Investigation on synthesis, pressureless sintering and hot pressing of chromium diboride
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Abstract
Abstract Experimental investigations were carried out on synthesis of chromium diboride through boron carbide reduction of Cr2O3. The products obtained were characterized by X-ray diffraction and the process optimized to prepare single-phase CrB2 powder. Densification of CrB2 was investigated by pressureless sintering and hot pressing. A maximum of 93% ρth was obtained by pressureless sintering at 1850 °C after a prolonged duration of 360 min. However, near theoretical density was achieved by hot pressing at 1600 °C and 35 MPa pressure for 2 h. The hardness and fracture toughness of fully dense CrB2 was measured as 22 GPa and 3.5 MPa m1/2, respectively. The mode of fracture in pressureless sintered samples is intergranular whereas that in hot pressed is transgranular.
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