Preparation of agglomerated powders for air plasma spraying MoSi2 coating

Yan, Jianhui; Juan, Xu; Rafi-Ud-Din, .; Wang, Yi; Liu, Longfei

doi:10.1016/j.ceramint.2015.04.149

Cited by 26 publications

(12 citation statements)

References 24 publications

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“…Furthermore, particle morphology is an inherent source of controlling porosity in the coating 14 . Internal porosity of powders such as dimpled and hollowed particles was found to affect the final properties of coating 60 . In our study, SEM images in Fig.…”

Section: Discussionmentioning

confidence: 99%

Improving wear resistance of plasma-sprayed calcia and magnesia-stabilized zirconia mixed coating: roles of phase stability and microstructure

Hafez

Akila

Khedr

et al. 2020

Sci Rep

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The phase stability and microstructure of ZrO2–5CaO and ZrO2–24MgO mixed coating (wt%) by air plasma spraying on 304 stainless steel substrates were investigated. A Ni–5Al (wt%) metallic bond coating was firstly sprayed between the substrate and the ceramic top layer. The results were compared with the individual coatings of ZrO2–5CaO and ZrO2–24MgO for a better understanding of the correlation between their microstructures and mechanical properties. Mixed zirconia coating was found to have a mixture of cubic and tetragonal phases that stabilized under different plasma spray conditions. Microscopic observations and elemental composition analysis of as-sprayed mixed coating showed that modified ceramic-matrix grains had been formed. Microsized ZrO2–5CaO particles were embedded in the matrix grain creating an intragranular microstructure. Results indicated that ceramic-matrix grains provided a diffusion barrier for the growth of oxides induced stress near and onto the bond layer that reduced cracks, thereby overcoming the top delamination of the ceramic coating. Moreover, disparity in wear resistance and microhardness behavior of the coatings was influenced by initial feedstock powder and matrix microstructures. Improvement in the wear resistance of the mixed zirconia coating was attributed to a decrease in oxide content, which resulted in an increase in intersplat cohesive strength.

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Section: Discussionmentioning

confidence: 99%

Improving wear resistance of plasma-sprayed calcia and magnesia-stabilized zirconia mixed coating: roles of phase stability and microstructure

Hafez

Akila

Khedr

et al. 2020

Sci Rep

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“…To collect particles in-flight before impinging onto the substrate, an experimental apparatus was developed (as illustrated in Figure 2). During the SAPS process, YSZ particles in-flight were rapidly solidified and collected in a collection apparatus containing liquid nitrogen in which the cooling rate of the spraying particles exceeded 10 6 K/s that enabled a rapid cooling rate [19]. Furthermore, liquid nitrogen, an inert cooling medium, was used to prevent chemical reaction from occurring between the YSZ particles in-flight and the cooling medium.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Physicochemical Properties of Yttria-Stabilized-Zirconia In-Flight Particles during Supersonic Atmospheric Plasma Spray

Guo¹,

He²,

Chen

et al. 2019

Coatings

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In order to achieve better knowledge of the thermal barrier coatings (TBCs) by supersonic atmospheric plasma spraying (SAPS) process, an experimental study was carried out to elaborate the physicochemical properties of particles in-flight during the SAPS process. One type of commercially available agglomerated and sintered yttria-stabilized-zirconia (YSZ) powder was injected into the SAPS plasma jet and collected by the shock chilling method. The YSZ particles’ in-flight physicochemical properties during the SAPS process, including melting state, morphology, microstructure, particle size distribution, element composition changes, and phase transformation, have been systematically analyzed. The melting state, morphology, and microstructure of the collected particles were determined by scanning electron microscopy (SEM). The particle size distribution was measured by a laser diffraction particle size analyzer (LDPSA). Element compositions were quantitatively analyzed by an electron probe X-ray microanalyzer (EPMA). Additionally, the X-ray diffraction (XRD) method was used to analyze the phase transformation. The results showed that the original YSZ powder injected into the SAPS plasma jet was quickly heated and melted from the outer layer companied with breakup and collision-coalescence. The outer layer of the collected particles containing roughly hexagonal shaped grains exhibited a surface texture with high sphericity and the inside was dense with a hollow structure. The median particle size had decreased from 45.65 to 42.04 μm. In addition to this, phase transformation took place, and the content of the zirconium (Zr) and yttrium (Y) elements had decreased with the evaporation of ZrO2 and Y2O3.

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“…2). During the SAPS process, YSZ particles in-flight were rapidly solidified and collected in a collection apparatus containing liquid nitrogen in which the cooling rate of the spraying particles exceeds 10 6 K/s that enables a rapid cooling rate [19]. while the voltage and electric current were held at 40 kV and 30 mA, respectively.…”

Section: Experimental Materials and Methodsmentioning

confidence: 99%

Physicochemical Properties of Yttria-Stabilized-Zirconia In-Flight Particles During Supersonic Atmospheric Plasma Spray

Guo¹,

Chen²,

Kang³

et al. 2019

Preprint

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In order to achieve better knowledge of the thermal barrier coatings (TBCs) by supersonic atmospheric plasma spraying (SAPS) process, an experimental study was carried out to elaborate physicochemical properties of particles in-flight during the SAPS process. One type of commercially available agglomerated and sintered yttria-stabilized-zirconia (YSZ) powders were injected into the SAPS plasma jet and collected by shock chilling method. The YSZ particles in-flight physicochemical properties of the melting state, morphology, microstructure, particle size distribution, element composition changes and phase transformation during the SAPS process have been systematically analyzed. The melting state, morphology and microstructure of the collected particles were determined by scanning electron microscopy (SEM). The particle size distribution was measured by a laser particle size analyzer (LPSA). Element compositions were quantitatively analysed by an electron probe X-ray microanalyzer (EPMA). Additionally, the X-ray diffraction (XRD) method was used to analyse the phase transformation. The results showed that the original YSZ powders injected into the SAPS plasma jet were quickly heated and melted from the outer layer companied with breakup and collision-coalescence. The outer layer of the collected particles containing roughly hexagonal shaped grains exhibited a surface texture with high sphericity and the inside was dense with hollow structure. The median particle size was decreased from 45.65 μm to 42.04 μm. Besides, phase transformation took place and the content of zirconium (Zr) and yttrium (Y) element was decreased with the evaporation of ZrO2 and Y2O3.

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Preparation of agglomerated powders for air plasma spraying MoSi2 coating

Cited by 26 publications

References 24 publications

Improving wear resistance of plasma-sprayed calcia and magnesia-stabilized zirconia mixed coating: roles of phase stability and microstructure

Improving wear resistance of plasma-sprayed calcia and magnesia-stabilized zirconia mixed coating: roles of phase stability and microstructure

Physicochemical Properties of Yttria-Stabilized-Zirconia In-Flight Particles during Supersonic Atmospheric Plasma Spray

Physicochemical Properties of Yttria-Stabilized-Zirconia In-Flight Particles During Supersonic Atmospheric Plasma Spray

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