Effect of Microstructure on Mechanical Properties and Erosive Wear of B4C and B4C-CrB2 Composites.
Year: 2003
Type: article
Abstract: Monolithic B4C and B4C-20 mol% CrB2 composite ceramics were fabricated by hot pressing at 1900 and 2050°C. Erosive wear by Al2O3 particle impingement was tested using a sandblaster. The microstructure, mechanical properties and erosive wear of the ceramic specimens were examined and compared with those of a commercial B4C ceramic. Monolithic B4C and B4C-CrB2 composite specimens exhibited the high flexural strength of more than 600 MPa, which was attributed to their fine grained and uniform microstructure. Furthermore, a low erosive wear rate was obtained for these specimens compared with a commercial B4C ceramic. In particular, the fracture toughness of the composite specimen hot-pressed at 1900°C was improved from 2.48 to 3.50 MPa·m1/2 by the addition of CrB2, and exhibited the highest resistance to erosion. Erosive wear occurred by the removal of the B4C particles. The experimental results could be described by the equation V∝dE/KC2, as theoretically proposed by Ritter.
Language: English
Subfield: Ceramics and Composites
Field: Materials Science
Domain: Physical Sciences
Open Access status: diamond
OpenAlex ID: W2047260397