Mechanical and Thermal Properties of SmMgAl11O19

作者：Min Xin; Fang Minghao^*; Huang Zhaohui; Liu Yangai; Jiang Bin; Hu Meiling

来源：Rare Metal Materials and Engineering, 2013, 42: 646-649.

• SmMgAl11O19 ceramic
• mechanical properties
• thermal properties

Samarium magnesium hexaaluminate (SmMgAl11O19) powders with a magnetoplumbite type structure were synthesized directly by solid-state reaction at 1550 degrees C for 5 h. The SEM images show that the prepared powders present hexagonal plates. And then SmMgAl11O19 ceramic was prepared by a two step sintering method at 1700 degrees C for 0.5 h and a relatively low sintering temperature of 1650 degrees C for 10 h. The bulk density and flexural strength of SmMgAl11O19 ceramic are 4.31 g/cm(3) and 189.2 +/- 30.6 MPa, respectively. Results also show that the thermal properties of the as-prepared SmMgAl11O19 ceramic prepared by two-step sintering are better than that of LaMgAl11O19 ceramics. The thermal conductivity and thermal diffusivity decrease with increasing temperature. At 1073 K, the thermal conductivity and thermal diffusivity of SmMgAl11O19 ceramic are 2.43 W/mK and 0.532 m(2)/s, respectively. And the linear thermal expansion coefficient from 200 to 1200 degrees C is 9.5x10(-6) K-1.

• 出版日期2013-6
• 单位中国地质大学（北京）; 北京科技大学