The combined micro arc oxidation （MAO） and a hybrid beam deposition process was used to deposit duplex （Si：N）-DLC/MAO coatings on AZ80 magnesium alloy. The microstructure and composition of the duplex coatings we...The combined micro arc oxidation （MAO） and a hybrid beam deposition process was used to deposit duplex （Si：N）-DLC/MAO coatings on AZ80 magnesium alloy. The microstructure and composition of the duplex coatings were analyzed by Raman spectroscopy, X-ray photoelectron spectroscope （XPS）, scanning electron microscope （SEM） and atomic force microscopy （AFM）. Tribological behaviors of the coatings were studied by ball-on-disk friction test. It was found that the ID/IG ratio of the （Si：N）-DLC （diamond-like carbon） top films increases with decreasing C2H2/N2 ratio. The （Si：N）-DLC top film with SigN4 was formed on the MAO coated sample as the C2H2/N2 ratio was 10sccm：5sccm, which showed an increasing critical load compared with the pure DLC directly deposited on the Mg alloy substrate. As a result, the （Si：N）-DLC/MAO coating exhibited an advanced wear protection for the substrate.展开更多
It is worthy of studying the effect of water content in crude oil on tribological behavior of stator rubber,because the different water content would affect the swelling and wear of rubber.Compatibility of dewatered c...It is worthy of studying the effect of water content in crude oil on tribological behavior of stator rubber,because the different water content would affect the swelling and wear of rubber.Compatibility of dewatered crude oil and water was observed after mixture of dewatered crude oil and water(called oil-water mixture)was mechanical stirred and statically placed.Static etching experiment of samples in oil-water mixture was performed using hanging patch test.Wetting contact angle of oilwater mixture on rubber surface was measured by contact angle meter.Tribological behavior of samples in mixture was measured using a ring-on-block tester.The result shows that when the water content is less than 15%,water can blend with dewatered crude oil,and oil-water separation happens when water content was more than 15%.With the increasing of water content in crude oil,Wettability of mixture and swelling increment of samples decrease.The wear loss of sample increases after treated by swelling experiment,and FKM owns better wear resistance than NBR.展开更多
基金the financial support of the National Natural Science Foundation of China(Grant No.51201176)Industrialization Project of Education Department of Shaanxi Province(GrantNo.2012JC13)Zhejiang Provincial Natural Science Foundation of China(Grant No.Y2110401)
文摘The combined micro arc oxidation （MAO） and a hybrid beam deposition process was used to deposit duplex （Si：N）-DLC/MAO coatings on AZ80 magnesium alloy. The microstructure and composition of the duplex coatings were analyzed by Raman spectroscopy, X-ray photoelectron spectroscope （XPS）, scanning electron microscope （SEM） and atomic force microscopy （AFM）. Tribological behaviors of the coatings were studied by ball-on-disk friction test. It was found that the ID/IG ratio of the （Si：N）-DLC （diamond-like carbon） top films increases with decreasing C2H2/N2 ratio. The （Si：N）-DLC top film with SigN4 was formed on the MAO coated sample as the C2H2/N2 ratio was 10sccm：5sccm, which showed an increasing critical load compared with the pure DLC directly deposited on the Mg alloy substrate. As a result, the （Si：N）-DLC/MAO coating exhibited an advanced wear protection for the substrate.
基金supported by the National Natural Science Foundation of China (50878178)Liaoning Provincial Natural Science Foundation of China (2013020039)
文摘It is worthy of studying the effect of water content in crude oil on tribological behavior of stator rubber,because the different water content would affect the swelling and wear of rubber.Compatibility of dewatered crude oil and water was observed after mixture of dewatered crude oil and water(called oil-water mixture)was mechanical stirred and statically placed.Static etching experiment of samples in oil-water mixture was performed using hanging patch test.Wetting contact angle of oilwater mixture on rubber surface was measured by contact angle meter.Tribological behavior of samples in mixture was measured using a ring-on-block tester.The result shows that when the water content is less than 15%,water can blend with dewatered crude oil,and oil-water separation happens when water content was more than 15%.With the increasing of water content in crude oil,Wettability of mixture and swelling increment of samples decrease.The wear loss of sample increases after treated by swelling experiment,and FKM owns better wear resistance than NBR.
