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Molybdenum Coating on Steel

•
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Deepak Rajput
Deepak Rajput

A presentation on Interlayer Assisted Molybdenum Coatings on Steel through LISI made by Deepak Rajput. It was presented as a seminar requirement at the University of Tennessee Space Institute.

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www.utsi.edu Deepak Rajput , Kathleen Lansford, Lino Costa, William Hofmeister Center for Laser Applications University of Tennessee Space Institute 411 B. H. Goethert Parkway Tullahoma, TN 37388 Interlayer Assisted Molybdenum Coatings on Steel through LISI TM Contact: drajput@utsi.edu PHYS 593 Independent Study: Physics Seminar
Properties of Mo ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Why Mo on Steel ? Improves hardness Improves corrosion resistance Improves high temperature strength
Direct LD of Mo on Steel: Problems ,[object Object],[object Object]
Solution ,[object Object],Mo Fe Mo Fe IML intermetallics No intermetallics No intermetallics Phase diagrams show that Cr, V and Nb are the best intermediate layers (IML)
Chemistry & Stoichiometry ,[object Object],[object Object],[object Object],temperature Cr CrB 2 CrB 2 Cr % CrB 2 Cr + 10.5% CrB 2 Eutectic: System that melts at a temperature much lower than its constituents Cr-B and Mo-B form eutectic systems
Process: LISI TM ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Precursor Deposition Precursor mixture = Metal Powders + Binder Precursor mixture steel air Spray gun 250-300 μ
Laser Deposition Cr* = 165W, 25mm/s, Hatch 0.1mm @ 355mm Mo* = 180W, 25mm/s, Hatch 0.1mm @355mm Steel Cr IML Mo Layer
Coatings Cr* Intermediate Layer Mo* Main Layer Cr IML Mo ML Steel Substrate: 4340 Alloy Steel SEM pictures
EDS Analysis Cr IML Mo IML Fe: 11.9 % Fe: 11.5 % Cr: 21 % Mo: 67.5 % Cr: 88.1 % We are working !
Microhardness: Cr* IML Hardness: 1050 VHN
Microhardness: Mo* ML Hardness: 1200 - 1400 VHN
Erosion: Cr* IML
Erosion: Mo* ML
Erosion: Comparison Cr* IML Mo* ML
Summary ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
Further investigation ,[object Object],[object Object],[object Object]
[object Object]
[object Object],[object Object]

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Molybdenum Coating on Steel

  • 1. www.utsi.edu Deepak Rajput , Kathleen Lansford, Lino Costa, William Hofmeister Center for Laser Applications University of Tennessee Space Institute 411 B. H. Goethert Parkway Tullahoma, TN 37388 Interlayer Assisted Molybdenum Coatings on Steel through LISI TM Contact: drajput@utsi.edu PHYS 593 Independent Study: Physics Seminar
  • 2.
  • 3. Why Mo on Steel ? Improves hardness Improves corrosion resistance Improves high temperature strength
  • 4.
  • 5.
  • 6.
  • 7.
  • 8. Precursor Deposition Precursor mixture = Metal Powders + Binder Precursor mixture steel air Spray gun 250-300 μ
  • 9. Laser Deposition Cr* = 165W, 25mm/s, Hatch 0.1mm @ 355mm Mo* = 180W, 25mm/s, Hatch 0.1mm @355mm Steel Cr IML Mo Layer
  • 10. Coatings Cr* Intermediate Layer Mo* Main Layer Cr IML Mo ML Steel Substrate: 4340 Alloy Steel SEM pictures
  • 11. EDS Analysis Cr IML Mo IML Fe: 11.9 % Fe: 11.5 % Cr: 21 % Mo: 67.5 % Cr: 88.1 % We are working !
  • 12. Microhardness: Cr* IML Hardness: 1050 VHN
  • 13. Microhardness: Mo* ML Hardness: 1200 - 1400 VHN
  • 17.
  • 18.
  • 19.
  • 20.