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Plasma Arc Welding of TiB2–20 vol% TiC
Article first published online: 14 DEC 2013
© 2013 The American Ceramic Society
Journal of the American Ceramic Society
Volume 97, Issue 1, pages 56–59, January 2014
How to Cite
King, D. S., Hilmas, G. E., Fahrenholtz, W. G. (2014), Plasma Arc Welding of TiB2–20 vol% TiC. Journal of the American Ceramic Society, 97: 56–59. doi: 10.1111/jace.12693
- Issue published online: 3 JAN 2014
- Article first published online: 14 DEC 2013
- Manuscript Accepted: 2 OCT 2013
- Manuscript Received: 3 JUL 2013
- AFOSR. Grant Number: FA9550-12-C-0060
Ceramics consisting of titanium diboride with titanium carbide additions were fusion welded to produce continuous joins. A welding current of 135 A, welding speed of 8 cm/min, and plasma flow rate of 0.75 L/min were combined with a preheat temperature of ~1450°C to fusion weld coupons of TiB2 containing 20 vol% TiC with a thickness of 4 mm. The resulting fusion zone (FZ) was 3.9 mm deep at the center of the joint and 10.4 mm wide. During cooling of the melt pool, four distinct regions of crystal growth and nucleation were observed due to thermal gradients. Regions at the top and bottom of the FZ exhibited smaller TiB2 crystals due to higher nucleation rates whereas regions in the middle of the FZ showed higher growth rates, with TiB2 crystals up to 1.2 mm in length. Thermal gradients also affected cooling of the eutectic phase, causing a cellular structure to appear in the cooled eutectic. Plasma arc welding was a viable method for joining diboride-based ceramics.