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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.
Proceedings Inclusion? Planned: At-meeting proceedings

OTHER PAPERS PLANNED FOR THIS SYMPOSIUM

A Progress Report on the Synthesis and Characterization of MAX and MAB Phases
A Rational Design of Ultra-uniform Nanocrystalline Materials
Design, Synthesis and Processing of Novel Ionic Conductors for All-solid-state Batteries
Developing Materials and Coating Technologies for Mitigation of Lunar Dust Adhesion and Abrasion
Fabricating Alumina with Heterogeneous Microstructure Using Integrated Additive/Subtractive Manufacturing (IASM)
Fusion Welding of Structural Ceramics
Identifying Multidisciplinary Research Opportunities in Ceramic Processing
Indirect Additive Manufacturing of Ceramics
Investigating the Dependence of Microstructure Evolution in Alumina on the Liquid Phase Chemistry in the CaO-Al2O3-SiO2 System: Densification, Grain Growth and Secondary Phase Formation
Laser Shock Processing of Silicon Carbide Ceramics
Neutrons Guide Materials Design and Synthesis of Functional Oxides
Opportunities for Tailored Grain Boundary Networks in Thermomagnetically Processed Alumina Ceramics
Optimized Etching of Porcelain and Polycrystalline Alumina with a Glass Phase
Processing and Properties of High Thermal Conductive Silicon Nitride Ceramics
Self-bonded Refractories for Investment Casting Mold Manufacture
Synthesis and Flash Sintering of (Hf1-xZrx)B2 Solid Solution Fine Powders
Thermal Stability and Mechanical Properties of High-entropy Carbide Ceramics with Submicron Grain Size Fabricated by Spark Plasma Sintering
Transparent Ceramics by Lithography-Based Additive Manufacturing

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