Saunders Theo, Grasso Salvatore, Reece Michael J
School of Engineering and Material Science, Queen Mary University of London, London, E1 4NS, UK.
Sci Rep. 2016 Jun 8;6:27222. doi: 10.1038/srep27222.
This paper presents a novel derivative of flash sintering, in which contactless flash sintering (CFS) is achieved using plasma electrodes. In this setup, electrical contact with the sample to be sintered is made by two arc plasma electrodes, one on either side, allowing current to pass through the sample. This opens up the possibility of continuous throughput flash sintering. Preheating, a usual precondition for flash sintering, is provided by the arc electrodes which heat the sample to 1400 °C. The best results were produced with pre-compacted samples (bars 1.8 mm thick) of pure B4C (discharge time 2s, current 4A) and SiC:B4C 50 wt% (3s at 6A), which were fully consolidated under a heating rate approaching 20000 °C/min. For the composite a cylindrical volume of 14 mm(3) was sintered to full density with limited grain growth.
本文介绍了一种新型的快速烧结衍生物，即通过等离子体电极实现非接触式快速烧结（CFS）。在这种装置中，通过两个电弧等离子体电极与待烧结样品进行电接触，两侧各一个，使电流通过样品。这为连续通量快速烧结开辟了可能性。电弧电极提供了快速烧结通常所需的预热条件，将样品加热到1400°C。纯B4C预压实样品（1.8毫米厚的棒材，放电时间2秒，电流4A）和50 wt% SiC:B4C（6A下3秒）取得了最佳结果，它们在接近20000°C/分钟的加热速率下完全固结。对于该复合材料，14立方毫米的圆柱体积被烧结至全密度，且晶粒生长有限。
