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Thermomechanical Properties of β-Sialon Synthesized from Kaolin
Authors:Hong-Lim Lee  Hun-Jin Lim  Shin Kim  Hyung-Bock Lee
Affiliation:Department of Ceramic Engineering, Yonsei University, Seoul 120–749, Korea
Abstract:β-Sialon powder was synthesized by the simultaneous reduction and nitridation of Hadong kaolin at 1350°C in an N2–H2 atmosphere, using graphite as a reducing agent. The average particle size of β-sialon powder was about 4.5 μm. The synthesized β-sialon powder was pressureless sintered from 1450° to 1850°C under a N2 atmosphere. The relative density, modulus of rupture, fracture toughness, and microhardness of β-sialon ceramics sintered at 1800°C for 1 h were 92%, 248 MPa, 2.8 MN/m3/2, and 13.3 GN/m2, respectively. The critical temperature difference (ΔTc) in water-quench thermal-shock behavior was about 375°C for the synthesized β-sialon ceramics.
Keywords:sialons  metals  kaolin  thermomechanical properties  graphite
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