采用直流反应磁控溅射方法,通过溅射镶嵌靶(CrMoTaNbV)和纯Ti靶制备了(CrMoTaNbVTi)N多主元氮化物薄膜。研究了不同氮气流量比RN(N2/(Ar+N2))对(CrMoTaNbVTi)N薄膜的微观结构、力学性能和摩擦学性能的影响。结果表明,当RN=0%和RN=10%时...采用直流反应磁控溅射方法,通过溅射镶嵌靶(CrMoTaNbV)和纯Ti靶制备了(CrMoTaNbVTi)N多主元氮化物薄膜。研究了不同氮气流量比RN(N2/(Ar+N2))对(CrMoTaNbVTi)N薄膜的微观结构、力学性能和摩擦学性能的影响。结果表明,当RN=0%和RN=10%时薄膜为简单的体心立方结构,当RN=20%,30%,40%时为简单的面心立方结构。随着RN的增大,表面颗粒逐渐减小,断面柱状晶更为致密,同时(CrMoTaNbVTi)N薄膜的残余应力、膜基结合力、硬度和弹性模量逐渐增大,且当RN=40%时达到最大值,分别为-3.3 GPa,352 m N,25.6±1.2GPa和278.8±11.2 GPa。RN=40%制备的氮化物薄膜具有最小的比磨损率,相较合金薄膜降低了约1个数量级,表现出优异的耐磨损性能。展开更多
Atri-polyphosphate was used as a corrosion inhibitor in the seawater prepared coral concrete,and its influence on the corrosion behavior of carbon steel,304 austenitic stainless steel,and 2205 duplex stainless steel w...Atri-polyphosphate was used as a corrosion inhibitor in the seawater prepared coral concrete,and its influence on the corrosion behavior of carbon steel,304 austenitic stainless steel,and 2205 duplex stainless steel was studied by the open-circuit potential,electrochemical impedance spectroscopy,and potentiodynamic polarization,respectively.The results reveal that the corrosion potential and impedance of the reinforcing steel increase,while the corrosion current density decreases with the content of aluminum tripolyphosphate in the coral concrete.A low content of the corrosion inhibitor significantly retards the corrosion of the two stainless steels,but it cannot effectively inhibit the corrosion of the carbon steel in the coral concrete.In general,the carbon steel is unsuitable for the coral concrete for its poor corrosion resistance.In contrast,the stainless steels,especially the 2205 duplex stainless steel,shows an excellent anti-corrosion property in the seawater prepared coral concrete containing a certain amount of inhibitor,which is one of the satisfactory candidate methods to build the long-life coral concrete constructions.展开更多
The influences of cement type, cement content, and curing time on the unconfined compression strength （UCS） of soil-cement were investigated. The influence of groundwater on UCS of soil- cement was also studied. The...The influences of cement type, cement content, and curing time on the unconfined compression strength （UCS） of soil-cement were investigated. The influence of groundwater on UCS of soil- cement was also studied. The experimental results indicate that the soil treated with high grade cement presents a higher UCS. Additionally, the UCS of soil-cement presents linearly increased with the cement content. A logarithm correlation between UCS and curing time presents to forecast the strength development. Compared with the UCS of samples immersed in distilled water, those immersed in groundwater oresent a hizher value.展开更多
基金National Natural Science Foundation of China(51601083)。
文摘采用直流反应磁控溅射方法,通过溅射镶嵌靶(CrMoTaNbV)和纯Ti靶制备了(CrMoTaNbVTi)N多主元氮化物薄膜。研究了不同氮气流量比RN(N2/(Ar+N2))对(CrMoTaNbVTi)N薄膜的微观结构、力学性能和摩擦学性能的影响。结果表明,当RN=0%和RN=10%时薄膜为简单的体心立方结构,当RN=20%,30%,40%时为简单的面心立方结构。随着RN的增大,表面颗粒逐渐减小,断面柱状晶更为致密,同时(CrMoTaNbVTi)N薄膜的残余应力、膜基结合力、硬度和弹性模量逐渐增大,且当RN=40%时达到最大值,分别为-3.3 GPa,352 m N,25.6±1.2GPa和278.8±11.2 GPa。RN=40%制备的氮化物薄膜具有最小的比磨损率,相较合金薄膜降低了约1个数量级,表现出优异的耐磨损性能。
基金Found by the National Natural Science Foundation of China(No.51601074)the Fundamental Research Funds for the Central Universities(Nos.2018B56714 and 2018B07214)+1 种基金the Opening Fund of State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(Chengdu University of Technology)(No.SKLGP2017K011)the Foundation of Key Laboratory of Marine Materials and Related Technologies,Ningbo Institute of Materials Technology and Engineering,Chinese Academy of Sciences(No.2017K08)
文摘Atri-polyphosphate was used as a corrosion inhibitor in the seawater prepared coral concrete,and its influence on the corrosion behavior of carbon steel,304 austenitic stainless steel,and 2205 duplex stainless steel was studied by the open-circuit potential,electrochemical impedance spectroscopy,and potentiodynamic polarization,respectively.The results reveal that the corrosion potential and impedance of the reinforcing steel increase,while the corrosion current density decreases with the content of aluminum tripolyphosphate in the coral concrete.A low content of the corrosion inhibitor significantly retards the corrosion of the two stainless steels,but it cannot effectively inhibit the corrosion of the carbon steel in the coral concrete.In general,the carbon steel is unsuitable for the coral concrete for its poor corrosion resistance.In contrast,the stainless steels,especially the 2205 duplex stainless steel,shows an excellent anti-corrosion property in the seawater prepared coral concrete containing a certain amount of inhibitor,which is one of the satisfactory candidate methods to build the long-life coral concrete constructions.
基金Funded by the National Natural Science Foundation of China(Nos.51009061,51137002)the Chinese Ministry of Water Resources Funds for Science and Technology Promotion(No.TG1137)
文摘The influences of cement type, cement content, and curing time on the unconfined compression strength （UCS） of soil-cement were investigated. The influence of groundwater on UCS of soil- cement was also studied. The experimental results indicate that the soil treated with high grade cement presents a higher UCS. Additionally, the UCS of soil-cement presents linearly increased with the cement content. A logarithm correlation between UCS and curing time presents to forecast the strength development. Compared with the UCS of samples immersed in distilled water, those immersed in groundwater oresent a hizher value.
