Wear Resistance of Aluminium Powder Composites Containing Solid Lubricants

1993 ◽  
Vol 79-80 ◽  
pp. 365-376 ◽  
Author(s):  
M.A. Zamzam ◽  
A. El-Kharbotly
Keyword(s):  
Wear Resistance ◽  
Solid Lubricants ◽  
Aluminium Powder ◽  
Powder Composites

scholarly journals Enhanced Wear Behaviour of Spark Plasma Sintered AlCoCrFeNiTi High-Entropy Alloy Composites

Materials ◽  
2018 ◽  
Vol 11 (11) ◽  
pp. 2225 ◽  
Author(s):  
Martin Löbel ◽  
Thomas Lindner ◽  
Thomas Lampke
Keyword(s):  
Wear Resistance ◽  
High Hardness ◽  
Solid Lubricants ◽  
Wear Behaviour ◽  
High Entropy Alloy ◽  
Surface Protection ◽  
High Entropy ◽  
Production Route ◽  
The Coefficient Of Friction ◽  
Spark Plasma

High hardness and good wear resistance have been revealed for the high-entropy alloy (HEA) system AlCoCrFeNiTi, confirming the potential for surface protection applications. Detailed studies to investigate the microstructure and phase formation have been carried out using different production routes. Powder metallurgical technologies allow for much higher flexibility in the customisation of materials compared to casting processes. Particularly, spark plasma sintering (SPS) enables the fast processing of the feedstock, the suppression of grain coarsening and the production of samples with a low porosity. Furthermore, solid lubricants can be incorporated for the improvement of wear resistance and the reduction of the coefficient of friction (COF). This study focuses on the production of AlCoCrFeNiTi composites comprising solid lubricants. Bulk materials with a MoS2 content of up to 15 wt % were produced. The wear resistance and COF were investigated in detail under sliding wear conditions in ball-on-disk tests at room temperature and elevated temperature. At least 10 wt % of MoS2 was required to improve the wear behaviour in both test conditions. Furthermore, the effects of the production route and the content of solid lubricant on microstructure formation and phase composition were investigated. Two major body-centred cubic (bcc) phases were detected in accordance with the feedstock. The formation of additional phases indicated the decomposition of MoS2.

Comparative study of different solid lubricants towards friction stability in a non-asbestos disc brake pad

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Baskara Sethupathi P. ◽  
Chandradass J.
Keyword(s):  
Wear Resistance ◽  
Testing Machine ◽  
Synergetic Effect ◽  
Solid Lubricants ◽  
Metal Sulfides ◽  
Disc Brake ◽  
Mechanical And Thermal Properties ◽  
Brake Pad ◽  
Content Type ◽  
Brake Pads

Purpose This study aims to compare the influence of different solid lubricants on the friction stability of a non-asbestos disc brake pad. Design/methodology/approach Three brake pads were developed using three lubricants, namely, non-asbestos brake pad with sulfide mix (NASM), non-asbestos brake pad with bismuth sulfide (NABS) and non-asbestos brake pad with molybdenum disulfide (NAMO). Sulfide mix was indigenously developed by physically mixing friction modifiers, alkaline earth chemicals and various metallic sulfides homogeneously dispersed in graphite medium. The physical, chemical, mechanical and thermal properties of brake pads were characterized as per industrial standards. The tribological performances were studied using the Chase testing machine as SAE-J661-2012. The worn surface of the pads was studied using scanning electron microscope to analyze the dominating wear mechanism. Findings NASM was excellent in fade as well as wear resistance. NABS was better from a wear point of view, but fade resistance was moderate despite its higher cost. NAMO fared average in fade and wear despite its excellent dry lubricating properties. NASM was excellent in terms of fade as well as wear resistance. Originality/value Among the selected metal sulfides, the indigenously developed sulfide mix was better than the other two sulfides, which indicates that the synergetic effect of metal sulfides was always preferable to the individual sulfides.

Mechanical and Tribological Properties of Nylon 1212 Modified with Brown Corundum Ash and Solid Lubricants

2011 ◽  
Vol 295-297 ◽  
pp. 1573-1577 ◽  
Author(s):  
Gao Liang Zhang ◽  
Qing Xiang Zhao ◽  
Min Ying Liu ◽  
Peng Fu ◽  
Yi Bo Yu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Environmental Pollution ◽  
Tribological Properties ◽  
Tribological Property ◽  
Solid Lubricants ◽  
Screw Extruder ◽  
Mechanical And Tribological Properties ◽  
Ptfe Composite ◽  
Twin Screw

Brown Corundum Ash(BCA) was used to modify nylon 1212(PA1212), which is produced during the production of electric fused brown corundum alumina and will causes serous environmental pollution if it is not recycled. In order to improve the tribological property of PA1212 composites, Graphite, MoS2 and PTFE were used. The composites were prepared by a twin-screw extruder through melt intercalation. The mechanical properties and the wear resistance of the PA1212/Brown Corundum Ash/graphite/MoS2/PTFE composite were studied. The shearing area of composite and the worn surfaces were examined by scanning electric microscope (SEM).

The effect of CaF2 and BaF2 solid lubricants on wear resistance of laserborided 100CrMnSi6-4 bearing steel

2017 ◽  
Vol 1 (86) ◽  
pp. 15-23
Author(s):  
A. Piasecki ◽  
M. Kotkowiak ◽  
M. Kulka
Keyword(s):  
Wear Resistance ◽  
Laser Beam ◽  
Wear Test ◽  
Solid Lubricants ◽  
Bearing Steel ◽  
Wear Behaviour ◽  
Beam Power ◽  
Dry Sliding Wear ◽  
Laser Alloying ◽  
X Ray

Purpose: In this paper, laser alloying with boron and solid lubricants was used in order to produce the self-lubricating layer on 100CrMnSi6-4 bearing steel. The influence of CaF2 and BaF2 on microstructure, hardness, chemical and phase composition as well as wear resistance of the layers was studied. Design/methodology/approach: The two-step process was used during laser alloying. First, the surface of the specimen was coated by a paste with alloying material. The alloying material consisted of the mixture of amorphous boron and self-lubricating additions (CaF2 and BaF2). Next, the surface was re-melted by a laser beam using TRUMPF TLF 2600 Turbo CO2 laser. The laser beam power 1.43 kW was used for laser alloying. The layer was characterized using X-ray diffraction, Scanning Electron Microscopy, Energy Dispersive Spectroscopy, microhardness tester. The dry sliding wear behaviour of the layer was investigated using the Amsler type wear test. Findings: The tribofilm, consisting of solid lubricants, was observed on the worn surfaces of laser-alloyed layers. It caused an increase in the wear resistance at room temperature. The presence of calcium fluoride and barium fluoride was confirmed in laser-alloyed layers using XRD and X-ray microanalysis by EDS method. Practical implications: Laser surface modification with solid lubricants had the important cognitive significance and gives grounds to the practical employment of this technology for reducing the abrasive wear. Originality/value: The wear mechanism of surface layer with solid lubricants was determined. The produced layer with laser alloying layers of boron and solid lubricant (CaF2 or BaF2) was compared.

Investigation on Wear Behavior of Electrostatic Micro-Solid Lubricant Coatings Under Dry Sliding Conditions

2012 ◽  
Author(s):  
UmaMaheshwera Reddy Paturi ◽  
Narala Suresh Kumar Reddy
Keyword(s):  
Wear Resistance ◽  
Solid Lubricant ◽  
Wear Behavior ◽  
Spray Coating ◽  
Solid Lubricants ◽  
Dry Sliding Wear ◽  
Wear Volume ◽  
Dry Sliding ◽  
Molybdenum Disulphide ◽  
Aluminum Specimen

Dry sliding experiences high friction and wear thus influencing the life and quality of the parts under sliding. To provide low friction and improve wear resistance, solid lubricants have an edge over conventional choice. This article features a specific study of the application of solid lubricant in dry sliding operations and presents its influence on wear resistance. Using a pin-on-disc tribometer designed according to ASTM G99 standard, dry sliding wear tests on aluminum alloy AA6351-T6 specimens were performed against uncoated EN31 steel and molybdenum disulphide (MoS2) coated EN31 steel discs. In this study, counter surfaces (discs) were coated with micron sized MoS2 solid lubricant powder particles using electrostatic spray coating (ESC) method. The best results for wear volume and friction coefficient (minimum values) were registered when aluminum specimen slid against MoS2 coated EN31 steel. Outcome of this study shows that the presence of solid lubricant film on disc specimen will greatly influence the sliding performance of pin material in lubricating and preventing wear through reduction in the frictional force due to presence of lamellar structure as a transfer film and favorable change in sliding interaction.

Effect of bonding agents on natural rubber–aluminium powder composites

2000 ◽  
Vol 14 (9) ◽  
pp. 1105-1117 ◽  
Author(s):  
V.S. Vinod ◽  
Siby Varghese ◽  
Baby Kuriakose
Keyword(s):  
Natural Rubber ◽  
Bonding Agents ◽  
Aluminium Powder ◽  
Powder Composites

scholarly journals Type and concentration effects of particulate solid lubricants on the microstructure, friction, and wear of electrodeposited Ni composite coatings

2018 ◽  
Vol 233 (6) ◽  
pp. 965-974 ◽  
Author(s):  
Dorra Trabelsi ◽  
Manel Zouari ◽  
Mohamed Kharrat ◽  
Maher Dammak ◽  
Marielle Eyraud ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Composite Coatings ◽  
Solid Lubricants ◽  
Concentration Effects ◽  
Graphite Particles ◽  
Average Grain Size ◽  
Particulate Solid ◽  
Optimal Value ◽  
The Matrix ◽  
Nickel Electrolyte

Nickel–MoS2 composite coatings were obtained by electrodeposition from a nickel electrolyte containing suspended MoS2 particles. The coating composition, morphology, crystalline structure, microhardness, and frictional behavior were studied as a function of MoS2 concentration. The results obtained in this study revealed that the codeposited lubricant particles strongly influenced the composite nickel coating properties. It was found that increasing codeposited MoS2 decreases the average grain size of nickel crystallites and leads to the formation of clusters which, in turn, lead to rough coatings with a high and variable thickness. The results of tribological response indicated that the reduction of friction coefficient and the improvement of wear resistance were performed until an optimal value of MoS2 concentration, which provided the best condition that promoted the tribo-layer stability and maintained the matrix integrity. A comparison of tribological and micromechanical properties between the coating containing the optimal fraction of MoS2 particles and the coating containing nearly the same fraction of graphite particles has been undertaken. Unlike the case of the addition of graphite particles, the microhardness of composite coating has been enhanced with the incorporation of MoS2 particles. However, the incorporation of graphite particles in the coating induced more effective lubrication and wear resistance.

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