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.

Effect of n-Na2B4O7 Additive on Tribological Performances of Ion Nitrocarburized Layer

2015 ◽  
Vol 1120-1121 ◽  
pp. 254-259
Author(s):  
Chun Hua Hu ◽  
Hai Jiang ◽  
Yun Feng Du ◽  
Hai Peng Wang ◽  
Zhi Chang Deng
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Sliding Friction ◽  
Synergetic Effect ◽  
Rolling Friction ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Higher Temperature ◽  
Different Content ◽  
Nitrocarburized Layer

The paper studied the effect of n-Na2B4O7additives of different content on tribological performances of the ion nitrocarburized layer. It is found that 7% n-Na2B4O7additive can improve greatly the friction reduction and wear resistance of the ion nitrocarburized layer under different conditions. This because that synergetic effect of friction reduction and wear resistance is produced between n-Na2B4O7additive and ion nitrocarburized layer under higher temperature, frequence and load, and the chemical reaction films including oxide, nitride, BN, and sulphide and so on formed on the friction surface play the solid lubrication function, and the n-Na2B4O7particles on the friction surface play the "Micron nanobearing" function, translating the sliding friction into the rolling friction, which can make the ion nitrocarburized layer possess the excellent tribological performances.

Effect of n-LaB4O7 Additive on Tribological Behaviors of Ion Nitrocarburized Layer at Higher Temperature

2015 ◽  
Vol 1120-1121 ◽  
pp. 249-253
Author(s):  
Chun Hua Hu ◽  
Jun Xue ◽  
Yun Kai Wang ◽  
Ya Zhi Li ◽  
Zhi Chang Deng
Keyword(s):  
Wear Resistance ◽  
Friction Surface ◽  
Synergetic Effect ◽  
Friction Reduction ◽  
Solid Lubrication ◽  
Tribological Behaviors ◽  
Temperature Load ◽  
Higher Temperature ◽  
Nitrocarburized Layer

The paper studied the effect of n-LaB4O7additives of different contents on tribological behaviors of the ion nitrocarburized layer at higher temperature. It is found that 7% n-LaB4O7additives can improve obviously the tribological performances of the ion nitrocarburized layer. This because that synergetic effect of friction reduction and wear resistance is produced between the n-LaB4O7additives and ion nitrocarburized layer under higher temperature, load and frequence, and the solid lubrication films including oxide, nitride and sulphate and so on are formed on the friction surface to separate the contact between the metal sufaces, and furthermore the n-LaB4O7particles on the friction surface play the "Micron nanobearing" function, which make the ion nitrocarburized layer have the more excellent tribological performances.

Effect of Temperature on Tribological Performances of Ion Nitrocarburized Layer of 42MnCr52 Steel

2013 ◽  
Vol 750-752 ◽  
pp. 389-392
Author(s):  
Chun Hua Hu ◽  
Feng Jun Qi ◽  
Meng Liang Lu ◽  
Guo Ning Wang ◽  
Qian Liu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Friction Factor ◽  
Wear Scar ◽  
Friction Reduction ◽  
Effect Of Temperature ◽  
Different Temperatures ◽  
Higher Temperature ◽  
Plain Surface ◽  
Nitrocarburized Layer ◽  
Scar Width

The paper studied that effect of temperature on tribological performances of ion nitrocarburized layer of 42MnCr52 steel under CD15W-40 oil lubricating. It is found that the ion nitrocarburized layer has more excellent friction reduction and wear resistance performances than the plain surface under different temperatures, especially under the higher temperature 150°C, the friction factor and wear scar width of ion nitrocarburized layer is 36% and 77% less than that of the plain surface respectively, which indicates that ion nitrocarburized layer can play more excellent friction reduction, wear resistance and scuffing resistance performances under the relative higher temperature.

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 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 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.

Study of Graphite in Al2O3 Ceramic with Copper Matrix

2007 ◽  
Vol 280-283 ◽  
pp. 1115-1118
Author(s):  
Chang Hong Li
Keyword(s):  
Friction Factor ◽  
Friction Surface ◽  
Copper Matrix ◽  
Solid Lubrication ◽  
Al2o3 Ceramic ◽  
Graphite Content ◽  
Lubrication Film ◽  
Wear And Tear

Graphite is introduced into Al2O3 ceramic with copper matrix. The influence of graphite content to friction factor and wear and tear of Al2O3 ceramic with copper matrix has been studied in this paper. Friction factor of ceramic with copper matrix decreases with the increase of graphite content at first. After graphite content exceeds more than 3%, friction factor stops reduction. Wear and tear decrease with the increase of graphite content from the beginning. After graphite content surpasses more than 3%, it increases instead with the increase of graphite content. When graphite content is 3%, Wear and tear locates the lowest point. Solid lubrication film formed by graphite on the friction surface is the cause that makes friction factor drop.

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