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High‐Temperature Strength of Boron Suboxide Ceramic Consolidated by Spark Plasma Sintering
Author(s) -
Demirskyi Dmytro,
Solodkyi Ievgen,
Sakka Yoshio,
Vasylkiv Oleg
Publication year - 2016
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.14308
Subject(s) - materials science , boron carbide , spark plasma sintering , suboxide , ceramic , microstructure , boron , flexural strength , brittleness , composite material , metallurgy , sintering , intergranular corrosion , oxide , chemistry , organic chemistry
The spark plasma sintering ( SPS ) of B 6 O ceramics using a highly crystalline boron suboxide powder with a low oxygen deficiency level is reported. The monolithic boron suboxide ceramic exhibited a room‐temperature strength of 300 ± 20 MPa, which is comparable to the strength of monolithic boron carbide. With increasing flexural test temperature, the strength of the boron suboxide ceramics increased to 450 MPa at 1400°C. The increase in strength with the temperature is associated with the unique microstructure of boron suboxide grains, which allows intergranular “brittle” fracture along subgrains even at 1400°C. This suggests that even higher strengths can be achieved.
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