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 | A P R I L 2 0 2 3 4 3 iTSSe TSS JTST HIGHLIGHTS 11 A REVIEW OF THERMALLY SPRAYED POLYMER COATINGS Heli Koivuluoto Thermal spraying of polymer coatings has been applied for many decades. Initially, the focus was primarily on corrosion and wear protection. Manufacturing was performed with traditional methods, such as flame and plasma spraying. Later, thermal spray technologies were developed, and interest increased in producing polymer or polymer-composite coatings from different polymer materials with advanced spray processes. Additionally, novel application fields were studied, such as the use of thermally sprayed polymer coatings for anti-icing and anti-fouling purposes. (Fig. 3) A ROBOTIC POLISHING TRAJECTORY PLANNING METHOD COMBINING REVERSE ENGINEERING AND FINITE MESH TECHNOLOGY FOR AERO-ENGINE TURBINE BLADE TBCS Fan Yang, Zhenhua Cai, Yuepeng Chen, Shujuan Dong, Chunming Deng, Shaopeng Niu, Wei Zeng, and Shiping Wen The roughness of thermal barrier coatings (TBCs) prepared on the surface of aero-engine turbine blades affects the lifetime of the coating and the life cycle and aerodynamic performance of the blades. To reduce the TBC surface roughness, this study proposes a robot polishing trajectory planning method that combines reverse engineering and finite element mesh technology. (Fig. 4) Fig. 3 — Structures of plasma-sprayed hexaferrite/polyester (HF/ PES) Modified and reprinted with permission fromD. Lisjak, M. Begard, M. Bruehl, K. Bobzin, A. Hujanen, P. Lintunen, G. Bolelli, L. Lusvarghi, S. Ovtar and M. Drofenik, Hexaferrite/Polyester Composite Coatings for Electromagnetic-Wave Absorbers, J. Therm. Spray Technol., 2011, 20(3), p 638–644. Fig. 4 — Bézier surface fitting visualization: remaining point percentage = 100%. IMPROVED DEPOSITION EFFICIENCY OF LOWPRESSURE COLD-SPRAYED TIN COATING THROUGH POWDER RECYCLING Liliana Zarazua-Villalobos, Nicolas Mary, Chrystelle Bernard, Kazuhiro Ogawa, and Clement Boissy Cold spray is an advanced 3D technique to build thick coatings using ductile powders. Plastic deformations and physical interactions induced by kinetic energy are mainly the origins of interparticle and particle–substrate adhesion. The deposition efficiency, i.e., the quantity of matter deposited compared to the amount propelled, is directly linked to the parameters used in the cold spray. To improve this aspect, parameters’ optimization is also required with other solutions such as using thermally treated powders or powder blending with hard particles. (Fig. 5) Fig. 5 — SEM observations of fresh powder size distribution by laser granulometry of fresh and recycled Sn powder.
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