Sliding Wear Properties of HVOF Thermally Sprayed Nylon-11 and Nylon-11/Ceramic Composites on Steel
- PDF / 499,184 Bytes
- 6 Pages / 593.972 x 792 pts Page_size
- 91 Downloads / 186 Views
L. Jackson, M. Ivosevic, R. Knight, and R.A. Cairncross (Submitted March 9, 2007; in revised form June 21, 2007) Polymer and polymer/ceramic composite coatings were produced by ball-milling 60 lm Nylon-11 together with nominal 10 vol.% of nano and multiscale ceramic reinforcements and by HVOF spraying these composite feedstocks onto steel substrates to produce semicrystalline micron and nanoscale reinforced polymer matrix composites. Room temperature dry sliding wear performance of pure Nylon11, Nylon-11 reinforced with 7 nm silica, and multiscale Nylon-11/silica composite coatings incorporating 7-40 nm and 10 lm ceramic particles were characterized using a pin-on-disk tribometer. Coefficient of friction and wear rate were determined as a function of applied load and coating composition. Surface profilometry and scanning electron microscopy were used to characterize and analyze the coatings and wear scars. The pure Nylon-11 coating experienced less wear than the composites due to the occurrence of two additional wear mechanisms: abrasive and fatigue wear.
Keywords
HVOF spraying of polymers, Nylon-11, sliding wear, wear resistance
1. Introduction and Background According to Brostow, wear is the progressive loss or damage of the operating surface of a body occurring as a result of relative motion at the surface (Ref 1). The reduction of surface wear is a common goal in many industries. Frequently repairing or replacing worn parts costs businesses both time and money. Therefore, producing more durable polymeric coatings for applications such as protecting machine parts would significantly broaden the marketability of thermally sprayed polymers. Wear and surface damage are the outcome of numerous factors, including various wear mechanisms, atmospheric degradation and applied loads. The wear mechanisms mostly associated with sliding contact with This article is an invited paper selected from presentations at the 2007 International Thermal Spray Conference and has been expanded from the original presentation. It is simultaneously published in Global Coating Solutions, Proceedings of the 2007 International Thermal Spray Conference, Beijing, China, May 1416, 2007, Basil R. Marple, Margaret M. Hyland, Yuk-Chiu Lau, Chang-Jiu Li, Rogerio S. Lima, and Ghislain Montavon, Ed., ASM International, Materials Park, OH, 2007. L. Jackson, Department of Materials Science and Engineering, North Carolina State University, Raleigh, NC, USA; M. Ivosevic and R. Knight, Department of Materials Science and Engineering, Drexel University, Philadelphia, PA, USA; and R.A. Cairncross, Department of Chemical and Biological Engineering, Drexel University, Philadelphia, PA, USA. Contact e-mail: [email protected].
Journal of Thermal Spray Technology
polymers are adhesion, abrasion, and fatigue (Ref 2). Adhesive wear results from opposing surface asperities coming into contact under load and undergoing shearing and/or plastic deformation. One asperity may be torn away from its base, generating wear debris if the interfacial bonding is stronge
Data Loading...
