Microstructure and Mechanical Properties of ZrB2-Based UHTC via Reactive Hot Pressing

Abstract:

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ZrB2-based ultra-high temperature ceramics (UHTCs) were prepared from a mixture powder of Zr/B4C/Si with different ratio via reactive hot pressing. The experimental results showed that the sintering temperature above 1800°C was necessary for enhancing the activity of the powders and thus improving the densification of the product. The sinterability and densification properties of ZrB2-based UHTCs meliorated with the amount of Si increasing. However, many large ZrB2 agglomerates formed when the amount of synthesized SiC in the product reached 25vol%, which led to decrease the mechanical property. The composite had highest mechanical properties when the volume ratio of ZrB2: SiC: ZrC was 73.86:20:6.14, and its flexual strength and the fracture toughness were 645.8MPa and 5.66MPa·m1/2 respectively. The microstructure investigation showed the in-situ formed SiC and ZrC were located in the triple point of ZrB2 grains with a size less than 3μm.

Info:

Periodical:

Key Engineering Materials (Volumes 368-372)

Edited by:

Wei Pan and Jianghong Gong

Pages:

1737-1739

DOI:

10.4028/www.scientific.net/KEM.368-372.1737

Citation:

Q. Qu et al., "Microstructure and Mechanical Properties of ZrB2-Based UHTC via Reactive Hot Pressing", Key Engineering Materials, Vols. 368-372, pp. 1737-1739, 2008

Online since:

February 2008

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Price:

$35.00

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