Thermal Shock Behavior of Nd-Doped α-Sialon Ceramics
Nd-α-sialons with the stoichiometric composition of Nd0.333Si10Al2ON15 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 α-sialon grains formed together with a small amount of intergranular phase M (Nd2Si3-xAlxO3+xN4-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.
α-sialon Nd2O3 thermal shock
Chunfeng Liu Feng Ye Yu Zhou Yudong Huang Jianmin Zhou
Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150001, P R China School of Chemical Engineering and Technology, Harbin Institute of Technology, Harbin 150001,P R Chi
国际会议
The Sixth China International Conference on High-Performance Ceramics(第六届中国先进陶瓷国际研讨会(CICC-6))
哈尔滨
英文
130-133
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）