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Title: Solidification of welded SiC–ZrB 2 –ZrC ceramics

Abstract

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.

Authors:
ORCiD logo [1];  [2];  [1];  [1];  [2]; ORCiD logo [2]
  1. UES, Inc. Dayton Ohio
  2. Missouri University of Science and Technology Rolla Missouri
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1433268
Resource Type:
Publisher's Accepted Manuscript
Journal Name:
Journal of the American Ceramic Society
Additional Journal Information:
Journal Name: Journal of the American Ceramic Society Journal Volume: 101 Journal Issue: 9; Journal ID: ISSN 0002-7820
Publisher:
Wiley-Blackwell
Country of Publication:
United States
Language:
English

Citation Formats

King, Derek S., Watts, Jeremy L., Cissel, Kathleen S., Kadhim, Ali H., Hilmas, Gregory E., and Fahrenholtz, William G. Solidification of welded SiC–ZrB 2 –ZrC ceramics. United States: N. p., 2018. Web. doi:10.1111/jace.15570.
King, Derek S., Watts, Jeremy L., Cissel, Kathleen S., Kadhim, Ali H., Hilmas, Gregory E., & Fahrenholtz, William G. Solidification of welded SiC–ZrB 2 –ZrC ceramics. United States. https://doi.org/10.1111/jace.15570
King, Derek S., Watts, Jeremy L., Cissel, Kathleen S., Kadhim, Ali H., Hilmas, Gregory E., and Fahrenholtz, William G. Sat . "Solidification of welded SiC–ZrB 2 –ZrC ceramics". United States. https://doi.org/10.1111/jace.15570.
@article{osti_1433268,
title = {Solidification of welded SiC–ZrB 2 –ZrC ceramics},
author = {King, Derek S. and Watts, Jeremy L. and Cissel, Kathleen S. and Kadhim, Ali H. and Hilmas, Gregory E. and Fahrenholtz, William G.},
abstractNote = {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.},
doi = {10.1111/jace.15570},
journal = {Journal of the American Ceramic Society},
number = 9,
volume = 101,
place = {United States},
year = {Sat Apr 14 00:00:00 EDT 2018},
month = {Sat Apr 14 00:00:00 EDT 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1111/jace.15570

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Cited by: 9 works
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