Formation of secondary borides in liquid phase-sintered B₆O materials

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• 作者：Maik Thiele^a ; ^{maik.thiele@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Mathias Herrmann^b ; ^{Mathias.Herrmann@ikts.fraunhofer.de" class="auth_mail" title="E-mail the corresponding author} ; Christin Mü ; ller^a ; Alexander Michaelis^a
• 关键词：Boron suboxide ; Sintering ; Microstructure ; Properties
• 刊名：Journal of the European Ceramic Society
• 出版年：2016
• 出版时间：June 2016
• 年：2016
• 卷：36
• 期：7
• 页码：1549-1557
• 全文大小：1460 K

文摘

Liquid phase-sintered B₆O materials with Al₂O₃/Y₂O₃ additives were recently developed to yield higher fracture toughness and strength levels than those of pure B₆O-materials. However, the high additive contents of hot-pressed and spark plasma-sintered (FAST/SPS) materials led to the formation of strength-limiting boride precipitates. Systematic variation of the B₂O₃ content of the grain boundary phase and thermodynamic calculations carried out in the present work showed that it is possible to avoid boride formation by controlling the decomposition of B₂O₃ during densification and adjusting the B₂O₃ content of the composition through direct addition of B₂O₃ or through reaction of added transition metal oxides such as TiO₂ with the starting composition to form B₂O₃.