کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1647717 1007544 2012 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Grain size dependence of pure β-eucryptite thermal expansion coefficient
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد فناوری نانو (نانو تکنولوژی)
پیش نمایش صفحه اول مقاله
Grain size dependence of pure β-eucryptite thermal expansion coefficient
چکیده انگلیسی

The impact of the grain size, in the range of about ~ 3–12 μm, on spontaneous microcracking and therefore on the value of the bulk β-eucryptite negative thermal expansion coefficient (TEC) has been carefully investigated. In order to control the grain size, pure β-eucryptite powders were synthesized, slip-casted and sintered in air at 1300 °C for 0, 6 and 24 h. The results show that only a slight variation of the intrinsic β-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 β-eucryptite TEC.


► We study the effect of the grain size on the microcracking of pure β-eucryptite.
► Large negative TECs of pure β-eucryptite are mainly related to the microcracking.
► We show for the first time the dependence of β-eucryptite TEC with the grain size.
► Misconception of supposing β-eucryptite as a highly NTE material is cleared.
► An empirical linear relationship between TECs and the mean grain size was proposed.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Letters - Volume 66, Issue 1, 1 January 2012, Pages 68–71
نویسندگان
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