Preparation and Properties of Translucent Y-o-Sialon Ceramics by Two-Steps Hot Pressing
Yttrium-doped α-sialon ceramics with different compositions were prepared by two-steps hot pressing (first heating to 1750 ℃ holding for 60 min,then continue heating to 1900 ℃ holding for 60 min) at 25 MPa in nitrogen,their design compositions were Y0.4Si9.8Al2.2O1.0N15 (Y1210,m=1.2 and n=1.0),Y0.4Si9.7Al2.3O1.1N14.9 (Y1211,m=1.2 and n=1.1) and Y0.4Si9.6Al2.4O1.2N14.8 (Y1212,m=1.2 and n=1.2)respectively,and the effects of n value on phase composition,microstructure and optical property were approached.It is found that only α-sialon is detected in Y1210,however,there exist β-sialon besides of major phase α-sialon in Y 1211 and Y1212.The density of sintered sample decreases with the increase of n value,higher n value contributes to elongated grain growth,and both the size and content of elongated grain increase with the increase of n value.The samples all show light transmission in the near infrared and infrared region,and their maximal optical transmittances decrease with the increase of n value.All those indicate that lower n value contribute to higher density,single α-sialon phase,smaller size and lower content of elongated grain,which is better for the preparation of higher optical transmittance Y-t-sialon.
α-sialon Two-steps hot pressing Microstructure Optical property
Shan Yingchun Xu Jiujun Guan Chunlong Li Jiangtao
Department of Materials Science and Engineering, Dalian Maritime University, Dalian 116026, China School of Materials Science and Engineering, Henan University of Technology, Henan 450007, China Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100080, China
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
661-663
2009-08-16（万方平台首次上网日期，不代表论文的发表时间）