Fabrication and evaluation of plasma sprayed nanostructured alumina–titania coatings with superior properties

Jordan, Eric H.; Gell, Maurice; Sohn, Yong Ho; Goberman, Daniel; Shaw, Leon L.; Jiang, Stephen; Wang, M; Xiao, T. D.; Wang, Y; Strutt, P. R.

doi:10.1016/s0921-5093(00)01382-4

Cited by 233 publications

(118 citation statements)

References 18 publications

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“…11 and 16)a r e uniformly spread throughout the coating microstructure, acting as crack arresters, toughening the coating. Such a toughening mechanism was suggested by references [9,10,24,25] in a study of mechanical properties of nanostructured related ceramic thermal spray coatings.…”

Section: Hardness Crack Propagation Resistance and Coating Isotropymentioning

confidence: 81%

“…These characteristics open interesting possibilities in thermal spray. Indeed, it has already been shown that nanostructured thermal spray ceramic oxide coatings, like Al 2 O 3 -TiO 2 and TiO 2 , can have a superior wear performance when compared to similar coatings produced from conventional ceramic oxide pow- ders [9][10][11]. However, in other cases, authors have not observed this same improvement in the wear behavior when using nanostructured feedstocks [12].…”

Section: Introductionmentioning

confidence: 99%

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From APS to HVOF spraying of conventional and nanostructured titania feedstock powders: a study on the enhancement of the mechanical properties

Lima

Marple

2006

Surface and Coatings Technology

116

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From APS to HVOF spraying of conventional and nanostructured titania feedstock powders : A study on the enhancement of the mechanical properties Lima, R. S.; Marple, B. R. Abstract Nanostructured and conventional titania (TiO 2 ) feedstocks were thermal sprayed using air plasma spray (APS) and high-velocity oxy-fuel (HVOF). The HVOF-sprayed coatings made from the nanostructured feedstock exhibited superior abrasion resistance, bond strength and crack propagation resistance when compared to the coatings made from the conventional feedstocks sprayed using HVOF and APS. The enhancement of the mechanical properties was due to (i) the processing (HVOF) and (ii) the nanocharacter of the feedstock. It was found that the HVOF-sprayed coating made from the nanostructured feedstock exhibited isotropic characteristics and microstructure with tiny zones of agglomerated nanostructured particles randomly spread throughout the coating structure. It was observed that these nanostructured zones acted as crack arresters by blunting and branching crack tips, enhancing the crack propagation resistance of the coating. Due to the isotropic characteristics of mechanical properties, the HVOF-sprayed coating made from the nanostructured feedstock exhibited uniform crack propagation under Vickers indentation, i.e., four cracks emanating from the corners of the Vickers indentation impression. D

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Section: Hardness Crack Propagation Resistance and Coating Isotropymentioning

confidence: 81%

Section: Introductionmentioning

confidence: 99%

From APS to HVOF spraying of conventional and nanostructured titania feedstock powders: a study on the enhancement of the mechanical properties

Lima

Marple

2006

Surface and Coatings Technology

116

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“…The nanoscale microstructure can be retained in the coatings despite the high temperatures and melting involved in forming a dense coating. Plasma spraying [393][394][395][396][397][398][399] and HVOF spraying [400][401][402][403] of nanostructured feedstock powders of metals or ceramics proved to be potential methods to form nanocrystalline coatings. The HVOF method is preferred to plasma spraying because of its higher droplet velocity and lower thermal energy levels, yielding denser structure, and higher bond strength between the coating and the substrate.…”

Section: Thermal Sprayed Coatingsmentioning

confidence: 99%

Nanocrystalline materials and coatings

Tjong

Chen

2004

Materials Science and Engineering: R: Reports

842

345

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In recent years, near-nano (submicron) and nanostructured materials have attracted increasingly more attention from the materials community. Nanocrystalline materials are characterized by a microstructural length or grain size of up to about 100 nm. Materials having grain size of $0.1 to 0.3 mm are classified as submicron materials. Nanocrystalline materials exhibit various shapes or forms, and possess unique chemical, physical or mechanical properties. When the grain size is below a critical value ($10-20 nm), more than 50 vol.% of atoms is associated with grain boundaries or interfacial boundaries. In this respect, dislocation pile-ups cannot form, and the Hall-Petch relationship for conventional coarse-grained materials is no longer valid. Therefore, grain boundaries play a major role in the deformation of nanocrystalline materials. Nanocrystalline materials exhibit creep and super plasticity at lower temperatures than conventional micro-grained counterparts. Similarly, plastic deformation of nanocrystalline coatings is considered to be associated with grain boundary sliding assisted by grain boundary diffusion or rotation. In this review paper, current developments in fabrication, microstructure, physical and mechanical properties of nanocrystalline materials and coatings will be addressed. Particular attention is paid to the properties of transition metal nitride nanocrystalline films formed by ion beam assisted deposition process. #

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“…As a down side, the added TiO 2 also decreases hardness and wear resistance of the coating [2]. During the last decade, nanostructured powders have been gaining increasing attention and improved coating properties, e.g., higher toughness, adhesion, and wear resistance, have been reported [4][5][6][7][8]. Typically, Al 2 O 3 and Al 2 O 3 -TiO 2 powders have been manufactured by blending Al 2 O 3 and TiO 2 fused and crushed powders or by cladding Al 2 O 3 particles with TiO 2 .…”

Section: Introductionmentioning

confidence: 99%

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

et al. 2014

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Thermally-sprayed alumina based materials, e.g., alumina-titania (Al 2 O 3 -TiO 2 ), are commonly applied as wear resistant coatings in industrial applications. Properties of the coatings depend on the spray process, powder morphology, and chemical composition of the powder. In this study, wear resistant coatings from Al 2 O 3 and Al 2 O 3 -13TiO 2 powders were sprayed with plasma and high-velocity oxygen-fuel (HVOF) spray processes. Both, fused and crushed, and agglomerated and sintered Al 2 O 3 -13TiO 2 powders were studied and compared to pure Al 2 O 3 . The coatings were tested for abrasion, erosion, and cavitation resistances in order to study the effect of the coating structure on the wear behavior. Improved coating properties were achieved when agglomerated and sintered nanostructured Al 2 O 3 -13TiO 2 powder was used in plasma spraying. Coatings with the highest wear resistance in all tests were produced by HVOF spraying from fused and crushed powders.

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Fabrication and evaluation of plasma sprayed nanostructured alumina–titania coatings with superior properties

Cited by 233 publications

References 18 publications

From APS to HVOF spraying of conventional and nanostructured titania feedstock powders: a study on the enhancement of the mechanical properties

From APS to HVOF spraying of conventional and nanostructured titania feedstock powders: a study on the enhancement of the mechanical properties

Nanocrystalline materials and coatings

Abrasion, Erosion and Cavitation Erosion Wear Properties of Thermally Sprayed Alumina Based Coatings

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