Mechanical properties of welded SiC-ZrB2 and SiC-ZrB2-ZrC ceramics were measured up to 1700 °C. Commercial powders were hot pressed, machined into coupons, and preheated to 1600 °C before joining the ceramics using either tungsten inert gas welding or plasma arc welding. Toughness of the parent materials was 3–4 MPa*m1/2 which decreased after welding to 2–2.5 MPa*m1/2. Strength of the SiC-ZrB2-ZrC parent material was ~700 MPa at 25 °C, ~300 MPa at 1700 °C, and retained 40–60% of this strength once welded. Strength of the SiC-ZrB2 parent material was ~600 MPa at 25 °C and 1700 °C and retained 20–30% of this strength once welded. Griffith analysis indicated that the strength in the parent materials was controlled by the size of SiC clusters while strength of welds was controlled by the size of pores in fusion zones. Therefore, removal of pores in produced fusion zones should be investigated to improve strength of future ceramic welds.
J. D. Jarman et al., "Mechanical Properties of Fusion Welded Ceramics in the SiC-ZrB2 and SiC-ZrB2-ZrC Systems," Journal of the European Ceramic Society, vol. 42, no. 5, pp. 2107 - 2117, Elsevier, May 2022.
The definitive version is available at https://doi.org/10.1016/j.jeurceramsoc.2022.01.019
Materials Science and Engineering
Keywords and Phrases
Borides; Carbides; Joints/joining; Phase equilibria; Ultra-high temperature ceramics
International Standard Serial Number (ISSN)
Article - Journal
© 2023 Elsevier, All rights reserved.
01 May 2022
U.S. Department of Energy, Grant 0055606U