Densification and mechanical properties of cBN-TiN-TiB2 composites prepared by spark plasma sintering of SiO2-coated cBN powder

Mettaya Kitiwan, Akihiko Ito, Jianfeng Zhang, Takashi Goto

研究成果: Article査読

22 被引用数 (Scopus)

抄録

cBN-TiN-TiB2 composites were fabricated by spark plasma sintering at 1773-1973K using cubic boron nitride (cBN) and SiO2-coated cBN (cBN(SiO2)) powders. The effect of SiO2 coating, cBN content and sintering temperature on the phase composition, densification and mechanical properties of the composites was investigated. SiO2 coating on cBN powder retarded the phase transformation of cBN in the composites up to 1873K and facilitated viscous sintering that promoted the densification of the composites. Sintering at 1873K, without the SiO2 coating, caused the relative density and Vickers hardness of the composite to linearly decrease from 96.2% to 79.8% and from 25.3 to 4.4GPa, respectively, whereas the cBN(SiO2)-TiN-TiB2 composites maintained high relative density (91.0-96.2%) and Vickers hardness (17.9-21.0GPa) up to 50vol% cBN. The cBN(SiO2)-TiN-TiB2 composites had high thermal conductivity (60Wm-1K-1 at room temperature) comparable to the TiN-TiB2 binary composite.

本文言語English
ページ(範囲)3619-3626
ページ数8
ジャーナルJournal of the European Ceramic Society
34
15
DOI
出版ステータスPublished - 2014 12

ASJC Scopus subject areas

  • セラミックおよび複合材料
  • 材料化学

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