Honors College Thesis
 

Thermodynamics of Laser-Assisted Solution Combustion Synthesis of Yttrium Oxide

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  • To assess the conversion and embedment of yttrium nitrate to yttrium oxide using selective laser melting, a thermodynamic approach for laser power and scan speed predictions on surface temperature, recoil pressure, and resulting track morphology window are employed. Inkjet printing is used to deposit the liquid film of yttrium nitrate onto a stainless-steel substrate, providing an advantage in terms of energy consumption reduction while maintaining a continuous film morphology. Using two different laser powers and three different scanning speeds, the samples are analyzed post-selective-laser-processing using X-ray diffraction to characterize the crystalline peaks of embedded yttrium oxide. Laser power of 150 W and scan speed of 100 mm/s showed good agreement in theoretical absorptivity with literature of 0.76 and all samples indicate some yttrium oxide peaks. Surface temperature predictions in conjunction with the XRD data suggests that higher laser scan speed (or lower residence time over sample) can enhance the emergence of the mature polycrystalline peaks by reducing mixing and subsequent masking effects with the surrounding stainless-steel substrate matrix.
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