Molybdenum and a molybdenum alloy were fusion welded to ZrB2-based ceramics to determine if the electrical and thermal properties of the metals and ceramics affected their weldability. Commercial ceramic powders were hot pressed, machined into coupons, and preheated to 1600 °C before joining the ceramics to commercial metals using plasma arc welding. Weldability varied as indicated by the range of porosity observed within the fusion zones. Measured thermal and electrical properties appeared to have little to no effect on the weldability of metal-ceramic welds despite the large range of values measured across each property. Differences in melting temperatures between metal and ceramic coupons did affect weldability by changing the weld penetration depth into ceramic coupons. Future studies on metal-ceramic welds are suggested to investigate the effect that work function, melt viscosity, wetting, or other properties have on weldability.
J. D. Jarman et al., "Fusion Welding of Refractory Metals and ZrB2-SiC-ZrC Ceramics," Journal of the European Ceramic Society, vol. 42, no. 13, pp. 5195 - 5207, Elsevier, Oct 2022.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2022.06.055
Materials Science and Engineering
Keywords and Phrases
Borides; Carbides; Joints/joining; Refractory metals; Ultra-high temperature ceramics
International Standard Serial Number (ISSN)
Article - Journal
© 2023 Elsevier, All rights reserved.
01 Oct 2022
National Nuclear Security Administration, Grant DE-NA0002839