Kinetics of rare earth incorporation and its role in densification and microstructure formation of α-Sialon |
| |
| Authors: | Mathias Herrmann Sören Höhn Axel Bales |
| |
| Affiliation: | 1. Key Laboratory for Liquid-Solid Structural Evolution & Processing of Materials of Ministry of Education, No. 17923, Jingshi Road, 250061, Jinan, Shandong, China;2. Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Jingshi Road, 250061, Jinan, Shandong, P. R. China;1. Research Center for Eco Multi-Functional Nano Materials, Sun Moon University, Chungnam 336-708, Republic of Korea;2. State Key Lab of Advanced Technology for Material Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;3. IMRAM, Tohoku University, Sendai 980-8577, Japan;1. School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan, Anhui 232001, China;2. Tianjin Key Laboratory of Thin Film and Opitcs, Tianjin Jinhang Institute of Technical Physics, Tianjin 300192, China;3. State Key Lab of Advanced Technology for Materials Synthesis and Processing, Wuhan University of Technology, Wuhan 430070, China;1. Research Center for Eco-Multifunctional Nano Materials, Sun Moon University, Chungnam, 31460, Republic of Korea;2. Department of Fusion Science and Technology, Sun Moon University, Chungnam, 31460, Republic of Korea;3. Department of Environment and Bio-Chemical Engineering, Sun Moon University, Chungnam, 31460, Republic of Korea |
| |
| Abstract: | The reproducible sintering and microstructure formation of α- and α/β-Sialons is a precondition for the production of such materials with reproducible properties.The Rietveld method was used for quantitative analysis of the phase composition and the kinetics of incorporation of the rare earth into the α-Sialon structure. The analysis showed that in the early stages of sintering more rare earth cations were incorporated into the grains than would be expected from the equilibrium conditions. This was observed for all investigated rare earths (Y, Nd and Yb) with different ionic radii. The consequences for sintering and microstructure formation are the fast disappearing of the transient liquid and the formation of polytypes. The use of excess of rare earth in comparison to the stoichiometric Sialon composition results in a stable residual liquid. It allows reproducible densification, anisotropic grain growth and materials with high fracture toughness. |
| |
| Keywords: | |
| 本文献已被 ScienceDirect 等数据库收录！ |
|
