Study of the splat formation for plasma sprayed NiCr on aluminum substrate as a function of substrate condition

Brossard, S.; Munroe, Paul; Tran, Anh Phuong; Hyland, Margaret

doi:10.1016/j.surfcoat.2010.02.013

Cited by 33 publications

(13 citation statements)

References 30 publications

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“…Furthermore, the various FIB and TEM cross sections did not show any noticeable difference in structure either. Mg is expected to form a very thin layer of MgO on the surface of the substrate upon heat treatment of the substrate (Ref 28, 30), and, indeed, this was observed on several cross sections (see results presented in a previous study (Ref 28) or such as on Fig. 12 (4) and Fig.…”

Section: Summary Of the Splat Formation Processmentioning

confidence: 64%

Study of the Splat Microstructure, Splat-Substrate Interface, and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed on to Aluminum Substrates

et al. 2010

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This study investigates the mechanisms of formation of plasma-sprayed coatings, through the study of splat morphology and the splat-substrate interface of NiCr single splats sprayed onto Al substrates, at both micro-and nano-scale levels, using a range of electron microscopy techniques. This study provides direct observation of extensive substrate melting, together with chemical inter-mixing with the splat and the formation of metastable interfacial phases (including both non-equilibrium phases and metallic glasses). In addition, voids and a range of oxide phases were observed. The mechanisms of formation of these features are discussed. Two aluminum alloys (with and without Mg additions) and three different sets of substrate surface conditions (polished, and heat treated prior to and during spraying) were used to investigate the variations in splat morphologies induced by the different preparation conditions. It was found that the heating of substrate during spraying significantly reduced splashing.

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Section: Summary Of the Splat Formation Processmentioning

confidence: 64%

Study of the Splat Microstructure, Splat-Substrate Interface, and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed on to Aluminum Substrates

et al. 2010

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“…Norint padidinti dangos sukibimą su substratu, bandiniai turi būti tinkamai paruošti prieš terminį purškimą. Aliuminio ir jo lydinių paviršiui apdoroti yra naudojami cheminiai, mechaniniai, elektriniai (katodiniai) ir kiti valymo būdai (Joshi et al 2011;Cherepy et al 2005;Brossard et al 2010;Elbing et al 2003;Anagreh, Robaidi 2010;Prysiazhnyi et al 2012).…”

Section: įVadasunclassified

Research of Properties of Sprayed Coatings on the Aluminium Alloys / Aliuminio Lydinių Plazminio Purškimo Tyrimas

Lukauskaitė

Kovaliov

Černašėjus

2013

Mokslas - Lietuvos Ateitis

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Santrauka. Straipsnyje nagrinėjami aliuminio lydinio AW 5754 katodinio valymo procesai ir nuvalyto substrato paviršiaus dengimas plazminiu būdu Ni-Cr-Si-Fe danga. Eksperimentinių bandymų metu nustatytas aliuminio substrato šiurkštumas po katodinio valymo, esant skirtingiems katodinio valymo parametrams. Tyrimo metu buvo palygintos apskaičiuotos vidutinės galios 1,6-9 kW plazmotrono voltamperinės charakteristikos su eksperimentiniais rezultatais. Parinkti aliuminio substrato optimalūs katodinio valymo proceso parametrai ir nustatytas plazminiu būdu užpurkštos nikelio pagrindo dangos porėtumas ir morfologija.Reikšminiai žodžiai: plazmotronas, plazmotrono voltamperinės ir šiluminės charakteristikos, katodinis valymas, paviršiaus šiurkštumas, plazminis purškimas. AbstractIn article the cathodic cleaning processes of aluminum alloy AW 5754 and cleaned substrate surface coating by plasma with Ni-Cr-Fe-Si powder were researched. Aluminium substrate roughness after cathodic treatment at different cathodic treatment parameters was established during the experiments. During the investigation a comparison of the calculated medium power 1.6 to 9 kW plasma torch voltage-current characteristics with the experimental results was made. The optimized parameters of aluminium cathode substrate cleaning process were selected; porosity and morphology of plasma sprayed nickel-based coating were determined.

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“…Effects of a thermal treatment prior to plasma spraying on the substrate surface chemistry, roughness, and splat formation, were discussed in previous papers (Ref 8,39). In summary, it was found that such heat treatment increased the c-Al 2 O 3 content of the oxide layers already present on the surface, partially dehydrating them (reducing the hydroxide content), and increasing the thickness (a few nanometers), and roughness (slightly from about 7 to 8 nm).…”

Section: Splat Microstructure and Formation On The Etched And Etched mentioning

confidence: 99%

Effects of Substrate Roughness on Splat Formation for Ni-Cr Particles Plasma Sprayed onto Aluminum Substrates

et al. 2010

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Roughening of the substrate, for instance by grit-blasting or etching, is often used before plasma spraying in order to provide a high degree of roughness that promotes mechanical interlocking of the sprayed coating and consequently improved adhesion. This study investigates the morphology and microstructure of NiCr splats formed on such rough Al substrates, where roughness was generated by a number of methods including grinding and etching. Cross sections of the splats and the splat-substrate interface were examined using a range of electron microscopy techniques. Localized substrate melting and chemical mixing with the splat material was observed, forming very particular structures. The formation of various oxides phases and voids was also noted and found to increase, along with the degree of the substrate melting, with increasing substrate roughness. The structures observed were related to the spray conditions and substrate morphology.

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Study of the splat formation for plasma sprayed NiCr on aluminum substrate as a function of substrate condition

Cited by 33 publications

References 30 publications

Study of the Splat Microstructure, Splat-Substrate Interface, and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed on to Aluminum Substrates

Study of the Splat Microstructure, Splat-Substrate Interface, and the Effects of Substrate Heating on the Splat Formation for Ni-Cr Particles Plasma Sprayed on to Aluminum Substrates

Research of Properties of Sprayed Coatings on the Aluminium Alloys / Aliuminio Lydinių Plazminio Purškimo Tyrimas

Effects of Substrate Roughness on Splat Formation for Ni-Cr Particles Plasma Sprayed onto Aluminum Substrates

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