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.

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.

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.

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.

Principles and Applications of Thermal Spray Coatings

2021 ◽  
pp. 31-70
Author(s):  
John Henao ◽  
Carlos A. Poblano-Salas ◽  
Fabio Vargas ◽  
Astrid L. Giraldo-Betancur ◽  
Jorge Corona-Castuera ◽  
...  
Keyword(s):  
Thermal Spray ◽  
Thermal Spraying ◽  
Industrial Applications ◽  
Thermal Spray Coatings ◽  
Flame Spray ◽  
Spray Coatings ◽  
Thermal Barriers ◽  
Energy Conversion Devices ◽  
Thermally Sprayed ◽  
Sprayed Coatings

The goal of the chapter is to address the fundamental theory of thermal spraying and its modern industrial applications, in particular, those involving flame spray, HVOF, plasma spray, and cold spray processes. During the last 30 years, thousands of manuscripts and various book chapters have been published in the field of thermal spray, displaying the evolution of thermally sprayed coatings in many industrial applications. Thermal spray coatings are currently interesting for different modern applications including prosthesis, thermal barriers, electrochemical catalysis, electrochemical energy conversion devices, biofouling, and self-repairing surfaces. The chapter will explain the fundamental principles of the aforementioned thermal spraying processes and discuss the effect of different controlling parameters on the final properties of the produced coatings. This chapter will also explore current and future industrial applications of thermal spray coatings.

Slurry Erosion Behavior of Thermal Spray Coatings

2015 ◽  
pp. 268-293
Author(s):  
Harpreet Singh Grewal ◽  
Harpreet Singh
Keyword(s):  
Surface Modification ◽  
Thermal Spray ◽  
Thermal Spray Coatings ◽  
Slurry Erosion ◽  
Erosion Behavior ◽  
Spray Coatings ◽  
Hydro Power Plants ◽  
Surface Modification Techniques ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Slurry erosion is a degrading phenomenon usually observed in machineries dealing with particle-laden fluid such as hydro power plants, ship propellers, pump impellers, valves, and connecting pipes. The low erosion resistance of commonly employed structural materials prompts the use of different surface modification techniques. Among several types of surface modification techniques, thermal spraying has achieved a significant recognition worldwide due to its versatile nature. In this chapter, slurry erosion behavior of thermal sprayed coatings has been discussed with special emphasis on the contribution of different coating related parameter. It has been observed that microstructure play an important role in determining the slurry erosion performance of thermal spray coatings. Different microstructural features such as splat boundaries, pores, un-melted particles, and cracks are detrimental for the thermal spray coatings exposed to erosive environment. A parameter useful for identification of primary erosion mechanism for thermal sprayed coatings is also discussed.

Photothermal Radiometry of Thermal Spray Coatings: Thermophysical Properties and Disbonding Effects Characterization

2000 ◽  
Author(s):  
A. Mandelis ◽  
J.A. Garcia ◽  
B. Farahbarhsh
Keyword(s):  
Thermophysical Properties ◽  
Photothermal Radiometry ◽  
Experimental Results ◽  
In Situ Monitoring ◽  
Spray Coatings ◽  
Interfacial Defects ◽  
Steel Substrates ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract Laser infrared photothermal radiometry (PTR) can be used to determine the thermophysical properties (thermal diffusivity and conductivity) and interfacial defects (i.e. disbonding) of various thermal sprayed coatings on carbon steel substrates. PTR experimental results are compared with a one-dimensional photothermal model that can take into account roughness affects and interfacial defects by considering a roughness equivalent-layer and an equivalent-thermal resistance, respectively. The foregoing thermophysical parameters of the thermal sprayed coatings are obtained when a multi-parameter optimization algorithm is used to fit the PTR experimental results. The potential of the PTR technique for in-situ monitoring of the coating process and the characterization of the thermal sprayed coatings will be discussed in this paper.

Production of Heat and Corrosion-Resistant Plastic Coatings

1996 ◽  
Author(s):  
R. Kawase ◽  
A. Nakano
Keyword(s):  
Corrosion Test ◽  
Thermal Spraying ◽  
High Porosity ◽  
Corrosion Resistant ◽  
Good Corrosion Resistance ◽  
Spray System ◽  
Ft Ir ◽  
Ir Analysis ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract Thermal sprayed coatings of polypenylene-sulphide (PPS) and polyphenyletherether-ketone (PEEK) have been produced by HVAF spray system. The properties of these coatings have been investigated by corrosion test and FT-IR analysis. The main results of this study are summarized as follows; (1) In case of PPS coatings, PPS powder is oxidized during thermal spraying. However, PPS coatings have a good corrosion resistance. However, PEEK coatings have high porosity so that corrosion of the substrate occurs. (2) In case of PEEK coatings, the molecular structure of PEEK powder is not changed during thermal spraying.

Thermal Spraying of Wear and Corrosion Resistant Surfaces

2008 ◽  
Vol 384 ◽  
pp. 75-98 ◽  
Author(s):  
Bernhard Wielage ◽  
Thomas Lampke ◽  
Thomas Grund
Keyword(s):  
Thermal Spray ◽  
Thermal Spraying ◽  
Base Material ◽  
Thermal Spray Coatings ◽  
Selective Coating ◽  
Spray Coatings ◽  
Wear And Corrosion ◽  
Parameter Field ◽  
Thermal Spray Processes ◽  
Sprayed Coatings

Thermal spraying is one of the most variable and diverse surface coating techniques concerning materials to be processed as well as possible geometries to be coated. The group of thermal spray processes covers a large parameter field to combine nearly each coating with each base material. Thermally sprayed coatings can be applied very evenly and therefore allow to be applied on final-shaped components. Otherwise, if further treatment or finishing is necessary, thermal spray coatings can be processed by grinding or even milling. Masking during the coating process permits the selective coating of specific surface parts or the application of required geometrically structures, e. q. conductor structures. The main application field of thermal spray coatings is the (combined) wear and corrosion protection of selected component parts.

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