Wear mechanism of Ag as solid lubricant for wide range temperature application in micro-beam plasma cladded Ni60 coatings

2021 ◽  
pp. 107402
Author(s):  
Fuxing Ye ◽  
Zhi Lou ◽  
Yonghui Wang ◽  
Wensheng Liu
Keyword(s):  
Wear Mechanism ◽  
Solid Lubricant ◽  
Beam Plasma ◽  
Wide Range ◽  
Temperature Application

Application of WS2 in Solid Lubricant Coating for Metal

2013 ◽  
Vol 652-654 ◽  
pp. 1904-1907 ◽  
Author(s):  
Suo Xia Hou ◽  
Hui Gao ◽  
Xiao Ming Jia
Keyword(s):  
Friction And Wear ◽  
Solid Lubricant ◽  
Solid Lubricants ◽  
Feasibility Analysis ◽  
Solid Lubrication ◽  
Wear Testing ◽  
Metallic Materials ◽  
Solid Lubricant Coating ◽  
Wide Range ◽  
Performance Research

WS2has excellent tribological properties; it is emerging of lubricating materials. MoS2is commonly used solid lubricants and wide range of applications, but its poor heat resistance. WS2can well make up for the inadequate performance of the MoS2, but uses it as a solid lubricant in performance research on metallic materials. By friction and wear testing, the paper gets feasibility analysis of the application that WS2instead of MoS2in the field of solid lubrication, while exploring the synergies between them, laying the foundations for the manufacture of new types of composite lubrication coatings.

Foil Bearings Makes Oil-Free Turbocharger Possible

2005 ◽  
Author(s):  
Crystal A. Heshmat ◽  
Hooshang Heshmat ◽  
Mark J. Valco ◽  
Kevin C. Radil ◽  
Christopher Della Corte
Keyword(s):  
High Speed ◽  
Solid Lubricant ◽  
Load Capacity ◽  
Maximum Load ◽  
Solid Lubricant Coating ◽  
Foil Bearings ◽  
Wide Range ◽  
Rotor Bearing ◽  
Component Development ◽  
Bearing System

This paper describes an oil-free, 150 Hp turbocharger that was successfully operated with compliant foil bearings in a range of pitch and roll angles, including vertical operation, thereby demonstrating its viability for aircraft applications. On a gas test stand the turbocharger was operated to 120,000 rpm, under extreme conditions. In addition, the compliant foil bearing-supported turbocharger successfully tolerated shock and vibration of 40 g. Advanced technologies have been applied to the second generation of this turbocharger, shown in Figure 1, including self acting, compliant foil hydrodynamic air bearings with advanced coatings capable, of operation above 815 °C (1500°F). Journal foil bearings with maximum load capacity up to 670 kPa (97 psi) were used in conjunction with thrust foil bearings capable of maximum loads to 570 kPa (83 psi). Bearing component development tests demonstrated 30,000 start stop cycles at 815 °C (1500°F) with a newly developed, solid lubricant coating, KOROLON™. KOROLON™ exhibits a coefficient of friction of less than 0.1 at a wide range of temperatures. Current-designed foil bearings with KOROLON™ have immensely decreased turbolag, allowing acceleration from rest to over 100,000 rpm in less than 2 seconds. Advanced bearing stiffness maintained rotor total axial end-to-end motion within 100 microns (0.004 inch). Total radial static and dynamic motion was controlled within 25 microns (0.001 inch). Development of this high speed turbomachine included bearing and solid lubricant component development tests, rotor-bearing dynamic simulator qualification and gas stand tests of the assembled turbocharger. Gas stand and simulator test results revealed stable bearing temperatures, low rotor vibrations, good shock tolerance and the ability of the rotor bearing system to sustain overspeed conditions beyond 120,000 rpm. This combination of component and integrated rotor-bearing system technology addresses many of the issues associated with application of compliant foil bearings to industrial compressors, blowers, and gas turbine engines, overcoming many of the inherently show-stopping and debilitating features of rolling element bearings, i.e., speed and temperature limitations.

Thermal Stability of NiAl-Base Coatings for High Temperature Application

2005 ◽  
Vol 237-240 ◽  
pp. 709-714
Author(s):  
Robert Filipek ◽  
Marek Danielewski ◽  
E. Tyliszczak ◽  
M. Pawełkiewicz ◽  
S. Datta
Keyword(s):  
Thermal Stability ◽  
Gas Turbines ◽  
Inverse Method ◽  
Critical Role ◽  
Diffusion Coatings ◽  
Aluminide Coatings ◽  
Wide Range ◽  
Industrial Energy ◽  
Temperature Application ◽  
Thermal Stability Of

Aluminide diffusion coatings act as a remedy against the aggressive environments in which modern aero-gas turbines operate. Platinum addition to basic aluminide coatings significantly improves the oxidation resistance of these coatings. The increase in operating temperatures of industrial energy systems and gas turbines, has led to the extensive use of coatings capable of providing improved service life. Interdiffusion plays a critical role in understanding the integrity of such coatings. The Danielewski-Holly model of interdiffusion which allows for the description of a wide range of processes (including processes stimulated by reactions at interfaces) is employed for studying of interdiffusion in the Pt-modified β-NiAl coatings. Using the inverse method the intrinsic diffusivities of Ni, Al and Pt were calculated. Such obtained diffusivities were subsequently used for modelling of thermal stability of Pt-modified aluminide coatings in air and in argon atmosphere.

Some Aspects of Flat Surface Grinding with Intermittent Cross-Feed

1979 ◽  
Vol 101 (2) ◽  
pp. 135-146 ◽  
Author(s):  
J. K. Banerjee
Keyword(s):  
Wear Mechanism ◽  
Specific Energy ◽  
Flat Surface ◽  
Grinding Force ◽  
Wheel Wear ◽  
Material Combination ◽  
Force Relation ◽  
Wide Range ◽  
Constant Maximum ◽  
Force Equilibrium

Part I: A Wheel Wear Mechanism. Using a constant maximum grit-force hypothesis for a fixed wheel-work combination, a stable and progressive wear-land model is developed as a function of the machine settings and its mechanical and thermal limitations are discussed. Experiments conducted with several wheel-work materials, both during dry and wet grinding justify the proposed wear mechanism and its limitations with respect to the machine settings. Part II: The Force Equilibrium. Under a stable wear mechanism as proposed in Part I, the grinding force is shown to be a simple linear function of a combined machine settings’ parameter; the slope of the line gives, in the range of the machine settings used, a constant specific energy for a given wheel-work material combination. Thermal expansion as well as grit rubbing, while not necessarily altering the basic wear-land geometry, tend to change this force relation. Experimental results over a wide range of the machine settings and for different wheels and workpieces agree with the force relation, and the specific energy calculated therefrom coincides quantitatively with the other published results on similar workpiece materials.

Wear mechanism of coated tools in the turning of ductile cast iron having wide range of tensile strength

2017 ◽  
Vol 47 ◽  
pp. 46-53 ◽  
Author(s):  
Israel Martinez ◽  
Ryutaro Tanaka ◽  
Yasuo Yamane ◽  
Katsuhiko Sekiya ◽  
Keiji Yamada ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Cast Iron ◽  
Wear Mechanism ◽  
Ductile Cast Iron ◽  
Coated Tools ◽  
Wide Range

Solid Lubricant Containing Coatings for Cylinder Liners in Pressure Casted Aluminum Crankcases

2000 ◽  
Author(s):  
M. Buchmann ◽  
R. Gadow ◽  
A. Killinger
Keyword(s):  
Residual Stress ◽  
Solid Lubricant ◽  
Atmospheric Plasma Spraying ◽  
Thermal Spray Coatings ◽  
Atmospheric Plasma ◽  
Coating Materials ◽  
Spray Coatings ◽  
Wide Range ◽  
Cylinder Liners ◽  
Potential Use

Abstract This paper evaluates a wide range of thermal spray coatings for potential use lining cylinder bores in aluminum engines. Coatings were applied by atmospheric plasma spraying (APS) and high-velocity oxyfuel (HVOF) techniques. More than a dozen coating materials were screened, including ceramics, cermets, and metals. The paper describes the equipment and procedures used in the investigation and assesses the resulting coatings based on their microstructure, hardness, friction coefficient, wear resistance, bonding strength, and residual stress.

Enhancing the tribological and mechanical properties of M50 steel using solid lubricants – A detailed review

2017 ◽  
Vol 232 (5) ◽  
pp. 619-642 ◽  
Author(s):  
FA Essa ◽  
Qiaoxin Zhang ◽  
Xingjiu Huang ◽  
Ahmed Mohamed Mahmoud Ibrahim ◽  
Mohamed Kamal Ahmed Ali ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Tribological Properties ◽  
Solid Lubricant ◽  
Tribological Behavior ◽  
Solid Lubricants ◽  
Industrial Applications ◽  
Solid Lubricant Additives ◽  
Wide Range ◽  
Future Work ◽  
M50 Steel

Recent strides in contact mechanics of M50 steel offer unique opportunities for better and more control of its tribological behavior and mechanical properties under different contact and surrounding conditions. Most researchers have focused on the solid lubricants on M50 steel as the key strategy for improving the tribological properties. In this paper, we have selected a wide range of previous late studies to discuss the different mechanisms leading to an improvement in the tribological properties of M50 steel via solid lubricants. A discussion of M50 steel industrial applications is also reviewed. The main objective is to develop an exhaustive understanding of the tribological behavior of M50 steel with solid lubricant additives under different conditions and also provide some prospects to be considered for future work.

scholarly journals A Slurry-Pot Abrasive Wear Test Device for Several Composite Materials

2019 ◽  
Vol 4 (1) ◽  
pp. 437-444
Author(s):  
Hasan Muhandes ◽  
Gábor Kalácska
Keyword(s):  
Composite Materials ◽  
Abrasive Wear ◽  
Wear Mechanism ◽  
Wear Test ◽  
Test Machine ◽  
Agricultural Machinery ◽  
Test Device ◽  
Plate Test ◽  
Wide Range ◽  
Proper Material

To choose the proper material for agricultural machinery we tested several materials with abrasive cloth on the pin-on-plate test device. After having the pre-results, we launched more complex abrasive testing (slurry-pot) simulating more realistic mode with soils to investigate the abrasive wear mechanism and resistance of the selected up-to-date polymeric structural materials. for this, we developed a modified slurry-pot test machine that ensures the comparability of the materials over a wide range of conditions. Through this device, several parameters could be controlled like speed, the soil particle’s hit angle on the tested surface.

Effect of low temperatures on the wear mechanism of solid lubricant coatings in vacuum

Wear ◽  
1993 ◽  
Vol 160 (2) ◽  
pp. 351-359 ◽  
Author(s):  
G.D. Gamulya ◽  
T.A. Kopteva ◽  
I.L. Lebedeva ◽  
L.N. Sentyurikhina
Keyword(s):  
Wear Mechanism ◽  
Low Temperatures ◽  
Solid Lubricant
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