Microstructure and properties of laser treated arc sprayed and plasma sprayed coatings

Pokhmurska, A.; Ciach, R.

doi:10.1016/s0257-8972(99)00614-3

Cited by 17 publications

(7 citation statements)

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“…Laser treatment of ceramic coatings provides a better coating structure, and reduced porosity, which in turn offers a positive influence on the mechanical and corrosion properties of coatings [15]. The presence of porosity and microcracks as observed for the coated specimen shown in Fig.…”

Section: Effect Of Laser Meltingmentioning

confidence: 78%

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Shankar

Mudali

Sole

et al. 2008

Journal of Nuclear Materials

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Section: Effect Of Laser Meltingmentioning

confidence: 78%

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Shankar

Mudali

Sole

et al. 2008

Journal of Nuclear Materials

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“…In other words, the wear resistance of the laser remelting layer was 2-3 times of the plasma spraying layer. The reason is because laser remelting eliminates the structural nonuniformity, loose structure, pores, and other defects of the plasma spraying layer [40][41][42][43][44][45][46][47]. In addition, uniform, dense, and small isometric crystals are gained, thus increasing the hardness of the coating significantly.…”

Section: Frictional Wear Test Resultsmentioning

confidence: 99%

Surface modification of plasma spraying A_l2O₃–13 wt% TiO₂ coating by laser remelting technique

Zhou

Zheng

et al. 2022

Mater. Res. Express

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An Al2O3-13 wt.% TiO2 composite ceramic coating was prepared on the TiAl alloy surface by plasma spraying and laser remelting combined technique. The morphology, microstructure, and phase composition of the prepared coating were analyzed by scanning electron microscopy, energy disperse spectroscopy, and X-ray diffraction. The bonding strength, microhardness, wear resistance, erosion resistance, and thermal shock resistance of the coating were also tested. Results demonstrated that after processing by laser remelting, the particles on the ceramic coating surface were refined, lamellar structure disappeared, and density increased. A remelting layer basically without crack and other defects was gained. Due to laser remelting, the metastable-phase γ-Al2O3 was converted into stable-phase α-Al2O3. Influenced by the low thermal conductivity of ceramic materials, remelting of the whole ceramic layer is impossible to realize during laser remelting. The remelted ceramic coating formed the isometric crystal remelting zone with small grain size, sintering zone, and lamellar residual plasma spraying zone. The bonding strength and microhardness of the coating improved significantly after laser remelting, and the wear resistance, erosion resistance, and thermal shock resistance were significantly superior to those of the original plasma spraying layer. Laser remelting specimens still represented typical brittle erosion characteristics. Cracks initiated and expanded on near surface, finally leading to breakage of the remelting layer, mainly manifested by grain peeling. With respect to thermal shock failure mode, the corner peeling is the major failure mode of the ceramic coating after plasma spraying. Differently, corner peeling and considerable local peelings were found at the center of the ceramic coating after laser remelting. The influences of laser remelting on the thermal shock performances of the coating are mainly manifested as the decreased initial failure resistance, decelerated crack expansion, and changes in failure modes of the coating.

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“…The remelting of coatings can be carried out using: laser beam [140,141], electron beam [142,143], and, electric arc [144,145]. The laser treatment that is most frequently used is described in detail in [146].…”

Section: Heat Treatmentmentioning

confidence: 99%

Review of Functionally Graded Thermal Sprayed Coatings

et al. 2020

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The paper briefly describes major thermal spray techniques used to spray functionally graded coatings such as atmospheric plasma spraying, high velocity oxy-fuel spraying, suspension and solution precursor plasma spraying, and finally low and high pressure cold gas spray method. The examples of combined spray processes as well as some examples of post spray treatment including laser and high temperature treatments or mechanical one, are described. Then, the solid and liquid feedstocks used to spray and their properties are shortly discussed. The reviewed properties of functional coatings include: (i) mechanical (adhesion, toughness, hardness); (ii) physical (porosity, thermal conductivity and diffusivity, thermal expansion, photo-catalytic activity), and; (iii) bioactivity and simulated body fluid (SBF) corrosion. These properties are useful in present applications of functionally graded coatings as thermal barriers, the bioactive coatings in prostheses, photo-catalytic coatings in water treatment, coatings used in printing industry (anilox and corona rolls). Finally, some of the future possible fields of functional thermal sprayed coatings applications are discussed, e.g., to coat polymer substrates or to use the cheap technology of low pressure cold gas spray method instead of expensive technology of vacuum plasma spraying to obtain bond coatings.

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Microstructure and properties of laser treated arc sprayed and plasma sprayed coatings

Cited by 17 publications

References 0 publications

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Surface modification of plasma spraying A_l2O₃–13 wt% TiO₂ coating by laser remelting technique

Review of Functionally Graded Thermal Sprayed Coatings

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Microstructure and properties of laser treated arc sprayed and plasma sprayed coatings

Cited by 17 publications

References 0 publications

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Plasma-sprayed yttria-stabilized zirconia coatings on type 316L stainless steel for pyrochemical reprocessing plant

Surface modification of plasma spraying Al2O3–13 wt% TiO2 coating by laser remelting technique

Review of Functionally Graded Thermal Sprayed Coatings

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Surface modification of plasma spraying A_l2O₃–13 wt% TiO₂ coating by laser remelting technique