Thermal properties of polymer‐derived ceramic reinforced with boron nitride nanotubes. Issue 12 (8th July 2019)

• Record Type: Journal Article
• Authors: Jia, Yujun; Ajayi, Tosin D.; Morales, Justin; Chowdhury, Md Atiqur Rahman; Sauti, Godfrey; Chu, Sang‐Hyon; Park, Cheol; Xu, Chengying
• Is Part Of: Journal of the American Ceramic Society. Volume 102:Issue 12(2019)
• Page Start: 7584
• Page End: 7593
• Publication Date: 2019-07-08
• Subjects: boron nitride nanotubes -- polymer derived ceramic -- thermal conductivity; Ceramics -- Periodicals; 620.1405
• DOI: 10.1111/jace.16670
• Languages: English
• ISSNs: 0002-7820

Abstract

Abstract: We report the thermal properties of boron nitride nanotube (BNNT) reinforced ceramic composites using the polymer derived ceramic (PDC) processing route. The nano‐composites had a BNNT loading of up to 35.4 vol.%. TGA results showed that nano‐composites have good thermal stability up to 900°C in air. BNNTs in nano‐composites survived in an oxidizing environment up to 900°C, revealing that nano‐composites can be used for high temperature applications. Thermal conductivity of PDC reinforced with 35.4 vol.% BNNT was measured as 4.123 W/(m·K) at room temperature, which is a 2100 % increase compared to that of pristine PDC. The thermal conductivity value increases with the increase of BNNT content. A thermal conductivity percolation phenomenon appeared when the BNNT content increased to 36 ± 5 vol.%. The results of this study showed that BNNTs could effectively improve the thermal conductivity of PDC materials. BNNT reinforced PDC could be used as thermal structural materials in a harsh environment at temperatures up to 900°C. Abstract : BNNT‐PDC nano‐composites (35.4 vol.% BNNT) show a thermal conductivity of 4.123 W/(mK) at room temperature and have good thermal stability up to 900°C in air.