Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Vicent, M.; Bannier, É.; Moreno, Rodrigo; Salvador, M. D.; Sánchez, E.

doi:10.1016/j.jeurceramsoc.2013.05.009

Cited by 23 publications

(33 citation statements)

References 28 publications

(57 reference statements)

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“…The optimal amount of dispersant was used and different sonication times were employed. Subsequently a bimodal (50% nanopowder/50% submicron-sized powder) suspension with the same solid content was prepared following the procedure set out elsewhere [13]. The following references were used to name the suspension feedstocks: 100% nanoparticles (Yn), 100% submicron-sized particles (Ys) and 50% nano/50% submicron-sized powder (Ysn).…”

Section: Suspensions Preparation and Characterisationmentioning

confidence: 99%

“…The rheological behaviour of some concentrated suspensions was determined using a rotational rheometer (Mars, Thermo Haake Co., Thermo, Germany) operating at controlled shear rate (CR) by uploading the shear rate from 0 to 1000 s -1 in 300 s, maintaining at 1000 s -1 for 60 s and downloading from 1000 to 0 s -1 in 300 s. The measurements were carried out at 25 ºC using a double-cone and plate system [13].…”

Section: Suspensions Preparation and Characterisationmentioning

confidence: 99%

“…X-ray diffraction patterns were collected to identify crystalline phases in coating samples (Bruker, ThetaTheta D8 Advance, Germany). Coatings porosity as well as the amount of semi-molten partially melted areas were estimated by image analysis at 5000x magnifications from SEM pictures following a procedure set out elsewhere [13]. Limitations of this technique to estimate very small (few hundreds of nanometers) pores were assumed [14].…”

Section: Coating Deposition and Characterisationmentioning

confidence: 99%

“…With this information concentrated aqueous suspensions of 10 vol.% (Yn, Ys and Ysn) were prepared which exhibited adequate rheological behaviour and stability so as to be injected into the plasma plume without sedimentation or clogging problems. The procedure to prepare these concentrated suspensions has been reported elsewhere [13].…”

Section: Coating Deposition and Characterisationmentioning

confidence: 99%

“…higher solids content and lower viscosity leading to better feeding in the plasma torch along with higher deposition efficiency [4]. Besides some coatings properties can be improved when using bimodal feedstock as recently reported for APS coatings [8,9]. However, the use of these bimodal powders has not been treated in SPS literature.…”

Section: Introductionmentioning

confidence: 99%

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Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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Estimation of the length of the manuscript (the pages of the manuscript should be numbered) Number of words Please fill outPlease fill out Length of the text 1) (using "word count") 3716 Number of Tables 1 × 150 3) Total number of words: 4000 words for a contributed paper (oral and posters), 8000 words for an invited paper and plenary paper. Manuscripts exceeding these word limits will not be considered for publication in the Proceedings volume. These too long papers could be submitted to the Editor of the journal for publication as regular papers. AbstractIn this work, aqueous suspensions feedstocks with different particle size distribution from submicron-and nano-sized YSZ powders were prepared. A previous colloidal characterisation allowed concentrated suspensions (~40 wt%) to be prepared. These suspensions were then successfully deposited by suspension plasma spraying (SPS) onto stainless steel substrates at different spraying distances. Coatings were characterised in terms of microstructure and mechanical properties (hardness and elastic modulus) by nanoindentation.All coatings displayed a two-zones microstructure formed by partially molten melted areas containing nanometer or submicrometer-sized particles surrounded by fully molten melted areas. These partially molten melted areas strongly increased as standoff distance lengthened. Mechanical properties worsened with spraying distance increase.The finer the feedstock particle size the more the spraying distance effect was. A clear correlation between mechanical properties and amount of partially molten melted areas has been proved. Thus the use of a mixture of nano/submicron-sized particles as a SPS feedstock can represent a good balance between suspension processability and final coating performance.

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Section: Suspensions Preparation and Characterisationmentioning

confidence: 99%

Section: Suspensions Preparation and Characterisationmentioning

confidence: 99%

Section: Coating Deposition and Characterisationmentioning

confidence: 99%

Section: Coating Deposition and Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Carpio

Bannier

Salvador

et al. 2015

Surface and Coatings Technology

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Multilayer and Particle Size-Graded YSZ Coatings Obtained by Plasma Spraying of Micro- and Nanostructured Feedstocks

et al. 2014

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Revista:Journal of Thermal Spray Technology AbstractThis study was undertaken to attempt to achieve a better balance between zirconia coating properties and high-temperature performance by combining the characteristics of coatings obtained from a micro-and a nanostructured feedstock having the same YSZ composition. First, two single-layer coatings were obtained as reference coatings, using the micro-and the nanostructured feedstock, respectively. Four different composite coatings were then obtained by combining these two feedstocks. Two double-layer (multilayer) YSZ coatings were prepared by depositing the microstructured feedstock on the nanostructured layer and vice versa, while two coatings with different particle size gradients (graded coatings) were prepared by depositing various mixtures of the micro-and the nanostructured feedstock in alternate layers.The microstructure and hardness of the resulting coatings were determined. In the multilayer coatings, each layer exhibited a clearly different microstructure, whereas in the graded coatings the microstructural characteristics changed gradually. Coating hardness developed analogously, each layer displaying a marked change in hardness in the multilayer coatings in contrast to a gradual change in the graded coatings. The microstructure and hardness of the individual layers were thus quite well preserved in the developed composite coatings.

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A fast pressureless sintering method for transparent AlON ceramics by using a bimodal particle size distribution powder

Shan

Guang

et al. 2015

Ceramics International

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Atmospheric plasma spraying coatings from alumina–titania feedstock comprising bimodal particle size distributions

Cited by 23 publications

References 28 publications

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Effect of particle size distribution of suspension feedstock on the microstructure and mechanical properties of suspension plasma spraying YSZ coatings

Multilayer and Particle Size-Graded YSZ Coatings Obtained by Plasma Spraying of Micro- and Nanostructured Feedstocks

A fast pressureless sintering method for transparent AlON ceramics by using a bimodal particle size distribution powder

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