Affiliation:
1. AGH-University of Science and Technology, Faculty of Materials Science and Ceramics, Krakow, Poland
Abstract
Titanium diboride (TiB2) is a typical material classified as structural
ceramics. However, sintering of TiB2 ceramics is difficult mainly because of
a significant fraction of covalent bonds in the structure. In order to
obtain dense TiB2 ceramics various additives are used to improve its
sinterability. In this study, we investigated effects of MoSi2 and CrSi2
additions on sintering and properties of TiB2 prepared by hot-pressing
technique. The sintered materials were characterized in terms of apparent
density and microstructure. Their mechanical properties (bending strength,
Vickers hardness and fracture toughness) and oxidation resistance were
determined. It was found that the obtained composites are characterized by
high density and microstructure characteristic for cermets (TiB2-MoSi2). The
activators used for sintering did not deteriorate mechanical properties of
TiB2 sintered bodies. The oxidation resistance of the polycrystals with
chromium silicide addition reaches 1400?C. Based on the carried-out
studies, CrSi2 was found to be a promising sintering additive.
Publisher
National Library of Serbia