Microstructure and Wear Behavior of Thermally Sprayed Fe-Based Amorphous Coating

2007 ◽  
Vol 353-358 ◽  
pp. 848-851 ◽  
Author(s):  
Yeong Sik Kim ◽  
Kyun Tak Kim ◽  
Byung Tak Kim ◽  
Jong Il Bae
Keyword(s):  
Wear Behavior ◽  
Steel Substrate ◽  
Dry Sliding Wear ◽  
Amorphous Coating ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Heat Treated ◽  
Thermally Sprayed ◽  
Amorphous Coatings ◽  
Wear Tests

In this study, microstructure and wear behavior of thermally sprayed Fe-based alloy coatings were investigated. Fe-based alloy coatings were formed on a carbon steel substrate and then heat-treated at temperature of 700 oC for 20 minutes. Dry sliding wear tests were performed using the sliding speeds of 0.4 and 0.8 m/s, the applied loads of 3 and 6 N. Microstructure and wear behavior of as-sprayed and heat-treated Fe-based amorphous coatings were studied using a scanning electron microscope(SEM), transmission electron microscopy(TEM) and X-ray diffraction(XRD).

EFFECTS OF COUNTERPART MATERIALS ON WEAR BEHAVIOR OF THERMALLY SPRAYED Ni-BASED SELF-FLUX ALLOY COATINGS

2010 ◽  
Vol 24 (15n16) ◽  
pp. 3023-3028 ◽  
Author(s):  
KYUN TAK KIM ◽  
YEONG SIK KIM
Keyword(s):  
Sliding Wear ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Dry Sliding Wear ◽  
X Ray ◽  
Heat Treated ◽  
Aisi 52100 ◽  
Thermally Sprayed ◽  
Wear Tests ◽  
Scanning Electron

This study aims at investigating the wear behavior of thermally sprayed Ni -based self-flux alloy coatings against different counterparts. Ni -based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then heat-treated at temperature of 1000 °C. Dry sliding wear tests were performed using the sliding speeds of 0.2 and 0.8 m/s and the applied loads of 5 and 20 N. AISI 52100, Al 2 O 3, Si 3 N 4 and ZrO 2 balls were used as counterpart materials. Wear behavior of Ni -based self-flux alloy coatings against different counterparts were studied using a scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy (EDX). It was revealed that wear behavior of Ni -based self-flux alloy coatings were much influenced by counterpart materials.

Effects of Environment on the Wear Behavior of P/M Ti-47Al-2Cr-0.2Mo

2018 ◽  
Vol 770 ◽  
pp. 106-115
Author(s):  
Jing Wen Qiu ◽  
Di Pan ◽  
Yong Liu ◽  
Ian Baker ◽  
Wei Dong Zhang
Keyword(s):  
Wear Behavior ◽  
High Stress ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
X Ray ◽  
Wear Rates ◽  
Disk Material ◽  
Three Body ◽  
Pin On Disk ◽  
Wear Tests

The wear behavior of powder metallurgical Ti-47Al-2Cr-0.2Mo alloy prepared by pre-alloyed powders was investigated using pin-on-disk wear tests in different environments, viz, argon, 4% hydrogen in nitrogen, air and oxygen. The disk material was sinter-hot isostatically pressed, yttria-stabilized zirconia. Lower wear rates were found for the TiAl pins in oxygen-free environments, indicating that oxygen play a key role in the wear rate. In contrast, the presence of molecular hydrogen and moisture have nearly no effect. A combination of X-ray diffraction and energy dispersive X-ray spectroscopy indicated that the abrasive particles present mainly consisted of the zirconia. In addition, zirconia particles were embedded in the worn tips of the TiAl pins and mixed into the tribolayers. The high stress and high contact temperature at the wear surface made the zirconia disk undergo a phase transformation during the dry sliding wear, accompanied by grain pullout, surface uplifting and microcracking. The hard tribolayer with embedded zirconia particles provides some protection against further wear of the TiAl pin. The highly localized, repetitive shear stress during the wear tests may bring about amorphous TiAl in the wear debris. The main wear mechanisms were abrasive wear of two-body and three-body, some delamination and plastic deformation.

The Effect of Tungsten Addition on the Thermal Stability and Microstructure in the Electroless Ni-P-W Composite Coating

2006 ◽  
Vol 313 ◽  
pp. 83-90 ◽  
Author(s):  
Shih Kang Tien ◽  
Fan Bean Wu ◽  
Jenq Gong Duh
Keyword(s):  
Steel Substrate ◽  
Amorphous Structure ◽  
X Ray Diffraction ◽  
Heating Rates ◽  
Transmission Electron ◽  
Heat Treated ◽  
Differential Scanning Calorimeter Analysis ◽  
Electroless Process ◽  
Electroless Ni ◽  
Heat Treated Temperature

Ni-P-W composite deposit on the mild steel substrate was derived by the electroless process. The composition of the eletroless coating was Ni-10.7wt.%P-8.7wt%W analyzed by electron probe microanalysis (EPMA). The coating was annealed at various temperatures from 350oC to 600oC for 4h and the structure at different heat-treated temperature was studied by X-ray diffraction, and transmission electron microscope (TEM). The crystallization behavior was evaluated by the differential scanning calorimeter analysis with continuously heating from room temperature to 550oC at different heating rates. The hardness at all depths of the coating on the substrate could be acquired by the nanoindentation. From the DSC analysis, the onset temperature and crystallization temperature were 397.7oC and 405.5oC, respectively, at the heating rate of 10oC/min. The activation energy of the Ni-P-W coating was 307 kJ/mol analyzed by Kissinger, and Augis and Bennett methods with different heating rates. The Ni-P-W coating showed an amorphous structure in the as-deposited state and exhibited a relatively low hardness of approximately 6.8 GPa. As temperature was raised to 380oC, the hardness was slightly increased to 8.7 GPa due to the partial precipitation of Ni and Ni3P in the amorphous matrix. On heating to 500oC for 4 h, the hardness reached the maximum value of 12.3 GPa with a grain size of 33.1 nm and followed by gradual degradation above 500oC.

Effect of Sliding Speed and Applied Load on the Wear Behavior of Thermally Sprayed Ni-Based Self-Flux Alloy Coating

2007 ◽  
Vol 353-358 ◽  
pp. 840-843 ◽  
Author(s):  
Yeong Sik Kim ◽  
Kyun Tak Kim
Keyword(s):  
Sliding Wear ◽  
Applied Load ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Alloy Coating ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Sliding Speed ◽  
Ball Diameter ◽  
Thermally Sprayed

This study aims at investigating the effect of the sliding speed and the applied load on the dry sliding wear behavior of thermally sprayed Ni-based self-flux alloy coating. Ni-based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then these coatings were heat-treated at temperature of 1000 oC. Dry sliding wear tests were performed using the sliding speeds of 0.2, 0.4, 0.6 and 0.8 m/s and the applied loads of 5, 10, 15 and 20 N. AISI 52100 ball (diameter 8 mm) was used as counterpart material. Wear behavior of Ni-based self-flux alloy coatings was studied using a scanning electron microscope (SEM) and energy dispersive X-ray spectroscopy (EDX). It was revealed that microstructure and wear behavior of the Ni-based self-flux alloy coatings were much influenced by the sliding speed and the applied load.

Wear Behavior of Al/SiC Composite Coatings According to Sliding Speed and Applied Load

2012 ◽  
Vol 152-154 ◽  
pp. 216-219
Author(s):  
Jae Hong Lee ◽  
Kyun Tak Kim ◽  
Yeong Sik Kim
Keyword(s):  
Thermal Spray ◽  
Wear Behavior ◽  
Thermal Spray Technology ◽  
Composite Coatings ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
X Ray ◽  
Thermal Spray Process ◽  
Spray Process ◽  
Thermally Sprayed

Thermal spray technology allows providing wear-resistant coating on the surface of mechanical components. In this study, wear characteristics of thermally sprayed Al/SiC composite coatings were evaluated. These Al/SiC composite coatings reinforced with SiC particles were fabricated on Al 6061 substrate by thermal spray process. Dry sliding wear tests were performed using the varied sliding speeds and applied loads. Wear behavior of these Al/SiC composite coatings were investigated using scanning electron microscope(SEM), energy dispersive X-ray spectroscopy(EDX) and X-ray diffraction(XRD).

Dry Sliding Wear Behavior and Wear Mechanisms of Thermally Sprayed WCCo-Coatings

2015 ◽  
Vol 788 ◽  
pp. 143-150
Author(s):  
Alexandra Gontarenko ◽  
Kai Möhwald ◽  
Todd Alexander Deißer ◽  
Hans Jurgen Maier
Keyword(s):  
Wear Resistance ◽  
Sliding Wear ◽  
Sliding Friction ◽  
Wear Behavior ◽  
Steel Substrate ◽  
Thermal Spraying ◽  
High Wear Resistance ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Thermally Sprayed

Thermal spraying is one of the most efficient methods to deposit hard wear resistant coatings. The coatings deposited by High-Velocity-Oxygen-Fuel spraying (HVOF) are characterized by high wear resistance and outstanding tribological characteristics. One of the most challenging tasks for tribologists is to develop surface treatments that allow for both operating the component without lubricants and at the same time minimize wear. WC-based cermets are a group of thermally sprayed coatings known to have high wear resistance under sliding friction conditions. An experimental study on the dry sliding wear behavior of WCCo HVOF-sprayed coating deposited onto a steel substrate is presented in the current paper. A pin-on-disc tribometer was used to carry out the wear tests.

Wear Mechanism of ADI

2012 ◽  
Vol 445 ◽  
pp. 673-678
Author(s):  
Bijan Abbasi Khazaei
Keyword(s):  
Carbon Content ◽  
Wear Mechanism ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Wear Behavior ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Wear Tests

In this research wear mechanism of ADI under different intensity of loading with different hardness have been investigated. To study of wear behavior, a series of austempered specimens with optimum mechanical properties were used for wear tests. Dry sliding wear tests were carried out in pin-on-ring wear tester machine at speed of 0.5 ms-1 and loaded with normal loads of 100,200,300 and 400 N. Scanning electron microscopy for microstructure and wear surface analysis was used. To determine the austenite volume fraction and the percentage of carbon content in austenite, X-ray diffraction analysis was used. Results show that the role of retained austenite at wear properties of ADI is dependent on loading intensity and austenite carbon content.

Microstructure and Dry Sliding Wear Behavior of Laser Cladding (TiC+TiN)-NiCrWC Powder Composite Coating on DZ125 Superalloy

2012 ◽  
Vol 557-559 ◽  
pp. 1699-1703 ◽  
Author(s):  
Jun Zhou ◽  
Fa Qin Xie ◽  
Jing Fang Jia ◽  
Nai Ming Lin ◽  
Xiang Qing Wu
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Laser Cladding ◽  
Wear Behavior ◽  
Optical Microscope ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
Metallurgical Bonding ◽  
The Matrix ◽  
Wear Tests

Ni-based TiN-TiC composite coating was fabricated on DZ125 superalloy surface by laser cladding. The phase constitution and microstructures were investigated by means of X-ray diffraction (XRD), optical microscope (OM) and scanning electron microscope (SEM). Microhardness measurements and wear experiments without lubrication were also accomplished. The experimental results showed that a pore- and crack-free coating with metallurgical bonding to the substrate was obtained. Solidification morphologies along the section of the coating varied from directional dendrite in the interface to random dendrite in the surface. The coating was mainly composed of γ-Ni, M23C6, TiN, TiC particles and a small amount of NiTi, respectively. The average microhardness of 705HK for the coating was 2.3 times higher than that of the substrate. Wear tests indicated that wear resistance of the coating was significantly improved compared with that of the substrate. The improvement in hardness and wear resistance was attributed to TiN and TiC phase and chromium carbide uniformly dispersed in the matrix of the Ni-based TiN-TiC composite coating.

Influence of reinforcing fiber on the dry sliding wear behavior of hybrid fabric/benzoxazine composites

2019 ◽  
Vol 89 (23-24) ◽  
pp. 5153-5164
Author(s):  
Meng Su ◽  
Lei Liang ◽  
Fang Ren ◽  
Weigang Yao ◽  
Mingming Yu ◽  
...  
Keyword(s):  
High Temperatures ◽  
Tribological Properties ◽  
Sliding Wear ◽  
Wear Behavior ◽  
Wear Test ◽  
Mechanical Analysis ◽  
Dry Sliding Wear ◽  
Fabric Composite ◽  
Fabric Composites ◽  
Wear Tests

Hybrid polyimide (PI)-polytetrafluoroethylene (PTFE)/Nomex fabric composites and Nomex-PTFE/Nomex fabric composites were prepared with benzoxazine (BOZ) as the resin binder. The tribological properties and wear mechanisms of the two composites at different temperatures were investigated using a ball-on-disk wear tester. Before sliding wear tests, a thermo-aging test, thermogravimetric analysis and dynamic mechanical analysis of PI and Nomex fibers were performed to evaluate the thermal properties of the two reinforcing fibers. After each wear test, scanning electron microscopy was employed to analyze the morphologies of the worn surfaces of the composite. The results of sliding wear tests show that the difference between the tribological properties of the two composites is small at room temperature. However, the hybrid PI-PTFE/Nomex fabric composite achieves better tribological properties at high temperatures compared with the hybrid Nomex-PTFE/Nomex fabric composite, which suffered wear failure at 240℃. It is proposed that the excellent thermal mechanical property and thermal stability of PI fibers is the main factor that endows the PI-PTFE/Nomex/BOZ composite with a more favorable tribological property at high temperatures. Moreover, the influence of the increasing temperature on the tribological properties of the two composites was also investigated.

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