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Meeting Materials Science & Technology 2020
Symposium Manufacturing and Processing of Advanced Ceramic Materials
Presentation Title Fusion Welding of Structural Ceramics
Author(s) William G. Fahrenholtz, Greg Hilmas, Jeremy Watts
On-Site Speaker (Planned) William G. Fahrenholtz
Abstract Scope This presentation will describe the fusion welding of boride and carbide based structural ceramics. 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. Butt welds are produced by preheating specimens to ~1500C 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.


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