Synthesis and sintering of TiB2 and TiB2x2013;TiC composite under high pressure

Bhaumik, SK and Divakar, C and Singh, AK and Upadhyaya, GS (2000) Synthesis and sintering of TiB2 and TiB2x2013;TiC composite under high pressure. Materials Science and Engineering A, 279 (1-2). pp. 275-281.

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Abstract

TiB2 and TiB2x2013;TiC composite compacts with 98x2013;99% density are prepared by high-pressure sintering (HPS) of premixed powders and by high-pressure self-combustion synthesis (HPCS) from the elemental constituents. The sintering and synthesis experiments are carried out at 3 GPa in the temperature and time ranges 2250x2013;2750 K and 5x2013;300 s, respectively. A high sintering temperature (2750 K) is required to obtain dense monolithic TiB2 compacts (98% density) by HPS. Compacts with a similar density are obtained at lower sintering temperature (2250 K) when 15 mol% TiC is added to TiB2. The composite compacts have marginally better fracture toughness than that of monolithic compacts. TiB2 and TiB2x2013;TiC compacts (99% density) are also prepared by HPCS from elemental constituents. A minimum ignition temperature of 2250 K is required to make the reaction self-sustaining.The compacts prepared by HPCS have superior fracture toughness to those prepared by HPS. The microstructures and the properties of the compacts prepared by HPS and HPCS are compared. A possible sequence of reaction during the HPCS of TiB2x2013;TiC is proposed.

Item Type:	Article
Additional Information:	Copyright belongs to Elsevier Science Ltd.,
Uncontrolled Keywords:	Synthesis;Sintering;Titanium diboride;Titanium carbide; Composite;Ceramics
Subjects:	CHEMISTRY AND MATERIALS > Composite Materials CHEMISTRY AND MATERIALS > Chemistry and Materials (General)
Depositing User:	Mr. N A
Date Deposited:	09 Jun 2006
Last Modified:	03 May 2012 10:39
URI:	http://nal-ir.nal.res.in/id/eprint/1484

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