Analytical Electron Microscopy of W-Core beta-SiC Fibers for Use in an SiC-Based Composite Material for Fusion Applications

作者：Toplisek Tea; Gec Medeja; Ivekovic Aljaz; Novak Sasa; Kobe Spomenka; Drazic Goran^*

来源：Microscopy and Microanalysis, 2013, 19(S5): 136-139.

DOI：10.1017/S1431927613012506

• SEM
• TEM
• silicon carbide
• fibers
• fusion

In this work, the interactions between tungsten (W) and silicon carbide (SiC) in Sigma (TM) SiC fibers at high temperatures were characterized using scanning and transmission electron microscopy. These fibers could have the potential for use in fusion-related applications owing to their high thermal conductivity compared with pure SiC-based fibers. The as-received fibers were composed of a 100-mu m-thick shell of radially textured beta-SiC grains and a 15-mu m-thick tungsten core, composed of a few hundreds of nm-sized elongated tungsten grains. The interfaces between the tungsten and the SiC and the SiC and the outer coatings were sharp and smooth. After heat treatment at 1,600 degrees C for 3 h in Ar, the tungsten core reacted with SiC to form a rough interface surface. Inside the core, W5Si3, W3Si, and W2C phases were detected using energy-dispersive X-ray spectroscopy and electron-diffraction techniques. The mechanical properties of the fibers deteriorate after the heat treatment.

• 出版日期2013-8