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Start Over Author "Yuping Zeng" Journal ceramics international
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2. Effect of Y2O3 addition on the properties of reaction-bonded porous SiC ceramics

Author

Dongliang Jiang, Shuqiang Ding, Yuping Zeng, and Sumin Zhu

Subjects
Materials science, Scanning electron microscope, Process Chemistry and Technology, Mineralogy, Mullite, Microstructure, Surfaces, Coatings and Films, Electronic, Optical and Magnetic Materials, chemistry.chemical_compound, chemistry, Flexural strength, visual_art, Materials Chemistry, Ceramics and Composites, visual_art.visual_art_medium, Silicon carbide, Ceramic, Graphite, Composite material, Porosity
Abstract

Porous SiC ceramics were fabricated without and with Y 2 O 3 addition from SiC, Al 2 O 3 and graphite in air by the in situ reaction bonding process. This process is based on the oxidation of SiC and the mullitization between Al 2 O 3 and oxidation-derived SiO 2 . SiC particles are bonded by the mullite (3Al 2 O 3 ·2SiO 2 ) and SiO 2 . The pores are produced by both stacking SiC particles and burning out graphite. Comparison of phase composition, microstructure, flexural strength, open porosity and pore size distribution of reaction-bonded porous SiC ceramics without and with Y 2 O 3 addition was conducted. Moreover, the effect of Y 2 O 3 content was investigated. Due to the enhancement of neck formation (bonding part between SiC particles) by the addition of Y 2 O 3 , a high strength of 27.5 MPa was achieved at an open porosity of 44.4%.

Published
2006
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