The Effect of the Ceramic Dispersion on the Nickel Matrix Composite Coating Properties after Plastic Working

2009 ◽  
Vol 147-149 ◽  
pp. 813-818 ◽  
Author(s):  
Tomasz Cyryl Dyl ◽  
Robert Skoblik ◽  
Robert Starosta
Keyword(s):  
Composite Coatings ◽  
Hydraulic Press ◽  
Flame Spraying ◽  
Al Alloy ◽  
Plastic Working ◽  
Dispersion Phase ◽  
Metallic Material ◽  
Al2o3 Composite ◽  
Nickel Base ◽  
Hot And Cold Rolling

The paper presents the effect of dispersion phase of Al2O3 on selected potential properties of composite coatings on the nickel base. Coatings of Ni-Al-Al2O3 were applied on the steel specimens using the subsonic process of flame spraying. The specimens were then subjected to both cold and hot plastic working by rolling and also cold pressing by the hydraulic press. Plastic working is an alternative to machining, as the method of finishing of coats applied by flame spraying. The paper presents the findings of the research into the possibility of using plastic working (hot and cold rolling and pressing) to obtain the selected properties of the flame sprayed Ni-Al alloy coatings and Ni-Al-Al2O3 composite coatings. The alloy coatings had a single-phase structure, namely boundary solution α , of the maximum 10% aluminium solubility in the crystal lattice of nickel, whereas in the composite coatings the volume content of non-metallic material Al2O3 was: 0, 15, and 30 %.

Effect of the Ceramic Dispersion in the Nickel Matrix Composite Coatings on Corrosion Properties after Plastic Working

2011 ◽  
Vol 183 ◽  
pp. 43-48 ◽  
Author(s):  
Tomasz Cyryl Dyl ◽  
Robert Starosta
Keyword(s):  
Surface Roughness ◽  
Composite Coatings ◽  
Alloy Coating ◽  
Corrosion Current ◽  
Hydraulic Press ◽  
Flame Spraying ◽  
Al Alloy ◽  
Plastic Working ◽  
Corrosion Properties ◽  
Dispersion Phase

Coatings of metal and ceramic composite were applied on the steel specimens using the subsonic process of flame spraying. The specimens were then subjected to both cold and hot plastic working by rolling and also cold pressing by the hydraulic press. Plastic working is an alternative to machining, as the method of finishing of coats applied by flame spraying. The article presents the findings of the research into the possibility of using plastic working (hot and cold rolling and pressing) to obtain the corrosion properties of the flame sprayed Ni-Al alloy coatings and Ni-Al-Al2O3composite coatings. The alloy coatings had a single-phase structure, of the maximum 10% aluminium solubility in the crystal lattice of nickel, whereas in the composite coatings the volume content of non-metallic material Al2O3was 15% and 30 %. After finishing the adhesion reduction, cracks on the surface and cross-sections of coatings was not observed. The largest value of strain hardening of alloy coating Ni-5%Al was stated after pressing. The composite coatings obtain by flame spraying be characterized by big surface roughness (Ra= 13.3 µm). The plastic working caused decrease surface roughness. Minimum value of Raparameter was observed after hot rolling. It was found that maximal roughness was presented after pressing. The corrosion tests were performed in 0.01 M H2SO4solution by potentiokinetic technique. The article presents the effect of dispersion phase of Al2O3on corrosion properties of composite coatings on the nickel base. The corrosion rate was dependent on method of plastic working. The increasing drafts resulted in rise corrosion current density and decrease in value of corrosion potential.

scholarly journals The Experimental and Numerical Research for Plastic Working of Nickel Matrix Composite Coatings

Materials ◽  
2020 ◽  
Vol 13 (14) ◽  
pp. 3177
Author(s):  
Tomasz Dyl ◽  
Robert Starosta ◽  
Dariusz Rydz ◽  
Bartosz Koczurkiewicz ◽  
Wioletta Kuśmierska-Matyszczak
Keyword(s):  
Surface Layer ◽  
Composite Coatings ◽  
Thermal Spraying ◽  
Experimental Tests ◽  
Alloy Coating ◽  
Strength Properties ◽  
Flame Spraying ◽  
Plastic Working ◽  
Plastic Processing

In the machine, metallurgical, and shipbuilding industries, steel products with alloy and composite coatings based on nickel may be used. It is expedient to improve the physicochemical properties of the surface layer of products as they have a significant roughness value after thermal spraying. It is therefore important to finish the layers applied by flame spraying, where machining is used for this purpose. However, it causes a loss of coating material, which is quite expensive. Therefore, in order to reduce costs and improve the quality of the surface layer, the finishing treatment of nickel-based coatings by means of plastic working is used. Two types of plastic working were proposed: rolling and burnishing. Numerical and experimental tests of the plastic processing of alloy coatings were carried out. The roughness of the coatings after rolling decreased to 1/25 and 30% strengthening of the alloy coating matrix was determined. After burnishing, roughness was reduced to 1/12 and the alloy coatings were strengthened by 25%. Plastic working by rolling and burnishing has a beneficial effect on the surface quality of the workpiece, not only by significantly improving the roughness, but also by increasing the strength properties of the surface layers.

Corrosion of Ni-Al and Ni-Al-Al2O3 Flame Sprayed Coatings of „CastoDyn 8000" System in 0.01 M H2SO4 and 3.5% NaCl Solutions

2011 ◽  
Vol 183 ◽  
pp. 185-192 ◽  
Author(s):  
Robert Starosta
Keyword(s):  
Current Density ◽  
Corrosion Current Density ◽  
Sea Water ◽  
Composite Coatings ◽  
Corrosion Current ◽  
Artificial Seawater ◽  
Flame Spraying ◽  
Al Alloy ◽  
Acidic Environment ◽  
Corrosion Properties

In the paper researches results of corrosion properties of Ni-Al alloy and Ni-Al-Al2O3 composite coatings were presented. Coatings were obtained by flame spraying of "Casto-Dyn 8000" torch. During coatings flame spraying of torch was used a small distance from the substrate. Instead of commonly used spray distance 150 mm, 100 mm was used. The studies in 0.01 M H2SO4 and 3.5% NaCl (artificial seawater) environments were realized. Evaluated coatings are more corrosion resistant in the 3.5% NaCl environment than in the 0.01 M H2SO4. Corrosion current density for alloy coatings in artificial seawater was 20 μA/cm2 and 223 μA/cm2 in an acidic environment. The value of corrosion potential in an environment of 3.5% NaCl is about 200 mV lower than in 0.01 M H2SO4. Composite coatings Ni-Al-Al2O3 were characterized by a lower corrosion current densities and increased resistance than Ni-Al coatings in acidic environment. The presence of alumina in the coating matrix caused increased corrosion current density in sea water environment.

TiC-TiSi2-Al2O3 composite coatings prepared by spray drying, heat treatment and plasma spraying

2021 ◽  
Vol 857 ◽  
pp. 158221
Author(s):  
Yu-duo Ma ◽  
Wei Li ◽  
Ming-yan Guo ◽  
Yong Yang ◽  
Yu-hang Cui ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Spray Drying ◽  
Plasma Spraying ◽  
Composite Coatings ◽  
Al2o3 Composite

MoS2 additive to the MAO Al2O3 composite coatings with enhanced mechanical performances

2018 ◽  
Vol 6 (1) ◽  
pp. 016543 ◽  
Author(s):  
Xin Wu ◽  
Hongxia Li ◽  
Junpeng Lu ◽  
Yangyang Li ◽  
Chengbiao Yang ◽  
...  
Keyword(s):  
Composite Coatings ◽  
Al2o3 Composite ◽  
Mechanical Performances

scholarly journals Effect of Gas Pressure and Temperature on Stereometric Properties of Al+Al2O3 Composite Coatings Deposited by LPCS Method

2014 ◽  
Vol 59 (3) ◽  
pp. 879-886 ◽  
Author(s):  
M. Winnicki ◽  
T. Piwowarczyk ◽  
A. Małachowska ◽  
A. Ambroziak
Keyword(s):  
Laval Nozzle ◽  
Composite Coatings ◽  
Gas Pressure ◽  
Feedstock Powder ◽  
Substrate Distance ◽  
Al2o3 Composite ◽  
Spray Method ◽  
Powder Mass ◽  
De Laval Nozzle ◽  
Temperature And Pressure

Abstract The paper deals with effect of working gas pressure and temperature on surface stereometry of coatings deposited by low-pressure cold spray method. Examinations were focused on aluminium coatings which are commonly used to protect substrate against corrosion. A commercial Al spherical feedstock powder with admixture of Al2O3 (Al + 60vol.-% Al2O3), granulation -50+10 µm, was used to coat steel, grade S235JR. Thedeposited coatings were studied to determine their stereometry, i.e. roughness, transverse and longitudinal waviness, topography of surface and thickness as the functions of gas pressure and temperature. A profilometer and focal microscope were used to evaluate the stereometric properties. In order to reduce the number of variables, the remaining process parameters, i.e. shape and size of de Laval nozzle, nozzle-to-substrate distance, powder mass flow rate, linear velocity of spraying gun, were kept unchanged. The investigation confirmed influence of temperature and pressure on coating thickness as well as on the surface seterometry.

Tribological Behavior of Ni-Based Self-Lubricating Composites at Elevated Temperatures

2015 ◽  
pp. 72-106
Author(s):  
Jianliang Li ◽  
Dangsheng Xiong ◽  
Yongkun Qin ◽  
Rajnesh Tyagi
Keyword(s):  
High Temperature ◽  
Friction And Wear ◽  
Solid Lubricant ◽  
Elevated Temperatures ◽  
Wear Behavior ◽  
Composite Coatings ◽  
Solid Lubricants ◽  
Friction And Wear Behavior ◽  
Nickel Base ◽  
Self Lubricating Composites

This chapter illustrates the effect of the addition of solid lubricants on the high temperature friction and wear behavior of Ni-based composites. Ni-based composites containing solid lubricant particles both in nano and micrometer range have been fabricated through powder metallurgy route. In order to explore the possible synergetic action of a combination of low and high temperature solid lubricant, nano or micro powders of two or more solid lubricants were added in the composites. This chapter introduces the fabrication of the Ni-based self-lubricating composites containing graphite and/or MoS2, Ag and/or rare earth, Ag and/or hBN as solid lubricants and their friction and wear behavior at room and elevated temperatures. The chapter also includes information on some lubricating composite coatings such as electro-deposited nickel-base coating containing graphite, MoS2, or BN and graphene and their tribological characteristics.

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