High-temperature reactive spark plasma consolidation of TiB2-NbC ceramic composites
High-temperature reactive spark plasma consolidation of TiB2-NbC ceramic composites
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DOI：
10.1016/j.ceramint.2015.05.022
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发表时间：
2015-11-01
影响因子：
5.2
通讯作者：
Vasylkiv, Oleg
中科院分区：
文献类型：
--
作者：
Demirskyi, Dmytro;Sakka, Yoshio;Vasylkiv, Oleg
采用反应放电等离子烧结（SPS）技术对TiB 2-NbC陶瓷系统进行了烧结。研究了SPS固结TiB 2-NbC坯体的致密化、相关系、显微组织演变及其对性能的影响。NbC的加入增强了TiB 2的致密化，其中10 wt% NbC是最有效的。在2000摄氏度下NbC-TiB 2系统反应驱动固结期间形成的相是（Nb，Ti）碳化物和（Ti，Nb）二硼化物固溶体以及1-2 μ m TiB 2颗粒。硬度（24 GPa）和断裂韧性（6.8 MPa m（-2））之间的最佳平衡发现于在2000摄氏度下固结5分钟的30重量% NbC-TiB 2复合材料中。All rights reserved.
The TiB2-NbC ceramic system was consolidated by reactive spark plasma sintering (SPS). Densification, phase relations, microstructure evolution, and their effect on the properties of SPS-consolidated TiB2-NbC bodies were examined. The densification of TiB2 was enhanced by the addition of NbC, with 10 wt% NbC being the most effective. The phases that developed during reaction-driven consolidation of the NbC-TiB2 system at 2000 degrees C were (Nb,Ti) carbide and (Ti,Nb) diboride solid solutions and 1-2 mu m TiB2 grains. The best balance between hardness (24 GPa) and fracture toughness (6.8 MPa m(-2)) was found in 30 wt% NbC-TiB2 composites consolidated at 2000 degrees C for 5 min. (C) 2015 Elsevier Ltd and Techna Group S.r.l. All rights reserved.