Kinetic Metallization Application of Oxidation/Corrosion Resistant Coatings to Rocket Engine Combustion Chamber Liners
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1 Kinetic Metallization Application of Oxidation/Corrosion Resistant Coatings to Rocket Engine Combustion Chamber Liners AeroMat 2004 June 10, 2004 Ralph Tapphorn and Don Ulmer David Grimmett, Boeing-Rocketdyne Linus Thomas-Ogbuji, NASA-GRC
2 Overview Introduction to Kinetic Metallization Application Oxidation/Blanching Resistant Coatings for Combustion Chamber Liners Coating Properties Tensile Properties Thermal Conductivity Oxidation Test Results TGA Cyclic Oxidation
3 Kinetic Metallization Impact Consolidation Process Feed-stock: fine powder Accelerant: inert light gas Solid-state Consolidation No Bulk Melting No Liquid Chemicals Environmentally Innocuous No Particle or Hazardous Gas Emission
4 Process Flow Powder fluidized using pressurized He gas (PFU) Powder/gas mix thermally conditioned to improve deposition efficiency (TCU) Deposition nozzle produces highly collimated spray pattern Area coverage using X-Y rastering of nozzle and/or He PFU Substrate TCU Deposition Nozzle
5 First KM-CDS Shipped!! KM CDS Buyer: US Naval Academy Located: NAVSEA-Carderock Coating Development System Desk sized Production unit Same footprint Remove spray enclosure
6 Application MCC liner life in LOX/H 2 engine limited by thermal ratcheting failure initiated by cyclic oxidation/ reduction ( blanching ) of copper alloy liner SSME Main Combustion Chamber (MCC) Desire high conductivity coating that forms adherent, self healing oxide that is stable in H 2 Candidate coatings include CuxCr, where x = 20 to 30 vol.% Study initiated to select optimum
7 Advantages KM vs. Thermal Spray Eliminates: Porosity Oxygen pickup Interlayer bond coats Vacuum chamber
8 Coating Properties KM Cu-Cr Deposit Bulk Cu-Cr specimens machined from 10-mm thick KM deposits Tensile Thermal Conductivity Three Cu-Cr compositions evaluated: Tensile Specimens Copper Substrate Thermal Expansion Specimens Cu-20vol.%Cr Cu-25vol.%Cr Thermal Conductivity Specimens Cu-30vol.%Cr
9 Tensile Properties KM Cu-Cr tensile properties equivalent to wrought 60 Strength (ksi) or Ductility (%) Wrought KM Yield Ultimate Elong. R.A. 0 Cu-15vol.%Cr Cu-20vol.%Cr Cu-25vol.%Cr Cu-30vol.%Cr
10 Fractography Ductile, microvoid coalescence observed at room temperature
11 Thermal Conductivity KM Cu-Cr thermal conductivity equivalent to wrought Conductivity decreases with increasing Cr content Thermal Conductivity (Btu/hr-ft-F) Wrought Cu-15vol.%Cr KM Cu-20vol.%Cr KM Cu-25vol.%Cr KM Cu-30vol.%Cr Temperature (deg-f)
12 Oxidation Behavior Evaluation of KM Cu-Cr coated GRCop-84 TGA coupons included: Coating Adhesion Static Oxidation Cyclic Oxidation KM Cu-Cr Coated GRCop-84 TGA Coupons KM Cu-25vol.%Cr Three Cu-Cr compositions evaluated: Cu-20vol.%Cr Cu-25vol.%Cr GRCop-84
13 Coating Adhesion Coating adhesion improved by post-deposition heat Sebastian Pull Strength (ksi) As-Deposited Annealed at 1700F/1hr/Ar Note: Arrows indicate failure in epoxy Cu-20vol.%Cr Cu-25vol.%Cr Cu-30vol.%Cr
14 Static Oxidation Formation of continuous Cr 2 O 3 layer underneath external CuO slows oxidation rate 3 SpWt Gain (mg/sq-cm) Cu8Cr4Nb w/cu-17cr 20Cr w/cu-21cr 25Cr Cu-Cr coating CuO Cr 2 O 3 Oxidation Time (H)
15 Cyclic Oxidation Cyclic Temperature 77 ºK to 1023 ºK 1.02 Relative Wt Cr Cr 20.0 Cu-25vol.%Cr Cu-20vol.%Cr Cycle # (15-Min. Cycles) 650ºC 750ºC
16 Summary Kinetic Metallization achieves high density, adherent Cu-Cr coatings Eliminates need for interlayer bond coat Eliminates oxygen pickup during spray process Best balance of oxidation protection and mechanical properties offered by Cu-25vol. %Cr
17 Future Work NASA initiated new program to evaluate KM NiCrAlY coatings for next-generation LOX/kerosene engines KM NiCrAlY Preliminary work has shown that low porosity, welladherent KM NiCrAlY coatings can be applied to GRCop-84 No grit blasting surface preparation required No interlayer bond coat required
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