Sliding Wear Properties of HVOF Sprayed WC-10Co4Cr Coatings With Conventional Structure and Bimodal Structure Under Different Loads

2021 ◽  
Vol 144 (1) ◽  
Author(s):  
Yong-Kuan Zhou ◽  
Jia-Jie Kang ◽  
Wen Yue ◽  
Xiao-Bin Liu ◽  
Zhi-Qiang Fu ◽  
...  
Keyword(s):  
Sliding Wear ◽  
Friction And Wear ◽  
X Ray Diffraction ◽  
Indentation Fracture ◽  
Wear Properties ◽  
Bimodal Structure ◽  
Indentation Fracture Toughness ◽  
Lower Porosity ◽  
Conventional Structure ◽  
Oxygen Fuel

Abstract The WC-10Co4Cr coatings with conventional structure and bimodal structure were sprayed by high-velocity oxygen fuel (HVOF) technology. The phase compositions and morphologies of the WC-10Co4Cr powders and coatings were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The microhardness, porosity, bonding strength, elastic modulus, and indentation fracture toughness of the conventional coating (Conventional) and the bimodal coating (Bimodal) were also studied. The sliding wear properties of the Conventional and the Bimodal against Si3N4 counterballs under different loads at room temperature (∼25 °C) were investigated using a friction and wear tester. Compared with the Conventional, the Bimodal has denser microstructure, lower porosity, more excellent mechanical properties, and the Bimodal has better wear resistance than the Conventional under different loads. The two coatings under 15 N and 30 N only exhibit abrasive and slightly adhesive wear mechanism, while in the load application of 45 N, additional mechanism which is fatigue is detected and causes flaking of the coating.

scholarly journals Synthesis, Characterization, and Tribological Behavior of Oleic Acid Capped Graphene Oxide

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Tiedan Chen ◽  
Yanqiu Xia ◽  
Zhengfeng Jia ◽  
Zhilu Liu ◽  
Haobo Zhang
Keyword(s):  
Graphene Oxide ◽  
Oleic Acid ◽  
Friction And Wear ◽  
Graphite Powder ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Transmission Electron ◽  
Alpha Olefin ◽  
Ir Transmission ◽  
Ft Ir

Graphene oxide (GO) nanosheets were prepared by modified Hummers and Offeman methods. Furthermore, oleic acid (OA) capped graphene oxide (OACGO) nanosheets were prepared and characterized by means of Fourier transform-infrared spectroscopy (FT-IR), transmission electron microscopy (TEM), and X-ray diffraction (XRD). At the same time, the friction and wear properties of OA capped graphite powder (OACG), OACGO, and oleic acid capped precipitate of graphite (OACPG) as additives in poly-alpha-olefin (PAO) were compared using four-ball tester and SRV-1 reciprocating ball-on-disc friction and wear tester. By the addition of OACGO to PAO, the antiwear ability was improved and the friction coefficient was decreased. Also, the tribological mechanism of the GO was investigated.

Comparison of Structure and Wear Properties of Fine-Structured WC-CoCr Coatings Deposited by HVOF and HVAF Spraying Processes

2012 ◽  
Vol 188 ◽  
pp. 422-427 ◽  
Author(s):  
Iosif Hulka ◽  
Viorel Aurel Şerban ◽  
Kari Niemi ◽  
Petri Vuoristo ◽  
Johannes Wolf
Keyword(s):  
High Velocity ◽  
Wear Behaviour ◽  
Tungsten Carbides ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Fuel Gas ◽  
Cermet Powder ◽  
Pin On Disk ◽  
Oxygen Fuel ◽  
Disk Test

The aim of the work was to study the microstructure and wear properties of fine-structured HVOF and HVAF sprayed WC-10Co-4Cr coatings prepared from powder having submicron-sized tungsten carbides. The coatings were deposited by HVOF (High Velocity Oxygen Fuel) and HVAF (High Velocity Air Fuel) using propane as a fuel gas in both processes, and using oxygen or air as oxidizing gas for combustion, respectively. Nitrogen was used as carrier gas for the powder. Commercially available agglomerated and sintered cermet powder with main carbide sizes under 500 nm was used in this study. Scanning electron microscopy (SEM) and X-ray diffraction were performed in order to characterize the powder and the microstructures formed during the spraying processes. The microhardness HV0.3 of the coatings was investigated and the pin on disk test was used to determine the sliding wear behaviour. The rubber wheel abrasion test was performed in order to determine the abrasion wear resistance of the coatings.

Research on Friction and Wear Properties of Ti(C,N)/Fe Composites

2013 ◽  
Vol 650 ◽  
pp. 326-332
Author(s):  
Yang Li ◽  
Zhi Ping Sun ◽  
Rui Feng Wang ◽  
Li Yan Zou
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Friction And Wear ◽  
Adhesive Wear ◽  
Sintering Process ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Friction And Wear Properties ◽  
Scanning Electron

The effect of different load, revolving speed ,content of Ti(C,N) and sintering process on the friction coefficient and wear rate of Ti(C,N)/Fe composites was investigated systemically. Besides, the wear morphology of Ti(C,N)/Fe composites were researched with an environment scanning electron microscopy(SEM),and the phase composition were studied by X-ray diffraction(XRD).The research shows that the wear mechanism of Ti(C,N)/Fe composites are abrasive wear and adhesive wear.

Experimental Research on the Friction and Wear Properties of Ni-Based Composite Coating Prepared by Laser Cladding

2013 ◽  
Vol 747-748 ◽  
pp. 152-157 ◽  
Author(s):  
Shu Fa Chen ◽  
Cheng Long Feng ◽  
Jin Yang ◽  
Jin Song Chen
Keyword(s):  
Sliding Wear ◽  
Friction And Wear ◽  
Wear Behavior ◽  
Frictional Coefficient ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Low Load ◽  
Moderate Load ◽  
Friction And Wear Properties ◽  
Worn Surface

In this study, the dry sliding wear behavior of Ni-based self-lubricating wear-resistant coating was characterized under various loads at 300 . Morphologies and compositions of the worn surface were analyzed by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). The experimental results showed that with the increase of load, both the frictional coefficient and wear rate decreased firstly, then slightly increased. A small amount of debris dispersed on the worn surface of the coating under low load (2 N). Since the effects of oxide layer and lubricant particles spreading onto the worn surface, the coating exhibited superior friction, and improved the wear properties under moderate load (5 N). As the load further increased, till up to 10N, the worn surface started to appear some shallow grooves and craters. This was contributed to the dispersion of carbides and lubricant particles.

Effect of Loads on the Wear Properties of La2O3-MoSi2 Composite against SiC at Elevated Temperature

2011 ◽  
Vol 415-417 ◽  
pp. 2138-2141
Author(s):  
Si Yong Gu ◽  
Hou An Zhang ◽  
Chun Shi
Keyword(s):  
High Temperature ◽  
Elevated Temperature ◽  
Friction Coefficient ◽  
Wear Rate ◽  
Wear Mechanisms ◽  
Friction And Wear ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Sliding Speed ◽  
X Ray

Wear behaviours of La2O3-MoSi2composite against SiC under different loads at 1000°C and 0.126m/s sliding speed in air were investigated by using an XP-5 type high temperature friction and wear tester. The worn surfaces and phase of the sample were observed by scanning election microscopy (SEM) and X-ray diffraction (XRD), respectively. Results showed that friction coefficient and wear rate of La2O3-MoSi2composite and SiC decreased with the increase of loads. The wear mechanisms of La2O3-MoSi2composite are oxidation, adhesion abrasion and fatigue pitting.

Microstructure and Wear Properties of Fe-Cr-C and Fe-Cr-Si-C Clads on Carbon Steel by TIG Surfacing Process

2009 ◽  
Vol 83-86 ◽  
pp. 1035-1042
Author(s):  
Ghasem Azimi ◽  
Morteza Shamanian
Keyword(s):  
Heat Source ◽  
Sliding Wear ◽  
Volume Fraction ◽  
Dry Sliding Wear ◽  
Surface Alloying ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Alloyed Surface ◽  
St52 Steel ◽  
Wear Tests

In the present study, the surface of St52 steel was alloyed with preplaced powders Fe-Cr-C and Fe-Cr-Si-C by using a tungsten-inert gas (TIG) heat source. Then microstructure of the alloyed surfaces was investigated. Following the surface alloying, conventional characterization techniques, such as optical microscopy, scanning electron microscopy (SEM) and X-ray diffraction were employed to study the microstructure of the alloyed surface. Microhardness measurements were performed across the alloyed zone. The tribological behavior of the coatings was compared in room temperature dry sliding wear tests. It was found that the as-deposited coatings consisted of higher volume fraction of carbides (Cr7C3). No crack formation was found on the coatings. As a result, TIG arc heat source can be used effectively for performing surface alloying on St52 steel with a preplaced powder in order to improve its surface wear resistance.

scholarly journals Analysis of Sliding Wear Properties of Oxide Ceramics by an Indentation Fracture Model

1988 ◽  
Vol 96 (1111) ◽  
pp. 259-264
Author(s):  
Manabu TAKATSU ◽  
Hidehiro KAMIYA ◽  
Takashi OOSHIMA ◽  
Jun-ichi TAKAHASHI
Keyword(s):  
Sliding Wear ◽  
Fracture Model ◽  
Oxide Ceramics ◽  
Indentation Fracture ◽  
Wear Properties

Does Thermal Conductivity Play a Role in Sliding Wear of Metals in Cryogenic Environment?

2010 ◽  
Vol 132 (4) ◽  
Author(s):  
Bikramjit Basu ◽  
Amartya Mukhopadhyay ◽  
Ankit Mishra ◽  
J. Sarkar
Keyword(s):  
Thermal Conductivity ◽  
Wear Rate ◽  
Sliding Wear ◽  
Friction And Wear ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
Oxidative Wear ◽  
Wear Properties ◽  
Wear Rates ◽  
Test Conditions

The thermal conductivity of a metallic test piece is one of the principal parameters that influence the temperature buildup at tribocontacts and this normally plays an important role in the unlubricated dry sliding wear of metallic materials. It is, however, not clear whether thermal conductivity is an equally important parameter in the case of wear of metals at cryogenic temperatures, in particular, at liquid nitrogen temperature (LN2) of −196°C. In order to assess the influence of such a physical property of selected nonferrous metals on their tribological behavior in the LN2 environment, we have studied the friction and wear properties of high purity copper (Cu) and titanium (Ti) against the bearing grade steel. These two materials have been processed to produce samples of comparable hardness that have widely different thermal conductivities at room temperature and at test temperature. Wear tests were conducted at three different sliding speeds (0.89 m/s, 1.11 m/s, and 1.34 m/s) under 10 N load, and the friction and wear data were compared. Ti exhibited an order of magnitude higher wear rate (∼10−3 mm3/N m) as compared with Cu in identical test conditions. While evidences of abrasive wear and adhesive wear, without any oxidative wear, were found in worn Cu surfaces, worn Ti surfaces showed evidences of significant oxidative wear and mechanical damage of tribolayers. Higher wear rate in Ti appeared to be a result of oxidative wear of Ti, which seemed to be driven by the depletion of LN2 blanket at the tribocontacts under the influence of high flash temperature (14–76°C) as compared with the boiling temperature of LN2(−196°C). These results demonstrate that the materials with similar hardness subjected to identical LN2 wear test conditions can have significantly different wear rates because of the difference in the flash temperatures, which depend on the thermal conductivity of the test pieces.

Study on Microstructure and Wear Properties of (Ti,W)C/Fe Surface Composite Coating

2012 ◽  
Vol 472-475 ◽  
pp. 2779-2782 ◽  
Author(s):  
Jing Wang ◽  
Si Jing Fu ◽  
Bing Hua Jiang ◽  
Yi San Wang
Keyword(s):  
Sliding Wear ◽  
Composite Coatings ◽  
Wear Test ◽  
Dry Sliding Wear ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
X Ray ◽  
Surface Composite ◽  
Rectangular Form

(Ti,W)C particles reinforced Fe-based surface composite coatings were fabricated by in-situ synthesis and powder metallurgy route. The microstructure, interface and wear properties were investigated by X-ray diffraction, scanning electron microscopy and dry sliding wear test. The results show that (Ti,W)C carbides form via in situ reaction between titanium, ferrotungsten and graphite. The morphology of (Ti,W)C is mainly rectangular form. The interface between (Ti,W)C and iron matrix is found to be free from cracks and deleterious phases. The coating reinforced by (Ti,W)C particles possesses higher wear resistance than that of the substrate.

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