Characterization of fusion welded ceramics in the SiC-ZrB2-ZrC system

Jarman, Jecee D.; Fahrenholtz, William G.; Hilmas, Greg E.; Watts, Jeremy L.; King, Derek S.

doi:10.1016/j.jeurceramsoc.2020.10.067

Characterization of fusion welded ceramics in the SiC-ZrB₂-ZrC system

Journal Article · Sat Jan 02 00:00:00 EST 2021 · Journal of the European Ceramic Society

DOI:https://doi.org/10.1016/j.jeurceramsoc.2020.10.067· OSTI ID:1772547

Jarman, Jecee D. ^[1]; ^[2]; ^[2]; Watts, Jeremy L. ^[2]; ^[3]

Missouri Univ. of Science and Technology, Rolla, MO (United States); UES, Inc.
Missouri Univ. of Science and Technology, Rolla, MO (United States)
UES, Inc., Dayton, OH (United States)

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. Here, 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.

View Accepted Manuscript (DOE)

Research Organization:: UES, Inc., Dayton, OH (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: SC0017082

OSTI ID:: 1772547

Alternate ID(s):: OSTI ID: 1778450

Journal Information:: Journal of the European Ceramic Society, Journal Name: Journal of the European Ceramic Society Journal Issue: 4 Vol. 41; ISSN 0955-2219

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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36 MATERIALS SCIENCE
borides
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Characterization of fusion welded ceramics in the SiC-ZrB₂-ZrC system