SYNTHESIS AND CHARACTERIZATION OFSi3N4@Al(OH)3–Y(OH)3CORE-SHELL COMPOSITE PARTIC3LES

Jie-Guang Song (), Gang-Chang Ji, Shi-Bin Li and Lian-Meng Zhang
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Jie-Guang Song: College of Materials Science and Engineering, Jiujiang University, Jiujiang 332005, China
Gang-Chang Ji: College of Materials Science and Engineering, Jiujiang University, Jiujiang 332005, China
Shi-Bin Li: College of Materials Science and Engineering, Jiujiang University, Jiujiang 332005, China
Lian-Meng Zhang: State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China

Surface Review and Letters (SRL), 2008, vol. 15, issue 05, 581-585

Abstract: Silicon nitride (Si3N4) has attracted substantial interest because of its extreme chemical and physical properties, but the sintering densification ofSi3N4is difficult, and it is easily oxidized in the high-temperature air to impact high-temperature strength, which restricts its applied range. In order to decrease the oxidization and improve the strength ofSi3N4at high temperature, the surface ofSi3N4is coated withAl(OH)3andY(OH)3to synthesisSi3N4@Al(OH)3–Y(OH)3core-shell composite particles. Through TEM, XRD, and BET analysis, when pH is about 9,Si3N4@Al(OH)3–Y(OH)3core-shell composite particles are successfully synthesized by co-precipitation methods. Coating layer is about 200 nm, which is compaction and conformability. Dispersion of coatedSi3N4withAl(OH)3andY(OH)3particles are very good. Synthesis ofSi3N4@Al(OH)3–Y(OH)3core-shell composite powder will lay the foundation for preparing high-performanceYAG/Si3N4multiphase ceramic materials.

Keywords: Silicon nitride; composite particles; co-precipitation methods; synthesis and characterization (search for similar items in EconPapers)
Date: 2008
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DOI: 10.1142/S0218625X08011779

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