<p>Most thermal spray coating processes can be divided into three sub-processes;
substrate surface preparation, the thermal spray operation and a post-coating
surface finishing operation such as honing or grinding. Reliable and robust
surface preparation is needed to guarantee maximum coating adhesion to
substrates. Traditionally, the grit blasting process is used for surface preparation
of materials receiving a thermal spray coating. However, in high volume
production, the reproducibility of surface topography decays with time as grit
particles are recycled through surface preparation operation. The focus of this
project is to enhance the coating's ability to adhere to an aluminum substrate by
incorporating high pressure water jet as a surface preparation operation.
</p>
<p>Water pressure, standoff distance, number of orifices, orifice size and rotation
speed are process parameters identified as having an effect on surface
roughness and coating adhesion strength. Through classical statistical analysis,
main effects as well as 2 and 3 factor interactions are revealed and studied.</p>
<p>A direct and significant relationship exists between water pressure, standoff
distance and number of orifices. Correlation exists among adhesion strength
and surface roughness parameters Ra, Rq and Rtm, respectively.
Recommendations are made for further investigation into reducing water
pressure and rotation speed requirements while sustaining the same level of
surface modification.</p> / Master of Science
| Identifer | oai:union.ndltd.org:VTETD/oai:vtechworks.lib.vt.edu:10919/45227 |
| Date | 22 October 2009 |
| Creators | Accardo, Mario G. |
| Contributors | Industrial and Systems Engineering, Reasor, Roderick J., Sullivan, William G., Deisenroth, Michael P., Popoola, O. O. |
| Publisher | Virginia Tech |
| Source Sets | Virginia Tech Theses and Dissertation |
| Detected Language | English |
| Type | Master's project |
| Format | BTD, application/pdf |
| Relation | LD5655.V851_1995.A233.pdf |
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