Grain size dependence of pure beta-eucryptite thermal expansion coefficient

作者：Pelletant A; Reveron H^*; Chevalier J; Fantozzi G; Blanchard L; Guinot F; Falzon F

来源：Materials Letters, 2012, 66(1): 68-71.

DOI：10.1016/j.matlet.2011.07.107

• Ceramics
• beta-Eucryptite
• Thermal properties
• Negative thermal expansion
• Microcracking

The impact of the grain size, in the range of about similar to 3-12 mu m, on spontaneous microcracking and therefore on the value of the bulk beta-eucryptite negative thermal expansion coefficient (TEC) has been carefully investigated. In order to control the grain size, pure beta-eucryptite powders were synthesized, slip-casted and sintered in air at 1300 degrees C for 0,6 and 24 h. The results show that only a slight variation of the intrinsic beta-eucryptite TEC is obtained after sintering. On the contrary, the larger the grain size the more important the microcracking phenomenon, leading to a significant and progressive decrease of the bulk beta-eucryptite TEC.

• 出版日期2012-1