1. Physical and mechanical properties of hexagonal boron nitride ceramic fabricated by pressureless sintering without additive
- Author
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T. Qiu, T. B. Wang, J. Yang, C. C. Jin, and Chunfeng Hu
- Subjects
Thermal shock ,Materials science ,Sintering ,Industrial and Manufacturing Engineering ,chemistry.chemical_compound ,Thermal conductivity ,Flexural strength ,chemistry ,Boron nitride ,visual_art ,Phase (matter) ,Ceramics and Composites ,visual_art.visual_art_medium ,Grain boundary ,Ceramic ,Composite material - Abstract
Hexagonal boron nitride hBN ceramic was successfully fabricated by pressureless sintering at 2100C using submicrometre hBN powders without any sintering additive. The as-prepared hBN ceramic showed a room temperature flexural strength of 30.7MPa. Its flexural strength increased with the increment of temperature in N2 atmosphere, and it retained a strength of 57.2MPa nearly two times of the room temperature strength at 1600C due to clean grain boundaries with no glassy phase. Additionally, the as-prepared hBN ceramic showed a high thermal conductivity of 31.76Wm1k1 and a good thermal shock resistance, which retained a relatively high residual flexural strength of 22.6MPa 73.5 of the original flexural strength at T800C. The as-prepared hBN ceramic presents a good application prospect at high temperature.
- Published
- 2014
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