کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7853527 | 1508870 | 2014 | 41 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Thermal and electrical conduction in the compaction direction of exfoliated graphite and their relation to the structure
ترجمه فارسی عنوان
هدایت حرارتی و الکتریکی در جهت تراکم گرافیت پوشیده شده و ارتباط آن با ساختار
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی انرژی
انرژی (عمومی)
چکیده انگلیسی
The effects of the compaction and graphite layer preferred orientation on the thermal and electrical conductions in the compaction direction of graphite-flake-based exfoliated graphite have been decoupled. The compact's electrical and thermal conductivities decrease with increasing compaction (density increasing from 0.047 to 0.67 g/cm3, solid content increasing from 2.1 to 30 vol.%) and preferred orientation. The essentially linear correlation between electrical and thermal conductivities (Wiedemann-Franz Law) is because both conductions are governed by the preferred orientation. With increasing compaction, the fraction (f) of conduction path that is the graphite a-axis decreases from 0.997 to 0.937 and from 0.994 to 0.798 for thermal and electrical conductions respectively. For the solid-part thermal and electrical conductivities to exceed 140 W/(m K) and 60 kS/m respectively, f must exceed 0.95; the highest solid-part conductivities are 550 W/(m K) and 230 kS/m. The compaction-related variation in the solid-part conductivities is large [21-550 W/(m K) and 10-230 kS/m], due to the preferred orientation variation. The through-thickness Lorentz number (7.3 Ã 10â6 W Ω/K2) is similar to the in-plane value, being independent of the preferred orientation. At 2-7 vol.% solid, conductivities of 7 W/(m K) and 3 kS/m are obtained for the compact - toward the targets for fuel cell biopolar plates.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Carbon - Volume 77, October 2014, Pages 538-550
Journal: Carbon - Volume 77, October 2014, Pages 538-550
نویسندگان
Po-Hsiu Chen, D.D.L. Chung,