Effect of La2O3 addition on the microstructure, hardness and abrasive wear behavior of flame sprayed Ni based coatings

Sharma, Sandeep; Dwivedi, D. K.; Jain, P.K.

doi:10.1016/j.wear.2008.12.029

Cited by 120 publications

(49 citation statements)

References 19 publications

(24 reference statements)

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“…It is found that the more CeO 2 additive is added, the coarser the Ti(C,N) phase is. Similar conclusions were reported by Wang et al [22] and Sharma et al [29], namely, the microstructures and properties of the Ni-based coatings decreased when the additive of CeO 2 was higher than 1 wt %. The worse grain refinement of 2 wt % CeO 2 and 3 wt % CeO 2 may be attributed to the agglomeration of CeO 2 nanoparticles.…”

Section: Influence Of Ceo2 Nanoparticles On the Microstructure Of Coasupporting

confidence: 89%

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Chen

Wang

et al. 2018

Metals

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Abstract:To improve the wear resistance of titanium alloy parts used in the engineering applications, in-situ formed Ti(C,N) particles reinforcing Ni-based composite coatings are fabricated on Ti6Al4V alloys by the laser cladding technique using Ni60, C, TiN, and small amounts of CeO 2 nanoparticles mixed powders as the pre-placed materials. Firstly, the formation mechanism of Ti(C,N) particles as a reinforced phase in the coating is investigated. Then, the influences of CeO 2 nanoparticles on microstructures and wear resistance of the coatings are analyzed. It is indicated that the large Ti(C,N) particles form around TiN particles, and the small Ti(C,N) particles form through independent nucleation. CeO 2 nanoparticles play important roles in increasing the nucleation rate and improving the precipitation of Ti(C,N), hence the microstructures and wear resistance of the coatings are apparently improved after adding CeO 2 nanoparticles. It is observed that the 1 wt % content of CeO 2 additive in the pre-placed powders is the best choice for the wear resistance of the coatings.

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Section: Influence Of Ceo2 Nanoparticles On the Microstructure Of Coasupporting

confidence: 89%

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Chen

Wang

et al. 2018

Metals

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“…During furnace fusing processing, these high melting point compounds will float and be removed as molten slag, therefore, the microstructure of the coating with Lanthanum oxide becomes finer and purified with the inclusion number decreasing. On the other hand, due to rather large atomic radius, Lanthanum in the grain leads to distortion of lattice, which push Lanthanum over the grain boundary [10][11][12], so Lanthanum is rich over the grain boundary, the enrichment of Lanthanum on the grain boundary can cause a dragging effect on the growth of grain. As a result, the growth of grain will be prevented and the microstructure is further refined.…”

Section: Methodsmentioning

confidence: 99%

Microstructure and Mechanical Properties of NiCr Alloy Coatings with Lanthanum Oxide Formed by Furnace Fused Processing

Liang¹,

Zhang²,

Guo³

2016

JRST

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nicr coatings with different contents of La 2 o 3 were produced on carbon steel by flame spray and then furnace fused processing. A field emission gun scanning electron microscope (FegSeM), energy dispersive X-ray (eDX) microanalysis and X-ray diffraction analysis (XRD) were employed to observe the microstructure characteristics of the coatings. The effect of La 2 o 3 on microstructure and mechanical properties of coatings was investigated. The result shows that the addition of La 2 o 3 would refine and purify the microstructure of the coatings, when the addition of La 2 o 3 is about 0.8 wt.%, the coatings obtain the highest hardness.

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“…While the Tafel slope ECS Transactions, 28 (26) 3-12 (2010) of Ni-Co-La 2 O 3 composite coating electrode was -166.9 mV dec −1 , indicating that a different mechanism controlled by Volmer-Tafel reaction happened on this electrode [29] . It was assumed that LaNi 5 phase with properties of hydrogen storage alloy was formed [24] , resulting in that the desorption of hydrogen was delayed and, so, the Tafel slope was a little larger than -118 mV dec −1 . On the other hand, energy factor should be considered in order to exclude influence of geometrical factors on hydrogen evolution property.…”

Section: Ecs Transactions 28 (26) 3-12 (2010)mentioning

confidence: 99%

La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

Liang

Chen

et al. 2010

ECS Trans.

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La 2 O 3 was successfully doped into nickel-cobalt alloy coating on Ti substrate by electrodeposition technology.The surface morphology and microstructure were examined by SEM and XRD, respectively, and the hydrogen evolution property was evaluated by electrochemical techniques, including steady-state polarization, Tafel plot and electrochemical impedance spectroscopy. It was found that the incorporated La 2 O 3 particles resulted in the improvement of roughness and surface area of the composite coating electrode, and hydrogen evolution potential of nickelcobalt-La 2 O 3 composite coating electrode moved positively around 178 mV at 15 mA cm -2 compared with that of nickel-cobalt alloy deposited coating electrode. It was assumed that the enhanced electrocatalytic activity to hydrogen evolution was attributed to the improved surface area and the decreased apparent activation energy, which was verified by hydrogen evolution kinetics parameters calculated from Tafel plots and electrochemical impedance spectroscopy.

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Effect of La2O3 addition on the microstructure, hardness and abrasive wear behavior of flame sprayed Ni based coatings

Cited by 120 publications

References 19 publications

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Microstructure and Mechanical Properties of NiCr Alloy Coatings with Lanthanum Oxide Formed by Furnace Fused Processing

La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

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Effect of La2O3 addition on the microstructure, hardness and abrasive wear behavior of flame sprayed Ni based coatings

Cited by 120 publications

References 19 publications

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Laser Cladding In-Situ Ti(C,N) Particles Reinforced Ni-Based Composite Coatings Modified with CeO2 Nanoparticles

Microstructure and Mechanical Properties of NiCr Alloy Coatings with Lanthanum Oxide Formed by Furnace Fused Processing

La2O3-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction

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La₂O₃-Modified Nickel-Cobalt Composite Coating as Cathode Materials for Hydrogen Evolution Reaction