Reactive hot pressing of titanium nitride-titanium diboride composites at moderate pressures and temperatures

Rangaraj, L and Divakar, C and Jayaram, V (2004) Reactive hot pressing of titanium nitride-titanium diboride composites at moderate pressures and temperatures. Journal of the American Ceramic Society, 87 (10). pp. 1872-1878. ISSN 0002-7820

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Abstract

Dense composites in the Ti-B-N system have been produced by reactive hot pressing of titanium and BN powders. The effect of the addition of a small amount of nickel (1-3 wt%) on the reaction kinetics and densification of TiN-TiB2 (40 vol %) composite has been studied. Composites of 99% of theoretical density have been produced at 1600DGC under 40 MPa for 30 min with 1% nickel. The hardness and fracture toughness of these composites are 24.5 +/- 0.97 GPa and 6.53 +/- 0.27 MPa (sq rt m), respectively. The microstructural studies on samples produced at lower temperatures indicate the formation of a transient liquid phase, which enhances the kinetics of the reaction and densification of the composite.

Item Type: Article
Additional Information: Copyright for this article belongs to American Ceramic Society
Uncontrolled Keywords: Titanium nitride;Titanium diboride;Ceramic matrix composites;Reaction kinetics;Hot pressing;Densification; Hardness;Fracture toughness;Ceramic powders;Liquid phases;Theoretical density;Morphology;Particulate composites
Subjects: CHEMISTRY AND MATERIALS > Inorganic, Organic and Physical Chemistry
CHEMISTRY AND MATERIALS > Composite Materials
Depositing User: Mrs Manoranjitha M D
Date Deposited: 12 Sep 2006
Last Modified: 24 May 2010 04:20
URI: http://nal-ir.nal.res.in/id/eprint/2706

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