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Development Of Electro-Spark Alloying (ESA) And Thermo-Reactive Electro-Spark Surface Strengthening (TRESS) Technologies And Set Of Equipment With Attachments For Mechanization
Final rept. 15 Aug 2005-15 May 2006
MOSCOW INST OF STEEL AND ALLOYS (USSR)
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This report results from a contract tasking Moscow State Institute of Steel and Alloys Technological University as follows The main goal of the project is to develop advanced ESA and TRESS coating technologies for application on Ti and superalloys substrates to resist high-cycle fatigue failure initiated at the blade roots. The bar and disc electrodes will be manufactured by self-propagating high temperature synthesis SHS method. Mechanical activation for systems with low exothermal effect will be applied. The influence of the SHS process parameters combustion rate and temperature. stoichiometry of the initial reaction mixture dispersivity of the reagent powders etc. on the structure and phase composition of the composite electrodes and the influence of the SHS-densification parameters densification pressure, time under pressure. delay time of densification after initiation of the combustion reaction on the porosity and physical-mechanical properties of the electrodes will be investigated. Hard. wear- corrosion- and oxidation resistant coatings up to 300 un thick based on oxides carbides silicates borides and nitrides of transition metals will be studied. Coating hardness. friction and wear behavior corrosion. and oxidation resistance will be investigated. Fabrication and transfer to AFRLMLBT of a set of ESA equipment with attachments for mechanization and a number of various disk and bar electrodes made of composite materials based on carbides. borides. nitrides intermetallides strengthened by nanoparticles.
APPROVED FOR PUBLIC RELEASE