scholarly journals Influence of mechanical deflector assisted electroless nickel deposits for wear resistance

2021 ◽  
Vol 9 ◽  
Author(s):  
J.T. Winowlin Jappes ◽  
◽  
N.C. Brintha ◽  
M. Adam Khan ◽  
◽  
...  
Keyword(s):  
Wear Resistance ◽  
Electroless Nickel ◽  
Micro Hardness ◽  
Subsequent Increase ◽  
Coating Efficiency ◽  
Diamond Indenter ◽  
Nickel Deposits ◽  
Pin On Disc ◽  
Electroless Ni ◽  
Measuring Unit

This investigation reports the effect of mechanical deflector during coating on the mechanical properties of the Electroless Ni-P deposits. Micro hardness of the electroless Ni-P deposits was measured using shimadzu micro hardness measuring unit employing a diamond indenter and pin-on-disc wear tester was used to measure the wear resistance of the deposits. The characteristics of deposits produced in presence of mechanical deflector are found to be superior from those produced using conventional deposition techniques. Enhancement in properties are correlated with modified crystallinity and the conversion of Ni-P in to possible phosphides in the presence of mechanical deflector. It has been noticed that the coating efficiency has 30% hike with mechanical deflector. Annealing at 350ºC has reached the maximum hardness of 950 Hv and subsequent increase in wear resistance.

Assessment of Microstructure and Wear Resistance of Friction Stir Processed Cast Mg-Al-Zn Magnesium Alloy

2015 ◽  
Vol 787 ◽  
pp. 442-447 ◽  
Author(s):  
R. Jayaraman ◽  
T. Balusamy ◽  
A.K. Lakshminarayanan
Keyword(s):  
Wear Resistance ◽  
Magnesium Alloy ◽  
Base Metal ◽  
Second Phase ◽  
Micro Hardness ◽  
Friction Stir ◽  
Second Phase Particles ◽  
Metal Wear ◽  
Pin On Disc ◽  
Cast Magnesium

Microstructure, micro hardness and wear resistance of friction stir processed cast magnesium alloy are investigated in this work. Image analysis is used to differentiate the amount of phases present in the base metal and friction stir processed regions. Hardness mapping indicates that the frictions stir processed region has 64 % increase in microhardness compared to the base metal. Wear resistance was evaluated using pin-on-disc testing and it is found that the friction stir processed region has superior wear resistance compared to the base metal. Fine grains with uniformly distributed second phase particles are the reasons for improved microhardness and wear resistance of friction stir processed region.

scholarly journals Wear resistance of electroless nickel deposits.

1986 ◽  
Vol 37 (11) ◽  
pp. 665-670
Author(s):  
Ryozo NAKAMURA ◽  
Hiroshi ITO
Keyword(s):  
Wear Resistance ◽  
Electroless Nickel ◽  
Nickel Deposits

Heat Treated and As-Plated Electroless Duplex Ni-P/Ni-B Coatings: Evaluation of Hardness and Wear Resistance

2013 ◽  
Vol 853 ◽  
pp. 264-269 ◽  
Author(s):  
Gökce Dil ◽  
Ali Göksenli ◽  
Cagdas Calli ◽  
Faiz Muhaffel ◽  
Ali I. Aydeniz ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Electroless Nickel ◽  
Xrd Analysis ◽  
Maximum Value ◽  
Heat Treated ◽  
Pin On Disc ◽  
Substrate Steel ◽  
Duplex Coatings

The present work deals with the formation of NiP/NiB duplex coatings by electroless plating and evaluation of their hardness and wear resistance. The duplex coatings were prepared with Ni-P as the inner layer. To analyze the structure of the coatings, XRD analysis was carried out. According to the results, NiP and NiB coatings are amorphous in their as-plated condition and after applying heat-treatment at 450 °C for 1 h, both NiP and NiB coatings crystallize and produce nickel, nickel phosphide and nickel borides in the coatings. To determine the surface morphology and cross-section characteristics of the coatings, SEM observations were carried out and concluded that duplex coatings are uniform and good coherent exists between the duplex layers and the coatings are also connected closely to the substrate. The hardness of electroless nickel duplex coatings increased with applying heat treatment and reached maximum value at coatings annealed at 400 °C. To analyze the tribological properties, pin-on-disc tests were carried out. The wear track patterns on the coatings and on Al2O3balls were then examined by optical microscopy and EDS. The friction coefficient and wear rate of the coatings were lower than the substrate steel. Friction coefficient decreased from 0.43 to 0.36 and wear resistance decreased from 11.3 to 6.4 by applying heat treatment at 450 °C for 1 h to duplex coatings.

Abrasive Wear on Heat-Treated Recycling Aluminium AA6061 of Various Reinforcement Materials through Powder Metallurgical Process

2017 ◽  
Vol 909 ◽  
pp. 15-20 ◽  
Author(s):  
Ahmed Sahib Mahdi ◽  
Mohammad Sukri Mustapa ◽  
Mohd Radzi Mohamed Yunus ◽  
Mohd Rasidi Ibrahim ◽  
Muhammad Irfan Ab Kadir ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Weight Loss ◽  
Wear Resistance ◽  
Wear Test ◽  
Metallurgical Process ◽  
Micro Hardness ◽  
Powder Metallurgical Process ◽  
Heat Treated ◽  
Pin On Disc ◽  
Is Value

The present study is aimed at investigating wear resistance of the heat treated of recycled aluminium type AA6061 for various reinforced methods (heat treatment reinforced by graphite and silica) using pin on disc method. In the study, weight loss value of the recycled chip of AA6061 was observed. Eight specimens were taken for the wear test. The results showed that the wear resistance increased for specimens treated by heat treatment. This increase in wear resistance is value of micro hardness which increased with the increase of the percentage of silica reinforcement. Thus, the weight loss decreased and the volume loss also decreased.

Comparison of Various Electroless Nickel Coatings on Steel: Structure, Hardness and Abrasion Resistance

2014 ◽  
Vol 783-786 ◽  
pp. 1405-1413 ◽  
Author(s):  
Véronique Vitry ◽  
Adeline Sens ◽  
Fabienne Delaunois
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Steel Substrate ◽  
Steel Structure ◽  
Electroless Nickel ◽  
Scratch Testing ◽  
Nickel Coatings ◽  
Heat Treated ◽  
Nickel Deposits ◽  
Heat Treated Condition

Several electroless nickel deposits, on steel substrate, of varying chemistry were investigated in the as-plated and heat-treated condition: 3 nickel-phosphorous (low, mid and high P) and 2 nickel-boron (nickel-boron (lead) and nickel-boron (thallium)). Samples were characterized by SEM and X-ray diffraction. They were then submitted to Knoops microhardness testing and Taber abrasion tests, with abrasive CS-10 wheels, as well as scratch testing to investigate their mechanical properties and wear resistance. Hardness and wear resistance of all deposits were improved by heat treatment, but the best candidate was the Nickel-boron (lead), with a hardness over 1100 hk50 after heat treatment and a Taber Wear Index of 6. Scratch testing allowed identifying the damage mechanisms of the coated systems.

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.

scholarly journals Comparative Study of Tribological Behavior of Electroless Ni–B, Ni–B–Mo, and Ni–B–W Coatings at Room and High Temperatures

Lubricants ◽  
2018 ◽  
Vol 6 (3) ◽  
pp. 67 ◽  
Author(s):  
Arkadeb Mukhopadhyay ◽  
Tapan Barman ◽  
Prasanta Sahoo ◽  
J. Davim
Keyword(s):  
High Temperatures ◽  
Coefficient Of Friction ◽  
Tribological Behavior ◽  
Electroless Nickel ◽  
Ternary Alloys ◽  
Nickel Coatings ◽  
Pin On Disc ◽  
Coating Characteristics ◽  
Steel Substrates ◽  
Electroless Ni

Ni–B alloys deposited by the electroless method are considered to be hard variants of the electroless nickel family. Inclusion of Mo or W to form ternary alloys improves the thermal stability of electroless nickel coatings. Therefore, in the present work, Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited; and their tribological behavior at room and high temperatures are investigated. Electroless Ni–B, Ni–B–Mo, and Ni–B–W coatings are deposited on AISI 1040 steel substrates. The coatings are heat treated to improve their mechanical properties and crystallinity. Tribological behavior of the coatings is determined on a pin-on-disc type tribological test setup using various applied normal loads (10–50 N) and sliding speeds (0.25–0.42 m/s) to measure wear and coefficient of friction at different operating temperatures (25 °C–500 °C). Ni–B–W coatings are observed to have higher wear resistance than Ni–B or Ni–B–Mo coatings throughout the temperature range considered. Although for coefficient of friction, no such trend is observed. The worn surface of the coatings at 500 °C is characterized by lubricious oxide glazes, which lead to enhanced tribological behavior compared with that at 100 °C. A study of the coating characteristics such as composition, phase transformations, surface morphology, and microhardness is also carried out prior to tribological tests.

Analysis of electroless nickel thin films

1991 ◽  
Vol 49 ◽  
pp. 510-511 ◽  
Author(s):  
C. W. Price ◽  
E. F. Lindsey
Keyword(s):  
Thin Films ◽  
Inertial Confinement Fusion ◽  
Electroless Nickel ◽  
Inertial Confinement ◽  
Plating Bath ◽  
X Ray ◽  
Nickel Thin Films ◽  
Nickel Deposits ◽  
Confinement Fusion ◽  
Thickness Measurements

Thickness measurements of thin films are performed by both energy-dispersive x-ray spectroscopy (EDS) and x-ray fluorescence (XRF). XRF can measure thicker films than EDS, and XRF measurements also have somewhat greater precision than EDS measurements. However, small components with curved or irregular shapes that are used for various applications in the the Inertial Confinement Fusion program at LLNL present geometrical problems that are not conducive to XRF analyses but may have only a minimal effect on EDS analyses. This work describes the development of an EDS technique to measure the thickness of electroless nickel deposits on gold substrates. Although elaborate correction techniques have been developed for thin-film measurements by x-ray analysis, the thickness of electroless nickel films can be dependent on the plating bath used. Therefore, standard calibration curves were established by correlating EDS data with thickness measurements that were obtained by contact profilometry.

ENPLATE NI-423

Alloy Digest ◽  
1986 ◽  
Vol 35 (11) ◽  
Keyword(s):  
Wear Resistance ◽  
Physical Properties ◽  
Surface Treatment ◽  
High Speed ◽  
Chemical Reduction ◽  
Electronic Devices ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Corrosion And Wear ◽  
Phosphorus Alloy

Abstract ENPLATE NI-423 is a nickel-phosphorus alloy deposited by chemical reduction without electric current. It is deposited by a stable, relatively high-speed functional electroless nickel process that produces a low-stress coating with good ductility and excellent resistance to corrosion. Its many uses include equipment for chemicals and food, aerospace components, molds and electronic devices. This datasheet provides information on composition, physical properties, and hardness. It also includes information on corrosion and wear resistance as well as heat treating, machining, joining, and surface treatment. Filing Code: Ni-343. Producer or source: Enthone Inc..

scholarly journals The Impact of Heat Treatment on the Behavior of a Hot-Dip Zinc Coating Applied to Steel During Dry Friction

Materials ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 660
Author(s):  
Dariusz Jędrzejczyk ◽  
Elżbieta Szatkowska
Keyword(s):  
Heat Treatment ◽  
Wear Resistance ◽  
Friction Coefficient ◽  
Dry Friction ◽  
Zinc Coating ◽  
Pin On Disc ◽  
The One ◽  
The Impact ◽  
Coating Hardness ◽  
Anticorrosion Properties

The analyzed topic refers to the wear resistance and friction coefficient changes resulting from heat treatment (HT) of a hot-dip zinc coating deposited on steel. The aim of research was to evaluate the coating behavior during dry friction after HT as a result of microstructure changes and increase the coating hardness. The HT parameters should be determined by taking into consideration, on the one hand, coating wear resistance and, on the other hand, its anticorrosion properties. A hot-dip zinc coating was deposited in industrial conditions (according EN ISO 10684) on disc-shaped samples and the chosen bolts. The achieved results were assessed on the basis of tribological tests (T11 pin-on-disc tester, Schatz®Analyse device, Sindelfingen, Germany), microscopic observations (with the use of optical and scanning microscopy), EDS (point and linear) analysis, and microhardness measurements. It is proved that properly applied HT of a hot-dip zinc coating results in changes in the coating’s microstructure, hardness, friction coefficient, and wear resistance.

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