Advanced Materials & Processes

FEB 2015

Covers developments in engineering materials selection, processing, fabrication, testing/characterization, materials engineering trends, and emerging technologies, industrial and consumer applications, as well as business and management trends

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FEATuRE L ow pressure and vacuum plasma spray technologies are making headway in many emerging industries, along with their primary use in commercial and military aero- space gas turbine engine applications. Vacuum plasma has also been implemented in biomedical and electronics appli- cations. figures 1 and 2 show a vacuum plasma system, while figs. 3 and 4 show a low pressure coating system (LPcs) man- ufactured by amt ag. Both systems pump down the atmosphere to <0.1 torr and backfill to processing pressure in a short time. stable at- mospheric pressure regulation and reliable part handling are critical for proper coating quality. therefore, state-of-the-art control software and hardware is used as well as a new robotic and computer numerical control (cnc) technique. LOW PRESSuRE AND vACuum PLASmA SPRAY COATING PROPERTIES Low pressure and vacuum plasma spray produce coat- ings with better performance properties than those made by traditional air plasma spray (aPs). By carefully controlling the processing environment, exceptional coating properties with regard to microstructure (porosity, oxide content, den- sity), phase composition, and mechanical attributes may be achieved. it is also possible to hold oxide content to less than 1% and reach coating densities near 99%. Plasma coatings of nicraly, shown in fig. 5, are produced in a low pressure plasma spray atmosphere. these coatings exhibit enhanced oxidation protection and increased resis- tance to spallation in gas turbine engines. LOW PRESSuRE AND vACuum PLASmA SPRAY BuILD BETTER COATINGS FOR ENGINE APPLICATIONS Ludwig Guggenheim, Ralph Herber, and Silvano Keller, AMT AG, Dottingen, Switzerland Robert Gansert*, Advanced Materials & Technology Services Inc., Simi Valley, Calif. *Member of ASM International and ASM Thermal Spray Society Fig. 1 — Vacuum plasma spray system. Fig. 2 — Vacuum plasma spray in operation. Fig. 3 — Low pressure coating system (LPcs). iTSSe | tSS i T S S e | 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 2 0 1 5 8

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