Ultrafast-Contactless Flash Sintering using Plasma Electrodes

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 s...

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Bibliographic Details
Published in:Scientific reports 2016-06, Vol.6 (1), p.27222-27222, Article 27222
Main Authors: Saunders, Theo, Grasso, Salvatore, Reece, Michael J.
Format: Article
Language:English
Subjects:
639/301/1023/1024
639/301/1023/1025
Electrodes
Furnaces
Heat
Humanities and Social Sciences
multidisciplinary
Plasma
Power supply
Science
Sintering
Temperature
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Summary: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 B 4 C (discharge time 2s, current 4A) and SiC:B 4 C 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.
ISSN:2045-2322
2045-2322
DOI:10.1038/srep27222