Air plasma spraying (APS) is a common method of producing hydroxyapatite (HA) coatings for alloprosthetic implants. Modification HA potentially may diminish the risk inflammation and local infection during bone implantation. Titanium implants were coated with different deposition process parameters. powder was deposited using APS axial injection at three distances (100, 120, 140 mm). The surface morphology each implant examined direct contact cytotoxicity coating evaluated according to norm...

Abstract The article describes the influence of a solid lubricant such as graphite on coating-substrate adhesion, susceptibility to cracking during three-point bending tests and tribological properties cermet systems. Two types deposits Cr 3 C 2 -25(Ni20Cr) (Cr -25(Ni20Cr))-5(Ni25C), cold-sprayed Al 7075 alloy substrate, were analyzed. coatings showed homogeneous microstructure with evenly distributed ceramic particles in Ni20Cr matrix. -25(Ni20Cr))-5(Ni25C) also contained placed both...

Abstract Yttrium-stabilized zirconia (YSZ) thermal barrier coatings (TBCs) are indispensable elements of present-day turbine propulsion systems. The ones deposited with atmospheric plasma spraying (APS) characterized by required low conductivity, but they unable to survive frequent thermomechanical loading and therefore their application is limited parts remaining stationary. Expanding capability TBCs sought in various areas, the one realized through modification most proliferated apparatus...

Additive manufacturing (AM) has seen remarkable development in recent years due to relatively high efficiency of the process. Cold spraying (CS) is a particular method AM, which titanium and alloy powders are used. CS very competitive technology enabling deposition coatings, repairing machine parts, new components. For specific applications, surface cold-sprayed materials may require further processing. This paper reports an attempt employ laser treatment (LST) coatings on aluminium...

Abstract Nanostructured and composite WC-12Co coatings were prepared by means of the supersonic spray process (HVOF). The microstructure composition nanostructured powder analyzed scanning electron microscope (SEM) transmission (TEM). Investigations revealed nano grains WC with size in range 50-500 nm. sprayed coating was analysed SEM phase investigated X-ray diffractometer (XRD). A denser structure higher hardness observed compared to conventional a small amount W 2 C, 1−x , some amorphous...

The influence of the size and structure nickel powder grains on corrosion resistance coatings an Al7075 substrate in acidic chloride solution was investigated. Ni coating produced by cold spraying (CS) method. surface microstructure specimens were observed a scanning electron microscope (SEM). test materials carried out using electrochemical It has been found that powders significant effect coatings. porosity alloy increases with increasing powders. rate environment decreases as diameter...

The aim of the study was to characterize nanostructured Al 2 O 3 -13TiO coatings deposited by plasma spraying on a grit blasted steel substrate. were characterized using scanning and transmission electron microscopy X-ray diffraction techniques. Obtained possessed unique microstructure consisting fully melted regions with similar typical sprayed lamellar morphology as conventional areas comprising unmelted or partially nanosized particles. analysis showed that most α-Al phase from powders...

The corrosion resistance of a Cr3C2-25(Ni20Cr) cermet coating applied to an Al7075 substrate (Cr3C2-25(Ni20Cr)/Al7075) was investigated. produced using cold spraying (CS) method. main aim the research determine effect heat treatment on properties coatings substrate. mechanical Cr3C2-25(Ni20Cr)/Al7075 composite were assessed through microhardness (HV) measurements. surface morphology and microstructure specimens examined scanning electron microscope (SEM). Electrochemical testing in acidic...

Purpose The purpose of this paper is to propose cold spraying and laser cladding processes as alternatives cadmium chromium electroplating, respectively. There are many substances or chemicals within the coating technology that can be identified very high concern because their carcinogenic mutagenic nature. Cadmium undoubtedly belong these items basic constituents electrolytic processes. Finding an alternative adapting existing restrictions usage such hazardous products stands for not in...

This work presents the effect of surface roughness (Al 7075) on microstructure and mechanical properties cold-sprayed nickel coatings. Coating analysis included substrate surfaces coating geometry, characterization, microhardness, nanohardness, elastic modulus, adhesion. The results show that preparation had a significant adhesion microstructure. deposited at highest gas temperature revealed dense microstructure, showing very good impacting powder particles to bonding between layers. Ni...

Abstract Cold sprayed Ni coatings offer new possibilities for repairing damaged and mis-machined components. The morphology of the powder particles grain-size distribution have a significant influence on particles' behaviour during compaction properties coating. In this study, two powders with different were cold 7075 Al alloy substrate. first powder, HR, had an irregular spherical shape, whereas second, E, possessed dendritic shape. SEM TEM investigations revealed differences in...

In this work, the effect of substrate, Al 7075 alloy and 1H18NT9 stainless steel, on microstructure tribological properties cold sprayed (Cr3C2-25(Ni20Cr))-(Ni-graphite) coatings was investigated. Both were dense did not reveal any discontinuities at interfaces. They had similar Cr3C2 graphite contents. Their microstructures showed a variety grain sizes matrix phase between inner part splat, showing large ones, their boundaries, where elongated nanostructured grains formed during deposition...

In this research, the cold spray process as an additive manufacturing method was applied to deposit thick titanium coatings onto 7075 aluminium alloy. An analysis of changes in microstructure and mechanical properties depending on standoff distance carried out obtain maximum deposition efficiency. The parameters were selected such a way ensure spraying irregular powder at highest velocity temperature changing from 20 100 mm. Experimental studies demonstrated that had significant effect their...

This article describes the microstructure and mechanical properties of Cr3C2-25(Ni20Cr) cermet coatings cold sprayed on Al 7075 alloy substrates. The aim study was to determine effect three different powder grain sizes standoff distances (phase composition, surface topography, volume fraction distribution Cr3C2 phase in Ni20Cr matrix porosity) (hardness abrasive wear resistance) coatings. examinations revealed that thickness obtained with same duration feed rate decreased increasing size...

The influence of the laser treatment on corrosion resistance Cr3C2-25(Ni20Cr) cermet coating Al7075 (EN, AW-7075) substrate (Cr3C2-25(Ni20Cr)/Al7075) was investigated. produced by cold sprayed (CS) method. tested coatings were irradiated with a spot speed 600 mm/min, 800 and 1000 mm/min. mechanical properties Cr3C2-25(Ni20Cr)/Al7075 characterized microhardness (HV) measurements. surface microstructure specimens observed ascanning electron microscope (SEM) other assistive techniques. test...