Nearly dense cordierite bonded silicon carbide ceramics prepared by hot pressing sintering at 1650°C

Cordierite bonded silicon carbide ceramics with different cordierite content were prepared by hot pressing sintering at 1650 °C. The samples with more than 30 wt% cordierite were nearly dense with relative densities greater than 99%. Cordierite existed in amorphous form, and was closely bound to SiC...

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Bibliographic Details
Published in:Ceramics international 2023-10, Vol.49 (19), p.32313-32317
Main Authors: Zhu, Ming, Chen, Jian, Liu, Huan, Zhang, Hui-hui, Li, Fan-fan, Huang, Chang-cong, Liu, Xue-jian, Huang, Zheng-ren
Format: Article
Language:English
Subjects:
Hot-pressing sintering
Infrared radiation performance
Low sintering temperature
Mechanical properties
SiC-MAS composites
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Summary:Cordierite bonded silicon carbide ceramics with different cordierite content were prepared by hot pressing sintering at 1650 °C. The samples with more than 30 wt% cordierite were nearly dense with relative densities greater than 99%. Cordierite existed in amorphous form, and was closely bound to SiC grains without transition layer, which resulted in the excellent mechanical properties of the composites. The sample with 30 wt% cordierite showed the best mechanical properties, with flexural strength of 411.44 ± 27.63 MPa, fracture toughness of 5.01 ± 0.54 MPa m1/2 and Vickers hardness of 12.02 ± 0.25 GPa, respectively. In addition, cordierite could effectively improve the infrared radiation performance of SiC ceramics, that the total emissivity of the sample with 40 wt% cordierite was 0.726, which was 16.5% higher than pure SiC ceramics.
ISSN:0272-8842
1873-3956
DOI:10.1016/j.ceramint.2023.07.069