Microstructure and photocatalytic activity of APS coatings obtained from different TIO2 nanopowders

Bordes, M. Carmen; Vicent, M.; Moreno, A.; Moreno, Rodrigo; Borrell, Amparo; Salvador, M. D.; Sánchez, E.

doi:10.1016/j.surfcoat.2012.08.059

Cited by 18 publications

(29 citation statements)

References 31 publications

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“…Thus no direct comparison can be done between this feedstock and the corresponding spray-dried powders. The agglomerate density of the two powders obtained in this research is much higher than that of the NC sample as a consequence of the better packing efficiency inside the agglomerate associated with the submicronic-nanometric particle arrangement [12]. Moreover, the Hausner ratio for the three spray-dried powders was ≤ 1.25, indicating good flowability and confirming that they are appropriate for APS process.…”

Section: Feed Powder Agglomeration Processmentioning

confidence: 57%

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

Vicent

Bannier

Moreno

et al. 2013

Journal of the European Ceramic Society

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Section: Feed Powder Agglomeration Processmentioning

confidence: 57%

“…In this respect, we have also recently reported improved photocatalytic activity in APS TiO 2 coatings when using a mixture of nano and submicrometric particles in the spray-dried feedstock. Much higher density agglomerates were obtained which led to better properties in the final coatings [11,12].…”

Section: Introductionmentioning

confidence: 99%

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

Vicent

Bannier

Moreno

et al. 2013

Journal of the European Ceramic Society

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“…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%

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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“…This was again attributed to preservation of the anatase phase, elimination of powder impurities (e.g., organic binders), and cleaning of the particle surfaces when crossing the plasma. Other authors have also pointed out that the decrease of the photocatalytic efficiency of APS TiO 2 coatings was caused by loss of anatase, although the degradation of many different contaminants has been studied (Ref [55][56][57][58].…”

Section: Photocatalytic Degradation Of Contaminantsmentioning

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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Microstructure and photocatalytic activity of APS coatings obtained from different TIO2 nanopowders

Cited by 18 publications

References 31 publications

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

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

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

Milestones in Functional Titanium Dioxide Thermal Spray Coatings: A Review

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