Material Modifications (Coatings, Treatments, etc.) for Tribological Applications

2021 ◽  
pp. 335-362
Keyword(s):  
Thermal Spray ◽  
Friction And Wear ◽  
Chemical Conversion ◽  
Heat Treating ◽  
Relative Effect ◽  
Solid Film

Abstract This chapter covers coatings and treatments that are used to improve the friction and wear behaviors of materials. It describes modifications that work by hardening contacting surfaces, including heat treating, vacuum coating, thermal spray, and plating, and those that separate or lubricate surfaces, including solid film, chemical conversion, and vacuum coatings, surface oiling and texturing, and lubricating platings. It compares and contrasts methods based on thickness and depth and their relative effect on friction, erosion, and wear.

Tribological Performance Optimization of Electroless Nickel Coatings Under Lubricated Condition

2018 ◽  
pp. 250-280 ◽  
Author(s):  
Santanu Duari ◽  
Arkadeb Mukhopadhyay ◽  
Tapan Kumar Barman ◽  
Prasanta Sahoo
Keyword(s):  
Performance Optimization ◽  
Friction And Wear ◽  
Electroless Nickel ◽  
Heat Treating ◽  
Wear Depth ◽  
X Ray Diffraction ◽  
X Ray ◽  
Heat Treated ◽  
Electroless Ni ◽  
Scanning Electron

The present chapter aims to determine optimal tribo-testing condition for minimum coefficient of friction and wear depth of electroless Ni-P, Ni-P-W and Ni-P-Cu coatings under lubrication using grey relational analysis. Electroless Ni-P, Ni-P-W and Ni-P-Cu coatings are deposited on AISI 1040 steel substrates. They are heat treated at suitable temperatures to improve their hardness. Coating characterization is done using scanning electron microscope, energy dispersive X-Ray analysis and X-Ray diffraction techniques. Typical nodulated surface morphology is observed in the scanning electron micrographs of all the three coatings. Phase transformation on heat treating the deposits is captured through the use of X-Ray diffraction technique. Vicker's microhardness of the coatings in their as-deposited and heat treated condition is determined. Ni-P-W coatings are seen to exhibit the highest microhardness. Friction and wear tests under lubricated condition are carried out following Taguchi's experimental design principle. Finally, the predominating wear mechanism of the coatings is discussed.

The analysis of the self-lubricating behavior and local failure mechanism of silver-rich solid film

2018 ◽  
Vol 70 (8) ◽  
pp. 1560-1568
Author(s):  
Xiaoxue Li ◽  
Kang Yang ◽  
Hongru Ma ◽  
Haibo Lin ◽  
Yukun Han ◽  
...  
Keyword(s):  
Failure Mechanism ◽  
Friction And Wear ◽  
Wear Behavior ◽  
The Self ◽  
Wear Scar ◽  
Local Failure ◽  
Wear Property ◽  
Shearing Stress ◽  
Content Type ◽  
Solid Film

Purpose The main aim of this paper was to study the self-lubricating behavior and failure mechanism of silver-rich solid film for in-depth analyzing of the friction and wear property of TiAl-10 wt. per cent Ag self-lubricating composite. Design/methodology/approach The friction and wear property of TiAl-10 wt. per cent Ag self-lubricating composite sliding against Si3N4 ball was tested under the testing conditions of ball-on-disk wear system. Field emission scanning electron microscopy and electron probe microanalyzer were used to analyze the surface morphology of silver-rich solid film. The main element contents were tested by energy dispersive spectroscopy. Silver phase on wear scar could be well identified using X-ray photo-electron spectroscopy. The theory calculation of shearing stress on wear scar was executed to discuss the local failure mechanism of silver-rich solid film. The lubricating role of silver was also discussed to analyze the anti-friction and anti-wear behavior of silver-rich solid film. Findings The friction coefficients and wear rates of TASC gradually reduced at 0-65 min, and approached to small values (0.31 in friction coefficient and 3.10×104 mm3N-1m-1 in wear rate) at 65-75 min. The excellent friction and wear behavior of TASC was mainly attributed to the lubricating property of silver-rich film at 65-75 min. At 12→20 N, surface shearing stress increased up to 146.31 MPa, and exceeded more than the shearing strength (125 MPa) of silver-rich film, which caused the propagating of fatigue crack and the destroying of silver-rich film, leading to high friction and severe wear. Originality/value It is important that the self-lubricating behavior and local failure of solid film is explored for further understanding the friction and wear property of TiAl alloys.

scholarly journals The Friction and Wear Properties of PTFE Composite-Thermal Spray Metallic Binary Coatings

2005 ◽  
Vol 46 (1) ◽  
pp. 84-87 ◽  
Author(s):  
Meigin Shi ◽  
Fujimasa Miyazawa ◽  
Shogo Tobe ◽  
T. A. Stolarski
Keyword(s):  
Thermal Spray ◽  
Friction And Wear ◽  
Wear Properties ◽  
Ptfe Composite ◽  
Friction And Wear Properties

scholarly journals Tribological Evaluation of Lead-Free MoS2-Based Solid Film Lubricants as Environmentally Friendly Replacements for Aerospace Applications

Lubricants ◽  
2022 ◽  
Vol 10 (1) ◽  
pp. 7
Author(s):  
Parikshit Tonge ◽  
Amit Roy ◽  
Payank Patel ◽  
Charles J. Beall ◽  
Pantcho Stoyanov
Keyword(s):  
Friction And Wear ◽  
Tribological Behavior ◽  
Wear Test ◽  
Solid Lubricants ◽  
Ex Situ ◽  
Sustainable Environment ◽  
Aerospace Applications ◽  
Solid Film ◽  
Parallel Direction ◽  
Green Lubricant

Solid lubricants, such as MoS2 have been widely used in the aerospace industry with the primary purpose of reducing the friction and wear of tribological interfaces. MoS2 based solid film lubricants are generally doped with other compounds, which can help overcome some of their limitations related to environmental conditions. For instance, compounds like Sb2O3 and Pb have been traditionally used to improve the endurance life of these lubricants. However, with the recent zest in transferring to eco-friendly lubricants, there is a strong push to eliminate Pb based compounds. The main purpose of this work is to better understand the influence of Pb based compounds on the tribological behavior of MoS2 based solid film lubricants as well as to critically evaluate the performance of Pb free lubrication strategies. More specifically, the baseline ‘non-green’ lubricant was doped with Pb compound and Sb2O3 and the Pb compound in the ‘Green’ alternative lubricant was replaced by more Sb2O3. The wear test was done using a ball-on-disk tribometer for specific loads and for 5000 cycles. Ex-situ analysis was conducted using Scanning Electron Microscope (SEM), Atomic Force Microscopy (AFM), and micro-Raman to capture the interfacial processes of these lubricants at different loads. Overall, the non-green lubricant performed better in terms of the tribological behavior (i.e., lower friction and wear), which was attributed to the formation of a dense MoS2-based tribo-/transfer-film with the basal planes oriented in the parallel direction to the sliding. The finding on the interfacial phenomena provided critical insights into the development of novel green alternatives that may have the ability to replace Pb based compounds in the future for a sustainable environment.

COLMONOY NO. 63HV

Alloy Digest ◽  
2008 ◽  
Vol 57 (9) ◽  
Keyword(s):  
Surface Treatment ◽  
Thermal Spray ◽  
High Velocity ◽  
Base Alloy ◽  
Heat Treating ◽  
High Velocity Oxygen Fuel ◽  
Nickel Base Alloy ◽  
Powder Metal ◽  
Nickel Base ◽  
Oxygen Fuel

Abstract Colmonoy No. 63HV is a nickel-base alloy recommended for hard surfacing parts to resist wear, corrosion, heat, and galling. The hardness of Colmonoy 63HV ranges to 58–61 HRC, and it is resistant to abrasion. Colmonoy 63HV is sized exclusively for high-velocity oxygen-fuel thermal spray systems. This datasheet provides information on composition. It also includes information on heat treating, surface treatment, and powder metal forms. Filing Code: Ni-665. Producer or source: Wall Colmonoy Corporation.

Tribological Properties of MoS2 Thin Coatings under Liquid Lubricating

2013 ◽  
Vol 273 ◽  
pp. 221-224
Author(s):  
Y. Bai ◽  
P. Cao
Keyword(s):  
Friction And Wear ◽  
Room Temperature ◽  
Oil And Grease ◽  
Wear Performance ◽  
Thin Coatings ◽  
Solid Films ◽  
Start Up ◽  
Mos2 Film ◽  
Solid Film ◽  
Lubrication Conditions

The objective of this study is to investigate the effect of solid and liquid lubrication on friction and wear performance of selected solid lubricating coatings, comparative experiments have been carried out on magnetron sputtered MoS2 coatings against Si3N4 ball using a ball-on-disk tribo-tester under the conditions of room temperature and different lubrication. Surface morphology of coatings were investigated by atom force microscope (AFM), and friction coefficient (COF) and wear rate of solid films were also be analyzed. It was shown that the friction is greatly reduced when the solid film is lubricated with oil and grease simultaneously in comparison with single-lubricant lubrication at the start-up or under boundary lubrication conditions. Liquid lubrication causes a dramatic decrease of the wear-ability of the MoS2 coatings. The effect of oil lubrication to the deterioration of wear resistance of MoS2 film was even worse than lubrication grease.

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