Coatings to Protect Materials from Extreme Environments: Coatings for Harsh Environments
Sponsored by: ACerS Engineering Ceramics Division
Program Organizers: Kang Lee, NASA Glenn Research Center; Yutaka Kagawa, High Performance Materials; Daniel Mumm, University of California, Irvine; Rodney Trice, Purdue University; Emmanuel Boakye, UES Inc.; Valerie Wiesner, NASA Langley Research Center; Edward Gorzkowski, Naval Research Laboratory; Scooter Johnson, Naval Research Laboratory; Richard Chromik, McGill University; Jun Song, McGill University; Christian Moreau, Concordia University; Stephen Yue, Mcgill University

Thursday 8:00 AM
November 5, 2020
Room: Virtual Meeting Room 31
Location: MS&T Virtual

Session Chair: Scooter Johnson, Naval Research Laboratory; Emmanuel Boakye, UES Inc.


8:00 AM  Cancelled
Direct-writing by Micro Cold Spray of Yttria (Y2O3) Films for Reactive Metal Casting: Aidan Moyers1; Desiderio Kovar1; Michael Becker1; John Keto1; 1University of Texas at Austin
    The micro cold spray process operates by accelerating aerosolized nanoparticles through a nozzle from sub-atmosphere to a vacuum (1-2 Torr). These nanoparticles, moving at 100-500 m/s, impact a substrate mounted on an x-y-z stage to allow for the direct-writing of conformal films on complex surfaces. Unlike cold spray, a similar process using larger particles and higher pressures, micro cold spray has the demonstrated capacity to deposit highly dense ceramic films at room temperature. Current methods for producing protective ceramic films for casting reactive metals require the use of binders and extensive post-processing, making the simplicity and high purity of micro cold spray films an attractive alternative. In this study, we performed experiments to determine how processing variables such as the aerodynamics of the carrier gas affected the density of yttria films. Next, we simulated nanoparticles under these aerodynamic conditions to determine their impact velocity as a predictor of film quality.

8:20 AM  
Electrodeposited NiMo Coatings for Improved Molten Salt Reactor Performance: Rajeswaran Radhakrishnan1; Kamyar Ahmadi2; Timothy Hall1; Stephen Snyder1; Stephen Raiman3; 1Faraday Technology Inc; 2University of Houston; 3Oak Ridge National Laboratory
    The use of molten fluoride salts as a primary coolant within next generation nuclear reactors has the potential to improve efficiency and nuclear reactor safety by operating at low pressures and high temperatures without boiling. However, these coolants will require the development of new corrosion resistant material systems that will have to meet/supersede existing standard codes for these systems. Within this context, Faraday Technology Inc. will discuss their research work on electrodeposition of functionally graded NiMo alloys onto ASME certified substrates and subsequent high temperature corrosion evaluation in molten fluoride salt electrolytes. A wide array of electrolytes and processing parameters were evaluated in order to understand their effects on the deposit composition, structure, and corrosion resistance properties. In this talk we will demon the potential to compositionally graded the NiMo coating and potential to improve the durability and lifetime of materials within this system, while reducing the component cost.

8:40 AM  
Obtaining Surface Coatings Providing Protection Against High Temperatures in the Production of Coke: Borys Sereda1; Dmytro Sereda1; Aleksandr Gaydaenko1; 1Dneprovsky State Technical University
    For machines and assemblies, in aggressive environments and in the production of coke, high corrosion resistance is required. Surface coatings obtained in SHS conditions improve the characteristics of the material, providing protection from extreme conditions, such as high temperature.This method of protection is the most promising and less expensive. The composition of the saturating medium is selected based on the requirements for the use of protective coatings on the studied materials. The production environment of a coke-chemical enterprise is characterized by an uneven distribution of aggressive substances in the working area. A comparative analysis of the corrosion resistance of protective coatings obtained under SHS conditions showed an increase of 1.7-2.0 times in comparison with the results processed under isothermal conditions when the equipment was operated at high temperatures in the conditions of coke production.

9:00 AM  
Obtaining Wear-resistant Titanium Coatings in SHS Conditions: Borys Sereda1; Dmytro Sereda1; Irina Palehova1; 1Dneprovsky State Technical University
    Offered promising methods of applying protective wear-resistant coatings - technology for producing powder coatings by in a high-temperature synthesis (SHS). This kind of protection is the most promising and less costly, since it does not require changes in the technology of materials. For parts operating under conditions of wear, alternating loads, high temperatures, speeds and pressures, as well as aggressive corrosive environments, the properties of the surface layer are of great importance. In work with the use of mathematical modeling, optimal compositions of SHS blends have been developed to produce titanium-chromium coatings that positively affect the properties of the resulting coatings operating in extreme conditions. A thermodynamic analysis was performed to calculate the equilibrium state of the reaction products in multicomponent powder systems. The research results are due to an increase in the microhardness of the layer surface by 1.8-2.1 times.