摘要
从影响α-sialon材料自韧化的关键因素出发,研究了Y,Yb,Nd等不同稀土类添加物、烧结工艺和后续热处理对α-sialon显微组织与力学性能的影响。结果表明:控制其反应动力学是获得自韧化α-sialon的关键。烧结工艺及后续热处理对α-sialon棒晶生长的促进作用依赖于其成分及掺杂的稀土氧化物类型。Y-α-sialon在1300～1700℃长时间低温退火,未发生α相向β-sialon相转变,但1500℃长时间退火将导致α-sialon的晶粒形貌由棒状向等轴状转变,引起材料的脆化。
The effects of rare-earth additives （yttrium, ytterbium, and/or neodymium）, sintering processes, and post heat-treatment on the microstructure and mechanical properties of α-sialon ceramics were studied. The results reveal that control of the kinetics for α-sialon formation is essential for the growth of self-toughening elongated grains. The effects of the sintering process and post heat-treatment on the development of elongated α-sialon grains are dependent on its composition and the type of additive rare earth cations. No αphase to β-sialon phase transformation was observed in the investigated Y-α-sialon after annealing in the temperature range from 1 300 ℃ to 1 700 ℃, whereas annealing at 1 500 ℃ changed the morphology of the elongated α-sialon grains to equiaxed, thus decreasing its toughness.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2007年第8期1017-1023,共7页
Journal of The Chinese Ceramic Society
基金
国家自然科学基金重点(50632020)资助项目
关键词
Α-SIALON
自韧化
微结构控制
热稳定性
力学性能
alpha-siMon
self-toughening
microstructure control
thermal stability
mechanical properties
