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.

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

3. Why Mo on Steel ? Improves hardness Improves corrosion resistance Improves high temperature strength

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

14. Erosion: Cr* IML

15. Erosion: Mo* ML

16. Erosion: Comparison Cr* IML Mo* ML