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.

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.

Thermal Spraying of High Performance Thermoplastics

1998 ◽  
Author(s):  
E. Lugscheider ◽  
C. Herbst ◽  
A. Fischer
Keyword(s):  
High Performance ◽  
Elevated Temperatures ◽  
Thermal Spraying ◽  
Paper Coatings ◽  
Thermally Sprayed Coatings ◽  
Ft Ir ◽  
Ir Analysis ◽  
Thermally Sprayed ◽  
Sprayed Coatings ◽  
Wipe Tests

Abstract Thermally sprayed coatings of high performance thermoplastics are of interest espacially for the chemical industry for anti-corrosion applications at elevated temperatures. In this paper coatings of polyetherether-keton (PEEK) and polyphenylen-sulphide (PPS) have been produced by simple flamespraying. They have been investigated by optical metallography, FT-IR analysis and DSC-analysis. Among the coating properties also the "in-flight" particles have been studied by wipe-tests and FT-IR analysis in order to assess possible decomposition effects during spraying.

Surface Modification of Thermal Sprayed Coatings

1996 ◽  
Author(s):  
G. John ◽  
T. Troczynski
Keyword(s):  
Thermal Protection ◽  
Sol Gel ◽  
Limiting Factor ◽  
Processing Temperature ◽  
High Porosity ◽  
Corrosive Media ◽  
Major Purpose ◽  
Interconnected Porosity ◽  
Sprayed Coatings ◽  
Thermal Sprayed Coatings

Abstract Thermal sprayed coatings are frequently used in corrosive environments, even when their major purpose is to provide wear or thermal resistance, rather than corrosion resistance. This includes Thermal Barrier Coatings (TBC), where high porosity is a desired feature to give good thermal protection. However, as this proves to be a limiting factor in the corrosion protection, a trade off is involved. This is because the interconnected porosity in TBCs allows the corrosive media to reach the coating-substrate interface, which eventually leads to delamination of the coatings. This work addresses the problem of permeability of TBCs which can lead to premature delamination due to interfacial corrosion. The coatings studied were yttria-stabilized zirconia TBCs. A simple infiltration technique has been proposed using sol-gel ceramic precursors. The precursors studied include aluminum isopropoxide or pre-hydrolyzed ethyl silicate, which decomposed to alumina and silica respectively, at surface heat treatment temperatures as low as 550°C. In addition to sealing the surface, it is believed that some level of compressive stress is generated on the surface of TBCs on cooling from the processing temperature. Electrochemical tests in 3.0% NaCl have been carried out to study the effectiveness of the sealant. These potentiodynamic tests as well as permeability tests show a considerable decrease in interconnected porosity with sol-gel modifications of the coatings.

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.

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.

Tribological Requirements of Thermally Sprayed Coatings for Wear Resistant Applications

2000 ◽  
Author(s):  
S.D. Siegmann ◽  
O.C. Brandt ◽  
N.M. Margadant
Keyword(s):  
State Of The Art ◽  
Tribological Behavior ◽  
Thermal Spraying ◽  
Field Tests ◽  
Spray System ◽  
Wide Range ◽  
Thermally Sprayed Coatings ◽  
Chromium Replacement ◽  
Thermally Sprayed ◽  
Sprayed Coatings

Abstract During the last decades, improved understanding of tribological behavior of different material combinations led also to an intensified development of thermal spray applications. In the field of e.g. hard chromium replacement by thermal spraying, significant amount of work has been done and published world wide, however, the authors manly focused on only one tribological aspect like friction, abrasion, erosion, cavitation or corrosion, respectively. In real applications, often more than one of those factors influence the successful use of these coatings. Besides the bulk properties of the materials, the coating micro structure, which is strongly spray system dependent, needs to be considered and investigated. Higher functionality and reliability than conventional competitive coatings still has to be proved at laboratory scale and under field conditions for thermally sprayed coatings. This paper describes the state of the art of thermally sprayed coatings as alternatives for other coatings. Published literature data and a wide range of own tribological investigations and field tests, reveals the potential for other applications.

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.

Preparation of Corrosion-Resistant Ti/RuO2 Composite Powders

2013 ◽  
Vol 743-744 ◽  
pp. 584-588
Author(s):  
Pan Qiao Duan ◽  
Guo Tong Qin ◽  
Wei Wei
Keyword(s):  
Corrosion Resistance ◽  
Sulfuric Acid ◽  
Corrosion Test ◽  
Mass Fraction ◽  
Annealing Temperature ◽  
Ruthenium Oxide ◽  
Molar Ratio ◽  
Composite Powders ◽  
Corrosion Resistant ◽  
Good Corrosion Resistance

Ruthenium oxide coated titanium composite powders were prepared by precipitation of ruthenium salt to improve the resistance of titanium to corrosion. The composite powders were characterized by TEM and XPS. The results show that the ruthenium oxide is evenly deposited on the Ti powders. Corrosion test for the composite powders and Ti powders was conducted in 65% sulfuric acid (mass fraction). The composite powders exhibit good corrosion resistance. The corrosion rate decreased from 98.5% to 0.48% through modification. Ru/Ti molar ratio and annealing temperature have a major impact on the corrosion resistance.

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