Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
831958 | Materials & Design (1980-2015) | 2010 | 5 Pages |
This paper deals with the influence of dysprosium oxide doping on thermophysical properties of LaMgAl11O19 ceramics. LaMgAl11O19 ceramic powders doped with different contents of dysprosium oxide were pressureless-sintered at 1700 °C for 10 h in air to fabricate dense bulk ceramics. La1−xDyxMgAl11O19 (x = 0, 0.1, 0.2, 0.3) ceramics have a relative density of 90.7–96.0%, and exhibit a single phase of magnetoplumbite structure. Thermal diffusivity and thermal expansion coefficients of La1−xDyxMgAl11O19 ceramics were measured with a laser flash method and a high-temperature dilatometer. Thermal diffusivity of La1−xDyxMgAl11O19 ceramics decreases with increasing Dy2O3 content at identical temperature levels. The measured thermal conductivity of La1−xDyxMgAl11O19 ceramics is located in the range of 2.52–2.89 W m−1 K−1 at 1200 °C. Thermal expansion coefficient of La0.8Dy0.2MgAl11O19 ceramic is slightly higher than that of undoped LaMgAl11O19 ceramic at identical temperature levels.