Development of Al-Cu-Fe Quasicrystal-Poly(p-phenylene sulfide) Composites

2000 ◽  
Vol 643 ◽  
Author(s):  
Paul D. Bloom ◽  
K.G. Baikerikar ◽  
James W. Anderegg ◽  
Valerie V. Sheares
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Chemical Analysis ◽  
Fold Increase ◽  
Reinforced Composites ◽  
Volume Loss ◽  
Third Body ◽  
Wear Properties ◽  
X Ray ◽  
Phenylene Sulfide

AbstractQuasicrystalline Al-Cu-Fe powders were used as a novel filler material in poly(p-phenylene sulfide) (PPS). These polymer/quasicrystal composites showed useful properties that may be beneficially exploited in applications such as dry bearings and composite gears. Al-Cu-Fe quasicrystalline filler significantly improved wear resistance to volume loss in polymer-based composites. In addition to improving the composite wear resistance, the Al-Cu-Fe filler showed low abrasion to the 52100 chrome steel counterface. Furthermore, mechanical testing results showed a two-fold increase in the storage modulus of the reinforced composites compared with the polymer samples. In addition, the Al-Cu-Fe filler was compared to its constituent metals, aluminum oxide, and silicon carbide in PPS. Chemical analysis of the wear interface by X-ray spectroscopy indicated the generation of a third body oxide layer during wear. The fabrication in addition to the thermal, mechanical, and wear properties of these unique materials is described.

Influence of Electron Beam Pulsed Times on the Properties of 40Cr

2010 ◽  
Vol 154-155 ◽  
pp. 1170-1177
Author(s):  
Yuan Fang Chen ◽  
Xiao Dong Peng ◽  
Jian Jun Hu ◽  
Hong Bin Xu ◽  
Chan Hao
Keyword(s):  
Surface Roughness ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
Electron Beam ◽  
High Current ◽  
Wear Properties ◽  
X Ray ◽  
Pulsed Electron Beam ◽  
Surface Microstructures ◽  
40Cr Steel

Surface modification of 40Cr steel by high current pulsed electron beam has been investigated . The pulsed times of HCPEB was changed from 1 to 25 to prepare different specimens. Surface microstructures and section microstructures after HCPEB irradiation were detected by using metallurgical microscope, SEM and X-ray diffractometer. It is shown that crater defects were found on the surface after the irradiation of HCPEB and the density of craters will decrease with increasing pulses times. When treated by 27Kev accelerating voltage, with increasing pulse times, the particles located in surface layer were obviously refined .The surface roughness, hardness, wear properties and corrosion resistance were analyzed after irradiation of HCPEB. The wear resistance and corrosion resistance were obviously enhanced after 10 pulses treatment.

The Influence of HPT on Microstructure and Wear Resistance of Al-7wt%Si-2wt%Fe Alloy

2021 ◽  
Vol 1016 ◽  
pp. 1618-1623
Author(s):  
Jittraporn Wongsa-Ngam ◽  
Jie Xu ◽  
Chakkrist Phongphisutthinan ◽  
Terence G. Langdon
Keyword(s):  
Wear Resistance ◽  
Rotational Speed ◽  
High Pressure Torsion ◽  
Normal Load ◽  
Wear Volume ◽  
Large Strains ◽  
Volume Loss ◽  
Wear Properties ◽  
Cast Material ◽  
Intermetallic Particles

An aluminum silicon-based alloy Al-7wt%Si-2wt%Fe, was processed by severe plastic deformation technique in high-pressure torsion (HPT) at room temperature under a pressure of 6.0 GPa and rotational speed of 1.0 rpm with various numbers of turns up to five. Microstructure evolution, especially iron-containing intermetallic phases, was observed using an optical microscope and a scanning electron microscope (SEM). The microstructure results demonstrate that the large strains introduced by HPT at ambient temperature cause fragmentation of iron-intermetallic particles. The degree of fragmentation increases with increasing numbers of turns so that the intermetallic particles decreased in size with increasing imposed strain. In addition, the wear properties were evaluated using ball-on-disc dry sliding testing for both the as-cast material and the alloy processed by HPT using micro-tribometer UMT-2 (CETR Co., USA) following the ASTM G99-05 (2010) standard. The wear tests were conducted on the surface of the samples at 1.5 mm from the disc center under a normal load of 5 N with a rotational speed of 60 rpm and sliding time of 10 min. The friction coefficient and wear volume loss were examined to evaluate the effect of HPT on wear resistance. The results show that the samples processed by HPT have lower average values for the COF and wear volume loss than that of unprocessed samples.

The Influence of Silicon Carbide Powders on the Enhancement of the Wear Resistance of Epoxy Resin

2019 ◽  
Vol 813 ◽  
pp. 80-85
Author(s):  
Antonio Formisano ◽  
Massimo Durante ◽  
Antonio Langella
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Epoxy Resin ◽  
Abrasive Wear Resistance ◽  
Particle Sizes ◽  
Wear Properties ◽  
Pin On Disc ◽  
Different Content ◽  
Hard Powder ◽  
Counterface Roughness

In order to improve wear properties of thermosetting resins, potential solutions are the reduction of the adhesion between the counterparts and the improvement of their hardness, stiffness and compressive strength. These goals can be achieved with success by using appropriate inorganic fillers. Concerning this, the present work shows the possibility to increase the abrasive wear resistance of an epoxy resin filled with hard powder. The filling is made by silicon carbide powders in different content and with different particle sizes. Abrasive tests, performed by means of a pin on disc apparatus, highlight that the wear of plain and reinforced resins increases both with the contact pressure between the counterparts and the counterface roughness. Moreover, the wear resistance of the filled resins increases with the increase of content and dimensions of the filling particles.

Effect of Varying Wt% of TiC on Mechanical and Wear Properties of RZ5-TiC In-Situ Composite

2018 ◽  
Vol 8 (2) ◽  
pp. 45-56 ◽  
Author(s):  
Deepak Mehra ◽  
M.M. Mahapatra ◽  
S. P. Harsha
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Wear Test ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Tic Particle ◽  
Mechanical And Microstructural Properties ◽  
Sliding Distance

The purpose of this article is to enhance the mechanical properties and wear resistance of the RZ5 alloy used in the aerospace application by adding TiC particles. The present study discusses processing of in-situ RZ5-TiC composite fabricated by self-propagating high temperature (S.H.S.) method and its wear behavior. The effects of TiC particle on mechanical and microstructural properties of the composite are studied. The wear test is performed by varying the sliding distance and applied load. The composite is characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDS). The results exhibited the properties like strength and hardness of RZ5-10wt%TiC composite has been increased considerably, while grain size is decreased as compared to the RZ5 alloy. The fractography indicated mixed mode (quasi-cleavage and ductile feature) failure of the composites. The wear results showed improvement in wear resistance of the composite. The FESEM showed dominate wear mechanisms are abrasion, ploughing grooves.

Microstructural characterization and wear properties of ultra-dispersed nanodiamond (UDD) reinforced Al matrix composites fabricated by ball-milling and sintering

2011 ◽  
Vol 46 (13) ◽  
pp. 1521-1534 ◽  
Author(s):  
H Kaftelen ◽  
ML Öveçoğlu
Keyword(s):  
Wear Resistance ◽  
Ball Milling ◽  
Microstructural Characterization ◽  
Matrix Composites ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Al Matrix Composites ◽  
Al Matrix Composite ◽  
Al Matrix

Elemental aluminum (Al) powders reinforced with 1–10 wt% of ultra-dispersed nanodiamond (UDD) powders were ball-milled in a SpexTM Mixer/Mill between 0 and 120 min followed by consolidation and sintering. X-ray diffraction analyses on the ball-milled powders revealed only α-Al peaks, whereas Al4C3 phase was identified along with α-Al in all sintered composites. Increasing the addition of nanodiamond to Al-matrix resulted in improved hardness of both ball-milled and sintered composites. The wear resistances of the Al-UDD composites were significantly improved with increasing UDD contents. Under similar load and sliding conditions, the wear resistance of Al matrix composite containing 10 wt% nanodiamond enhances about 40 times when compared with unreinforced aluminum.

scholarly journals Wear Resistance Improvement of Copper Alloys Using a Thermochemically Obtained Zinc-Rich Coating

2020 ◽  
Vol 5 (9) ◽  
pp. 1089-1096
Author(s):  
Omar Alvarez ◽  
Carlos Valdés ◽  
Arturo Barba ◽  
Rafael González ◽  
Raúl Valdéz ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Chemical Analysis ◽  
Diffraction Analysis ◽  
Copper Alloys ◽  
Wear Test ◽  
Zinc Powder ◽  
X Ray Diffraction ◽  
Pure Zinc ◽  
X Ray ◽  
Thermochemical Process

It has been developed a thermochemical process that has been applied on copper alloys: brass and bronze, using pure zinc powder, obtaining a zinc-rich wear protective coating. The layers obtained by a diffusion process, on brass (alloy C36000) and bronze specimens (alloy SAE 62), were characterized using a scanning electron microscope, EDAX microanalysis, Vickers microhardness, X-Ray diffraction analysis, and sliding wear test. The chemical analysis showed a layer composition of 62 % Zn and 38 % Cu, on average. The microhardness for thermochemical treated brass was 496HV and 598HV for bronze; thus, a microhardness increase for brass is 468% and 532% for bronze. It was made an X-Ray diffraction analysis, confirming the results obtained with the chemical analysis and crystalline structure for coating. It showed the presence of Cu64Zn36 and Cu5Zn8 phases. The wear tests demonstrated that treated specimens show better wear resistance than non-protected specimens.

Wear Properties and Surface Structure of Ion Implanted Glassy Carbon

1988 ◽  
Vol 100 ◽  
Author(s):  
Kazuo Yoshida ◽  
Kazuhiko Okuno ◽  
Gen Katagiri ◽  
Akira Ishitani ◽  
Katsuo Takahashi ◽  
...  
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Mass Spectroscopy ◽  
Concentration Distribution ◽  
Amorphous Structure ◽  
Wear Properties ◽  
Depth Profiles ◽  
Secondary Ion ◽  
Wear Tests ◽  
Abrasive Paper

ABSTRACTWear properties of Li+, K+, C+, Cl+, and Ti+ implanted glassy carbons (GC) have been studied by wear tests using silicon carbide abrasive paper. It has been found that ion implantation is effective for improving wear resistance of GC. The measurements of Raman spectra revealed formation of an amorphous structure on the surface. Anomalous depth profiles with flat concentration distribution of Li and K atoms were observed by a secondary ion mass spectroscopy (SIMS). In conclusion. the formation of an amorphous structure seems to explain the improvement in wear resistance.

Wear Properties of a Novel Resin Composite Compared to Human Enamel and Other Restorative Materials

2014 ◽  
Vol 39 (6) ◽  
pp. 612-618 ◽  
Author(s):  
C D'Arcangelo ◽  
L Vanini ◽  
GD Rondoni ◽  
M Pirani ◽  
M Vadini ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Resin Composite ◽  
Tetragonal Zirconia ◽  
Control Group ◽  
Wear Depth ◽  
Volume Loss ◽  
Wear Properties ◽  
Mean Values ◽  
Human Enamel

SUMMARY The purpose of this in vitro study was to compare the two-body wear resistance of human enamel, a pressable glass-ceramic (Imagine PressX), a type 3 gold alloy (Aurocast8), three resins composites currently available on the market (Enamel plus HRi, Filtek Supreme XTE, Ceram.X duo), and one recently introduced resin composite (Enamel plus HRi-Function). Resin composites were tested after simple light curing and after a further heat polymerization cycle. Ten cylindrical specimens (7 mm in diameter) were manufactured with each dental material according to standard laboratory procedures. Ten flat enamel specimens were obtained from freshly extracted human molars and included in the control group. All samples were subjected to a two-body wear test in a dual-axis chewing simulator over up to 120,000 loading cycles, against yttria stabilized tetragonal zirconia polycrystal cusps. Wear resistance was analyzed by measuring the vertical substance loss (mm) and the volume loss (mm3). Antagonist wear (mm) was also recorded. Data were statistically analyzed using one-way analysis of variance (ANOVA) (wear depth and volume loss) and Kruskal-Wallis one-way ANOVA on ranks (antagonist wear). Heat-cured HRi function and Aurocast8 showed similar mean values for wear depth and volumetric loss, and their results did not statistically differ in comparison with the human enamel.

Influence of Carbon Content in Cobalt-Based Superalloys on Mechanical and Wear Properties

2004 ◽  
Vol 126 (2) ◽  
pp. 204-212 ◽  
Author(s):  
Rong Liu ◽  
Matthew X. Yao ◽  
Xijia Wu
Keyword(s):  
Mechanical Properties ◽  
Wear Resistance ◽  
Carbon Content ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Scanning Calorimetry ◽  
X Ray ◽  
Pin On Disc ◽  
Rotating Bending ◽  
The Impact

Two cobalt-based superalloys containing 1.6% and 2% carbon respectively were studied, with the emphasis on the influence of the carbon content on their microstructures, wear resistance, and mechanical properties. Phase formation and transformation in the microstructures were analyzed using metallographic, X-ray diffraction, and differential scanning calorimetry techniques. Wear resistance, tensile and fatigue behaviors of the alloys were investigated on a pin-on-disc tribometer, MTS machine and rotating-bending machine, respectively. It is found that the wear resistance was increased significantly with the carbon content. The mechanical properties of the alloys are also influenced by the carbon content, but the impact is not so significant as on the wear resistance. It was observed that the carbon content increased the yielding strength and fatigue strength, but decreased the fracture stress and fracture strain.

Improvement of the Dry Friction and Wear Properties of the Si/SiC by Doping with Ni and PbO

2010 ◽  
Vol 658 ◽  
pp. 456-459
Author(s):  
Ke Zheng Sang ◽  
Wen Chao Wang ◽  
Gang Qiang Geng
Keyword(s):  
Silicon Carbide ◽  
Wear Resistance ◽  
Dry Friction ◽  
Lead Oxide ◽  
Friction And Wear ◽  
Sintering Process ◽  
Wear Properties ◽  
Dry Conditions ◽  
Friction And Wear Properties ◽  
Pin On Disk

The composite of silicon carbide with nickel and lead oxide was prepared by reaction sintered method. The phase compositions of the composites were studied by XRD, SEM and EDX. Friction and wear properties of the composites in dry conditions at the temperatures 15°C, 300°C and 600°C were tested using a pin-on-disk tribometer. The results showed that NiSi2 was formed and located between the SiC particles during sintering process. However the PbO was remained and distributed uniformly in the composites besides a little of Pb4SiO6 were formed. Friction coefficient of the composites decreased with the increase of the temperature and was about 0.2 at 600°C. And wear resistance of the composites was improved at all test temperatures comparing with that of the Si/SiC.

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