Low-temperature processing of ZrB2-ZrC composites by reactive hot pressing

Rangaraj, L and Suresha, SJ and Divakar, C and Jayaram, V (2008) Low-temperature processing of ZrB2-ZrC composites by reactive hot pressing. Metallurgical and Materials Transactions A, 39A (7). pp. 1496-1505. ISSN 1073-5623

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    Abstract

    Dense ZrB2-ZrC and ZrB2-ZrCx0.67 composites have been produced by reactive hot pressing13; (RHP) of stoichiometric and nonstoichiometric mixtures of Zr and B4C powders at 40 MPa and13; temperatures up to 1600 C for 30 minutes. The role of Ni addition on reaction kinetics and13; densification of the composites has been studied. Composites of 97 pct relative density (RD)13; have been produced with the stoichiometric mixture at 1600 C, while the composite with13; 99 pct RD has been obtained with excess Zr at 1200 C, suggesting the formation of carbon13; deficient ZrCx that significantly aids densification by plastic flow and vacancy diffusion mechanism.13; Stoichiometric and nonstoichiometric composites have a hardness of 20 GPa. The grain13; sizes of ZrB2 and ZrCx0.67 are 0.6 and 0.4 lm, respectively, which are finer than those13; reported in the literature.

    Item Type: Journal Article
    Additional Information: Copyright to this article belongs to M/s. Springer Boston
    Uncontrolled Keywords: Boron compounds;Stoichiometric ZrB2-ZrC composites;plastic flow
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
    Division/Department: Materials Science Division, Other, Materials Science Division, Other
    Depositing User: Ms. Alphones Mary
    Date Deposited: 27 May 2009
    Last Modified: 17 Jun 2010 15:10
    URI: http://nal-ir.nal.res.in/id/eprint/5124

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