Thermal contact resistance between plasma-sprayed particles and flat surfaces

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Journal titleInternational Journal of Heat and Mass Transfer
Pages17371749; # of pages: 13
SubjectTermal spray coating; Cooling rate; Non-dimensional temperature; Heat conduction; Splat-substrate interface; Two-color pyrometry
AbstractPlasma-sprayed molybdenum and yttria-stabilized zirconia particles (38–63 µm diameters) were sprayed onto glass and Inconel 625 held at either room temperature or 400 °C. Samples of Inconel 625 were also preheated for 3 h, and then air-cooled to room temperature before spraying. Photographs of the splats were captured by using a fast charge-coupled device (CCD) camera. A rapid two-color pyrometer was used to collect thermal radiation from the particles during flight and spreading to follow the evolution of their temperature. The temperature evolution was used to determine the cooling rate of spreading particles. An analytical heat conduction model was developed to calculate the thermal contact resistance at the interface of the plasma-sprayed particles and the surfaces from splat cooling rates. The analysis showed that thermal contact resistance between the heated or preheated surfaces and the splats was more than an order of magnitude smaller than that on non-heated surfaces held at room temperature. Particles impacting on the heated or preheated surfaces had cooling rates that were significantly larger than those on surfaces held at room temperature, which was attributed to smaller thermal contact resistance.
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AffiliationNational Research Council Canada (NRC-CNRC); NRC Industrial Materials Institute
Peer reviewedYes
NRC number49398
NPARC number15795087
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Record identifier154635af-4475-435f-b011-35cd040fd3de
Record created2010-07-09
Record modified2016-05-09
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