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Nanosized copper powders prepared by gel-casting method and their application in lubricating oil 被引量:4
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作者 Wen-chao CHEN Ji-gui CHENG +4 位作者 Hui-pei CHEN Nan-min gg bang-zheng wei Lai-ma LUO Yu-cheng WU 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2018年第6期1186-1191,共6页
Nanosized copper powders were prepared by a gel-casting method using copper nitrate, acrylamide(AM) and N, N′-methylenebisacrylamide(MBAM) as the main raw materials. The as-prepared copper powders were characteri... Nanosized copper powders were prepared by a gel-casting method using copper nitrate, acrylamide(AM) and N, N′-methylenebisacrylamide(MBAM) as the main raw materials. The as-prepared copper powders were characterized by X-ray diffractometry and scanning electron microscopy, and then added into a 48# industrial white oil. Dispersion and wear properties of the compounded lubricating oil were tested. The results show that the copper powders prepared are of high purity, fine dispersibility with mean particle size of about 60 nm and with a narrow particle size distribution. The nanosized copper powders can be well dispersed in the lubricating oil. The addition of the copper powders obviously improves the anti-wear properties of the lubricating oil owing to their good self-repairing performance. Compared with 48# industrial white lubricating oil, the friction coefficient of GCr15 steel with the compounded oil containing 0.6% copper powders reduces by 0.07 and nearly no wear chippings are found in the scratches of the friction counter parts. 展开更多
关键词 nanosized copper powder gel-casting method compounded lubricating oil anti-wear property
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Effects of Praseodymium Doping on Conductivity and Oxygen Permeability of Cobalt-Free Perovskite-Type Oxide BaFeO3-δ
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作者 bang-zheng wei Yu Wang +2 位作者 Meng Liu Chen-xi Xu Ji-gui Cheng 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2018年第2期191-196,245,246,共8页
Among the perovskite-type oxides with symmetrical structure applied in oxygen permeable membranes, cubic phase structure is the most favorable for oxygen permeation. In order to stabilize the cubic perovskite structur... Among the perovskite-type oxides with symmetrical structure applied in oxygen permeable membranes, cubic phase structure is the most favorable for oxygen permeation. In order to stabilize the cubic perovskite structure of BaFeO3-δ material at room temperature, iron was partially substituted by praseodymium. BaFe1-yPryO3-δ powders were synthesized by a solid state reaction method, and sintered samples were prepared from the synthesized BaFe1-yPryO3-δ powders. X-ray diffraction results reveal that the BaFe1-yPryO3-δ samples remain cubic structure at praseodymium substitution amount of y 0.05, 0.075, 0.1. Scanning electron microscope observation indicates that the sintered samples contain only a small amount of enclosed pores and the grain size of BaFe1-yPryO3-δ increase monotonically with the increase of the praseodymium doping amount, praseodymium doping promotes the grain size growth. Tests of electrical conductivity and oxygen permeation flux show that praseodymium doping improves the conduction properties of BaFe1-yPryO3-δ and BaFe0.9Pr0.1O3-δ composition has an electrical conductivity of 6.5 S/era and an oxygen permeation of 1.112 mL/(cm^2.min) at 900 ℃, respectively. High temperature XRD in- vestigation shows that the crystal structure of BaFe0.975Pr0.025O3-δ membrane completely transform to cubic phase at 700℃. The present test results have shown that partially substitution of Fe by praseodymium in BaFeO3 can stabilize the cubic structure and improve the properties. 展开更多
关键词 BaFe1-yPryO3-δ Praseodymium doping Cubic perovskite Oxygen perme-ability
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