1. Wetting of WC by a Zr-base metallic glass-forming alloy.
- Author
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Shen, Ping, Zheng, Xiao-Hong, Liu, Hui-Jie, and Jiang, Qi-Chuan
- Subjects
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ZIRCONIUM alloys , *WETTING , *METALLIC glasses , *HOT pressing , *POLYCRYSTALS , *TEMPERATURE effect , *ADSORPTION (Chemistry) , *TUNGSTEN carbide - Abstract
Wetting of hot-pressed polycrystalline WC substrates by a Zr55Cu30Al10Ni5 bulk metallic glass (BMG)-forming alloy was investigated at 1133–1253 K in a high vacuum using a modified sessile drop method. The alloy melt spread rapidly on the WC surface, reaching no more than 30° within 3 s, and then slowly (at T < 1213 K) or even remained steady (at T ≥ 1213 K) in the subsequent isothermal dwelling stage. The final equilibrium contact angles were between 11° and 20°, slightly increasing with rising temperature and thus presenting an appreciably anomalous temperature-dependent behavior. The reaction between WC and the Zr-base melt was moderate, slightly enhancing with increasing temperature, and yielded W, ZrC and W5Zr3 at the interface. The wetting, in principle, was driven by the formation of a precursor film in front of the triple line as a result of the adsorption of active atoms (primarily Zr) rather than by the interfacial reaction. From the viewpoint of the wettability and reactivity, WC is a good reinforcement for the preparation of the Zr-base BMG matrix composites. [ABSTRACT FROM AUTHOR]
- Published
- 2013
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