Densification, Microstructure and Mechanical Properties of Reactive Hot-Pressed ZrB<sub>2</sub>-ZrC-Zr Cermets
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- GUO Shuqi
- Structural Non-oxide Ceramic Group, Research Center for Structural Materials, National Institute for Materials Science
Bibliographic Information
- Other Title
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- Densification, Microstructure and Mechanical Properties of Reactive Hot-Pressed ZrB₂-ZrC-Zr Cermets
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Abstract
<p>This study reviews densification behavior, microstructure and mechanical properties of the various composition ZrB2-ZrC0.6-Zr cermets prepared by reactive hot-pressing of Zr + B4C powder mixtures between 1673 K and 2173 K. During reactive sintering, densification consisted of two parts, one resulted from the volume contraction due to the conversion of Zr + B4C mixture into ZrB2 and ZrC0.6, other resulted from the shrinkage due to grain boundary diffusion and grain boundary migration that mostly contributed to the densification. Highly-dense ZrB2-ZrC0.6-Zr cermets were obtained for Zr + B4C mixtures at equal to or greater than 1673 K. The resulting ZrB2-ZrC0.6-Zr cermets consisted of platelet-like ZrB2 grains, equiaxed ZrC0.6 grains and intergranular Zr. The ZrB2 and ZrC0.6 grains were coarsened with increase of the excess Zr amount and/or sintering temperature. On the other hand, the flexural strength and fracture toughness of the cermets strongly depended on the excess Zr amount and/or sintering temperature. In addition, the crack propagation behavior of the cermets was associated with the excess Zr amount. The cracks directly propagated in the samples with less than 16 vol% Zr, however, the multiple cracking behavior was observed for the samples with equal to or greater than 16 vol% Zr.</p>
Journal
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- Journal of the Japan Society of Powder and Powder Metallurgy
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Journal of the Japan Society of Powder and Powder Metallurgy 64 (8), 445-452, 2017
Japan Society of Powder and Powder Metallurgy
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Details 詳細情報について
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- CRID
- 1390282681286859392
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- NII Article ID
- 130006031927
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- NII Book ID
- AN00222724
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- ISSN
- 18809014
- 05328799
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- NDL BIB ID
- 028467928
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- Text Lang
- ja
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed