Microstructure and mechanical properties of SiC-nanowire-augmented tungsten composites
Microstructure and mechanical properties of SiC-nanowire-augmented tungsten composites
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DOI：
10.1016/j.jallcom.2011.06.005
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发表时间：
2011-09
影响因子：
6.2
通讯作者：
Dongju Lee;Hee-Sub Park;H. Ryu;Seokwoo Jeon;S. Hong
中科院分区：
文献类型：
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作者：
Dongju Lee;Hee-Sub Park;H. Ryu;Seokwoo Jeon;S. Hong
本研究研究了SiC纳米线的添加对钨基复合材料微观结构和力学性能的影响。采用喷雾干燥工艺和原位放电等离子烧结工艺制备了SiC-纳米线增强钨复合材料。在烧结过程中形成了三个独特的反应相：钨、碳化钨（W2C）和棒状硅化钨（W5Si3）。添加 SiC 纳米线的钨复合材料的弯曲强度从 706MPa 显着增加到 924MPa，W2C 和 W5Si3 相的形成也是如此。杆型W5Si3通过分担一部分载荷并提供桥接机制来承受很大的应力。此外，观察到碳化硅纳米线增强的钨复合材料在高温下具有高耐烧蚀性。
The effect of an addition of SiC nanowire on the microstructure and mechanical properties of tungsten-based composites is investigated in this study. SiC-nanowire-augmented tungsten composites were prepared by a spray-drying process and an in situ spark plasma sintering process. Three distinctive reaction phases, tungsten, tungsten carbide (W2C) and rod-type tungsten silicide (W5Si3) were formed during the sintering process. The flexural strength was significantly increased from 706MPa to 924MPa in tungsten composites augmented with SiC nanowires, as was the formation of W2C and W5Si3phases. The rod-type W5Si3bears significant stress by both sharing a portion of the load and providing a bridging mechanism. Furthermore, a high ablation resistance at an elevated temperature was observed for tungsten composites augmented with SiC nanowires.