iTSSe TSS A D V A N C E D M A T E R I A L S & P R O C E S S E S | J U L Y / A U G U S T 2 0 2 1 5 5 iTSSe TSS 9 INFLUENCE OF PROCESS PARAMETERS ON THE AEROSOL DEPOSITION (AD) OF YTTRIASTABILIZED ZIROCNIA PARTICLES Tarini Prasad Mishra, Reeti Singh, Robert Mücke, Jürgen Malzbender, Martin Bram, Olivier Guillon, and Robert Vaßen Aerosol deposition (AD) is a novel deposition process for the fabrication of dense and rather thick oxide films at room temperature. The bonding of the deposited ceramic particles is based on a shock-loading consolidation, resulting from the impact of the ceramic particles on the substrate. However, the deposition mechanism is not fully understood. In addition, many technical challenges have been observed for achieving a successful deposition of the oxides with higher efficiency. In The Journal of Thermal Spray Technology (JTST), the official journal of the ASM Thermal Spray Society, publishes contributions on all aspects—fundamental and practical—of thermal spray science, including processes, feedstock manufacture, testing, and characterization. As the primary vehicle for thermal spray information transfer, its mission is to synergize the rapidly advancing thermal spray industry and related industries by presenting research and development efforts leading to advancements in implementable engineering applications of the technology. Articles from the February and April issues, as selected by JTST Editor-in-Chief Armelle Vardelle, are highlighted here. The April issue is a special issue containing selected and expanded papers based on presentations at the 10th Asian Thermal Spray Conference (ATSC 2020). The last three articles highlighted below are from this special issue. In addition to the print publication, JTST is available online through springerlink.com. For more information, visit asminternational.org/tss. this work, the influence of different processing parameters on the properties of the deposited layer is studied. Proof of concept was done using 8 mol.% yttria-stabilized zirconia (8YSZ) powder as starting material. The window of deposition with respect to carrier gas flows for successful deposition was identified. (Fig. 1) A SELF-CONSISTENT SCHEME FOR UNDERSTANDING PARTICLE IMPACT AND ADHESION IN THE AEROSOL DEPOSITION PROCESS Robert Saunders, Scooter D. Johnson, Douglas Schwer, Eric A. Patterson, Heonjune Ryou, and Edward P. Gorzkowski Aerosol deposition (AD) is a thick-film deposition process that can produce films tens to hundreds of micrometers thick with densities greater than 95% of the bulk at room temperature. However, the precise mechanisms of bonding and densification are still under debate. To better understand and predict deposition, a self-consistent approach is employed that combines computational fluid dynamics (CFD), finite-element (FE) modeling, and experimental observation of particle impact to improve the understanding of particle flight, impact, and adhesion in the AD process. First, deposition is performed with a trial material to forma film. The process parameters are fed into a CFD model that refines the particle flow and impact velocity for a range of sizes. These values are in turn used to 10 Fig. 1 — Image of the inside view and front view of the nozzle used in the current work. Fig. 2 — Particle state after 25 ns for oblique impacts of (a) 2.5°, (b) 15°, and (c) 30° for an Al2O3 particle onto an Al2O3 substrate. (a) (b) (c) JTST HIGHLIGHTS
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