Processing and properties of monolithic TiB₂ based materials

Authors: Basu, B.; Raju, G. B.; Suri, A. K.

Source: International Materials Reviews, Volume 51, Number 6, December 2006 , pp. 352-374(23)

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Abstract:

Titanium diboride (TiB₂) based materials have received wide attention because of their high hardness and elastic modulus, good abrasion resistance, and superior thermal and electrical conductivity. Potential applications include high temperature structural materials, cutting tools, armour, electrodes in metal smelting and wear parts. Despite its useful properties, the application of monolithic TiB₂ is limited by poor sinterability, exaggerated grain growth at high temperature and poor oxidation resistance above 1000°C. Pure TiB₂ can be densified only at high temperatures (∼2000°C), with an applied pressure generally being necessary during sintering. However, these high sintering temperatures cause abnormal grain growth and microcracks, which are detrimental to the mechanical properties. Various sinter additives are commonly added to obtain dense TiB₂ with optimised mechanical properties at lower sintering temperature. The present review surveys the current state of knowledge on development of bulk TiB₂ based materials, with particular emphasis on consolidation microstructure property relationships. Three major issues are addressed: the preparation of bulk titanium boride with metallic and non-metallic sinter additives (up to 20 wt-%), tribological properties and thermal stability of the borides. In conclusion, a perspective for future development of boride materials is provided.

Keywords: MICROSTRUCTURE; OXIDATION; TIB2; MECHANICAL PROPERTIES; TRIBOLOGY; SINTERING

Document Type: Research Article

DOI: http://dx.doi.org/10.1179/174328006X102529

Publication date: 2006-12-01

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The archive of International Materials Reviews has three previous titles. The full archive is available online, and each title has a separate page of volumes. Please see Metallurgical Reviews , for volumes 1-16, International Metallurgical Reviews for volumes 17-20 and International Metals Reviews for volumes 21-31
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