Reactive Processing of Ceramic Composites at Moderate Temperatures

Rangaraj, L and Divakar, C and Jayaram, V (2009) Reactive Processing of Ceramic Composites at Moderate Temperatures. In: National Conference on Scientific Achievements of SC & ST Scientists and Technologists, 14-16 April 2009, Bangalore.

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    Abstract

    Dense TiN-TiB2 and ZrB2-ZrC composites were produced by using stoichiometric Ti-BN and Zr-B4C powder mixtures with 1 wt% Ni at 40 MPa, 1600°C for 30 min. Addition of excess Ti / /Zr powder to stoichiometric Ti-BN / /Zr-B4C powder mixtures yielded dense TiNx-TiB2 and ZrB2-ZrCx composites at 1200°C. The densification echanism in TiN-TiB2 composites attributed to the presence of transient Ti-Ni liquid phase for long time. However, in case of ZrB2-ZrC composites, plastic deformation of transient ZrCx grains during reactive hot pressing played a predominant role in densification without Ni. Further, ZrB2-ZrC-SiC composite were produced by using Zr-B4C-Si powder mixtures at 1600°C for 30 min. The relative density, hardness and fracture toughness of the composites are 99%, 20-–22 GPa and 5-–5.5 MPa.m1/2 respectively.

    Item Type: Conference or Workshop Item (Paper)
    Uncontrolled Keywords: Composites, Densification, Transient Liquid Phase, Plastic Deformation
    Subjects: CHEMISTRY AND MATERIALS > Composite Materials
    Division/Department: Materials Science Division, Materials Science Division, Other
    Depositing User: Ms Indrani V
    Date Deposited: 25 Jan 2012 10:32
    Last Modified: 25 Jan 2012 10:32
    URI: http://nal-ir.nal.res.in/id/eprint/10227

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