High‐Temperature Strength of Boron Suboxide Ceramic Consolidated by Spark Plasma Sintering |
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Authors: | Ievgen Solodkyi Oleg Vasylkiv |
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Affiliation: | 1. National Institute for Materials Science, Tsukuba, Ibaraki, Japan;2. Nanyang Technological University, Singapore |
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Abstract: | The spark plasma sintering (SPS) of B6O 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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Keywords: | spark plasma sintering boron suboxide high‐temperature strength |
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