| About this Abstract |
| Meeting |
MS&T21: Materials Science & Technology
|
| Symposium
|
Manufacturing and Processing of Advanced Ceramic Materials
|
| Presentation Title |
Recent Progress in Fusion Welding of Structural Ceramics and Composites |
| Author(s) |
William G. Fahrenholtz, Greg Hilmas, Jeremy Watts, Jecee Jarman |
| On-Site Speaker (Planned) |
William G. Fahrenholtz |
| Abstract Scope |
This presentation will describe the fusion welding of boride and carbide based ceramics and ceramic matrix composites. Methods including plasma arc welding and gas tungsten arc welding have been developed in our laboratory for joining transition metal boride and carbide ultra-high temperature ceramics, which are amenable to fusion welding methods based on their intrinsic thermal and electrical conductivities. Welding is performed in a controlled atmosphere with low oxygen partial pressure to prevent oxidation of the welded parts. Welds are produced by preheating specimens to ~1500°C to mitigate thermal shock issues. Welding parameters including current, translation speed, and gas flow rates can be optimized using statistical methods to produce high quality welds. Weld microstructure development is affected by specimen composition and heating parameters and must be controlled to produce joints with acceptable mechanical behavior. Examples of welding of several ceramic compositions will be discussed. |