Mechanical Properties and Ablation Behavior of Machinable ZrB2-SiC-BN Ceramics

Abstract:

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ZrB2-SiC-BN ultrahigh-temperature ceramic (UHTC) was fabricated by hot-pressing at 1800°C under 23MPa pressure of argon. Compared to ZrB2-SiC, the flexural strength of ZrB2-SiC-BN composite material was enhanced by adding 30% BN, and the fracture toughness showed a slight decrease, while the hardness decreased sharply. The addition of 30% BN also noticeably improved the machinability of the composites. Furthermore, ablation resistance tests were carried out using an oxyacetylene torch under subsonic conditions. Results indicated that a coherent compact scale of zirconium silicate was formed, which acted as an effective barrier against the inward diffusion of oxygen.

Info:

Periodical:

Advanced Materials Research (Volumes 79-82)

Edited by:

Yansheng Yin and Xin Wang

Pages:

2011-2014

DOI:

10.4028/www.scientific.net/AMR.79-82.2011

Citation:

H. T. Wu and W. G. Zhang, "Mechanical Properties and Ablation Behavior of Machinable ZrB2-SiC-BN Ceramics", Advanced Materials Research, Vols. 79-82, pp. 2011-2014, 2009

Online since:

August 2009

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Price:

$35.00

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