Preparation and mechanical properties of laminated zirconium diboride/molybdenum composites sintered by spark plasma sintering

Hai-long WANG, Chang-an WANG

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PDF(418 KB)
Front. Mater. Sci. ›› 2009, Vol. 3 ›› Issue (3) : 273-280. DOI: 10.1007/s11706-009-0050-z
RESEARCH ARTICLE

Preparation and mechanical properties of laminated zirconium diboride/molybdenum composites sintered by spark plasma sintering

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Abstract

Laminated ZrB2/Mo composites, alternately consisting of matrix layers of 80 vol.% ZrB2 +10 vol.% nano-SiC whiskers +10 vol.% SiC particles and Mo interlayers, with the addition of Si and B as interlayer adjusting agent, were prepared by roll-compaction and spark plasma sintering (at 1600°C) process. XRD and SEM techniques were used to characterize the phases and microstructure of the obtained composites. The results showed that without the addition of Si and B in the interlayer, interfacial debonding between the matrix layer and interlayer often occurred due to the thermal mismatch between the two kinds of layers. However, the interfacial mismatch could be effectively inhibited by the addition of Si and B to the Mo interlayers. The laminated ZrB2/Mo composites with 6 at.% Si and 4 at.% B in the interlayers showed the highest bending strength at (451±20) MPa and the highest fracture toughness at (7.52±0.12) MPa∙m1/ 2. MoB, ZrB and Mo5SiB2 were formed by the reactions among ZrB2, Mo and the additions.

Keywords

zirconium diboride(ZrB2) / ceramics matrix composites / laminated / spark plasma sintering(SPS)

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Hai-long WANG, Chang-an WANG. Preparation and mechanical properties of laminated zirconium diboride/molybdenum composites sintered by spark plasma sintering. Front Mater Sci Chin, 2009, 3(3): 273‒280 https://doi.org/10.1007/s11706-009-0050-z

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Acknowledgements

This work was supported by the 973 Program of MOST (Grant No. 5133102-4). The authors would like to thank the Institution of Composites, Harbin Institute of Technology for its support.

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg
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