Microstructures of nanostructured ceramic coatings obtained by suspension thermal spraying

Toma, Filofteia-Laura; Berger, Lutz‐Michael; Naumann, T.; Langner, Stefan

doi:10.1016/j.surfcoat.2008.04.007

Cited by 39 publications

(23 citation statements)

References 5 publications

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“…It seems that the plasma jet did not contain sufficient energy to induce transformation of the anatase particles in-flight, because a very high ratio of anatase phase (90% at a stand-off distance of 13 cm) was preserved in the coating. This phenomenon was also reported by Toma et al during plasma spray and HVOF spray deposition of water-based suspensions of TiO 2 (Ref 28,30,31,37) and by Kozerski and co-workers during the plasma-spray deposition of waterbased hydroxyapatite suspension ( Ref 26,38). After deposition, the heat treatment by the plasma torch began to have an effect on phase transformation.…”

Section: Peer Reviewedsupporting

confidence: 71%

Titanium Dioxide Coating Prepared by Use of a Suspension-Solution Plasma-Spray Process

Coyle

Chien

et al. 2015

J Therm Spray Tech

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Titanium dioxide coatings were prepared from titanium isopropoxide solution containing nano TiO 2 particles by use of a plasma-spray process. The effects of stand-off distance on coating composition and microstructure were investigated and compared with those for pure solution precursor and a water-based suspension of TiO 2 . The results showed that the anatase content of the coating increased with increasing stand-off distance and the rate of deposition decreased with increasing spray distance. Anatase nanoparticles in solution were incorporated into the coatings without phase transformation whereas most of the TiO 2 in the precursor solution was transformed into rutile. The microstructure of preserved anatase particles bound by rutile improved the efficiency of deposition of the coating. The amount of anatase phase can be adjusted by variation of the ratio of solution to added anatase TiO 2 nanoparticles.

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Section: Peer Reviewedsupporting

confidence: 71%

Titanium Dioxide Coating Prepared by Use of a Suspension-Solution Plasma-Spray Process

Coyle

Chien

et al. 2015

J Therm Spray Tech

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“…The larger size distribution was due to formation of agglomerates in the manufacturing process (i.e., additives to stabilise the suspension). The suspension was sprayed onto stainless steel substrates of dimensions 60×25×2 mm 3 .…”

Section: Methodsmentioning

confidence: 99%

“…which was recalculated into weight fraction using 3.78 g/cm 3 and 4.23 g/cm 3 for densities of anatase and rutile respectively.…”

Section: Coating Characterizationmentioning

confidence: 99%

“…The contributions of this technique towards production of coatings with low thermal conductivities [2], unique microstructural features such as high specific surface area [3] or simply thin coatings to bridge the gap between traditional thin film and conventional thermal sprayed coatings have already been demonstrated. There are still many opportunities for further expansion of suspension based thermal sprayed coatings and to understand the relationships between processing parameters and microstructure [4].…”

Section: Introductionmentioning

confidence: 99%

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Suspension high velocity oxy-fuel spraying of TiO 2 : A quantitative approach to phase composition

Pala

Shaw

Murray

et al. 2017

Journal of the European Ceramic Society

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A range of coatings from water suspension of anatase has been prepared by suspension high velocity oxy-fuel spraying with the aim to study effects of heat power of the flame on phase composition, microstructure and surface topography. Three most commonly used approaches of quantitative phase analysis have been scrutinized with respect to their applicability and as some of the coatings showed presence of preferred orientation it was argued that quantitative Rietveld refinement is the most accurate method for phase composition determination. Coatings had a layered duplex anatase/rutile microstructure with fraction of rutile increasing exponentially with heat power. Spraying at the lower heat power led to a lower surface roughness and higher power resulted in surfaces with pronounced humps, which were distributed homogeneously on the surface. The emergence of humps is related to an increase in macroscopic surface area of up to 30 % with respect to the flat coating.

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“…This allows for developing components with optimized surface behavior using cheaper or more processable materials, like mild carbon steel. Different coating alternatives of carbon steel can be found in the literature: stainless steel, [1,2] 100Cr6 steel, [3,4] Mo, [5,6] organic coatings, [7,8] ceramic coatings, [9,10] and WC-Co. [11,12] Thermal spray is a technique that produces a wide range of these coatings for diverse applications. The principle of thermal spray is to melt material feedstock (wire or powder) to accelerate the melt to impact on a substrate where rapid solidification and deposit build-up occurs.…”

mentioning

confidence: 99%

Microstructural and Mechanical Properties of Ni-Base Thermal Spray Coatings Deposited by Flame Spraying

Bradai

Sadeddine

Mouadji

et al. 2011

Metall Mater Trans B

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In this work, two different Ni-base powders, namely, ProXon 21021 (P21) and ProXon 21031 (P31), were sprayed onto a steel substrate 35CrMo4 using a thermal flame spray technique. The morphology and chemical composition of the phases that are present in the powders and coatings were characterized by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS). The hardness and wear resistance of the coatings were investigated. The XRD analysis revealed that the phases present in the coatings are different from the initial powders. In addition, some inhomogeneities such as oxides, porosity, and unmelted particles were observed by SEM. It was found that the P31 spray-coated exhibited higher microhardness, higher wear resistance, and significantly lower friction coefficient in comparison with those of P21 coatings.The use of coatings is one of the most effective strategies to protect materials against corrosion and to increase the wear resistance of materials. This allows for developing components with optimized surface behavior using cheaper or more processable materials, like mild carbon steel. Different coating alternatives of carbon steel can be found in the literature: stainless steel, [1,2] 100Cr6 steel, [3,4] Mo, [5,6] organic coatings, [7,8] ceramic coatings, [9,10] and WC-Co. [11,12] Thermal spray is a technique that produces a wide range of these coatings for diverse applications. The principle of thermal spray is to melt material feedstock (wire or powder) to accelerate the melt to impact on a substrate where rapid solidification and deposit build-up occurs. [13] Thermal spraying uses two principal energy sources, chemical energy of the combusting gases that power the flame spray torches (e.g., high velocity oxygen fuel (HVOF) spraying) and electric currents providing energy for the plasmatons (e.g., atmospheric plasma spraying (APS)). All these techniques allow for the deposition of coating on materials generally ductile to improve their corrosion and wear resistance. Nevertheless, more traditional electric arc wire spray and combustion flame spray are still widely used. [14][15][16][17] The flame spray deposition technique has several disadvantages compared with the HVOF or APS methods, including a bigger grain size microstructure, pore size, and crack length, but it also has certain advantages, such as its being more economical, easier to handle, and more adaptable to the manufacturing process with a short series or recovery of pieces. Flame spray was the first thermal spray process developed. Modern torches have changed, and the high particle velocities are in the range of 200-300 m/s. Oxyacetylene torches are using acetylene as the main fuel in combination with oxygen to generate high combustion temperatures and particle temperatures around 2873 K (2600°C). [13] In recent years, thermally sprayed nickel-based alloys are used in a variety of applications, e.g., as bond coats for thermal barrier coatings on turbine components, as restorative layers for mach...

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Microstructures of nanostructured ceramic coatings obtained by suspension thermal spraying

Cited by 39 publications

References 5 publications

Titanium Dioxide Coating Prepared by Use of a Suspension-Solution Plasma-Spray Process

Titanium Dioxide Coating Prepared by Use of a Suspension-Solution Plasma-Spray Process

Suspension high velocity oxy-fuel spraying of TiO 2 : A quantitative approach to phase composition

Microstructural and Mechanical Properties of Ni-Base Thermal Spray Coatings Deposited by Flame Spraying

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