Journal
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
Volume 39, Issue 15, Pages 4664-4672Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2019.07.036
Keywords
Joining; Polymer-derived ceramics; SPS; Flash sintering; Flash-SPS
Categories
Funding
- JECS Trust [2018172]
- Air Force Office of Scientific Research [FA9550-17-1-0526]
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The feasibility of flash joining conductive ceramics using spark plasma sintering is demonstrated. It is shown that graphite disks can be joined in a few seconds (6-10 s electric discharge time) using a SiOC precursor (methyl silicone resin) as an interlayer. Differently from usual flash experiments, the process does not require any preheating, allowing a dramatic reduction of the processing time. XPS analysis of the joint revealed a clear evolution of the chemical environment of silicon with a progressive transition from SiOC to SiO2/SiC. Mechanical tests were performed to determine the fracture toughness (1.0 +/- 0.2 MPa m(0.)(5)) and fracture energy (40.6 +/- 9.8 J/m(2)) of the interface Flash joining can be applied beyond graphite joining, and opens a novel and flexible processing route for many conductive ceramics, as demonstrate by preliminary work on Kanthal (R) Super MoSi2 and C-f-reinforced SiC.
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