TY - JOUR
T1 - Thermal oxidation of sintered beta-sialon (z=3) ceramics in atmospheres with water vapor
AU - Kiyono, H.
AU - Shimada, S.
PY - 2004/1/1
Y1 - 2004/1/1
N2 - Thermal oxidation of β-sialon (Si6-zAlzO zN8-z, z = 3) ceramic was investigated at 1300 to 1600°C in dry (Ar/O2= 90/10 kPa), wet O2 (Ar/O 2/H2O = 80/10/10 kPa) and wet (Ar/H2O = 90/10 kPa) atmospheres. Oxidation was followed from weight gains using thermogravimetry and the oxidized sample was characterized by scanning electron microscope, electron probe microanalysis and X-ray powder diffraction. Oxidation kinetics in the three atmospheres were represented by a parabolic rate model except for at 1600°C. The wet and wet O2 oxidation rates were greater than the dry oxidation, the degree decreasing with rising temperature from 1300 to 1500°C, while wet and wet O2 oxidation at 1600°C was even faster again than the dry oxidation. It was found that the scale formed by the dry, wet and wet O2 oxidation consisted of mullite and cristobalite at 1300-1500°C and of mullite and SiO2 rich aluminosilicate glass at 1600°C.
AB - Thermal oxidation of β-sialon (Si6-zAlzO zN8-z, z = 3) ceramic was investigated at 1300 to 1600°C in dry (Ar/O2= 90/10 kPa), wet O2 (Ar/O 2/H2O = 80/10/10 kPa) and wet (Ar/H2O = 90/10 kPa) atmospheres. Oxidation was followed from weight gains using thermogravimetry and the oxidized sample was characterized by scanning electron microscope, electron probe microanalysis and X-ray powder diffraction. Oxidation kinetics in the three atmospheres were represented by a parabolic rate model except for at 1600°C. The wet and wet O2 oxidation rates were greater than the dry oxidation, the degree decreasing with rising temperature from 1300 to 1500°C, while wet and wet O2 oxidation at 1600°C was even faster again than the dry oxidation. It was found that the scale formed by the dry, wet and wet O2 oxidation consisted of mullite and cristobalite at 1300-1500°C and of mullite and SiO2 rich aluminosilicate glass at 1600°C.
KW - Aluminosilicate glass
KW - Beta-sialon
KW - Diffusion limiting rate
KW - Oxidation
KW - Water vapor
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M3 - Conference article
AN - SCOPUS:8644246078
SN - 1013-9826
VL - 264-268
SP - 893
EP - 896
JO - Key Engineering Materials
JF - Key Engineering Materials
IS - II
T2 - Proceedings of the 8th Conference and Exhibition of the European Ceramic Society
Y2 - 29 June 2003 through 3 July 2003
ER -