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.

Deposition of Fe-based metallic glass coatings by Air Plasma Spraying process

2010 ◽  
Vol 4 (3) ◽  
pp. 288 ◽  
Author(s):  
Fuping Li ◽  
Jinshan Li ◽  
Hongchao Kou ◽  
Chaoping Jiang ◽  
Xiangyi Xue ◽  
...  
Keyword(s):  
Metallic Glass ◽  
Plasma Spraying ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Plasma Spraying Process ◽  
Spraying Process

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.

Influence of plasma spraying process parameters on properties of the deposited Ni-Al coatings

2001 ◽  
Author(s):  
Sigitas Tamulevicius ◽  
Rytis Dargis ◽  
Pranas Valatkevicius ◽  
Kestutis Slapikas
Keyword(s):  
Plasma Spraying ◽  
Process Parameters ◽  
Plasma Spraying Process ◽  
Spraying Process

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.

The Influence of Technological Parameters of the Plasma Spraying Process on the Macrostructure of Titanium Coatings

2020 ◽  
pp. 44-53
Author(s):  
S.V. Babin ◽  
E.N. Egorov ◽  
A.A. Fursov
Keyword(s):  
Plasma Spraying ◽  
Adhesive Bonding ◽  
Surface Characteristics ◽  
Porous Coating ◽  
Technological Parameters ◽  
Porous Surfaces ◽  
Titanium Surfaces ◽  
Supporting Plate ◽  
Plasma Spraying Process ◽  
Spraying Process

Capillary-porous surfaces are used in endoprosthetics as well as in catalytic converters and heat exchangers to increase the strength of adhesive bonding. Plasma spraying is one of the methods to obtain rough coatings for capillary-porous surfaces. Determining the relationships between the parameters of macrostructure of capillary-porous surfaces and the technological factors of the plasma spraying process enables one to control the surface characteristics. It is an important and fundamental element in the formation of the required properties of the surface. However, studies on the influence of technological parameters of plasma spraying on the construction and macrostructure of plasma-sprayed titanium surfaces are insufficient in scientific literature. This paper presents a study on the influence of roughness, curvature and the material of the supporting plate surface, as well as distance and angle of spraying on the structure of a VT1-0 titanium capillary porous coating applied to a VT6 titanium alloy supporting plate. A regression analysis of the experiment results is performed. It is shown that all the parameters have a significant influence on the surface structure. The experimentally obtained relationships make it possible to produce surfaces with required macrostructure parameters. They help to evaluate the possibility of obtaining titanium surfaces of this kind and thoroughly select parameters of the plasma spraying process in order to obtain surfaces with the required properties.

In-Flight Behaviors and Properties of Plasma-Sprayed Tungsten Coatings

2010 ◽  
Vol 658 ◽  
pp. 13-16 ◽  
Author(s):  
Ya Ran Niu ◽  
De Yang Hu ◽  
Heng Ji ◽  
Xue Bin Zheng
Keyword(s):  
Thermal Conductivity ◽  
Bonding Strength ◽  
Copper Alloy ◽  
Room Temperature ◽  
Air Plasma ◽  
Air Plasma Spraying ◽  
Plasma Facing Materials ◽  
Plasma Sprayed ◽  
Sprayed Coatings ◽  
Spraying Process

Tungsten is one of the most promising candidates for the plasma facing materials (PFM) in fusion experiment devices. In this study, tungsten coatings were fabricated on copper alloy substrates via air plasma spraying technology. The in-flight behaviors of tungsten particles in the spraying process were investigated. The microstructure and some properties of the as-sprayed coatings, including surface roughness, bonding strength, microhardness and thermal property, were evaluated. The results showed that the temperature and velocity of the in-flight tungsten particles increased by enhancing the spraying power. Un-melted particles and microcracks were found for the coatings prepared under the low (32.7kW) and high (47.6kW) spraying powers, respectively. The highest bonding strength and microhardness were obtained for the coating prepared under a medium spraying power (42.5kW) by reason of its good in-flight behaviors. The thermal conductivity of tungsten coatings was 32.2 W٠K-1٠m-1 at room temperature, which was much lower than that of bulk tungsten.

Sign in / Sign up

Export Citation Format

Share Document