Synthesis, microstructure, and mechanical properties of boron suboxide materials doped with chromium boride

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Publication Details

Author list: Ogunmuyiwa EN, Johnson OT, Sigalas I

Publisher: Taylor and Francis Group

Place: PHILADELPHIA

Publication year: 2017

Journal: Materials and Manufacturing Processes (1042-6914)

Journal acronym: MATER MANUF PROCESS

Volume number: 32

Issue number: 1

Start page: 69

End page: 75

Number of pages: 7

ISSN: 1042-6914

eISSN: 1532-2475

Languages: English-Great Britain (EN-GB)

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Abstract

Improvement on the densification and fracture toughness of ceramic materials based on boron suboxide (B6O) has been of great importance. The mechanical properties of B6O with and without chromium boride addition, hot pressed at a temperature range of 1850-1900 degrees C and pressures of 50-80MPa for 20 minutes, were investigated. The relative density, phase relationship, microstructures and mechanical properties of the processed ceramics were examined. More than 96% of the theoretical density was obtained for both ceramic systems. A good combination of mechanical properties was obtained with the B6O-CrB2 material (H-V=32.1GPa, K-IC=4.5MPam(0.5)) compared to the pure B6O material (H-V=30.5GPa, K-IC=brittle). The addition of 1.7wt.% CrB2 resulted in a pronounced improvement in both the hardness and fracture toughness values. Crack bridging and deflection are some of the toughening mechanisms liable for the enhanced fracture toughness of the sintered ceramic materials.

Keywords

Boron suboxide, chromium boride, Fracture toughness, hot press

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