Influence of Yb3+ doping on phase stability and thermophysical properties of (Y1-xYbx)3Al5O12 under high temperature |
| |
Affiliation: | 1. School of Materials Science and Engineering, Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;2. Key Laboratory of Aerospace Materials & Performance (Ministry of Education), Beihang University, No. 37 Xueyuan Road, Beijing 100191, China;1. School of Materials Science and Engineering, Changwon National University, Changwon, Gyeongman, 641-773, Republic of Korea;2. Department of Energy Engineering, Hanyang University, Seoul 133-791, Republic of Korea;3. High Temperature Materials Research Group, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam 641-831, Republic of Korea;4. Department of Mechanical Engineering, Indiana University-Purdue University Indianapolis, Indianapolis, IN 46202, USA |
| |
Abstract: | In this work, Yb3+ was selected to replace the Y3+ in yttrium aluminum garnet (YAG) in order to reduce its thermal conductivity under high temperature. A series of (Y1-xYbx)3Al5O12 (x=0, 0.1, 0.2, 0.3, 0.4) ceramics were prepared by solid-state reaction at 1600 °C for 10 h. The microstructure, thermophysical properties and phase stability under high temperature were investigated. The results showed that all the Yb doped (Y1-xYbx)3Al5O12 ceramics were comprised of a single garnet-type Y3Al5O12 phase. The thermal conductivities of (Y1-xYbx)3Al5O12 ceramics firstly decreased and subsequently increased with Yb ions concentration rising from room temperature to 1200 °C. (Y0.7Yb0.3)3Al5O12 had the lowest thermal conductivity among investigated specimens, which was about 1.62 W m−1 K−1 at 1000 °C, around 30% lower than that of pure YAG (2.3 W m−1 K−1, 1000 °C). Yb had almost no effect on the coefficients of thermal expansion (CTEs) of (Y1-xYbx)3Al5O12 ceramics and the CTE was approximate 10.7×10−6 K−1 at 1200 °C. In addition, (Y0.7Yb0.3)3Al5O12 ceramic remained good phase stability when heating from room temperature to 1450 °C. |
| |
Keywords: | Yttrium aluminum garnet Yb doping Thermal conductivity Phase stability |
本文献已被 ScienceDirect 等数据库收录! |
|