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Effect of Silica Sol on the Properties of Alumina‐Based Duplex Ceramic Cores
Author(s) -
Qin Yexia,
Pan Wei,
Zhang Rui,
Du Aibing
Publication year - 2008
Publication title -
international journal of applied ceramic technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.4
H-Index - 57
eISSN - 1744-7402
pISSN - 1546-542X
DOI - 10.1111/j.1744-7402.2008.02181.x
Subject(s) - materials science , ceramic , microstructure , colloidal silica , crystallite , shrinkage , scanning electron microscope , colloid , composite material , core (optical fiber) , chemical engineering , sol gel , creep , mineralogy , metallurgy , nanotechnology , engineering , coating , chemistry
A series of alumina‐based ceramic cores sintered at 1300°C, 1400°C, and 1500°C for 5 h were prepared, and the phases and microstructures were characterized by X‐ray diffraction and scanning electron microscopy. The effect of colloidal silica sols on the properties of ceramic core was discussed. The properties of these materials were determined. The results indicated that the microstructure of the core is characterized by the presence of substantially unreacted Al 2 O 3 particles having a polycrystalline composition consisting essentially of in situ synthesized 3Al 2 O 3 ·2SiO 2 on the surface of the Al 2 O 3 particles. The colloidal silica sol contents do not have an appreciable effect on the densification and shrinkage of the alumina ceramic core. The ceramic cores of 5 wt% colloidal silica sol contents sintered at 1500°C for 5 h showed the smallest creep deformation in the present research.