Solidification of welded SiC–ZrB 2 –ZrC ceramics

King, Derek S.; Watts, Jeremy L.; Cissel, Kathleen S.; Kadhim, Ali H.; Hilmas, Gregory E.; Fahrenholtz, William G.

doi:10.1111/jace.15570

Solidification of welded SiC–ZrB ₂ –ZrC ceramics

Journal Article · Sat Apr 14 00:00:00 EDT 2018 · Journal of the American Ceramic Society

DOI:https://doi.org/10.1111/jace.15570· OSTI ID:1433268

^[1]; Watts, Jeremy L. ^[2]; Cissel, Kathleen S. ^[1]; Kadhim, Ali H. ^[1]; Hilmas, Gregory E. ^[2]; ^[2]

UES, Inc. Dayton Ohio
Missouri University of Science and Technology Rolla Missouri

Abstract

A silicon carbide‐based ceramic, containing 50 vol% SiC, 35 vol% ZrB ₂ , and 15 vol% ZrC was plasma arc welded to produce continuous fusion joints with varying penetration depth. The parent material was preheated to 1450°C and arc welding was successfully implemented for joining of the parent material. A current of 138 A, plasma flow rate of ~1 L/min or ~0.5 L/min, and welding speed of ~8 cm/min were utilized for repeated joining, with full penetration fusion zones along the entire length of the joints. Solidification was determined to occur through the crystallization of β‐SiC (3C), then the simultaneous solidification of SiC and ZrB ₂ , and lastly through the simultaneous solidification of SiC, ZrB ₂ , and ZrC through a ternary eutectic reaction. The ternary eutectic composition was determined to be 35.3 ± 2.2 vol% SiC, 39.3 ± 3.8 vol% ZrB ₂ , and 25.4 ± 3.0 vol% ZrC. A dual fusion zone microstructure was always observed due to convective melt pool mixing. The SiC content at the edge of the fusion zone was 57 vol%, while SiC content at the center of the fusion zone was 42 vol% although the overall SiC content was still nominally 50 vol% throughout the entire fusion zone.

View Accepted Manuscript (Publisher)

Sponsoring Organization:: USDOE

Grant/Contract Number:: NONE; SC0017082

OSTI ID:: 1433268

Alternate ID(s):: OSTI ID: 1541604

Journal Information:: Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 9 Vol. 101; ISSN 0002-7820

Publisher:: Wiley-BlackwellCopyright Statement

Country of Publication:: United States

Language:: English

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