ADVANCED MATERIALS & PROCESSES | JULY/AUGUST 2023 56 iTSSe TSS iTSSe TSS 11 JTST HIGHLIGHTS SUSPENSION PLASMA SPRAYED ZnO COATINGS FOR CO2 GAS DETECTION Kaichun Xu, Kewei Liu, Hanlin Liao, Sergi Dosta, and Chao Zhang Hollow spherical zinc oxide (ZnO), prepared by hydrothermal synthesis method with a soft template, was dispersed in deionized water to form a uniform suspension. The micromorphology, phase composition, and UV absorbance of ZnO powder were analyzed by SEM, EDS, XRD, and UV–Vis. The ZnO coatings were deposited on Al2O3 substrates equipped with Pt electrodes to fabricate gas sensors by suspension plasma spraying. The effects of CO2 concentration and relative humidity on the gas sensing properties of the ZnO coatings at room temperature (~ 25°C) were studied, and the gas sensing mechanism was discussed. (Fig. 1) 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 recent issues, as selected by JTST Editor-in-Chief André McDonald, are highlighted here. In addition to the print publication, JTST is available online through springerlink.com. For more information, visit asminternational.org/tss. Fig. 1 — Energy dispersive x-ray spectroscopy (EDS) image of as-prepared ZnO powder. Fig. 2 — Schematic illustration of LDED process and its finite element model using virtual rectangular elements. THREE-DIMENSIONAL NUMERICAL SIMULATION OF REPAIRING PROCESS BY LASER DIRECT ENERGY DEPOSITION Masayuki Arai, Toshikazu Muramatsu, Kiyohiro Ito, Taisei Izumi, and Hiroki Yokota In recent years, technology to properly repair damage detected during periodic inspections has been necessary to continue to use aging infrastructure. In the past, weld overlay repair was the most common repair technique. This study examined the possibility of laser direct energy deposition (LDED) repair technology, and its tensile and fatigue strength properties were compared to other typical repair methods. The LDED technique was found to be superior to other repair methods in terms of interfacial strength and mechanical properties. (Fig. 2)
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