Wear resistance of injection moulded PLA-talc engineered bio-composites: Effect of material design, thermal history and shear stresses during melt processing

Wear ◽  
2017 ◽  
Vol 390-391 ◽  
pp. 184-197 ◽  
Author(s):  
C. Aversa ◽  
M. Barletta ◽  
E. Pizzi ◽  
M. Puopolo ◽  
S. Vesco
Keyword(s):  
Wear Resistance ◽  
Thermal History ◽  
Material Design ◽  
Melt Processing ◽  
Shear Stresses

Mechanical Characterization of a Nanotube-Polyethylene Composite Material

Materials ◽  
2003 ◽  
Author(s):  
Michael H. Santare ◽  
Wenzhong Tang ◽  
John E. Novotny ◽  
Suresh G. Advani
Keyword(s):  
Wear Resistance ◽  
Carbon Nanotube ◽  
Matrix Material ◽  
Peak Load ◽  
Composite Films ◽  
Melt Processing ◽  
Polyethylene Composite ◽  
Punch Test ◽  
The Matrix

High-density polyethylene (HDPE) was used as the matrix material for a carbon nanotube (CNT) polymer composites. Multi-wall carbon nanotube composite films were fabricated using the melt processing method. Composite samples with 0%, 1%, 3% and 5% nanotube content by weight were tested. The mechanical properties of the films were measured by the small punch test and wear resistance was measured with a block-on-ring wear tester. Results show increases in the stiffness, peak load, work-to-failure and wear resistance with increasing nanotube content.

420 Material Design and Application of SPS for the Improvement of Wear Resistance of High-Strength Steel

2014 ◽  
Vol 2014.67 (0) ◽  
pp. _420-1_-_420-2_
Author(s):  
Ayako NAGASE ◽  
Takuya NAKAMURA ◽  
Kosei IDICHI ◽  
Yuzo NAKAMURA ◽  
Ryuichi IWAMOTO
Keyword(s):  
Wear Resistance ◽  
High Strength Steel ◽  
High Strength ◽  
Material Design ◽  
Design And Application

scholarly journals Evaluation of operational properties of aviation oils by tribological parameters

2021 ◽  
Vol 99 (1) ◽  
pp. 43-50
Author(s):  
O. Mikosianchyk ◽  
◽  
O. Yakobchuk ◽  
R. Mnatsakanov ◽  
A. Khimko ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Hydrodynamic Lubrication ◽  
Practical Significance ◽  
Shear Stresses ◽  
Specific Work ◽  
Friction Contact ◽  
Near Surface ◽  
Antifriction Properties ◽  
Lubrication Mode ◽  
Contact Surfaces

The quality of aviation oils was evaluated online on the basis of their lubricating, antifriction, rheological and antiwear properties in the friction contact. The use of the software and hardware complex for evaluation of operational characteristics of triboelements is offered. Approbation of the proposed methodology was performed on aviation oils SM-9. The increase in antifriction properties of the “Bora B” SM-9 oil was established to be due to the formation of limiting adsorption layers of lubricant on friction-activated contact surfaces, which are characterized by low shear stresses of the lubricant, and their structuring provides high effective viscosity in the contact at a level of 5142 Pa.s. It was revealed that at start-up the lubricant temperature is 20 0С and the mixed lubrication mode prevails, but with increasing the lubricant temperature to 100 0С the elastic-hydrodynamic (contact-hydrodynamic) lubrication mode dominates, then at maximum rotation speed of friction pairs the hydrodynamic lubrication mode dominates, regardless of oil temperature, which indicates the effective separation of the contact surfaces due to the formation of a lubricating layer between them. Analysis of the specific work of friction in the friction contact showed that the instability of this parameter evidences to intensification of destructive processes in the near-surface layers of metal and reduction in its wear resistance. The decrease in wear resistance of the lagging surface in the conditions of rolling with sliding for all types of investigated oils is due to the different directions of the friction force vector in the contact. In the course of operation of friction pairs in nonstationary conditions, the softening of the surface metal layers occurs, which has a positive effect on the tribological processes in the contact. The practical significance of the work consists in developing a methodology of analysis of lubricants, which makes it possible to more accurately evaluate their performance and provide recommendations for the choice of lubricant for specific friction units.

scholarly journals Development of methods for evaluation of lubrication properties of hydraulic aviation oils

2021 ◽  
Vol 101 (3) ◽  
pp. 42-47
Author(s):  
T. Ilina
Keyword(s):  
Wear Resistance ◽  
Rheological Properties ◽  
Effective Viscosity ◽  
Shear Stresses ◽  
Visual Evaluation ◽  
Start Up ◽  
Lubricating Layer ◽  
Antiwear Properties ◽  
Boundary Films ◽  
Increasing Temperature

A method for evaluation of the lubricating and rheological properties of hydraulic oils in tribological contacts has been developed, which consists in online studying samples of commercial batches of oils on a software and hardware complex with visual evaluation of the kinetics of changes in the main tribological indicators of friction contact. Using a roller analogy, the operation of gears in the conditions of rolling with 30% sliding is simulated. Samples of AMG-10 oil from two producers are analyzed. It is established that with increasing temperature of lubricant for Sample 2 (“Kvalitet-Avia” AMG-10), a long-term restoration of protective boundary films of oil is observed and the period of their formation increases by 2.5 times, causing the implementation of a semidry mode of lubrication at start-up. The total thickness of the lubricating layer is 1.27 times less as compared with Sample 1 ("Bora B" AMG-10 oil), regardless of the lubricant temperature. Also, the rheological properties of the oils have been determined. Sample 1 exhibits low shear stresses at the level of 9.4 MPa and high effective viscosity, 4249 and 5039 Pa·s, at a volumetric oil temperature of 20 and 100 ºС, respectively. For Sample 2, with increasing oil temperature to 100 ºC shear stress increases by 1.15 times and the effective viscosity in contact decreases by 1.53 times. Additives present in Sample 1 are characterized by more effective antiwear properties and thus increase the wear resistance of contact surfaces in the conditions of rolling with sliding thanks to strengthening of the surface metal layers during operation, while Sample 2 undergoes strengthening-softening processes which reduce the wear resistance of friction pairs

RESEARCH OF MELT PROCESSING IMPACT WITH ELECTROMAGNETIC PULSES UPON SILUMIN WEAR-RESISTANCE

2021 ◽  
Vol 2021 (4) ◽  
pp. 28-35
Author(s):  
Stanislav Dorofeev ◽  
Aleksandr Voynov ◽  
Aleksey Goncharov ◽  
Nadezhda Slavinskaya ◽  
Kirill Doroshenko
Keyword(s):  
Wear Resistance ◽  
Abrasive Wear ◽  
Structure Formation ◽  
Melt Processing ◽  
Slow Cooling ◽  
Electromagnetic Pulses ◽  
Standard Of Comparison ◽  
Electro Magnetic ◽  
The Impact ◽  
Operation Characteristics

To improve functional properties of pre-eutectic silumins there are used many different methods having a complex effect upon processes of structure formation and physical-mechanical properties of alloys. In this paper there is offered a method for alloy operation characteristics increase by the example of wear-resistance by the impact of nanosecond electro-magnetic pulses (NEMP) upon silumin melt AK7ch (AL9). Melt illumination was carried out with the generator (NEMP) (GNI-01-1-6) submersible rod radiator. The melt was overheated to 900ºC and processed with NEMP with the length up to 25 min after that it was cooled at a rate of 20ºC/min. Slow cooling contributed to the formation of a structure close to equilibrium. Cylindrical ingots with a diameter of 0.06 m (60mm) and a height of 0.06 m (60 mm) were obtained. Wear-resistance was defined on a cross cut of ingots according to GOST 23.208-79. As a standard of comparison were used non-irradiated samples of silumin. It is defined that melt NEMP processing changes considerably parameters of crystallization, structure formation and increases silumin properties. At abrasive wear, silumin wear-resistance changes from the duration of melt electro-pulse processing according to an extreme dependence with the evident maximum at melt irradiation in the course of 15 min. At that in the edge area of the ingot wear-resistance increases by 1.54 times, and in the central one – by 1.34 times. This effect is explained by the fact that during melt NEMP processing during 15 min the characteristics of alloy micro-structure change considerably: morphology and dimensions of structural constituents. At that there is formed a qualitatively new fine structure of a non-dendritic type which ensures maximum values of alloy wear-resistance. The data obtained allow developing technology of wear-resistant silumin fusion intended for operation under abrasive wear conditions.

Application of TEM to Deformation, Wear, and Fracture of Ceramics

1974 ◽  
Vol 32 ◽  
pp. 472-473
Author(s):  
B. J. Hockey
Keyword(s):  
Wear Resistance ◽  
High Temperature ◽  
Mechanical Behavior ◽  
Brittle Materials ◽  
High Temperature Strength ◽  
Wide Range ◽  
Corrosive Environments ◽  
Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Analytical electron microscopy of grain boundaries in Al-Cu metallizations

1992 ◽  
Vol 50 (2) ◽  
pp. 1684-1685
Author(s):  
J. R. Michael ◽  
A. D. Romig ◽  
D. R. Frear
Keyword(s):  
Electron Microscopy ◽  
Integrated Circuits ◽  
Failure Mode ◽  
Current Density ◽  
Thermal History ◽  
Analytical Electron Microscopy ◽  
Cu Metallization ◽  
Analytical Electron ◽  
Interconnect Lines

Al with additions of Cu is commonly used as the conductor metallizations for integrated circuits, the Cu being added since it improves resistance to electromigration failure. As linewidths decrease to submicrometer dimensions, the current density carried by the interconnect increases dramatically and the probability of electromigration failure increases. To increase the robustness of the interconnect lines to this failure mode, an understanding of the mechanism by which Cu improves resistance to electromigration is needed. A number of theories have been proposed to account for role of Cu on electromigration behavior and many of the theories are dependent of the elemental Cu distribution in the interconnect line. However, there is an incomplete understanding of the distribution of Cu within the Al interconnect as a function of thermal history. In order to understand the role of Cu in reducing electromigration failures better, it is important to characterize the Cu distribution within the microstructure of the Al-Cu metallization.

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