Study on influence of porosity, pore size, spatial and topological distribution of pores on microhardness of as plasma sprayed ceramic coatings

Venkataraman, R.; Das, Gautam; Singh, Sandeep; Pathak, L C; Ghosh, Ranajoy; Venkataraman, B.; Krishnamurthy, R.

doi:10.1016/j.msea.2006.09.042

Cited by 70 publications

(37 citation statements)

References 10 publications

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“…In this case, the local fields play the main role in the process and modification of these fields by clustering is of primary importance. Similar effects have been observed in porous materials (Venkataraman et al, 2007). Chen and Papathanasiou (2004) used boundary element method to study peak stresses in fiber reinforced composites and concluded that the key parameter for the interface stresses is the inter-fiber distance.…”

Section: Introductionsupporting

confidence: 53%

Effect of pore distribution on the statistics of peak stress and overall properties of porous material

Sevostianov

Кущ

2009

International Journal of Solids and Structures

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a b s t r a c tThis paper addresses the effect of pore distribution on the overall properties and local stress fields in a porous material. Thermal and elastic fields in materials with uniform microstructure are compared with those of materials containing distinguishable clusters of circular or elliptic shape. The numerical simulation combines multipole expansion of local fields with the multi-particle unit cell method. Our work demonstrates that statistics of the peak stresses follow Gumbel's rule derived for statistics of extreme values and are directly related to statistics of nearest neighbors. Based on this correspondence, an analytical expression for statistics of maximal stresses in a porous material with arbitrary microstructure is constructed in terms of porosity and statistics of minimal distances between the nearest neighbors. At the same time, the numerical analysis indicates that overall elastic constants and thermal (or electrical) conductivity are almost insensitive to the actual distribution of pores -uniform or with distinguishable pore clusters -at least in the examined interval of porosity (up to 50%).

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Section: Introductionsupporting

confidence: 53%

Effect of pore distribution on the statistics of peak stress and overall properties of porous material

Sevostianov

Кущ

2009

International Journal of Solids and Structures

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“…Consequences of this, the gas escape resulting in escalating gas pressure in the splat centre during rapid spreading and quenching of splats. Extremely very high arc current settings may result in vaporization of particles [17].…”

Section: Methodology and Materialsmentioning

confidence: 99%

“…Generally, both hardness and porosity content were related where coating with high content porosity produced varied hardness properties [17]. Excessive porosity content influenced structural integrity of coating.…”

Section: Introductionmentioning

confidence: 99%

Thermal Barrier Coatings on Laser Surface Modified AISI H13 Tool Steel Using Atmospheric Plasma Spray Technique

Reza

Aqida

Toff

et al. 2013

KEM

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This paper presents yttria-stabilized zirconia (YSZ) coating deposition on laser surface modified H13 tool steel using atmospheric plasma spray (APS) technique. A Praxair Plasma Spray System with SG-100 gun was used to deposit coating materials on laser-modified H13 tool steel substrate surface. A bond coat layer material was NiCrAlY alloy while the top coat was yttria stabilized zirconia (YSZ) with powder size distribution range of -106 µm to +45 µm. A 2 3 design of experiment (DOE) was used to deposit bond coat and top coat powders with three controlled factors of input current, powder feed rate and stand-off-distance. The design was optimised for minimum porosity and maximum hardness. The coating thickness and percentage of porosity were measured using IM7000 inverted optical microscope. Hardness properties of top coating layer were measured by using MMT-X7 Matsuzawa Hardness Tester Machine with vickers hardness scale. The microscopy findings indicated variations of coating thickness at different parameters settings. Samples at the highest current and powder feed rate and lowest stand-off distance settings produced a lower porosity percentage and higher hardness. A higher powder feed rate with the smallest stand-off-distance allowed melted powders to travel uniformly onto the substrate surface. These findings were significant to development of thermal barrier coatings on semi-solid forming die surface.

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“…Also they show that, when the powder feed rate is relatively low, the existence of the micro-cracks in the coating influenced micro hardness. Several studies [11][12][13] reported the effects of plasma spray parameters on porosity and micro hardness of coatings, too.…”

Section: Introductionmentioning

confidence: 99%

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

2017

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In the present paper, our aims are the investigation of the effects of the spray parameters of the aluminum-coated layer on the microstructure and mechanical properties. For this purpose, we use the self-generated atmospheric plasma spray system for coating of aluminum on the carbon steel substrate to protect it against corrosion degradation. This system allows us to achieve the best choice for parameters. In this paper, the effects of spray distance and argon flow rate on the characteristics of aluminum coating are investigated. To obtain the results, the analyses are used such as X-ray diffraction, scanning electron microscope, micro hardness of the coating by Vickers method, and adhesion strength behaviors by pulloff test. The results show that the porosity increases with increasing distance. This phenomenon reduces the hardness and adhesion, which is clearly evident in our results. The other important conclusion is that, if the gas flow rate increases, the porosity decreases. It is shown that the best adhesion strength is obtained at the special value of the spraying distance.

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Study on influence of porosity, pore size, spatial and topological distribution of pores on microhardness of as plasma sprayed ceramic coatings

Cited by 70 publications

References 10 publications

Effect of pore distribution on the statistics of peak stress and overall properties of porous material

Effect of pore distribution on the statistics of peak stress and overall properties of porous material

Thermal Barrier Coatings on Laser Surface Modified AISI H13 Tool Steel Using Atmospheric Plasma Spray Technique

The investigation of the microstructure behavior of the spray distances and argon gas flow rates effects on the aluminum coating using self-generated atmospheric plasma spray system

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