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Meeting Materials Science & Technology 2020
Symposium Processing and Performance of Materials Using Microwaves, Electric and Magnetic Fields, Ultrasound, Lasers, and Mechanical Work – Rustum Roy Symposium
Presentation Title Laser Processing Cokes and Chars
Author(s) Randy L. Vander Wal, Joseph Abrahamson
On-Site Speaker (Planned) Randy L. Vander Wal
Abstract Scope Laser processing of materials is not new, but, using lasers to anneal, bond and otherwise transform carbons is. Fundamental understanding of the dependence upon carbon structure, morphology and chemistry is critical to implementing this technology into manufacturing and processing applications. In this work a Q-switched Nd:YAG laser and a continuous wave CO2 laser are used to anneal anthracene coke and sucrose char. Anthracene coke and sucrose char were selected for laser annealing because they represent a model graphitizable and non-graphitizable carbon, respectively. Lasers provide rapid heating and cooling with high temporal control. The extent of transformation is kinetically controlled by time above the threshold temperature for transformation. Enabling the annealing trajectories from these two very different carbon materials to be followed with respect to time above temperature. To resolve the nanostructure changes HRTEM is employed. Results are compared with RexaxFF.


Deforming Polycrystalline Ceramics by Dislocation Based Plastic Deformation
Engineering Far-from-Equilibrium Materials Using Electromagnetic Fields
Ionic and Mixed Ionic Electronic Conductor Oxides for Microwave Active Catalysis
Laser Ablation & Passivation of Aluminum Alloys
Laser Processing Cokes and Chars
Microwave-assisted Hydrothermal Carbonization of Switchgrass and Low Rank Coals for Solid Fuel Production
Recent Developments In Microwave-metal Discharge Based Machining Process and Associated Challenges
Study of Mechanical Properties of Microwave Processed Biodegradable Metal Composites
The Effect of Microwave Sintering on Additively Manufactured Ceramics
The Use of Alternate Electromagnetic Fields to Control Biofilm

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