Adhesion measurement procedures for kinetic and thermal spray coatings using a stud-pull tester

Elmoursi, Alaa A.; Patel, Nilesh K.

doi:10.1163/156856104839248

Cited by 9 publications

(6 citation statements)

References 3 publications

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“…The adhesion strength of the coating was tested using the stud pull adhesion tester (Elcometer 506 Digital Adhesion tester, UK) where an aluminium stud of diameter 14.2 mm was mounted on the coating surface using an epoxy paste (Araldite). The epoxy paste was cured in a furnace at 150°C for 3 h [25]. Three specimens were prepared for the adhesion test and an average value is reported.…”

Section: Characterisation Of Coatingsmentioning

confidence: 99%

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

Praveen

Sarangan

Suresh

et al. 2015

International Journal of Refractory Metals and Hard Materials

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Section: Characterisation Of Coatingsmentioning

confidence: 99%

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

Praveen

Sarangan

Suresh

et al. 2015

International Journal of Refractory Metals and Hard Materials

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“…The stud pull test, see Fig. 20 a , proposed by Elmoursi et al 246 is similar to the TAT described earlier. It can be applied to coatings deposited on any geometrically flat sample and employs a simple, portable pull-off tester.…”

Section: Thermal Spray Coating Testing Methodsmentioning

confidence: 73%

A review of testing methods for thermal spray coatings

Ang

Berndt

2014

International Materials Reviews

157

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The primary focus of this review concerns the test methods used to evaluate thermal spray coatings. Techniques to measure coating intrinsic properties such as (i) porosity and (ii) residual stress state; as well as extrinsic mechanical properties that include (iii) hardness, (iv) adhesion, (v) elastic modulus, (vi) fracture toughness, and (vi) the Poisson's ratio of thermal spray coatings are presented. This review also encompasses the feedstock and thermal spray method since process variants create a specific microstructure. An important aspect of this work is to highlight the extrinsic nature of mechanical property measurements with regard to thermal spray coatings. Thermal spray coatings exhibit anisotropic behaviour and microstructural artefacts such as porosity and the splat structure of coatings influence the mechanical characterisation methods. The analysis of coating data variability evolving from the different measurement techniques is of particular relevance to interpret the character of thermal spray deposits. Many materials can be thermal sprayed but this review focuses on alumina and partially stabilised zirconia since (i) these materials have many proven applications, and (ii) there is a wealth of information that has been reported on these ceramics.

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“…The stud pull adhesion tests were performed using a 14.2 mm (dia.) aluminium stud glued to the coating using an epoxy paste; the assembly was oven cured at 150°C (3 h.) following best practice reported by Elmoursi and Patel [54]. In order to ensure consistency, three samples were prepared and tested under identical conditions using an Elcometer-506 pull-off adhesion strength tester.…”

Section: Coating Characterisationmentioning

confidence: 99%

Effect of nano-Al₂O₃ addition on the microstructure and erosion wear of HVOF sprayed NiCrSiB coatings

Praveen

Arjunan

2019

Mater. Res. Express

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Development of nanostructured high velocity oxy-fuel (HVOF) coatings with low porosity, high strength and increased wear resistance is still in its infancy. Combining nanoparticles with conventional microscale powders are increasingly being investigated to use with feedstock materials for thermal spray processes. Accordingly, this work investigates the addition of nano-Al 2 O 3 particles on the microstructure and erosion wear of NiCrSiB HVOF coating in a stainless steel (AISI 304) substrate. Particle analysis of the NiCrSiB feedstock was conducted and the maximum allowable addition of Al 2 O 3 nanoparticles have been identified using the 'mass mixture ratio' model considering both the particle size and density. Consequently, two cases are considered and their performance analysed: a maximum allowable case of 1.4 wt%, followed by a 0.17 wt% addition of nano-Al 2 O 3 with NiCrSiB. Scanning Electron Microscope (SEM), Energy Dispersive Spectroscopy (EDS) and x-ray Diffraction (XRD) analysis were employed to inform the microstructure, material composition and phase spectrum of the resulting coatings. Subsequently, the nanostructured coating was exposed to both a pull-off adhesion strength test and hot air jet (450°C) hard particle erosion to characterise its performance. It was found that the microhardness of the HVOF NiCrSiB coating improved from 576 HV 0.3 to 748 HV 0.3 with the addition of 1.4 wt% nano-Al 2 O 3 . Furthermore, the nanostructured coating also exhibited high erosion resistance at a 90°erodent impact angle. The increase in erosion wear resistance was due to the increase in the hardness as a result of the nano-Al 2 O 3 addition. IntroductionSolid particle erosion wear plays an important role in the material degradation process of engineering components [1-3], including turbines, thermal power plants, pipelines, hydropower machinery and combustion systems [4,5]. According to Martinella [6], one of the major industries affected by solid particle erosion are coal based electric power plants. This is caused as a result of the fly ash interaction with the wall surfaces facilitated by the high-temperature flue gases. The prolonged effect of this causes the boiler components to fail and currently account for ∼25% of the down time [7]. The subsequent cost effect of erosion wear damage in such cases is often as high as 54% of the overall maintenance cost [8,9]. Consequently, coatings that can improve the surface resistance to solid particle erosion wear along with high-temperature oxidation protection systems are increasingly being sought.Among the numerous solution available to prevent or control the fly ash erosion, surface coatings [10] are the most widely adopted technique [11][12][13]. When it comes to coating methodology, several techniques are available including vapour deposition [14], electrochemical, sol-gel [14] and thermal spraying [14]. Among these different coating techniques, thermal spray techniques [15,16] have received increased attention largely due to their capacity to accommodate a range of ...

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Adhesion measurement procedures for kinetic and thermal spray coatings using a stud-pull tester

Cited by 9 publications

References 3 publications

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

A review of testing methods for thermal spray coatings

Effect of nano-Al₂O₃ addition on the microstructure and erosion wear of HVOF sprayed NiCrSiB coatings

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Adhesion measurement procedures for kinetic and thermal spray coatings using a stud-pull tester

Cited by 9 publications

References 3 publications

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

Erosion wear behaviour of plasma sprayed NiCrSiB/Al2O3 composite coating

A review of testing methods for thermal spray coatings

Effect of nano-Al2O3 addition on the microstructure and erosion wear of HVOF sprayed NiCrSiB coatings

Contact Info

Product

Resources

About

Effect of nano-Al₂O₃ addition on the microstructure and erosion wear of HVOF sprayed NiCrSiB coatings