|
1190 |
|
Wednesday, June 04, 2008, Room 04 8:20 AM HVOF and Flame Spraying New very hard coatings and modern powder feeding for economic dense coatings against wear and corrosion |
|
HVOF sprayed nylon-11 + nanodiamond composite coatings: production and characterization |
|
Richard Knight* / Drexel University, Department of Materials Science and Engineering, USA Vadym Mochalin/ Drexel University, Department of Materials Science and Engineering, USA Antonella Stravato/ Università degli Studi ?Roma Tre?, Dipartimento Ingegneria Meccanica e Industriale, Italy S. Charles Picardi/ NanoBlox, Inc., USA |
|
High velocity oxy-fuel (HVOF) combustion spraying has previously been shown to be a viable method for depositing polymer and polymer/ceramic composite coatings. The addition of hard particulate reinforcing phases to soft polymeric matrices should improve their durability and wear performance. Nano-sized diamond is an ideal reinforcing phase, owing to its high hardness and desirable thermal properties. Composite coatings comprising Nylon-11 reinforced with nanodiamonds have been successfully produced by HVOF.An important challenge is preserving the structure of the nanoparticles after thermal spray deposition and achieving a uniform dispersion of them within the polymeric matrix. Raman spectroscopy and X-ray diffraction confirmed the presence and retention of nanodiamonds after HVOF deposition. Understanding of the role of variables including the % loading of reinforcing phase in the matrix and powder preparation route are necessary. Results of compositional optimization, microstructural and mechanical property characterization, and investigations of macroscopic properties including nanoindentation and sliding wear behavior, will be presented. |