R. Knight, R. A. Cairncross, Drexel University, Philadelphia, PA; L. C. Jackson, North Carolina State University, Raleigh, NC; M. Ivosevic, Resodyn Corporation, Butte, MT
The high velocity oxy-fuel (HVOF) combustion spray process has previously been shown to be a successful method for depositing pure polymer and polymer/ceramic composite coatings. Polymer and polymer-ceramic composite particles have high melt viscosities and require the high kinetic energy of HVOF in order to generate sufficient particle flow and deformation on impact. One of the goals of reinforcing polymer coatings with particulate ceramics is to improve their durability and wear performance. Composite coatings were produced by ball-milling 60 μm mean particle size Nylon-11 powder together with nominal 10 vol. % nano and multi-scale ceramic reinforcements and HVOF spraying these composite feedstocks onto steel substrates to produce semi-crystalline micron and nano-scale reinforced polymer matrix composites. The room temperature dry sliding wear performance of pure Nylon-11, Nylon-11 reinforced with 7 nm silica, and multi-scale Nylon-11/silica/alumina composite coatings incorporating 7 to 40 nm and 3 to 15 μm ceramic particles has been determined and compared. Coatings were sprayed onto steel substrates, and their sliding wear performance determined using a pin-on-disk tribometer. Coefficient of friction was recorded and wear rate determined as a function of applied load, rotational velocity, sliding distance, counterbody material, and coating composition. Surface profilometry and scanning electron microscopy were used to characterize and analyze the coatings and wear scars.
The high velocity oxy-fuel (HVOF) combustion spray process has previously been shown to be a successful method for depositing pure polymer and polymer/ceramic composite coatings. Polymer and polymer-ceramic composite particles have high melt viscosities and require the high kinetic energy of HVOF in order to generate sufficient particle flow and deformation on impact. One of the goals of reinforcing polymer coatings with particulate ceramics is to improve their durability and wear performance. Composite coatings were produced by ball-milling 60 μm mean particle size Nylon-11 powder together with nominal 10 vol. % nano and multi-scale ceramic reinforcements and HVOF spraying these composite feedstocks onto steel substrates to produce semi-crystalline micron and nano-scale reinforced polymer matrix composites. The room temperature dry sliding wear performance of pure Nylon-11, Nylon-11 reinforced with 7 nm silica, and multi-scale Nylon-11/silica/alumina composite coatings incorporating 7 to 40 nm and 3 to 15 μm ceramic particles has been determined and compared. Coatings were sprayed onto steel substrates, and their sliding wear performance determined using a pin-on-disk tribometer. Coefficient of friction was recorded and wear rate determined as a function of applied load, rotational velocity, sliding distance, counterbody material, and coating composition. Surface profilometry and scanning electron microscopy were used to characterize and analyze the coatings and wear scars.
