Influence of a Filler Composition and Conditions of Flame Spraying on a Structure and Mechanical Properties of Composite Polymer Coatings

1997 ◽  
Author(s):  
Yu. Borisov ◽  
V. Korzhik ◽  
I. Sviridova ◽  
A. Skorokhod
Keyword(s):  
Mechanical Properties ◽  
Thermal Spraying ◽  
Polymer Coatings ◽  
Flame Spraying ◽  
Composite Polymer ◽  
Filled Polymers ◽  
Physico Chemical ◽  
Mechanical And Service Properties ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract In thermal spraying of metal-polymer coatings, the processes of polymers oxidation and destruction can have special features, as the temperature of heating of the filler particles can significantly exceed the temperature of destruction of the polymer binder. Hence, the need to study the features of the process of formation of thermal sprayed coatings from filled polymers and their physico-chemical, mechanical and service properties. This paper describes the influence of a filler composition and conditions of flame spraying on a structure and mechanical properties of composite polymer coatings. It is observed that addition of 5-10 vol. % of Fe-Ni-B alloy powder to low-pressure polyethylene polymer matrices, improves the wear resistance of thermal sprayed coatings 1.2-1.3 times under the conditions of gas-abrasive wear, compared to purely polymer coating, owing to the combination of the higher hardness of the coating with the high damping properties of the polymer matrix.

Comparison between Tribological Characteristics of Al-Cu-Fe-B Quasicrystalline and Mo Coatings

2007 ◽  
Vol 26-28 ◽  
pp. 715-718
Author(s):  
Bong Hwan Kim ◽  
Sang Mok Lee
Keyword(s):  
Mechanical Properties ◽  
Surface Energy ◽  
Bonding Strength ◽  
Tribological Behavior ◽  
Thermal Spraying ◽  
Microstructural Characterization ◽  
Flame Spraying ◽  
Energy Calculation ◽  
Air Plasma ◽  
Oxygen Fuel

Al-Cu-Fe-B quasicrystalline and Mo coatings were obtained on the mild steel and brass substrates by thermal spraying routes for the purpose of replacement of Mo coatings with quasicrystalline ones. Quasicrystalline coatings were prepared by air plasma spraying and/or HVOF (High Velocity Oxygen Fuel) techniques followed by subsequent heat treatment, and Mo coatings, wire flame spraying. For comparative studies of important properties for industrial application, mechanical properties, bonding strength, surface energy, and tribological behavior were investigated based on microstructural characterization. Basic mechanical properties such as hardness, fracture toughness, and elastic modulus of quasicrystalline coating showed comparable values with those of Mo coatings. De-bonding tests of coatings deposited onto brass substrate indicated that the bonding strength of quasicrystalline coatings obtained by HVOF techniques exhibit higher value to Mo coatings. Non-sticking property analogized from surface energy calculation and friction coefficient of quasicrystalline coatings also showed better performance during the tests. It is suggested from this investigation that the quasicrystalline coating can be effectively used as a replacement of the Mo coating, which has shown a recent steep price rise and problems of accidental existence of minor environment harmful elements such as Cr6+, Pb, Cd, and Hg.

Cavitation Resistant Thermal Spray Coatings on Diesel Engine Parts

2000 ◽  
Author(s):  
Y. Borisov ◽  
V. Bogush
Keyword(s):  
Nickel Alloys ◽  
Cavitation Erosion ◽  
Thermal Spraying ◽  
Spray Coatings ◽  
Steel Wires ◽  
Mechanical Mixtures ◽  
Cored Wires ◽  
Sprayed Coatings ◽  
Spraying Method ◽  
Thermal Sprayed Coatings

Abstract This work is devoted to the study of peculiarities of thermal sprayed coatings behavior under conditions of cavitation, as well as the elaboration of compositions of cavitation-resistant coatings and technology for their application with the aim of engine cylinders sleeves protection from cavitation-erosion destruction. The methods of arc metallization, flame and plasma spraying were used for coatings deposition. Powders of metal alloys and oxides, mechanical mixtures of nickel alloys with carbides, wires and flux-cored wires were applied as materials for thermal spraying. Method of magneto-striction vibration was used to determine the coatings cavitation resistance. A correlation between a bond strength of coatings and the character of their cavitation destruction was established. The best results were obtained in the case of using stainless steel wires and flux-cored wires using. Resistance of coated diesel engines sleeves was increased 1.6 times in comparison with sleeves without coatings. Semi-automatic line for arc metallization of diesel sleeves with a production of 600,000 sleeves per year was designed, build up and put into operation.

A comparative study of tribological and mechanical properties of composite polymer coatings on bearing steel

2018 ◽  
Vol 12 (5/6) ◽  
pp. 379 ◽  
Author(s):  
Anand Singh Rathaur ◽  
Jitendra Kumar Katiyar ◽  
Vinay Kumar Patel ◽  
Shubrajit Bhaumik ◽  
Anuj Kumar Sharma
Keyword(s):  
Mechanical Properties ◽  
Comparative Study ◽  
Polymer Coatings ◽  
Bearing Steel ◽  
Composite Polymer

Development of Nanostructured Al2O3-Ni HVOF Coatings

2006 ◽  
Vol 317-318 ◽  
pp. 539-544 ◽  
Author(s):  
Simo Pekka Hannula ◽  
Erja Turunen ◽  
Jari Keskinen ◽  
Tommi Varis ◽  
Teppo Fält ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Spraying ◽  
Al2o3 Coating ◽  
Hvof Spraying ◽  
Protective Properties ◽  
Hvof Coatings ◽  
Hvof Thermal Spraying ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

HVOF thermal spraying has been developed to deposit dense Al2O3-coatings for improved protective properties. As compared to generally used plasma sprayed coatings HVOF coatings can be prepared much denser and thus are better suited for applications where protective properties of the coating are needed. In this paper we describe the development of HVOF spraying technologies for nanocrystalline Al2O3- and Al2O3-Ni-coatings. The microstructure and the mechanical properties of these novel coatings are reported and compared to a conventionally processed Al2O3-coating.

Effects of VC additions on the mechanical properties of bimodal WC–Co HVOF thermal sprayed coatings measured by nanoindentation

2015 ◽  
Vol 48 ◽  
pp. 167-178 ◽  
Author(s):  
C.A. Poblano-Salas ◽  
J.A. Cabral-Miramontes ◽  
A. Gallegos-Melgar ◽  
H. Ruiz-Luna ◽  
J.D. Aguilar-Escobar ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

scholarly journals Pre-/During-/Post-Laser Processes to Enhance the Adhesion and Mechanical Properties of Thermal-Sprayed Coatings with a Reduced Environmental Impact

2011 ◽  
Vol 20 (4) ◽  
pp. 719-735 ◽  
Author(s):  
D. Garcia-Alonso ◽  
N. Serres ◽  
C. Demian ◽  
S. Costil ◽  
C. Langlade ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Environmental Impact ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Evaluation and comparison the effect of heat treatment on mechanical properties of NiCrBSi thermally sprayed coatings

2018 ◽  
Vol 65 (1) ◽  
pp. 34-37
Author(s):  
Mohsen Shabanlo ◽  
Reza Amini Najafabadi ◽  
Amirhossein Meysami
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Wear Test ◽  
Flame Spray ◽  
Micro Hardness ◽  
Post Heat Treatment ◽  
Properties Of Coatings ◽  
Content Type ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Purpose This study aims to investigate the effect of post heat treatment on mechanical properties of NiCrBSi coatings, which were applied on 316L stainless steel using high-velocity oxygen-fuel (HVOF) and flame spray techniques. Design/methodology/approach The properties of coatings were investigated by metallographic characterizations as well as wear, micro-hardness and adhesion tests. Findings The micro-hardness results showed that the coatings considerably increased the sub-layer hardness. In addition, regarding the wear test results, it can be seen that heat treatment increased wear resistance of the coatings. These thermal sprayed coatings are usually re-melted by post heat treatment, leading to improvement in tribological properties. The results obtained revealed that re-melting procedure improved the metallurgical bonding in the substrate\coating interface. Originality/value Microstructure defects resulting from thermal spraying such as pores and unmelted particles can be eliminated by post heat treatment. This process can considerably improve the corrosion and wear resistances of the thermal sprayed coatings.

scholarly journals Towards Reliable Thermal Spray Coatings: An Integrated Approach

2000 ◽  
Author(s):  
Sanjay Sampath
Keyword(s):  
Rapid Heating ◽  
Processing Condition ◽  
Thermal Spraying ◽  
Integrated Approach ◽  
Spray Coatings ◽  
Powder Particles ◽  
Plasma Sprayed ◽  
Individual Droplet ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract Thermal sprayed coatings are used extensively in engineering components for a variety of protective coating applications. Thermal spraying is a highly dynamic process resulting from rapid heating /accelerating of powder particles in a flame, followed by impact and rapid solidification of the droplets (splats). A splat resulting from the flattening of an individual droplet is the basic building block (unit cell) of the thermal sprayed microstructure. Phase and microstructure of the splats (intrinsic) and the integration of the splats (extrinsic) are both affected by processing condition and the properties of a plasma sprayed deposit are directly related to this complex anisotropic microstructure. These affect both performance and reliability of sprayed surfaces.

Molecular and Micro Structure of Thermal Sprayed Heat and Corrosion-Resistant Plastic Coatings

1998 ◽  
Author(s):  
R. Kawase
Keyword(s):  
Thermal Spraying ◽  
High Heat ◽  
Molecular Structures ◽  
Corrosion Performance ◽  
Corrosion Resistant ◽  
Spray System ◽  
Infrared Spectrophotometer ◽  
Ft Ir ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract Polypenylene-sulphide (PPS) and polyphenyletheretherketone (PEEK) have high heat and corrosion-resistant performance. Thermal sprayed coatings of PPS and PEEK have been produced by the HVAF spray system. The molecular structures of these coatings have been analyzed by Fourier Transform Infrared Spectrophotometer (FT-IR) and Differential Scanning Calorimeter (DSC). The microstructures of cross-section and surfaces of these coatings have been observed. The formation mechanism of these coatings has been estimated as follows; (1) PPS and PEEK powders are melted and oxidized during thermal spraying. However, the amount of coating oxidation is very small, so that high anti-corrosion performance of sprayed coatings is obtained. (2) These coatings have some pores including the incomplete melting particles. However, it is estimated that these pores are closed-pores.

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