ISSN:
1013-9826
Source:
Scientific.Net: Materials Science & Technology / Trans Tech Publications Archiv 1984-2008
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
Notes:
In view of potentiality of titanium diboride (TiB2) materials for high temperature applications, thispaper presents the state of art on the processing, microstructure and properties of TiB2 ceramics.TiB2 ceramics are of interest for applications such as cutting tools, wear resistant parts, armormaterial and electrode materials in metal smelting because of their excellent combination ofproperties including high hardness, elastic modulus, better strength to weight ratio, wear resistance,good thermal and electrical conductivity. However, such broader applications of the monolithicTiB2 are inhibited by factors like high sintering temperature and poor toughness. Hence, researchefforts are directed towards processing TiB2 at lower sintering temperature as well as to enhance theproperties with the use of various metallic and non-metallic sinter-additives. In the aboveperspective, we review the existing literature in this article. In addition, our recent research resultsobtained with TiB2-TiSi2 materials are also presented. A review of research results revealed that acombination of room temperature properties, i.e. maximum Vickers hardness of 31 GPa andindentation toughness of 11 MPa m1/2 and flexural strength of 810 MPa is obtainable with optimallysintered TiB2. More importantly, a maximum hardness of 9 GPa (at 900oC) and flexural strength of471 MPa can be retained upto 1200oC. From the perspective of oxidation resistance, TiB2 samplesexhibit parabolic oxidation kinetics below 1000oC as result of the formation of TiO2 (s), and B2O3(l) and linear oxidation kinetics above 1000oC in the presence of crystalline TiO2 and volatile B2O3
Type of Medium:
Electronic Resource
URL:
http://www.tib-hannover.de/fulltexts/2011/0528/01/57/transtech_doi~10.4028%252Fwww.scientific.net%252FKEM.395.89.pdf
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