Densification and properties of superhard B₆O materials with cobalt additions

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• 作者：O.T. Johnson^a ; ^{Oluwagbenga.johnson@wits.ac.za} ; ^{johnson.gbenga@gmail.com} ; I. Sigalas^a ; M. Herrmann^b ; H.J. Kleebe^c
• 关键词：Boron suboxide (B6O) ; Microstructure- final ; Sintering ; Mechanical properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2012
• 期刊代码：53_09552219
• 类别：ms
• 出版时间：August, 2012
• 卷：32
• 期：10
• 页码：2573-2579
• 文件大小：1872 K

摘要

The search for suitable additives for boron suboxide (B₆O) materials which could improve densification, reduce sintering temperature and tailor the microstructure has been productive. B₆O materials doped with 0-5 vol%cobalt addition were sintered at temperatures up to 1850 掳C and pressure of 50 MPa for 20 min. Relationships between the formed phases, microstructures and mechanical properties of the sintered materials were investigated as a function of sintering conditions and added cobalt content. The hardness of the sintered B₆O materials increases with sintering temperature, while the fracture toughness increases with increasing cobalt content and reduces with increasing sintering temperature.