Optimization of air plasma sprayed thermal barrier coating parameters in diesel engine applications

Azadi, M ; Sharif University of Technology | 2013

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  1. Type of Document: Article
  2. DOI: 10.1007/s11665-013-0629-5
  3. Publisher: 2013
  4. Abstract:
  5. In the present paper, an optimization of thermal barrier coating parameters is performed for diesel engine applications. The substrate is A356.0-T7, a cast aluminum alloy which has a vast application in diesel engines, and the alloy is coated by plasma sprayed ZrO2-8 wt.% Y2O3. Parameters including the feed rate of coating powders, the nozzle distance to specimen surfaces, and the coating thickness are optimized by thermal shock fatigue tests and bending tests. Optimum values of the feed rate and the nozzle distance are 30 g/min and 80 mm, respectively, when the objective is considered as maximizing the bending strength. Thermal shock tests demonstrate that lower thickness of coating layers has a better lifetime. By increasing the coating thickness, the thermal fatigue lifetime decreases. The reason is due to higher order of stresses near the interface of the substrate and the bond coat layer, calculated by a finite element simulation. One suggestion to improve the lifetime is to use multiple layers of coatings
  6. Keywords:
  7. Diesel engine ; Thermal barrier coating ; Thermal shock fatigue test ; Air plasma sprayed thermal barrier coatings ; Cast aluminum alloy ; Coating parameters ; Coating thickness ; Diesel engine applications ; Fatigue lifetime ; Finite element simulations ; Specimen surfaces ; Coatings ; Fatigue testing ; Interfaces (materials) ; Nozzles ; Optimization ; Plasma spraying ; Thermal barrier coatings ; Thermal shock ; Thickness measurement ; Diesel engines
  8. Source: Journal of Materials Engineering and Performance ; Volume 22, Issue 11 , 2013 , Pages 3530-3538 ; 10599495 (ISSN)
  9. URL: http://link.springer.com/article/10.1007%2Fs11665-013-0629-5