Tribological Performances of FeS Solid Lubrication Duplex Layer under Liquid Paraffin Oil with n-Al2O3 Lubrication

2011 ◽  
Vol 291-294 ◽  
pp. 1526-1531 ◽  
Author(s):  
Chun Hua Hu ◽  
Jian Huang ◽  
Hai Shan Zhao ◽  
Shi Ning Ma ◽  
Yu Lin Qiao
Keyword(s):  
Surface Layer ◽  
Synergistic Effect ◽  
Friction Factor ◽  
Chemical Reaction ◽  
Liquid Paraffin ◽  
Solid Lubrication ◽  
Volume Loss ◽  
Nano Scale ◽  
Paraffin Oil ◽  
Plain Surface

FeS solid lubrication duplex layer was prepared on the surface of 45 steel by ion nitrocarburizing-ion sulphurizing process. The sulphide grains and holes all in micron and nano scale and distributing equably in the sulphide surface layer with 10 μm thickness of the duplex layer. The duplex layer is composed of FeS, FeS2 and Fe3N. Under liquid paraffin oil with 0.1wt% n-Al2O3 lubrication, the synergistic effect between n-Al2O3 and the duplex layer is produced, and the chemical reaction films including sulphide, sulphate and nitride is formed, which makes the friction factor of the duplex layer keep being the lowest and about 0.07, and the volume loss is reduced by 97% than that of the plain surface(rubbing for 10 min), and reduced by 92% and 21% than that of the sulphurized surface and the nitrocarburized surface, respectively.

Study on Tribological Behaviors of FeS Solid Lubrication Duplex Layer under n-Fe3O4 Additive Lubricating

2013 ◽  
Vol 652-654 ◽  
pp. 1427-1431 ◽  
Author(s):  
Chun Hua Hu ◽  
Feng Jun Qi ◽  
Hai Jiang ◽  
Qian Liu ◽  
Xin Zhang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Friction Factor ◽  
Chemical Reaction ◽  
Liquid Paraffin ◽  
Solid Lubrication ◽  
Volume Loss ◽  
Nano Scale ◽  
Tribological Behaviors ◽  
Paraffin Oil ◽  
Plain Surface

FeS solid lubrication duplex layer was prepared on the surface of 45 steel by ion nitrocarburizing and ion sulphurizing process. The sulphide grains in micron and nano scale and holes distributing equably on the duplex layer. The duplex layer is composed of FeS, FeS2 and Fe3N. Under liquid paraffin oil with 0.2wt%n-Fe3O4 lubricating, the synergistic effect between n-Fe3O4 and the duplex layer is produced, and the chemical reaction films including sulphide, sulphate and nitride is formed, which makes the friction factor of the duplex layer keep being the lowest and about 0.075, and the volume loss is reduced by 91% than that of the plain surface, and reduced by 89% and 21% than that of the sulphurized surface and the nitrocarburized surface, respectively.

Tribological Performances and Friction Reduction Mechanism of N-Al2O3/FeS Solid Lubrication Duplex Layer

2010 ◽  
Vol 146-147 ◽  
pp. 243-247 ◽  
Author(s):  
Chun Hua Hu ◽  
Qiu Pu Liu ◽  
Feng Jiang ◽  
Shi Ning Ma ◽  
Yu Lin Qiao ◽  
...  
Keyword(s):  
Loading Condition ◽  
Friction And Wear ◽  
Liquid Paraffin ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Oil Lubrication ◽  
Reduction Mechanism ◽  
Nano Scale ◽  
Paraffin Oil ◽  
Dipping Process

FeS solid lubrication duplex layer was prepared on the surface of 45 steel by ion nitrocarburizing-ion sulphurizing process. The sulphide grains in micron and nano scale and holes distributing equably on the duplex layer. The n-Al2O3 particles in liquid paraffin oil were set into the holes in micron and nano scale of the duplex layer by using vacuum dipping process to prepare the n-Al2O3/FeS solid lubrication duplex layer. Friction and wear performances of the n-Al2O3/FeS solid lubrication duplex layer were investigated to be excellent under different loads and temperatures. The causes are as follows: the solid lubrication function of FeS solid lubrication duplex layer, the “micron nano bearing” function of the nanoparticles embedded in the micron nano pores of FeS solid lubrication duplex layer, and oil lubrication are integrated by nanoparticles/FeS solid lubrication duplex layer and exert synergic lubrication function under high temperature and over loading condition. so the coefficients of friction and volume loss of the n-Al2O3/FeS solid lubrication duplex layer under load 60N and temperature 150°C are 10% and 31.3% lower than those of the FeS solid lubrication duplex layer lubricated by the n-Al2O3 additive, respectively.

Study on Tribological Performances of n-Na2B4O7/ion Nitrocarburized Duplex Layer at Different Temperatures

2014 ◽  
Vol 1004-1005 ◽  
pp. 1305-1310
Author(s):  
Chun Hua Hu ◽  
Zhi Chang Deng ◽  
Bao Shan Bian ◽  
Long Li ◽  
Hai Tao Wang
Keyword(s):  
Wear Resistance ◽  
Friction Factor ◽  
Chemical Reaction ◽  
Friction Surface ◽  
Intermediate Frequency ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Volume Loss ◽  
Different Temperatures ◽  
Higher Temperature

The paper studied the tribological performances of n-Na2B4O7/ion nitrocarburized duplex layer at different temperatures. It is found that the n-Na2B4O7/ion nitrocarburized duplex layer has more excellent friction reduction and wear resistance performances than the intermediate frequency quenched surface under CD15W-40 oil lubricating at different temperatures, especially at the higher temperature 100°C, the friction factor and volume loss of the duplex layer is 63% and 96% less than that of the intermediate frequency quenched surface respectively, which indicates that n-Na2B4O7/ion nitrocarburized duplex layer can play more excellent friction reduction, wear resistance and scuffing resistance performances at the relative higher temperature. This because that the chemical reaction films including oxide, BN and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7 particles on the friction surface play the "Micron nanobearing" function.

Friction and Wear Performances of n-Na2B4O7/Ion Nitrocarburized Duplex Layer at Different Frequences

2014 ◽  
Vol 1046 ◽  
pp. 62-67
Author(s):  
Chun Hua Hu ◽  
Jun Xue ◽  
Zhi Chang Deng ◽  
Shan Jun Wang ◽  
Hai Tao Wang
Keyword(s):  
Wear Resistance ◽  
Friction Factor ◽  
Chemical Reaction ◽  
Friction Surface ◽  
Friction And Wear ◽  
Intermediate Frequency ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Volume Loss

The paper studied the friction and wear performances of n-Na2B4O7/ion nitrocarburized duplex layer at different frequences. It is found that at frequence 10 Hz, 20 Hz, 30 Hz, respectively, the friction factor and volume loss of the duplex layer is 64%, 60%, 50% and 97%, 91%, 95% less than that of the intermediate frequency quenched surface, respectively, which indicates that the n-Na2B4O7/ion nitrocarburized duplex layer has more excellent friction reduction and wear resistance performances than the intermediate frequency quenched surface under CD15W-40 oil lubricating at different frequences. This because that the chemical reaction films including oxide, BN and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7 particles on the friction surface play the "Micron nanobearing" function.

Study on Friction Reduction and Wear Resistance Process and Composition of FeS Solid Lubrication Duplex Layer

2012 ◽  
Vol 502 ◽  
pp. 60-66 ◽  
Author(s):  
Chun Hua Hu ◽  
Jia Ping Zou ◽  
Jiu Juan Qian ◽  
Ding Yun Jin ◽  
Xiao Feng Sun
Keyword(s):  
Wear Resistance ◽  
Surface Layer ◽  
Diffusion Layer ◽  
Steel Surface ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Wear Volume ◽  
Load Bearing Capacity ◽  
Lubricating Property ◽  
Plain Surface

The composition of FeS solid lubrication duplex layer on 45 steel surface was studied by using SEM, EDS, AES and XPS. The results show that the sulphurized surface layer of FeS solid lubrication duplex is composed of the sulphide aggradation layer deposited on the nitrocarburized sub-surface layer and the sulphide diffusion layer formed by some S element infiltrating the nitrocarburized surface. The sulphide aggradation layer is mainly composed of FeS and FeS2, the key composition of the sulphide diffusion layer is FeS, and Fe(2/3/4)N is the key composition of the nitrocarburized sub-surface layer. The result of friction reduction and wear resistance test combined with the composition of FeS solid lubrication duplex layer explains that the friction coefficient and wear volume of the duplex layer are lower than those of the plain surface, which attribute to the relatively softer sulphurized surface layer provided self-lubricating property while the harder nitrocarburized sub-surface layer provided sufficient load bearing capacity in view of resistance to plastic deformation, so that spallation failure of the sulphurized surface layer can be effectively avoided, and they exert excellent friction reduction and wear resistance functions in different moments during rubbing process respectively.

Evaluation on Combustion Properties of Nanoparticle as Fuel Additive

2011 ◽  
Vol 335-336 ◽  
pp. 1516-1519 ◽  
Author(s):  
Yong Qiang Ren ◽  
Zhi Ning Huang ◽  
Yan Fu
Keyword(s):  
Liquid Paraffin ◽  
Fuel Additive ◽  
Average Particle ◽  
X Ray ◽  
Paraffin Oil ◽  
Transmission Electron ◽  
Combustion Properties ◽  
Fuel Oils ◽  
Save Energy ◽  
Similar Crystal Structure

To improve combustion properties of fuel oils, save energy and reduce pollution, the metal nanoparticles modified by fatty acids have been prepared. The dispersion capacities of these modified nanoparticles in liquid paraffin oil were examined, and were characterized by X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared spectrum (FTIR) . The results show they possess similar crystal structure as organic shell, and average particle diameters, which are in agreement with their excellent oil-solubilities. Moreover, the properties of the modified nanoparticles additives in boiler fuel were evaluated by means of oxygen bomb relative method as regards energy saving and residual products lowering. The results show that the efficiency of combustion and decrement of residual products for fuels were improved to different degree. Therefore, notable economic and social benefits are brought.

Enhanced fenton-like catalysis by facilely prepared nano-scale NCFOH/HKUST composites with synergistic effect for dye degradation

2021 ◽  
Vol 258 ◽  
pp. 123980
Author(s):  
Doufeng Wu ◽  
Nini Tian ◽  
Xiying Sun ◽  
Mei Wang ◽  
Jing Huang ◽  
...  
Keyword(s):  
Synergistic Effect ◽  
Dye Degradation ◽  
Nano Scale

Variations of a Ni-P Surface Layer After Nanoparticle Impacts

2005 ◽  
Author(s):  
J. Xu ◽  
J. B. Luo ◽  
G. S. Pan ◽  
W. Zhang ◽  
X. C. Lu
Keyword(s):  
Surface Layer ◽  
Microscopic Examination ◽  
Wear Mechanisms ◽  
Erosive Wear ◽  
Experimental Results ◽  
Phosphorus Concentration ◽  
Fluid Medium ◽  
Abrasive Particles ◽  
Nano Scale ◽  
Surface Collision

In CMP, erosive wear regarded as one of the wear mechanisms underlying the interaction between the abrasive particles and polished surfaces can occur when materials are removed from surface collision of particles which are carried by a fluid medium. In this paper, the microscopic examination of the NiP coatings after nanoparticle impacts is performed. The experimental results indicate that craters and scratches can be observed in the surface after nanoparticle impacts, and crystal grains in nano-scale and element phosphorus concentration can be found in the sub-surface layer of the impacted surface.

Numerical Investigation of Combustible Channel Walls Ignited by Gas Flow

2014 ◽  
Vol 1013 ◽  
pp. 295-299
Author(s):  
Oleg V. Matvienko ◽  
Aleksei Bubenchikov
Keyword(s):  
Surface Layer ◽  
High Temperature ◽  
Heat Exchange ◽  
Chemical Reaction ◽  
Gas Flow ◽  
External Boundary ◽  
Self Heating ◽  
Conjugate Formulation ◽  
Ignition Characteristics ◽  
High Temperature Gas

A study is made of the process of ignition of reactive channel walls by a laminar flow of hot gases, including the stages of heating of a substance and of reacting in the surface layer with self-acceleration of the chemical reaction. The process is determined by the heat exchange between the gas and the wall, the strength of the heat source in the chemical-reaction zone, and the sink of heat due to conduction in the radial and axial directions. In the stage of self-heating, we can have heat sink not only deep into the wall and/or through its external boundary but into the gas flow as well. The problem has been solved in a conjugate formulation. The influence of the temperature, the velocity of the gas at the entrance to the channel, and the wall thickness on ignition characteristics has been studied.In spreading a high temperature gas flow in a channel which walls are made of reactable material there appears a problem dealing with the possibility of their ignition by the flow.

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