INFLUENCE OF CARBON NANOTUBES REINFORCEMENT ON CHARACTERISTICS OF THERMALLY SPRAYED CERAMIC COATINGS

2020 ◽  
pp. 2050052
Author(s):  
G. MOHAMMED THALIB BASHA ◽  
B. VENKATESHWARLU
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Ceramic Coatings ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Hvof Spraying ◽  
Titania Coatings ◽  
Thermally Sprayed ◽  
Spraying Process ◽  
Reduced Surface

The influence of reinforcement of carbon nanotubes (CNTs) on microstructural features and mechanical properties of thermally sprayed Al2O3–3[Formula: see text]wt.%TiO2 and WC–20[Formula: see text]wt.%Co coatings was investigated. Alumina–Titania coatings were deposited by Air Plasma Spraying (APS) and Tungsten Carbide–Cobalt coatings were deposited by High-Velocity Oxy-Fuel (HVOF) spraying process. The coatings obtained with reinforcement of CNTs were characterized to interpret the microstructural changes and also to evaluate the variation in their mechanical properties. The percentage composition of CNTs in both APS and HVOF coatings systems were varied in the order of 2, 4, and 6[Formula: see text]wt.%. It has been found that homogenous dispersion of carbon nanotubes in the coating systems results in increased microhardness and reduced surface roughness. Also, the microstructural features of the coating systems clearly showed that the coatings are denser with fewer pores due to the presence of CNTs.

High Quality Ceramic Coatings Sprayed by High Efficiency Hypersonic Plasma Spraying Gun

2005 ◽  
Vol 475-479 ◽  
pp. 3981-3984 ◽  
Author(s):  
Sheng Zhu ◽  
Bin Shi Xu ◽  
Jiu Kun Yao
Keyword(s):  
Plasma Spraying ◽  
Ceramic Coating ◽  
High Efficiency ◽  
Low Cost ◽  
Ceramic Coatings ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Ceramic Powders ◽  
Tio2 Ceramic ◽  
Spraying Process

This paper introduced the structure of the high efficiency hypersonic plasma spraying gun and the effects of hypersonic plasma jet on the sprayed particles. The optimised spraying process parameters for several ceramic powders such as Al2O3, Cr2O3, ZrO2, Cr3C2 and Co-WC were listed. The properties and microstructure of the sprayed ceramic coatings were investigated. Nano Al2O3-TiO2 ceramic coating sprayed by using the high efficiency hypersonic plasma spraying was also studied. Compared with the conventional air plasma spraying, high efficiency hypersonic plasma spraying improves greatly the ceramic coatings quality but at low cost.

Microstructure, Mechanical and Shielding Properties of Fe67.5Ni23.5B9 Coating / 321 Stainless Steel Laminated Composite by the Air-Plasma Spraying Procedure

2011 ◽  
Vol 295-297 ◽  
pp. 1361-1368
Author(s):  
Wen Feng Yang
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Plasma Spraying ◽  
Laminated Composite ◽  
Radiation Shielding ◽  
X Rays ◽  
Shielding Effectiveness ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Γ Rays

To meet the requirements of integrative mechanical properties and shielding effectiveness of nuclear radiations shielding materials, the boron-rich shielding coating (Fe67.5Ni23.5B9, in wt. %) were produced onto 321 stainless steel substrate (SS) by the air-plasma spraying technology. This type of coating-SS laminated composite will be likely to be used as protection against neutrons and γ rays from radiation shielding systems. The microstructure was characterized by scanning electron microscope (SEM), energy-dispersive spectrometry (EDS) and X-rays diffraction (XRD). The mechanical properties of Fe67.5Ni23.5B9 coatings were investigated, including adhesion strength, tensile properties and residual stress. The shielding effectiveness of the coating-SS laminated composite, including the slowing down of fast-speed neutrons, absorption for 0.4ev below thermal neutrons and the attenuation against 60Co and 137Cs γ rays were investigated. The results show that the produced Fe67.5Ni23.5B9 coatings-SS laminated composite possess homogeneous microstructure, satisfactory integrative mechanical properties and shielding effectiveness which testify the possible application in radiation shielding systems.

Tribological Behavior and Surface Chemistry Characteristics of Quasicrystal Coatings

2007 ◽  
Vol 124-126 ◽  
pp. 1541-1544 ◽  
Author(s):  
Bong-Hwan Kim ◽  
Sang Mok Lee ◽  
Je Sik Shin ◽  
B.M. Moon
Keyword(s):  
Process Parameters ◽  
Tribological Behavior ◽  
Surface Characteristics ◽  
Air Plasma ◽  
Micro Hardness ◽  
Air Plasma Spraying ◽  
Porosity Level ◽  
Surface Method ◽  
Plasma Spraying Process ◽  
Spraying Process

The aim of this study was to investigate the effects of air plasma spraying process parameters on the tribological behavior and surface characteristics of quasicrystal coatings. For this purpose, the response surface method (RSM), one of the designs of experiment (DOE) was utilized to systematically investigate the combined effects of each process parameters. The RSM analysis revealed that the superior tribological performance of quasicrystal coatings was obtained by the optimized condition of specific micro-hardness and porosity level. It was specially quoted that the relatively low hardness of quasicrystal coatings caused the improvement of abrasive wear resistance during the current investigation.

Supersonic air-plasma spraying of carbide ceramic coatings

2020 ◽  
Author(s):  
Viktor Kuzmin ◽  
Igor Gulyaev ◽  
Dmitriy Sergachev ◽  
Sergey Vashchenko ◽  
Anatoliy Lysakov ◽  
...  
Keyword(s):  
Plasma Spraying ◽  
Ceramic Coatings ◽  
Air Plasma ◽  
Air Plasma Spraying

scholarly journals Tribological Characteristics of Carbon Nanotubes-Reinforced Plasma-Sprayed Al2O3-TiO2 Ceramic Coatings

2021 ◽  
Vol 2021 ◽  
pp. 1-12
Author(s):  
Chaitanya Kalangi ◽  
Venkateshwarlu Bolleddu ◽  
Haiter Lenin Allasi
Keyword(s):  
Carbon Nanotubes ◽  
Oil And Gas ◽  
Steel Substrate ◽  
Ceramic Coatings ◽  
Porous Coating ◽  
Air Plasma ◽  
Wear Performance ◽  
Wide Range ◽  
Plasma Sprayed ◽  
The Impact

Thermal-sprayed coatings are widely used in various oil and gas industries for wear and corrosion applications. However, increasing performance and requirements make conventional coatings inadequate for future needs. Furthermore, the heat conductivity of bulk materials cannot be minimized easily. Therefore, the use of low porous coating with nanocomposite doping is an effective way to produce coatings with reduced thermal conductivity. Plasma-sprayed Al2O3-TiO2 coatings are found in a wide range of applications recently in many industries because of their exceptional properties including low expenses and ease of availability. In this work, the wear-resistant and low porous coatings of Al2O3 + 3 wt%TiO2 and respective carbon nanotube (CNT) doped coatings are prepared and characterized. The coatings are deposited on the AISI 1020 steel substrate using air plasma spraying. The impact of CNTs reinforcement on the percentage of pores and wear performance of coatings is investigated. Also, wear tracks morphology is investigated to determine the wear mechanism that is responsible for the wear of coatings. From the analysis, it is observed that the formation of cracks as well as micropores is decreased by the addition of carbon nanotubes. Moreover, uniform CNT distribution and good adhesion of coatings with the substrate are the major factors that improve the wear performance of the coated surface.

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