February AMP_Digital

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 | F E B R U A R Y / M A R C H 2 0 1 9 4 7 iTSSe TSS JTST HIGHLIGHTS used sparingly in the aerospace industry due to their lower fracture toughness and limited lifetime expectancy. Lifetime of TBCs is highly influenced by the topcoat microstructure. The objective of this work was to study the TBCs produced using axial SPS with different process parameters. Influence of the microstructure on coating lifetime was of particular interest and it was determined by thermal cyclic fatigue testing. The effect of sintering on the microstructure of the coatings when exposed to high temperatures was also investigated. Porosity measurements were taken using image analysis, and thermal conductivity of the coatings was determined by laser flash analysis. Results show that axial SPS is a promising method of producing TBCs having various microstructures with a good lifetime. Changes in microstructure of the topcoat due to sin- tering were evident in porous coatings, whereas dense top- coats showed good resistance against sintering (Fig. 2). Fig. 2 — Comparative distribution in area % of coarse (>2 µm 2 ), fine (<2 µm 2 ), and total porosity. MICROSTRUCTURAL CHARACTERIZATION AND ROOM-TEMPERATURE EROSION BEHAVIOR OF AS-DEPOSITED SPS, EB-PVD AND APS YSZ-BASED TBCs Rogerio S. Lima, Bruno M.H. Guerreiro, and Maniya Aghasibeig The erosion behavior at room temperature of as-depos- ited suspension plasma spray (SPS), electron beam physical vapor deposition (EB-PVD) and air plasma spray (APS) ZrO 2 - Y 2 O 3 (YSZ)-based TBCs was investigated. All coatings were deposited on Inconel 625 alloy coupons. The same APS CoN- iCrAlY bond coat was employed for all SPS and APS TBCs. The erodent material was 50-µm alumina, and the impact angles were 15° and 90°. A total of four different types of SPS YSZ-based TBCs were tested, which consisted of two distinct columnar-segmented and two distinct columnar-grown mi- crostructures. The EB-PVD and APS YSZ TBCs were employed as benchmarks. The erosion performance of the different TBCs in this study was ranked based on the coating volume loss after wear testing. The TBC microstructures and phase 13 2019 ITSC EXHIBITOR SHOWCASE VISIT THESE KEY EXHIBITORS AND MORE AT ITSC 2019 EXHIBITION HOURS Pacifico Yokohama Convention Center Monday, May 27 • 9:00 a.m. to 7:00 p.m. Tuesday, May 28 • 9:00 a.m. to 5:00 p.m. Wednesday, May 29 • 9:00 a.m. to 1:30 p.m. DEWAL THERMAL SPRAY TAPES DeWAL manufactures the world’s most complete line of thermal spray tapes. After years developing and improving these precisionplasma tapes, DeWAL manufactures them in Rhode Island for aircraft engine, automo- tive and medical manufacturers. DeWAL tapes are used by all three major aircraft engine manufacturers—GE, Pratt & Whitney, and Rolls-Royce. DeWAL tapes are free of carbonizing materials for grit blast, ceram- ic, plasma, arc, and HVOF spraying. Whatever temperature or spray angle, they adhere aggressively, ensuring sharp edges, then separate cleanly. Single and double-ply tapes, all manufactured with proprietary silicone adhesive technology, are available worldwide. DeWAL is part of Rogers Corp. www.dewal.com Booth 413 SAINT-GOBAIN COATING SOLUTIONS Saint-Gobain is a world class manu- facturer of equipment and consumables for the thermal spray coatings industry. Our extensive equipment experience dates back to 1920 with the development of the first oxy-acteylene flame wire gun followed by Rokide® Spray Systems, Plasma Spray Systems, PTA and many innovative materials. We offer a wide range of consumables in the form of powder, flexible cords, Rokide® rods, and ingots for use in many different applications and industries. We supply our own rawmate- rials and this enables us to develop a product to meet your exact needs. www.coatingsolutions.saint-gobain.com . Booth 301