Wear behavior and morphologic characterization of diamond segments induced by crystal plane characteristics of diamond grits in sawing hard materials

2022 ◽  
pp. 105783
Author(s):  
Depeng Sun ◽  
Heng Zhang ◽  
Yu Cai ◽  
Tongyan Sun ◽  
Jinsheng Zhang
Keyword(s):  
Wear Behavior ◽  
Crystal Plane ◽  
Hard Materials

Wear Behavior and Structural Characterization of a Nitrogen Implanted Ti6Al4V Alloy at Different Temperatures

1983 ◽  
Vol 27 ◽  
Author(s):  
R. Martinella ◽  
G. Chevallard ◽  
C. Tosello
Keyword(s):  
Wear Resistance ◽  
Structural Characterization ◽  
Wear Behavior ◽  
Hardened Layer ◽  
Structural Modifications ◽  
Theory Comparison ◽  
Different Temperatures ◽  
Nitrogen Ions ◽  
Wear Tests

ABSTRACTMechanically polished Ti6Al4V samples were implanted with 100 key nitrogen ions to a fluence of 5.1017 ions/cm2 at two different bulk tenneratures: 370°C and 470°C. Wear tests were carried out with a reciprocating slidina tribotester. Structural modifications and wear morphologies were studied by TEM and SEM. 370°C implanted sample showed the same wear behavior as unimplanted ones, while 470°C implanted sample showed better wear resistance because of a TiN hardened layer. Correlations- between microstructural modifications, wear behavior and mechanisms are reported: results agree with the delamination theory. Comparison with ion- and gas-nitrided samples are presented.

High-temperature synthesis and characterization of boron suboxide (B6O) and boron containing hard materials

2019 ◽  
Vol 16 ◽  
pp. 95-101
Author(s):  
Jelena Maletaškić ◽  
Jelena Luković ◽  
Katsumi Yoshida ◽  
Toyohiko Yano ◽  
Ryosuke S.S. Maki ◽  
...  
Keyword(s):  
High Temperature ◽  
Synthesis And Characterization ◽  
Temperature Synthesis ◽  
Hard Materials ◽  
High Temperature Synthesis ◽  
Boron Suboxide

Thermal Spraying Applied Onto High Energy Railway Braking: Characterization of Friction Performances

1998 ◽  
Author(s):  
H. Bartys ◽  
J.D. Guerin ◽  
J.P. Bricout ◽  
J. Oudin
Keyword(s):  
High Speed ◽  
Wear Behavior ◽  
Energy Levels ◽  
Thermal Spraying ◽  
High Energy ◽  
Coated Steel ◽  
High Speed Trains ◽  
To Come ◽  
Tribological Characterization

Abstract Optimization of constitutive friction materials of braking devices for high speed trains is endlessly on delicate increase by reason of the large energy levels to dissipate, and the lightening more and more required by generations to come. Low thermal diffusivity materials such as coated steel discs in one of the research themes in this field. Proposed study is relative to tribological characterization of the wear behavior of stellite coatings, based on cobalt or nickel alloys against aluminum titanate pad. This one has ever been tested and prooved good behavior against cermet coated steel discs. Stellite coating performances are evaluated in term of friction coefficient, contact temperature and wear in comparison with this type of disc.

Formation and Characterization of the Quasicrystal Films

2007 ◽  
Vol 546-549 ◽  
pp. 1699-1702
Author(s):  
Xi Ying Zhou ◽  
Liang He ◽  
Yan Hui Liu
Keyword(s):  
Electron Microscopy ◽  
Thin Films ◽  
Scanning Electron Microscopy ◽  
Electric Current ◽  
Wear Behavior ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
X Ray ◽  
Scanning Electron

Al-Cu-Fe quasicrystals powder was used to prepare the thin films on the surface of the A3 steel by the means of DMD-450 vacuum evaporation equipment. The thin films with different characterization were obtained through different parameters. The microstructures of the thin films were analyzed by Scanning Electron Microscopy (SEM) and X-ray Diffraction (XRD). Additionally, the nano-hardness and the modulus of the films are tested by MTS and Neophot micro-hardness meter. The results showed that the modulus of the films was about 160GPa. Nano hardness of the films was about 7.5 Gpa. The films consisted of CuAl2, AlCu3. The thickness and the micro-hardness of the films are improved. In same way, with the increase of the electric current, the thickness and the hardness of the films are also improved. Along with increase of the time and the electric current, the wear behavior of the films was improved. To some extent, the microstructure of films contained the quasicrystal phase of Al65Cu20Fe15.

scholarly journals Additively Manufactured Al/SiC Cylindrical Structures by Laser Metal Deposition

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3331 ◽  
Author(s):  
Ainhoa Riquelme ◽  
Pilar Rodrigo ◽  
María Dolores Escalera-Rodríguez ◽  
Joaquín Rams
Keyword(s):  
Wear Resistance ◽  
Powder Metallurgy ◽  
Wear Behavior ◽  
Metal Deposition ◽  
Fabrication Process ◽  
Laser Metal Deposition ◽  
Composite Matrix ◽  
Cylindrical Structures ◽  
Preliminary Characterization

Preliminary characterization of the microstructure of Al/SiCp composites prepared by Laser Metal Deposition (LMD) was analyzed, and the microhardness and wear behavior of the materials manufactured have been evaluated. It has been determined that the combined effect of the laser speed and power is decisive for the fabrication process. The microstructure characterization shows that the presence of hygroscopic Al4C3 can be avoided by adding Ti to the composite matrix. The wear behavior of the LMD samples and their microhardness have been compared with Powder Metallurgy samples with the same composition. The LMD samples showed higher hardness and wear resistance.

scholarly journals Production and Tribological Characterization of Tailored Laser-Induced Surface 3D Microtextures

Lubricants ◽  
2019 ◽  
Vol 7 (8) ◽  
pp. 67 ◽  
Author(s):  
Joel Voyer ◽  
Johann Zehetner ◽  
Stefan Klien ◽  
Florian Ausserer ◽  
Igor Velkavrh
Keyword(s):  
Friction And Wear ◽  
Wear Behavior ◽  
Pulsed Laser ◽  
Antifriction Coating ◽  
The Coefficient Of Friction ◽  
Tribological Characterization ◽  
Steel Substrates ◽  
Different Levels ◽  
Lubrication Conditions

The aim of the present study was firstly to determine the manufacturing feasibility of a specific surface 3D-microtexturing on steel through an ultra-short pulsed laser, and secondly to investigate the tribological properties under 2 different lubrication conditions: oil-lubricated and antifriction coated. The selected 3D-microtexture consisted of 2 different levels of quadratic micropillars having side dimensions of approximately 45 µm, heights of about 35 µm and periods of 80 µm. It was shown that the production of specific 3D-microtextures on steel substrates using an ultra-short pulsed laser was feasible, and that the reproducibility of the texture dimensions over the entire textured region was extremely good. Frictional investigations have shown that, in comparison to the benchmark (untextured samples), the 3D-microtextured samples do not induce any significant improvements in the coefficient of friction (COF) under oil-lubricated conditions, but that under antifriction coated conditions, significant improvements in the friction coefficients may be achieved. Wear-based tribological tests have shown that the antifriction coating on benchmark samples was completely depleted, which greatly influenced their friction and wear behavior, since steel-steel contact occurred during testing. For the 3D-microtexture, the antifriction coating was also partially depleted; however, it accumulated itself in the microtexture which acted as a potential lubricant reservoir.

Production and Characterization of Aluminium Metal Matrix Composite Reinforced with Al3Ni by Stir and Squeeze Casting

2015 ◽  
Vol 766-767 ◽  
pp. 315-319
Author(s):  
R. Ramesh ◽  
S. Suresh Kumar ◽  
S. Gowrishankar
Keyword(s):  
Squeeze Casting ◽  
Wear Behavior ◽  
Optical Microscope ◽  
Dry Sliding Wear ◽  
Mechanical And Tribological Properties ◽  
Intermediate Phases ◽  
Ni Powder ◽  
Xrd Patterns

In the present work AA1100/ Al3Ni MMC was successfully fabricated using the in-situ method of stirring and squeeze casting. The effects of amount of Ni powder on the formation and mechanical behavior of Al-Al3Ni MMC were investigated. The fabricated MMC was characterized using XRD and optical microscope. The XRD patterns clearly indicated the presence of Al3Ni particles without the formation of intermediate phases. The in-situ formed Al3Ni particles were found to have uniform distribution, good bonding and clear interface. The mechanical and tribological properties such as hardness, Ultimate Tensile Strength (UTS) and dry sliding wear behavior of AA1100/ Al3Ni MMC were compared for stir and squeeze casted MMCs with different percentage in weight of Al3Ni (5, 10 wt. %) and it was found that properties improved with increase in Al3Ni content and all properties of squeeze casted MMCs were superior to stir casted MMCs.

Experimental Characterization of Variable Bristle Diameter Brush Seal Leakage, Stiffness and Wear

2013 ◽  
Author(s):  
Deepak Trivedi ◽  
Binayak Roy ◽  
Mehmet Demiroglu ◽  
Xiaoqing Zheng
Keyword(s):  
Wear Behavior ◽  
Pressure Loading ◽  
Blow Down ◽  
Friction Forces ◽  
Brush Seal ◽  
Wide Range ◽  
Successful Design ◽  
Brush Seals ◽  
And Performance

Brush seals are used in a wide variety of turbomachinery for sealing rotor-stator and stator-stator clearances. Application of traditional brush seals is limited by their life and performance at high differential pressures. GE’s patent-pending Variable Bristle Diameter (VBD) brush seal overcomes the limitations of the traditional brush seal by sandwiching a layer of fine bristles, with better sealing capability, between adjacent rows of stiffer bristles capable of withstanding larger differential pressure and flow disturbance. The General Electric VBD design uses thick bristles both in front and back rows. In addition to leakage performance, for successful design it is important to understand the force interactions between a brush seal bristle pack and the rotor. The important failure mechanisms to avoid include overheating and rotor dynamic instabilities caused by excessive brush seal forces. Brush seal stiffness, defined as brush seal force per unit circumferential length per unit incursion of the rotor, depends on the complex interaction of the pressure-dependent inter-bristle forces, the blow-down forces and the friction forces between the backplate and the bristle pack. Furthermore, brush seals exhibit different hysteresis and wear behavior under different pressure loading conditions. In this article, we present experimentally measured leakage, stiffness and wear characteristics of three different VBD brush seal designs subjected to a wide range of pressure loading.

Sign in / Sign up

Export Citation Format

Share Document