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Densification of ZrCx-ZrB2 Composites by Reactive Hot Pressing at Low Applied Pressure

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Abstract

Dense ZrCx-ZrB2 (10 to 50 vol pct) composites were produced by reactive hot pressing (RHP) of different molar ratios Zr, C, and B powder mixtures at 4 to 7 MPa, 1200 °C for 60 minutes. An applied pressure of 4 MPa was found to be sufficient to produce ZrCx-ZrB2 (10 to 20 vol pct) composites with 96 to 97 pct relative density (RD). However, to achieve similar RD with a higher volume of ZrB2 (≤ 50 vol pct), 7 MPa was required. RHP of the 1.83Zr-0.5C-1.66B powder mixture (50 vol pct ZrB2) at 600 °C to 1200 °C for 5 minutes illustrated sluggishness of the reaction; the plasticity of Zr played a significant role in densification. Microhardness, indention fracture toughness, and three-point flexural strength of the ZrCx-ZrB2 (50 vol pct) composites are 14.7 ± 0.5 GPa, 5.5 ± 0.69 MPa√m, and 609 ± 38 MPa, respectively. Improvement in the mechanical properties of the composites is believed to be in distribution of ZrB2 platelets within the ZrCx matrix.

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Acknowledgments

The authors acknowledge the financial support received from the Science and Engineering Research Board, Department of Science and Technology (Project Sanction No. SB/EMEQ-313/2013, dated August 27, 2013), New Delhi, Government of India. The authors thank Dr. S.K. Bhaumik, Head, MSD-NAL, for fruitful discussions during preparation of the manuscript. The authors are thankful to Dr. Anjana Jain, MSD-NAL, for recording XRD patterns; Mr. M. Mahesh, STTD-NAL, for flexural strength measurement; Messrs. Siju and N.T. Manikandanath, SED-NAL, for FE-SEM and Micro-Raman Spectroscopy; and Dr. Padaikathan, Department of Materials Engineering, Indian Institute of Science, Bangalore, for DTA.

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Authors and Affiliations

  1. Materials Science Division, CSIR-National Aerospace Laboratories, Bengaluru, 560017, India

    Rajaguru Kannan & Lingappa Rangaraj

  2. Academy of Scientific and Innovative Research, CSIR-NAL Campus, Bengaluru, 560017, India

    Rajaguru Kannan & Lingappa Rangaraj

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  1. Rajaguru Kannan
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Correspondence to Lingappa Rangaraj.

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Manuscript submitted October 13, 2017.

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Kannan, R., Rangaraj, L. Densification of ZrCx-ZrB2 Composites by Reactive Hot Pressing at Low Applied Pressure. Metall Mater Trans A 49, 3539–3549 (2018). https://doi.org/10.1007/s11661-018-4647-7

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