Influence of Substrate Shape and Roughness on Coating Microstructure in Suspension Plasma Spray

Caio, Fernanda; Moreau, Christian

doi:10.3390/coatings9110746

Cited by 16 publications

(11 citation statements)

References 28 publications

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“…Based on these values and the transversal gun path, the spray distances were calculated, as shown in Table 3, in association with the spray angle. The difference in the spray distances between the different spraying techniques is due to the shorter spray distance generally used for SPS as compared to the longer spray distance in APS [16,17,22]. Using the same methodology as in [8], the coating was not applied on the whole piston surface but on the piston sections that are most affected by the heat during the combustion cycle [30].…”

Section: Coating Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

“…Caio and Moreau [22] also illustrated the challenges of SPS coatings deposition on complex shapes. Three different shapes with different roughness were sprayed, and different microstructures were observed, from thicker dense coatings in the center of the substrate to thin columnar coatings in the edges [22]. This variation was due to the substrate shape characteristics, e.g., with different curvature radius, there were effects on the deposition rate and the column growth.…”

Section: Introductionmentioning

confidence: 98%

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Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

2020

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Thermal barrier coatings (TBCs) are considered a promising solution for improving the efficiency of internal combustion engines. Among the thermal spray processes, the relatively newly developed suspension plasma spray (SPS) is an attractive candidate due to its unique microstructural features that have already demonstrated increased performance in gas turbine applications. To achieve these features, thermal spray conditions play an essential role. In specific uses, such as piston of diesel engines, parameters as spray angle and spray distance pose challenges to keep them constant during the whole spray process due to the complex geometry of the piston. To understand the effect of the spray distance and spray angle, a comprehensive investigation of the produced thermal spray microstructure on the piston geometry was conducted. Flat and complex geometry surfaces were coated using the same plasma parameters while the spray angle and distance were changed. Characterization was performed using scanning electron microscopy (SEM) combined with the image analysis technique to perceive the variation of the thickness and microstructures features such as pores, cracks, column density, and column orientation. The results showed that the changes in spray angles and spray distances due to the complex shape of the substrate have a significant influence on the microstructure and thermal properties (thermal conductivity and thermal effusivity) of the coatings. The thermal conductivity and thermal effusivity were calculated by modeling for the different regions of the piston and measured by laser flash analysis combined with modeling for the flat-surfaced coupon. It was shown that the modeling approach is an effective tool to predict the thermal properties and thus to understand the influence of the parameters on the coating properties. Connecting the observations of the work on the microstructural and thermal properties, the complex geometry’s influence on the produced coatings could be diminished by tailoring the process and generating the most desirable TBC for the internal combustion engines in future applications.

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Section: Coating Productionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 98%

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Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

2020

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“…The roughness of the MAPLE-deposited rapamycin-PVP thin films onto silicon was much higher than that of uncoated Si[ 16 ]. In general, thin films with <600 nm thickness[ 17 ] tend to closely follow the topography of the substrate. The MAPLE-deposited rapamycin-PVP thin films show a morphology similar to that of other MAPLE-deposited structures[ 18 ].…”

Section: Resultsmentioning

confidence: 99%

Matrix-Assisted Pulsed laser Evaporation-deposited Rapamycin Thin Films Maintain Antiproliferative Activity

Cristescu

Neguț

Visan

et al. 2020

IJB

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Matrix-assisted pulsed laser evaporation (MAPLE) has many benefits over conventional methods (e.g., dip-coating, spin coating, and Langmuir–Blodgett dip-coating) for manufacturing coatings containing pharmacologic agents on medical devices. In particular, the thickness of the coating that is applied to the surface of the medical device can be tightly controlled. In this study, MAPLE was used to deposit rapamycin-polyvinylpyrrolidone (rapamycin-PVP) thin films onto silicon and borosilicate optical glass substrates. Alamar Blue and PicoGreen studies were used to measure the metabolic health and DNA content of L929 mouse fibroblasts as measures of viability and proliferation, respectively. The cells on the MAPLE-deposited rapamycin-PVP surfaces exhibited 70.6% viability and 53.7% proliferation compared to a borosilicate glass control. These data indicate that the antiproliferative properties of rapamycin were maintained after MAPLE deposition.

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“…On the basis of literature review, it can be stated that from the wide range of SPS materials, the yttria stabilised zirconia (YSZ) is the most examined feedstock material [27][28][29]. Moreover, the depiction procedure of the YSZ is being systematically developed.…”

Section: Introductionmentioning

confidence: 99%

Mechanical Properties and Sliding Wear Resistance of Suspension Plasma Sprayed YSZ Coatings

Łatka¹,

Szala²,

Macek³

et al. 2020

Adv. Sci. Technol. Res. J.

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In this work, the yttria stabilised zirconia ZrO 2 + 8 wt% Y 2 O 3 (YSZ) coatings were studied. The coatings were manufactured by using a relatively new method based on liquid feedstock, called suspension plasma spraying (SPS). The main aim of the study was to investigate the influence of one of the fundamental process parameters, stand-off distance, on the YSZ coating mechanical properties, namely adhesion, cohesion, hardness, and dry sliding wear resistance. Moreover, the coating surface morphology and microstructure were investigated. Despite the fact that in the SPS method, the heat flux into the substrate is much higher than in conventional atmospheric plasma spraying (APS), for the stand-off distances as short as 40 mm, the structure has not been damaged by thermal stresses. The results revealed that shorter spray distance leads to obtaining the coatings characterised by higher cohesion and adhesion to the substrate as well as higher hardness and resistance to sliding wear. The wear mechanism of both YSZ coatings relies on the adhesive mode, which is intensified by severe coating material delamination.

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Influence of Substrate Shape and Roughness on Coating Microstructure in Suspension Plasma Spray

Cited by 16 publications

References 28 publications

Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

Microstructural Changes in Suspension Plasma-Sprayed TBCs Deposited on Complex Geometry Substrates

Matrix-Assisted Pulsed laser Evaporation-deposited Rapamycin Thin Films Maintain Antiproliferative Activity

Mechanical Properties and Sliding Wear Resistance of Suspension Plasma Sprayed YSZ Coatings

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