Incorporation of graphene nano platelets in suspension plasma sprayed alumina coatings for improved tribological properties

Application of Thermal Spray Coatings in Electrolysers for Hydrogen Production: Advances, Challenges, and Opportunities

“…[24] Deposition of coatings utilizing suspensions as well as solution precursors in tandem with conventional spray powders has been demonstrated in separate studies. [178][179][180] Recently, the possibility of extending such a hybrid deposition approach to HVAF process has also been demonstrated. [181][182][183] Thus, it is apparent that the above approach offers immense flexibility and can be conveniently utilized to spray unique material combinations without relying on commercial availability of such chemistries to be commercially available as spray-grade feedstocks.…”

“…Depending upon how the powder and liquid feedstocks are introduced during such ‘hybrid’ spraying, varied coating architectures can be realized such as layered (with sequential feeding), composite (with simultaneous feeding with constant feed rates) or functionally graded (with simultaneous feeding, involving progressively varying relative feed rates), as desired for the targeted application [24] . Deposition of coatings utilizing suspensions as well as solution precursors in tandem with conventional spray powders has been demonstrated in separate studies [178–180] . Recently, the possibility of extending such a hybrid deposition approach to HVAF process has also been demonstrated [181–183] .…”

Development of Yttria-Stabilized Zirconia and Graphene Coatings Obtained by Suspension Plasma Spraying: Thermal Stability and Influence on Mechanical Properties

“…These results strongly suggest that the observed phase consisted of the co-sprayed GNPs. Previous studies have also suggested the presence of GNPs in the pores of thermally sprayed coatings [38]. Thus, it can be assumed that GNPs are responsible for pore formation in composite coatings, with the bonding between successive YSZ spalts prevented by the presence of GNPs [39].…”

Al2O3-TiO2 coatings deposition by intermixed and double injection SPS concepts

“…However, their tribological and fracture toughness properties are not on a par with other ceramic coatings, such as Cr 2 O 3 [9], TiO 2 [5], ZrO 2 [9], YSZ [10], etc. [11]. From a technical perspective, this limits their use in applications where the simultaneous improvement in hardness, elastic modulus, and fracture toughness is required [12].…”

“…Such multi-material coatings can be obtained in different ways, i.e., by: (i) incorporation of agglomerated or sintered powders, where one powder particle has a complex chemical composition [23], (ii) simultaneous deposition of two separate feedstocks [24], (iii) spraying of layered microstructures [25], (iv) building of a gradient structure, where one material passes gradually into another one, and (v) incorporation of fine nano platelets, which are employed as the reinforcement of monolithic coating [11]. Currently, the main approach is the so-called hybrid spraying.…”