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 |
|
|