首页|Thermal Shock Behavior of Nd-Doped α-Sialon Ceramics
Thermal Shock Behavior of Nd-Doped α-Sialon Ceramics
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NETL
NSTL
Trans Tech Publications Ltd
Nd-α-sialons with the stoichiometric composition of Nd_(0.333)Si_(10)Al_2ON_(15) were obtained by hot-press sintering at 1800℃ for lh. The thermal shock behavior of the Nd-α-sialons was examined by a water-quenching technique. The influence of the thermal shock temperature difference (ΔT) and cycle times on the residual strength was evaluated. Equiaxed a-sialon grains formed together with a small amount of intergranular phase M' (Nd_2Si_(3-x)Al_xO_(3+x)N_(4-x)) and β-sialon phase. The residual strength after a thermal shock tended to decrease gradually with increasing ΔT above 500℃. However, the specimens exhibited an improved residual strength (～94% of the room temperature strength) after a thermal shock of ΔT=1100℃. The residual strength presented a gradual decrease with increasing the thermal shock cycle times at ΔT=1100℃, and was still remained ～55% of the room temperature strength after 11-time cycle. It is contributed to the surface oxidation which may results in the healing of surface cracks and the generation of surface compressive stresses.
NETL
NSTL
Trans Tech Publications Ltd
