence of an alkali-borate glass which does not dissolve any appreciable amount of Al203, large pores form during the early sintering stage and persist even after prolonged sintering at high temperatures. Contrary, sintering with anorthite glass, which in the molten state rapidly dissolves kore than 5 wt. % Al203, leads to particle disintegration and increased densification. Similarly, using Al203-agglomerates instead of solid spheres leads to increased densification. It is shown that the solubility of Al203 in the glass-pharse is more important for densification by arrangement than large changes in the viscosity of the liquid phase.
KeywordsLiquid Phase Sinter Borate Glass Linear Shrinkage A1203 Particle Boundary Penetration
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