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Selective laser reaction synthesis of SiC, Si3N4 and HfC/SiC composites for additive manufacturing by Adam B. Peters; Dajie Zhang; Alberto Hernandez; Chuhong Wang; Dennis C. Nagle; Tim Mueller; James B. Spicer is a scholarly article available to read on EtoBox.

What is Selective laser reaction synthesis of SiC, Si3N4 and HfC/SiC composites for additive manufacturing about?

Selective laser reaction sintering techniques (SLRS) techniques were investigated for the production of near net-shape non-oxide ceramics including SiC, Si3N4, and HfC/SiC composites that might be compatible with prevailing powder bed fusion additive manufacturing processes. Reaction bonded layers of covalent ceramics were produced using in-situ reactions that occur during selective laser processing and layer formation. During SLRS, precursor materials composed of metal and/or metal oxide powders were fashioned into powder beds for conversion to non-oxide ceramic layers. Laser-processing was used to initiate simultaneous chemical conversion and local interparticle bonding of precursor particles in 100 vol% CH4 or NH3 gases. Several factors related to the reaction synthesis process—precursor chemistry, gas-solid and gas-liquid synthesis mechanisms, precursor vapor pressures—were investigated in relation to resulting microstructures and non-oxide yields. Results indicated that the volumetric changes which occurred during in-situ conversion of single component precursors negatively impacted the surface layer microstructure. To circumvent the internal stresses and cracking that accompa

Author

Adam B. Peters; Dajie Zhang; Alberto Hernandez; Chuhong Wang; Dennis C. Nagle; Tim Mueller; James B. Spicer

Publisher

Elsevier BV

Published

2023

Language

EN