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improvement of about 100% in micro-hardness compared with untreated materials. The variation of carbon contents with increasing sample depth resulted in a hardened layer of 300 μm in the carburized... of carbon and nitrogen into the titanium alloys respectively [17-19]. As discussed in Refs. [20,21], the carburized layer was formed on the surface of Ti-6Al-4V alloy and TiAl alloy by plasma......
合成抗孕酮新药RU-486中间体3,3-乙撑二氧-5α,10α及5β,10β- 环氧-△9(11)-雌烯-17α(1-丙炔基)-17β醇的薄层分析 高占先1,王肇中2 (1.大连理工大学化工学院;2.北京矿冶研究总院,北京100044) 摘要:采用薄层色谱成功地分离了3,3-乙撑二氧-△5(10),9(11)-雌甾二烯-17α(1-丙炔基)-17β醇的环氧化产物3,3-乙撑二氧-5α,10α-环氧-△9(11)-雌烯-17α(1-丙炔基)-17β醇(简称Iα)和3,3-乙撑二氧-5β,10β-环氧-△9(11)-雌烯-17α(1-丙炔基)-17β醇(符称Iβ),并对Iα和Iβ进行了定性和......
to study the adsorption of atomic sulfur and carbon on the Mg(0001) surface in a wide range of coverages from 1/4 ML(monolayer) to 1 ML. It is found that the adsorption of atomic S and C on the high... In modern industry, Mg and Mg alloys are widely used for their excellent properties of low specific gravity, high specific strength and high recycle rate. Sulfur and carbon are the common impurities......
reaction, and in the second process, the oxidation is the main reaction. The activation energy of the second mass-loss process is 99.6 kJ/mol by isothermal heat-treatments. TG-FTIR analysis shows carbon dioxide, carbon monoxide, hydrogen bromide, phenol and substituent phenol are given off during the pyrolysis of waste epoxy PCBs. Key words: pyrolysis; kinetics; waste; printed circuit boards 1......
reinforced with continuous carbon fiber (CF) was manufactured by hot isostatic pressing (HIP). The morphology, grain size distribution and phase of the powders were investigated by scanning electron... and elongation of the composites increase by above 5% and 54%, respectively, and the fracture mechanism is brittle fracture; the fracture of the Al matrix is along the powder interface, carbon fibers......
Engineering and Science, 2004, 44(11): 2019-2028. [11] ISAYEV A I, KUMAR R, LEWIS T M. Ultrasound assisted twin screw extrusion of polymer-nanocomposites containing carbon nanotubes [J]. Polymer, 2009, 91(1......
wear tester, the sliding tribology behavior of three kinds of C/C composites with different matrix carbon were investigated with 40Cr steel coated by Cr or W18Cr4V steel as couple. The result shows.../smooth lamination/resin carbon is 0.13 and the mass wear loss after 1h test is 1.1mg, and those under 40N test are 0.10 and 0.9mg, respectively, and those under 60N are 0.15 and 3.9mg, respectively. At 200......
. 1 Surface((a), (b)) and cross section((c), (d)) morphologies of common Al foil((a), (c)) and carbon-coated Al foil((b), (d)) 表1所列为采用两款箔材制备的电极片的剥离强度测试结果.表中数据指的是极片单位面积所能承受的压力,表征了二者之间的结合力.对于传统铝箔制... as current collector 图3 传统铝箔和涂碳铝箔锂硫电池的充放电曲线 Fig. 3 Charge-discharge curves of Li-S cell using common Al foil(a) and carbon-coated Al foil(b) 不同箔材制作的锂硫电池的充放电曲线如图3所示.电池放电曲线上的两个放电平台与CV曲线上的两个还原峰对......
进行确定,与实际情况更加接近.几何模型如图3所示. 电解槽主要结构参数如表1所列. 图1 阴极炭块分层 Fig. 1 Slice of cathode carbon block 图2 耦合计算流程图 Fig. 2 Process of coupling calculation 图3 电热场计算几何模型 Fig. 3 ...炭块角部存在应力集中,应力达到80 MPa左右,此处在实际生产过程中可能会产生裂纹,使应力得到释放. 图10 阴极炭块y方向位移和z方向位移 Fig. 10 y-direction (a) and z-direction (b) displacement of cathode carbon block 图11 阴极炭块第一主应力 Fig. 11 ......
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