Effect of Y₂O₃ Content on the Properties of Alumina-Based Ceramic Cores

Abstract:

A series of alumina cores with different content of yttria were prepared by sintered at 1450°C. The flexural strength at room temperature, high temperature deformation and shrinkage rate of alumina based ceramic core were determined. the phase evolution and microstructure were studied by scanning electron microscopy (SEM) ,X-ray diffraction (XRD).The optimal yttria content on the combined properties of these cores were discussed. The results explained that The Al₂O₃ particles reacted with some Y₂O₃ particles to form a polycrystalline composition 3Y₂O₃·5Al₂O₃ (YAG), which activated the lattice and promoted sintering. Most of yttria, however, were concentrated in the ceramic grain boundaries, playing a role in improving grain refinement and microstructure; the cores achieved the best comprehensive performance when the content of yttria was 10%.

• Periodical: Applied Mechanics and Materials (Volumes 488-489)
• Pages: 145-149
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.488-489.145
• Online since: January 2014
• Authors: Rong Feng Wang*, De Ming Zhang, Ou Yang Zhuang, Hai Lin Xu, Wen Sheng Huang, Da Ming Xie
• Keywords: Alumina-Based, Ceramic Cores, Y₂O₃ Content, YAG

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