Characterization of Fusion Welded Ceramics in the SiC-ZrB₂-ZrC System
Various SiC-ZrB2-ZrC ceramics were joined by fusion welding to determine the maximum silicon carbide content that could be joined. Commercial powders were hot pressed, machined, and preheated to 1450 °C before joining with a tungsten inert gas welding torch at 160–200 A. Resulting welds were cross-sectioned and analyzed to determine which compositions were weldable and to characterize microstructural evolution in welded samples. As compositions approached the ternary eutectic, the welds had smaller SiC grains and exhibited better weldability. Penetration depth of welds was controlled by a combination of current input and welding speed. The ternary eutectic in the system was found at 36.9 ± 1.3 vol% SiC, 42.7 ± 1.5 vol% ZrB2, and 20.4 ± 1.9 vol% ZrC and its melting temperature was 2330 ± 23 °C. A ternary phase diagram for the SiC-ZrB2-ZrC was constructed and proposed via microstructural analysis of arc melted pellets on binary joins between each binary eutectic and the ternary eutectic in the system.
J. D. Jarman et al., "Characterization of Fusion Welded Ceramics in the SiC-ZrB₂-ZrC System," Journal of the European Ceramic Society, vol. 41, no. 4, pp. 2255-2262, Elsevier, Apr 2021.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2020.10.067
Materials Science and Engineering
Keywords and Phrases
Borides; Carbides; Joints/Joining; Phase Equilibria; Ultra-High Temperature Ceramics
International Standard Serial Number (ISSN)
Article - Journal
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01 Apr 2021