Area of Technology:Engineering Sciences
Title of the Innovation: Fe based Bulk Metallic glass (BMG) coatings (NMR-FeBMG)
Brief About Innovation
Fe based Bulk Metallic glass (BMG) coatings (NMR-FeBMG)
Bulk metallic glasses (BMGs) do not possess three-dimensional periodic arrangements of atoms and hence do not have “crystalline defects”. As a result, bulk metallic glasses exhibit high strength, hardness, high elastic strain, erosion-corrosion resistance, and soft magnetic properties compared to conventional crystalline metallic materials. BMGs have exceptional elastic strain limit and resilience far exceeding any conventional metallic material.
Fe-based BMG coatings are developed using the HVOF technique. These coatings have hardness ranging minimum from 750 VHN, high corrosion & erosion–corrosion resistance equivalent to wrought super duplex stainless steel. These coatings possess good adhesion strength, porosity less than 2 %, surface finish in microns after grinding. These coatings may be used in place of hard chrome plating and WC coatings.
Salient features:
· High hardness · High corrosion and wear resistance · High erosion-corrosion resistance · High adhesion strength · Less porosity · Good surface finish · Good fracture toughness
Applications: · Journals of turbine rotors, Crank shafts, Hydraulics, Piston rings, valves, shock absorbers and other Civil sectors, Steel mills, oil & gas industry, aerospace and rail road applications
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