Materials Performance

APR 2017

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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49 NACE INTERNATIONAL: VOL. 56, NO. 4 MATERIALS PERFORMANCE APRIL 2017 Continued f rom page 47 INFORM Congress. INFLUENCE Policy. IMPACT your Industry. NACE Annual Legislative Day June 7 - 8, 2017 | Washington, DC Inform members of Congress of NACE's mission to protect people, assets, and the environment from the adverse effects of corrosion. Registration for the event is free and all NACE members are encouraged to attend. To register and for more information, visit nace.org/LegDayMP COATINGS & LININGS ESSENTIALS splatting onto a surface. at splatting ac- tion is a key part of a project to lay down ceramic coatings kinetically. By making high-velocity submicron ceramic particles slam onto surfaces at room temperature, the high temperatures otherwise required to process ceramics such as alumina (Al 2 O 3 ) and barium titanate (BaTiO 3 ) are avoided. Coating at room temperature makes microelectronics design and fabrication more flexible and could someday lead to better, less expensive microelectronic com- ponents that support modern technology. e kinetic process produces nanocrystal- line films that are very strong and could be used as protective coatings against wear, corrosion, and oxidation. Because ceramic components are pro- cessed at temperatures of ~1,300 °F (700 °C) or more, it can be difficult to combine them with similar hard materials and then inte- grate them into devices with materials that have relatively low melting temperatures. e ability to put down ceramics at room temperature means that ceramics and lower-melting temperature materials can be processed at the same time. e coatings are created with an aerosol deposition process that uses kinetic energy instead of heat and draws on special mate- rial properties found at the micro- and na- noscale. A nozzle accelerates submicron particles suspended in a gas toward a sur- face. When a particle impacts the substrate or another layer, it plastically deforms and changes shape by a process known as dislo- cation nucleation and slip. e researchers discovered the particles have nanofractures that make them "lay down onto a substrate like splatting cookie dough, forming a pancake-shaped grain." As the next particle hits and deforms, it tamps down the original layer to create an even tighter bond. is mechanism makes many layers possible, so coatings that are tens of microns thick can be created. e process also spans the microscale gap between two established technologies: thin films and thermal spray technology. in films are coating layers, ranging in size from nanometers to a few microns. ermal spray technology can produce coatings starting at ~50 µm up to a few centimeters. Source: Sandia National Laboratories, web site: sandia.gov.

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