Processing and Characterization of CrB2-Based Novel Composites

This paper presents the results of investigations carried out on processing and characterization of CrB 2 -based novel composites. Niobium metal powder was used as additive to form new composites. Hardness and fracture toughness of chromium boride increased by addition of niobium. CrB 2 composites were prepared by addition of 2.5, 10 and 20 wt.% Nb. Density of higher than 95% ρ th was achieved in all the samples. Hot pressed samples were analyzed to contain reaction products of NbB 2 , Cr 2 B 3 and Cr 3 B 4 phases along with CrB 2 . Hardness of CrB 2 composite was increased from 18.46 GPa to 21.89 GPa by increasing the Nb content from 2.5 to 10 wt.%. Fracture toughness of composites prepared by addition of 2.5 and 10% was measured as 3.11 and 3.38 MPa.m 1/2 respectively. Addition of 20% Nb resulted in increased fracture toughness of 4.32 MPa.m 1/2 .

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