Effects of La2O3 on Microstructure and Wear Properties of Thermal Clad NiCoW/ La2O3 Composite Coatings

2014 ◽  
Vol 852 ◽  
pp. 153-156
Author(s):  
Bu Nv Liang ◽  
Zhen Yu Zhang
Keyword(s):  
Sliding Wear ◽  
Vickers Microhardness ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Flame Spray ◽  
Wear Properties ◽  
Dry Conditions ◽  
Weight Loss Method ◽  
Loss Method ◽  
Wear Tests

NiCoW alloy powders with and without 0. 4 % La2O3were flame spray welded onto 1045 carbon steel substrate. Vickers microhardness profiles of the coatings were carried out. Sliding wear tests in dry conditions were carried out by means of weight-loss method for several applications in oil industries. For this purpose, Ni-based alloy and high chrome cast iron were used as compared materials. A scanning electron microscope (SEM) was used to analyze the wear phenomena of samples. The result showed that the hardness of the coatings can be improved by addition of 0. 4 % La2O3, and the anti-adhesion, anti-scratching, and plastic deformation resistance abilities of coatings are increased with the addition of La2O3.

Wear Behaviour of Thermal Spray Welded FeNi and CeO2 Composite Coatings

2011 ◽  
Vol 194-196 ◽  
pp. 363-366
Author(s):  
Bu Nv Liang ◽  
Biao Chen ◽  
Zhen Yu Zhang ◽  
Peng Lin Zhang
Keyword(s):  
Sliding Wear ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Wear Behaviour ◽  
Flame Spray ◽  
Dry Conditions ◽  
Weight Loss Method ◽  
Loss Method ◽  
Wear Tests ◽  
Feni Alloy

FeNi alloy powders with and without 0.4 % CeO2were flame spray welded onto 1045 carbon steel substrate. Vickers microhardness profiles of the coatings were carried out. Sliding wear tests in dry conditions were carried out by means of weight-loss method for several applications in oil industries. For this purpose, Ni-based alloy and high chrome cast iron were used as compared materials. A scanning electron microscope(SEM) was used to analyze the wear phenomena of samples. The result showed that the hardness of the coatings can be improved by addition of 0. 4 % CeO2, and the anti-adhesion, anti-scratching, and plastic deformation resistance abilities of coatings are increased with the addition of CeO2.

Microstructure and Wear Properties of Self-Lubricating H-BN/Ni Coating by Laser Cladding

2010 ◽  
Vol 154-155 ◽  
pp. 617-620
Author(s):  
Wei Niu ◽  
Rong Lu Sun ◽  
Yi Wen Lei
Keyword(s):  
Laser Cladding ◽  
Sliding Wear ◽  
Steel Substrate ◽  
Wear Test ◽  
Medium Carbon Steel ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Medium Carbon ◽  
Test Conditions ◽  
Wear Tests

Self-lubricating h-BN/Ni coating was prepared on a medium carbon steel substrate by CO2 laser cladding using a powder mixture of NiCrBSi+5%h-BN(wt.%). Microstructures and phase structure of the coating were analyzed using SEM, EDS and XRD. Wear tests were carried out using a M100 pin-on-ring wear tester. The results show that h-BN/Ni coating has much superior war resistance and noticeably lower fiction coefficient under dry sliding wear test conditions.

Tribological Properties of Ti-Al Alloy Self-Lubricating Composite Materials

2013 ◽  
Vol 842 ◽  
pp. 114-117
Author(s):  
Xiu Ling Wang ◽  
Li Ying Yang ◽  
Shou Ren Wang ◽  
Yi Zhang
Keyword(s):  
Sliding Wear ◽  
Solid Lubricant ◽  
Al Alloy ◽  
Test Results ◽  
Weight Percentage ◽  
Dry Conditions ◽  
Hot Pressing Sintering ◽  
Worn Surface ◽  
Wear Tests ◽  
Self Lubricating Composites

A series of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 (CB) self-lubricating composites with addition of different weight percentage of solid lubricant were prepared by vacuum hot pressing sintering. Sliding wear tests against 45#steel were performed on the specimen in dry conditions, worn morphology was observed by the scanning electron microscope (SEM). The test results show that when addition of solid lubricant weight percentage is 10%, the worn surface of the composites is most smooth.The main wear mechanisms of Ti-48Al-2Cr-2Nb/62%BaF2-38%CaF2 composite are abrasive wear and adherent wear.

Improved wear properties of high energy ion-implanted polycarbonate

1995 ◽  
Vol 10 (1) ◽  
pp. 190-201 ◽  
Author(s):  
G.R. Rao ◽  
E.H. Lee ◽  
R. Bhattacharya ◽  
A.W. McCormick
Keyword(s):  
Energy Transfer ◽  
Lower Energy ◽  
Sliding Wear ◽  
Ion Irradiation ◽  
Surface Hardness ◽  
High Energy ◽  
Cross Linking ◽  
Wear Properties ◽  
Hardness Values ◽  
Wear Tests

Polycarbonate (LexanTM) (PC) was implanted with 2 MeV B+ and O+ ions separately to fluences of 5 × 1017, 1 × 1018, and 5 × 1018 ions/m2, and characterized for changes in surface hardness and tribological properties. Results of tests showed that hardness values of all implanted specimens increased over those of the unirradiated material, and the O+ implantation was more effective in improving hardness for a given fluence than the B+ implantation. Reciprocating sliding wear tests using a nylon ball counterface yielded significant improvements for all implanted specimens except for the 5 × 1017 ions/m2 B+-implanted PC. Wear tests conducted with a 52100 steel ball yielded significant improvements for the highest fluence of 5 × 1018 ions/m2 for both ions, but not for the two lower fluences. The improvements in properties were related to Linear Energy Transfer (LET) mechanisms, where it was shown that the O+ implantation caused greater ionization, thereby greater cross-linking at the surface corresponding to much better improvements in properties. The results were also compared with a previous study on PC using 200 keV B+ ions. The present study indicates that high energy ion irradiation produces thicker, more cross-linked, harder, and more wear-resistant surfaces on polymers and thereby improves properties to a greater extent and more efficiently than lower energy ion implantation.

scholarly journals NiTi Intermetallic Surface Coatings by Laser Metal Deposition for Improving Wear Properties of Ti-6Al-4V Substrates

2014 ◽  
Vol 2014 ◽  
pp. 1-8 ◽  
Author(s):  
Mokgadi Nomsa Mokgalaka ◽  
Sisa Lesley Pityana ◽  
Patricia Abimbola Idowu Popoola ◽  
Tebogo Mathebula
Keyword(s):  
Sliding Wear ◽  
Surface Coatings ◽  
Dry Sliding Wear ◽  
Dry Sliding ◽  
Wear Properties ◽  
Wear Analysis ◽  
Intermetallic Coatings ◽  
Oxidation And Corrosion ◽  
Ti Content ◽  
Wear Tests

The NiTi intermetallic possesses a number of good properties, such as high wear, oxidation, and corrosion resistance. This paper focuses on the deposition of NiTi intermetallic coatings on Ti6Al4V substrate by laser melting of Ti and Ni elemental powder mixtures. The effect of varying the Ti content in the NiTi composition on the microstructure and wear properties of the coatings was investigated. The microstructure of the NiTi intermetallic coatings were characterized by the scanning electron microscope (SEM) equipped with Energy Dispersive Spectroscope (EDS). The wear properties of the coatings were performed under accelerated dry sliding wear tests. The results obtained from the SEM/EDS analysis; show that the coatings consist of Ni and Ti elements from the feedstock, and the NiTi, NiTi2and NiTi3, intermetallic phases. Dry sliding wear analysis revealed that there is correlation between the hardness and the wear rate. The coatings displayed significant improvement in wear resistance up to 80% compared to the substrate.

Wear Properties of (Ti,V)C/Fe Composite

2013 ◽  
Vol 721 ◽  
pp. 303-307
Author(s):  
Hong Xu ◽  
Yi Chao Ding ◽  
Jing Wang
Keyword(s):  
Sliding Wear ◽  
Composite Coatings ◽  
Wear Test ◽  
Atomic Ratio ◽  
Dry Sliding Wear ◽  
Wear Properties ◽  
Surface Composite ◽  
Wear Weight Loss ◽  
Powder Metallurgy Route

(Ti,V)C particles reinforced Fe-based surface composite coatings were fabricated by in-situ synthesis and powder metallurgy route. The microstructure and wear properties were investigated by scanning electron microscopy and dry sliding wear test. The results show that fine (Ti,V)C particulates distribute uniformly in pearlite matrix; when V/Ti atomic ratio is 0.4, the wear weight loss of the composites achieve minimum.

Microstructure and Wear Properties of High-Pressure Torsion Processed Iron

2017 ◽  
Vol 890 ◽  
pp. 371-374 ◽  
Author(s):  
Hirotaka Kato ◽  
Yoshikazu Todaka
Keyword(s):  
Grain Size ◽  
Vickers Hardness ◽  
Pure Iron ◽  
Sliding Wear ◽  
Size Range ◽  
High Pressure Torsion ◽  
Square Root ◽  
Wear Properties ◽  
High Adhesion ◽  
Wear Tests

Microstructure and sliding wear properties of the sub-microcrystalline pure iron produced by an HPT process were investigated in detail. It was found the grains of pure iron were significantly refined to the submicron size range by an HPT process, and the Vickers hardness of HPT-processed specimens increased with increasing number of turns and distance from the center due to the grain refinement. A linear relationship between the hardness and the inverse square root of grain size (the Hall-Petch relationship) was realized. The HPT process clearly increased the wear resistance, and a linear correlation between the specific wear rate and the inverse of the Vickers hardness was found, which agreed with the Archard wear equation. The wear in SUJ2 ball wear tests was much higher than that in WC-Co ball wear tests owing to the high adhesion between the specimen materials.

Microstructure and Wear Properties of Laser Clad TiN/Co-Based Composite Coating

2010 ◽  
Vol 97-101 ◽  
pp. 1510-1513
Author(s):  
Jun Zhou ◽  
Fa Qin Xie ◽  
Yong Quan Li ◽  
Xiang Qing Wu
Keyword(s):  
Wear Resistance ◽  
Composite Coating ◽  
Composite Coatings ◽  
Solidification Rate ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
Wear Properties ◽  
Wear Tests ◽  
Friction And Wear Tests ◽  
Metal Melting

Co-based composite coatings reinforced by TiN particles were fabricated on Ni-based superalloy substrate by using a 5 kW CO2 laser. The microstructures and phases constitution of the composite coating were studied by means of optical microscope (OM), scanning electron microscopy (SEM) and X-ray diffraction (XRD). The microhardness and wear resistance of the coating were also examined. The results showed that the composite coating was mainly composed of γ-Co, TiN, TiC, (Cr, W)23C6 and Co3Ti. And different solidification morphologies, such as planar, cellular and dendrite, were obtained. Structural transformations were attributed to the temperature gradient and solidification rate in metal-melting region. It was found that the microhardness of the composite coating was enhanced prominently as compared to the substrate region, which should be due to the undissolved TiN and other new complicated phase. Friction and wear tests without lubrication showed that the addition of TiN particles into Co-based coating can improve its wear resistance significantly without evidently increasing the friction coefficient of coating.

scholarly journals Friction-Induced Martensitic Transformation and Wear Properties of Stainless Steel under Dry and Wet Conditions

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 743 ◽  
Author(s):  
Yoon-Seok Lee ◽  
Yuta Kondo ◽  
Mitsuhiro Okayasu
Keyword(s):  
Stainless Steels ◽  
Water Film ◽  
Wear Test ◽  
Wear Properties ◽  
Wear Rates ◽  
Liquid Lubricant ◽  
Test Conditions ◽  
Dry Conditions ◽  
Dry And Wet Conditions ◽  
Wear Tests

The wear characteristics of SUS304 and SUS316 stainless steels were evaluated at the rotation speeds of 100 m/s, 200 m/s, and 300 m/s under dry and wet conditions. The transition of friction-induced martensite occurred in wear-affected regions of two materials, regardless of the wear test conditions. The specific wear rates (Ws) of both stainless steels increase with increasing rotation speeds, regardless of the circumstances. Moreover, Ws of SUS304 and SUS316, obtained under dry conditions, is significantly higher than that of SUS304 and SUS316 obtained under wet conditions, respectively. This is because that the water film on the wet ring can act as a liquid lubricant between the ring and the block during the tests. After the wear tests, the hardness changes of both SUS304 and SUS316 are much higher under dry conditions, compared to those under wet conditions.

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.

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