当前位置: X-MOL 学术J. Eur. Ceram. Soc. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Ultra-low wear B4C-SiC-MoB2 composites fabricated at lower temperature from B4C with MoSi2 additives
Journal of the European Ceramic Society ( IF 5.8 ) Pub Date : 2021-09-09 , DOI: 10.1016/j.jeurceramsoc.2021.09.014
Victor Zamora 1 , Cristina Ojalvo 1 , Fernando Guiberteau 1 , Oscar Borrero-López 1 , Angel L. Ortiz 1
Affiliation  

Seeking to fabricate B4C composites that are even more superhard (>30 GPa) at lower cost, B4C was transient liquid-phase assisted spark-plasma-sintered, somewhat counterintuitively, at lower temperature (<1750 °C) and with greater MoSi2 aid content (>15 vol.%) than ever before. It was found that just 20 vol.% MoSi2 aid enables the full densification of B4C at 1700 °C, thereby avoiding the deleterious transformation β-MoB2→α-MoB2, having consumed the entire MoSi2 to form MoB2 and SiC. This maximizes the hardness (∼33 GPa) of these novel triplex-particulate B4C-SiC-MoB2 composites without penalizing their toughness (∼4.1 MPa⋅m0.5). Also importantly, the dry sliding-wear of these novel composites was investigated for the first time, showing that they undergo only mild wear (specific wear rate of ∼10−8 mm³/(N⋅m)) by plasticity-dominated two-body abrasion. Moreover, it was demonstrated that they are much more wear resistant than porous B4C monolithics fabricated under both the same and more demanding conditions, and at least as equally wear resistant as fully-dense B4C monolithics and composites fabricated under more demanding conditions.



中文翻译:

超低磨损 B4C-SiC-MoB2 复合材料由 B4C 和 MoSi2 添加剂在较低温度下制造

为了以更低的成本制造更超硬 (>30 GPa) 的B 4 C 复合材料,B 4 C 是瞬态液相辅助火花等离子体烧结,有点违反直觉,在较低温度 (<1750 °C) 和比以往更高的 MoSi 2助剂含量 (>15 vol.%)。发现仅 20 vol.% MoSi 2助剂就能够在 1700 °C 下完全致密化 B 4 C,从而避免有害转变 β-MoB 2 →α-MoB 2,消耗了整个 MoSi 2以形成 MoB 2和碳化硅。这最大限度地提高了这些新型三重颗粒 B 4 C-SiC-MoB 2的硬度 (~33 GPa)复合材料而不损害其韧性(~4.1 MPa⋅m 0.5)。同样重要的是,首次研究了这些新型复合材料的干滑动磨损,表明它们仅经历了由塑性主导的双体结构造成的轻度磨损(比磨损率为 ~10 -8 mm³/(N⋅m))。磨损。此外,已证明它们比在相同和更苛刻条件下制造的多孔 B 4 C 整体材料耐磨得多,并且至少与在更苛刻条件下制造的全致密 B 4 C 整体材料和复合材料一样耐磨.

更新日期:2021-10-19
down
wechat
bug