Microstructural characterization and electrochemical corrosion behaviour of HVOF sprayed Alloy718-nanoAl<sub>2</sub>O<sub>3</sub> composite coatings

Vasudev

2022

In the present work, the radio frequency (RF) magnetron sputtering process was used to develop boron nitride thin films on 316L stainless steel. The target material used in the experiment was a hexagonal boron nitride (c-BN) target. The deposition was performed in three different Ar and N2 system mixing regimes. The composition and morphology of the coating developed at various N2 and Ar plasma ratios were investigated using scanning electron microscopy (SEM) and X-ray diffraction (XRD) techniques. The electrochemical corrosion test was used to investigate the boron nitride coating's corrosion behaviour. The goal was to study the changes in the ratio of N2 and Ar during the process and to understand the structure of cubic boron nitride (c-BN) coatings. Increased microstructure uniformity and further c-BN step creation with different quantities (Q) QAr/QN2 = 2 imply a fundamental strategy for creating improved cubic boron nitride films.

Section: Corrosion Rate Of the Base Metal And Thin Filmsmentioning

confidence: 99%

Surface protection of SS-316L with boron nitride based thin films using radio frequency magnetron sputtering technique

Vasudev

2022

“…These polymer coatings provide powerful functions to the materials they are applied to, whether they are straightforward coatings or nanoparticle-incorporated, functionalized composite coatings. It has potential applications in a wide range of materials, including metals, ceramics, polymers, and nanoparticles, among others [3][4][5][6][7][8][9][10]. In the realm of biomedicine, polymeric coatings play an important part in the development of the future generation of biomaterials and equipment.…”

Section: Introductionmentioning

confidence: 99%

Applications of biopolymer coatings in biomedical engineering

Gill

2022

In this paper, a comprehensive overview of recent developments in the many different types of biopolymer coatings used in biomedical applications is presented. Biopolymer coatings have tremendous promise in various biological applications due to their adaptability. Polymer coatings may be used to improve surface qualities to fulfill certain criteria or to include extra capabilities for various biomedical applications. This analysis focuses mostly on certain polymers for usage in coating applications as well as a variety of polymer coatings that provide enhanced functionalization. The most recent findings from relevant research have been presented on using polymer coatings on nanoparticles for biological applications. Moreover, the latest research on biopolymer coatings for improved tissue engineering and drug delivery on various substrates and nanoparticles has been reported. Additionally, the most recent scientific breakthroughs have been compiled.

“…Chromium carbide coatings enhance the erosion resistance of hydro turbine components [16]. Cermets coatings can be deposited by HVOF, which is a promising technique due to its characteristics [17,18]. The selection of the coating mainly depends on the application; however, the scope of thermal spray coatings has increased vastly in recent years [19,20].…”

Section: Introductionmentioning

confidence: 99%

Mechanical and microMechanical and microstructural characterization of yttria-stabilized zirconia (Y2O3/ZrO2; YSZ) nanopartstructural characterization of yttria stabilized zirconia (Y2O3/ZrO2; YSZ) nanoparticles reinforced WC-10Co-4Cr coated turbine steel

Kumar

Bhandari²,

Goyal

2022

The aim of this paper is to investigate the WC-10Co-4Cr coatings reinforced with 5 % and 10 % of yttria-stabilized zirconia (Y2O3/ZrO2; YSZ) nanoparticles deposited on the CA6NM turbine steel by using the high-velocity oxy-fuel (HVOF) thermal spraying technique. In the HVOF technique, the hot jet of the semi-solid particles strikes against the workpiece and creates a layer of coating of varying thickness on the substrate material. The coatings fabricated with HVOF were analyzed by scanning electron microscope (SEM) / energy-dispersive x-ray spectroscopy (EDS). The phase identification of a crystalline material was made with the x-ray diffraction (XRD) technique. The mechanical properties in terms of porosity, surface roughness and microhardness of the nanocomposite coatings were also evaluated. The SEM/EDS analysis showed that dense and homogeneous coatings were developed by the reinforcement of YSZ nanoparticles. The peaks of XRD graphs of WC-10Co-4Cr coating reinforced with 5 and 10 % of YSZ nanoparticles revealed that the WC was present as a major phase and W2C, Co3W3C, Co, Co6W6C, Co6W and Y2O3/ZrO2 nanoparticles were observed as a minor phase. The porosity level decreased up to 42 and 56 % by the addition 5 and 10 % of YSZ nanoparticles as compared with conventional WC-10Co-4Cr coating. The surface roughness values for WC-10Co-4Cr conventional coating, 95 % (WC-10Co-4Cr) + 5 % YSZ and 90 % (WC-10Co-4Cr) + 10 % YSZ nanocomposite coated samples were found to be 5.03, 4.89 and 4.28 respectively. The nanocomposite coatings reinforced with 10 % YSZ nanoparticles exhibited the highest microhardness value (1278 HV). The WC-10Co-4Cr coatings reinforced with 10 % of YSZ nanoparticles resulted in low porosity, low surface roughness and high microhardness. During the coating process, the nanoparticles of YSZ flow into the pores and are dispersed in the gaps between the micrometric WC particles and provide a better shield to the substrate material. The WC-10Co-4Cr with 10 % of YSZ nanoparticles showed better results in terms of mechanical and microstructural properties during the investigation.