Structural characterization of an electrically insulating diffusion barrier on a plasma-sprayed ceramic for severe environment applications

Joly, Alexandre; Brun, P.; Lacombe, J.; Tricot, Grégory; Denoirjean, Alain

doi:10.1016/j.surfcoat.2012.12.020

Cited by 12 publications

(8 citation statements)

References 6 publications

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“…Thus, improving the corrosion resistance of superalloy substrates, such as gas-turbine blades, has been a very distinct line of research and publication (Ref [13][14][15]. Besides this, the high electrical resistivity of these coatings has been exploited to achieve insulating coatings for use in electronics (Ref [16][17][18][19].…”

Section: Metal Oxide Passive Layersmentioning

confidence: 99%

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

Gardon

Guilemany

2014

J Therm Spray Tech

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Titanium dioxide has been the most investigated metal oxide due to its outstanding performance in a wide range of applications, chemical stability and low cost. Coating processes that can produce surfaces based on this material have been deeply studied. Nevertheless, the necessity of coating large areas by means of rapid manufacturing processes renders laboratory-scale techniques unsuitable, leading to a noteworthy interest from the thermal spray (TS) community in the development of significant intellectual property and a large number of scientific publications. This review unravels the relationship between titanium dioxide and TS technologies with the aim of providing detailed information related to the most significant achievements, lack of knowhow, and performance of TS TiO 2 functional coatings in photocatalytic, biomedical, and other applications. The influence of thermally activated techniques such as atmospheric plasma spray and high-velocity oxygen fuel spray on TiO 2 feedstock based on powders and suspensions is revised; the influence of spraying parameters on the microstructural and compositional changes and the final active behavior of the coating have been analyzed. Recent findings on titanium dioxide coatings deposited by cold gas spray and the capacity of this technology to prevent loss of the nanostructured anatase metastable phase are also reviewed.

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Section: Metal Oxide Passive Layersmentioning

confidence: 99%

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

Gardon

Guilemany

2014

J Therm Spray Tech

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“…Alumino-phosphate binders have been widely used in the development of refractories materials [ 1 , 2 , 3 , 4 ] acid–base cements [ 5 ] and protective coatings [ 6 , 7 , 8 ], due to their high bonding strength, abrasion resistance, and very high temperature stability. Those binders are generally prepared by heat-treating alumino-phosphate solutions that are obtained by dissolving Al 2 O 3 or Al(OH) 3 in diluted phosphoric acid solutions.…”

Section: Introductionmentioning

confidence: 99%

“…Those binders are generally prepared by heat-treating alumino-phosphate solutions that are obtained by dissolving Al 2 O 3 or Al(OH) 3 in diluted phosphoric acid solutions. Such solutions, characterised by their P/Al molar ratio, their phosphorus concentration [P], and the presence of additives, have also been widely investigated [ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 ]. By heating, the alumino-phosphate species of the solutions react to form hydrated alumino-phosphate compounds (Al(H 2 PO 4 ) 3 , × H 2 O and AlH 2 P 3 O 10 , × H 2 O) around 150–350 °C.…”

Section: Introductionmentioning

confidence: 99%

Effect of the P/Al Molar Ratio and Heating Rate on the Composi-Tion of Alumino-Phosphate Binders

Tricot

Beaussart

et al. 2022

Materials

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New insights into the chemistry of alumino-phosphate solutions are provided in this contribution. In a first part, a solution with a P/Al molar ratio of 3.2 was prepared for the first time. The binders obtained at 500 and 700 °C were compared to those obtained with the 3 and 3.5 P/Al molar ratio solutions in order to determine the impact of moderate P2O5 excess on the final phosphate ceramic nature. In a second part, the widely used P/Al=3 solution was heat-treated at 500 °C using different heating rates (0.2, 1, and 10 °C/min) to determine how this parameter modifies the final phosphate ceramic composition. Our data show that moderate P2O5 excess is sufficient to obtain binders with a high amount of stable cubic aluminium metaphosphate compound at 700 °C but not at 500 °C, where significant P2O5 excess is mandatory. We also show that slow heating favors the formation of cubic aluminium metaphosphate compound at 500 °C.

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“…Sealing treatment is deemed as an efficient and attractive method on overcoming the disadvantage of plasma spray coating (PSC) mentioned above [5][6][7][8]. In general, there are two sorts of sealing materials [7,[9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Plasma Sprayed Al ₂o₃-13 Wt.%tio₂ Coating Sealed With Organic-Inorganic Hybrid Agent and Its Corrosion Resistance in Acid Environment

Zhou¹

2016

Ceramics - Silikaty

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A novel organic-inorganic hybrid material of γ-methacryloxypropyltrime-thoxysilane (KH570)-SiO 2 was fabricated by Sol-Gel method. The hybrid material was used as the sealing agent for the plasma sprayed Al 2 O 3 -13 wt. % TiO 2 coating. Infrared spectrum and grafted mechanism of the hybrid agent (HA) were studied. Moreover, morphology and porosity, as well as characteristics of immersion plus electrochemical corrosion in acid environment of the coating with and without sealing treatment were evaluated, compared with those of the coating sealed with the conventional silicone resin agent (SRA). The results reveal that KH570 was successfully grafted onto the surface of SiO 2 . The HA film sealed on the surface of the coating presents a little better quality than the SRA film. The porosities of the coatings after the sealing treatment decreased. Furthermore, the sealing treatment can improve efficiently the corrosion resistance of the coating in 5 vol. % HCl solution. The hybrid sealing agent can become a candidate for the plasma sprayed Al 2 O 3 -13 wt. % TiO 2 coating used in acid environment to overcome some disadvantages of organic agents such as severely environmental pollution.

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Structural characterization of an electrically insulating diffusion barrier on a plasma-sprayed ceramic for severe environment applications

Cited by 12 publications

References 6 publications

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

Effect of the P/Al Molar Ratio and Heating Rate on the Composi-Tion of Alumino-Phosphate Binders

Plasma Sprayed Al ₂o₃-13 Wt.%tio₂ Coating Sealed With Organic-Inorganic Hybrid Agent and Its Corrosion Resistance in Acid Environment

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