Structural and wear properties of heat-treated electroless Ni-P alloy and Ni-P-Si3N4 composite coatings on iron based PM compacts

2016 ◽  
Vol 302 ◽  
pp. 528-534 ◽  
Author(s):  
Ulaş Matik
Keyword(s):  
Composite Coatings ◽  
Wear Properties ◽  
Heat Treated ◽  
Iron Based ◽  
Electroless Ni

Investigation of in situ synthesized TiB2 particles in iron-based composite coatings processed by hybrid submerged arc welding

2021 ◽  
Vol 63 (7) ◽  
pp. 630-638
Author(s):  
Mustafa Kaptanoglu ◽  
Mehmet Eroglu
Keyword(s):  
Arc Welding ◽  
Composite Coatings ◽  
Tib2 Particle ◽  
Submerged Arc Welding ◽  
Wear Properties ◽  
Gas Atmosphere ◽  
Iron Based ◽  
Tib2 Particles ◽  
Submerged Arc

Abstract In the study for this contribution, production of in situ synthesized TiB2 particles in iron-based composite coatings using four different submerged arc welding powders (fluxes) containing increasing amounts of ferrotitanium and ferroboron with S1 welding wire, were targeted. For this purpose, coating deposition was carried out to improve the hardness and wear properties of the AISI 1020 steel surfaces using hybrid submerged arc welding. In hybrid submerged arc welding, the welding pool is protected by both welding powders and an argon gas atmosphere. To examine the composite coatings, visual, chemical, microstructural analyses and hardness and wear tests were carried out. With the use of increasing amounts of ferrotitanium and ferroboron in the welding powders, it was observed that the microstructure of the coatings changed in terms of TiB2 particle geometries such as rectangular and hexagonal; volume fractions of TiB2 particles in the coating microstructures increased; hardness values of coatings were enhanced from 34 HRC to 41 HRC; the wear resistance of the coatings improved, and worn surface images of the coatings caused by the counter body changed from continuous with deep scratches to discontinuous with fine scratches and crater cavities.

MICROSTRUCTURE AND WEAR PROPERTIES OF LASER CLAD TiB2 + TiC/Fe COMPOSITE COATING

2012 ◽  
Vol 19 (05) ◽  
pp. 1250052 ◽  
Author(s):  
X. H. WANG ◽  
M. ZHANG ◽  
B. S. DU ◽  
S. LI
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Volume Fraction ◽  
Composite Coatings ◽  
Wear Properties ◽  
Friction Coefficients ◽  
Iron Based

Iron-based composite coatings reinforced with TiB2–TiC multiple ceramic have been fabricated from a precursor of B4C , TiO2 and Al powders by laser cladding. The effect of TiO2 and Al on the microstructure and wear properties of the coatings was investigated. The results showed that the volume fraction, type and size of the reinforcements were influenced by the content of TiO2 and Al . TiB2 and TiC were evenly distributed in the coating; however, most of Al2O3 were ejected from the coatings, only few of them retained in the coating acting as nucleation core of reinforcement or inclusion. The microhardness and wear resistance of the coatings were improved, whereas the friction coefficients of the coatings were considerably lower than that of substrate.

Investigation of Friction and Wear Properties of Electroless Ni–P–Cu Coating Under Dry Condition

2016 ◽  
Vol 04 (04) ◽  
pp. 1640013 ◽  
Author(s):  
Santanu Duari ◽  
Arkadeb Mukhopadhyay ◽  
Tapan Kr. Barman ◽  
Prasanta Sahoo
Keyword(s):  
Heat Treatment ◽  
Surface Morphology ◽  
Normal Load ◽  
Wear Depth ◽  
Wear Properties ◽  
Sliding Speed ◽  
Applied Normal Load ◽  
Heat Treated ◽  
Pin On Disc ◽  
Electroless Ni

This study presents the deposition and tribological characterization of electroless Ni–P–Cu coatings deposited on AISI 1040 steel specimens. After deposition, coatings are heat treated at 500[Formula: see text]C for 1[Formula: see text]h. Surface morphology study of the coatings reveals its typical cauliflower like appearance. Composition study of the coatings using energy dispersive X-ray analysis indicates that the deposit lies in the high phosphorus range. The coatings undergo crystallization on heat treatment. A significant improvement in microhardness of the coatings is also observed on heat treatment due to the precipitation of hard crystalline phases. The heat-treated coatings are subjected to sliding wear tests on a pin-on-disc type tribo-tester under dry condition by varying the applied normal load, sliding speed and sliding duration. The coefficient of friction (COF) increases with an increase in the applied normal load while it decreases with an increase in the sliding speed. The wear depth on the other hand increases with an increase in applied normal load as well as sliding speed. The worn surface morphology mainly indicates fracture of the nodules.

Electroless Ni-P-PTFE Composite Coatings on Titanium Alloy and Their Tribological Properties

2011 ◽  
Vol 291-294 ◽  
pp. 12-17 ◽  
Author(s):  
Zhong Dong Yang ◽  
Di Wu ◽  
Meng Fei Liu
Keyword(s):  
Titanium Alloy ◽  
Friction And Wear ◽  
Composite Coatings ◽  
Wear Properties ◽  
Ptfe Composite ◽  
Composite Plating ◽  
Lubricating Property ◽  
Plating Solution ◽  
Friction And Wear Properties ◽  
Electroless Ni

In this study, it was the first attempt to fabricate Ni-P-PTFE composite coatings on titanium alloy (manufactured through electroless composite plating). The effects of suspended PTFE concentration, temperature and surfactant concentration in the plating solution on the PTFE content in the resulting coatings were investigated. In addition, the friction and wear properties of the samples were analyzed. The results showed that co-deposition of Ni-P and PTFE can obviously decrease the friction coefficient of the coatings, reduce wear and improve lubricating property of the coatings.

Preparation and Tribological Behavior of Ni-P-B4C Electroless Coatings

2014 ◽  
Vol 809-810 ◽  
pp. 615-620
Author(s):  
Ying Wang ◽  
Wan Chang Sun ◽  
Hui Cai ◽  
Qing Hao Yang ◽  
Ju Mei Zhang
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Tribological Behavior ◽  
Composite Coatings ◽  
Micro Hardness ◽  
Wear Weight Loss ◽  
Heat Treated ◽  
Electroless Coatings ◽  
Electroless Ni ◽  
Minimum Wear

In this research, micro-hardness and wear resistance of two types of electroless coatings were investigated including Ni-P and Ni-P-B4C composite coatings. Dispersible B4C particles and electroless Ni-P alloy were codeposited on carbon steel by electroless plating and then heat treated at 200, 400 and 600 °C for 1 h, respectively. The cross-section morphology and microstructure of the composite coatings were characterized. Meanwhile, the micro-hardness and tribological behavior of composite coatings were evaluated. The results showed that the Ni-P-B4C composite coating presents better wear resistance in comparison with that of Ni-P coating. The Ni-P-B4C composite coating with heat treated at 400 °C exhibits high micro-hardness and good wear resistance, which the highest hardness is 1200 HV, the minimum wear weight loss is 0.12 mg and the lowest friction coefficient is 0.2054.

Tribological Properties of Al2O3 Particles Reinforced Ni-P Composite Coating

2017 ◽  
Vol 739 ◽  
pp. 148-151
Author(s):  
Chih I Hsu ◽  
Kung Hsu Hou ◽  
Ming Der Ger
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Deposition Process ◽  
Xrd Analysis ◽  
X Ray Diffraction ◽  
Heat Treated ◽  
Composite Deposits ◽  
Electroless Ni ◽  
Improve Wear Resistance

In this study, hardness and wear resistance of electroless Ni–P and Ni–P/Al2O3 composite coating have been investigated. These composite coatings are applied on iron substrate by electroless deposition process and then they were heat treated at 400°C for 1h. Surface and cross-section morphology of composite deposits have been investigated by scanning electron microscopy (SEM) and microstructural changes were evaluated by X-ray diffraction (XRD) analysis. The results showed that the Al2O3 particles co-deposited in Ni–P matrix led to an increase in the hardness and improve wear resistance, especially when the heat treated at 400°C will have the maximum hardness and wear resistance.

Optimization of Friction and Wear Properties of Electroless Ni-P-Al2O3 Composite Coatings

2014 ◽  
Vol 2 (2) ◽  
pp. 34-52
Author(s):  
Prasanta Sahoo ◽  
Prasanna Gadhari
Keyword(s):  
Friction Coefficient ◽  
Annealing Temperature ◽  
Composite Coatings ◽  
Principal Component ◽  
Composite Particles ◽  
Wear Depth ◽  
Wear Properties ◽  
Nickel Ions ◽  
Al2o3 Composite ◽  
Electroless Ni

Electroless Ni-P coatings with hard Al2O3 composite particles are developed on mild steel specimens. The coating parameters viz. source of nickel ions, concentration of reducing agent and concentration of Al2O3 particles are used as coating parameters to minimize wear rate (wear depth in µm) and friction coefficient. As annealing temperature strongly affects hardness and wear resistance of coating, it is considered as fourth parameter. In the present study wear depth and friction coefficient are used as response variables. To convert multiple responses into single performance index, Weighted Principal Component Analysis (WPCA) is used. Taguchi L27 OA with four process parameters at three levels is used to conduct the experiments. ANOVA is used to find out the significance of each coating parameters and their interactions. Annealing temperature is found to be the most significant factor followed by concentration of composite particles. The surface morphology, composition and phase structure analysis are done with the help of SEM, EDAX and XRD respectively.

Wear and Corrosion Resistance of High-Velocity Oxygen-Fuel Sprayed Iron-Based Composite Coatings

2013 ◽  
Author(s):  
A. Milanti ◽  
H. Koivuluoto ◽  
P. Vuoristo ◽  
G. Bolelli ◽  
F. Bozza ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
High Velocity ◽  
Composite Coatings ◽  
Electrochemical Behaviour ◽  
Microstructural Characterization ◽  
Wear Properties ◽  
Corrosion Properties ◽  
Wear And Corrosion ◽  
Iron Based

Thermally sprayed iron-based coatings are being widely studied as alternative solution to conventional hardmetal (cermet) and Ni-based coatings for wear and corrosion applications in order to reduce costs, limit environmental impact and enhance the health safety. The aim of the present work is to study the cavitation erosion behaviour in distilled water and the corrosion properties in acidic solution of four high-velocity oxy-fuel (HVOF) sprayed Fe-based composite coatings. Fe-Cr-Ni-B-C powder was selected for its good sliding wear properties. In addition, a powder composition with an addition of Mo was studied in order to increase the corrosion resistance whereas additions of 20 wt. % and 40 wt. % WC-12Co as blended powder mixtures were investigated in order to increase wear resistance. Improvement of coating properties was significant with the advanced powder compositions. Dense coating structures with low porosity were detected with microstructural characterization. In addition, good cavitation wear resistance was achieved. The cavitation resistance of customized Fe-based coating with Mo addition was reported to be twice as high as that of conventional Ni-based and WC-CoCr coatings. The corrosion properties of HVOF Fe-based coatings were also evaluated by studying electrochemical behaviour in order to analyse their potential to use as corrosion barrier coatings.

Friction and wear properties of electroless Ni-P- (IF-MoS2) composite coatings in humid air and vacuum

2006 ◽  
Vol 426 (1-2) ◽  
pp. 162-168 ◽  
Author(s):  
T.Z. Zou ◽  
J.P. Tu ◽  
S.C. Zhang ◽  
L.M. Chen ◽  
Q. Wang ◽  
...  
Keyword(s):  
Friction And Wear ◽  
Composite Coatings ◽  
Wear Properties ◽  
Humid Air ◽  
Friction And Wear Properties ◽  
Electroless Ni

Chemical deposition of hard composite coatings Ni–Cu–P–Cr2O3

2020 ◽  
pp. 179-181
Author(s):  
A.A. Abrashov A.A. ◽  
E.G. Vinokurov ◽  
M.A. Egupova ◽  
V.D. Skopintsev
Keyword(s):  
Chromium Oxide ◽  
Alkaline Solution ◽  
Composite Coatings ◽  
Chemical Deposition ◽  
Alkaline Solutions ◽  
Functional Surface ◽  
Heat Treated ◽  
Weakly Acid Solution ◽  
Coating Composition ◽  
Weakly Acidic Solution

The technological (deposition rate, coating composition) and functional (surface roughness, microhardness) characteristics of chemical composite coatings Ni—Cu—P—Cr2O3 obtained from weakly acidic and slightly alkaline solutions are compared. It is shown that coatings deposited from slightly alkaline solution contain slightly less phosphorus and chromium oxide than coatings deposited from weakly acid solution (2...3 % wt. phosphorus and up to 3.4 % wt. chromium oxide), formed at higher rate (24...25 microns per 1 hour of deposition at temperature of 80 °C), are characte rized by lower roughness and increased microhardness. The Vickers microhardness at 0.05 N load of composite coatings obtained from slightly alkaline solution and heat-treated at 400 °C for 1 hour is 13.5...15.2 GPa, which is higher than values for coatings deposited made of weakly acidic solution. The maximum microhardness of coatings is achieved at concentration 20 g/l of Cr2O3 particles. The technology of chemical deposition of Ni—Cu—P—Cr2O3 coatings formed in slightly alkaline solution is promising for obtaining of materials with increased hardness and wear resistance.

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