L.Chen
,
Z.Y.Liu
,
D.C.Zeng
,
W.Q.Qiu
,
Z.H.Yuan
,
S.S.Lin
,
H.J.Hou
金属学报(英文版)
DLC super-hard films have been deposited on the substrates of single crystalline Si, pure Ti and stainless steel 18-8 by a method of vacuum cathode arc deposition (VCAD). The composition, microstructure and micro-hardness of the films have been studied in this paper. The results indicate that hardness of the DLC films is different on the different substrates. Hardness of the films increases with decreasing in surface roughness of the films. The maximum value of micro-hardness belongs to the DLC films deposited under the hydrogen pressure of 0.35Pa and the neqative bias of 100V.
关键词:
DLC films
,
null
,
null
X.W.Shi
,
Z.Y.Liu
,
D.C.Zeng
,
C.M.Li
金属学报(英文版)
Ni-Cr and Fe-Cr-Al films deposited on the Al2O3 substrate are studied by a method of vacuum evaporation in this paper. Influence of resistance value on density and evap-oration parameters of the films reveals that the resistance of films and the adhesion of films to substrates are determined by the evaporation time and the substrate temperate under the condition of the maximum vacuity of 6.2×10^-4Pa, resvectively.
关键词:
vacuum evaporation
,
null
,
null
Y.F.Hu
,
H.Shen
,
Z.Y.Liu
,
L.S.Wen
金属学报(英文版)
Poly-crystalline sihcon thin film has big potential of reducing the cost of solar cells.In this paper the preparation of thin film is introduced, and then the morphology of poly-crystalhne thin film is discussed. On the film we developed poly-crystaUine silicon thin film solar cells with efficiency up to 6.05 165194876thout anti-reflection coating.
关键词:
poly-crystalline silicon thin film
,
null
,
null
X.M.Zhao
,
D.Wu
,
L.Z.Zhang
,
Z.Y.Liu
金属学报(英文版)
Microalloying elements in high-strength low-alloy steels, such as Nb, Ti and V, precipitate during hot-rolling processes. On the basis of classical theory of nucleation and growth, quantitative modeling of isothermal precipitation was developed, which was tested by the stress relaxation method, the calculated precipitation-time-temperature curve is in good agreements with the measured results, then the model was applied to predict the precipitation behavior during continuous cooling.
关键词:
isothermal precipitation
,
null
,
null
何恩全
,
马文会
,
刘荣辉
,
于洁
,
戴永年
稀有金属
doi:10.3969/j.issn.0258-7076.2007.04.019
采用了甘氨酸-硝酸盐法制备了La0.7Sr0.3Cr0.5-yMn0.5-zCo(y+z)O3(y, z=0.1, 0.2)系列阳极材料.借助XRD, SEM对所制备的材料进行了物相和形貌分析.XRD表明利用GNP法制得的粉体在1350 ℃烧结5 h可以形成完整的钙钛矿相;SEM分析可知所得物料颗粒呈球状,尺寸约为1 μm,且没有团聚现象.同时,XRD显示La0.7Sr0.3Cr0.5Mn0.4Co0.1O3和La0.9Sr0.1Ga0.8Mg0.2O3电解质之间具有较好的化学相容性.采用直流四探针法测试了不同组成材料在250～800 ℃温度范围内在空气中的电导率,发现该系列材料在该温度段范围符合小极化子导电机制.另外,利用直流四探针法测试了La0.7Sr0.3Cr0.5Mn0.4Co0.1O3在不同还原气氛下的电导率,在CH4和H2气氛中,La0.7Sr0.3Cr0.5Mn0.4Co0.1O3最大电导率分别达到了4.5和0.42 S·cm-1.
关键词:
钙钛矿
,
阳极
,
电导率
黄曼青
,
周全
,
刘峰
,
黄金角
材料导报
doi:10.11896/j.issn.1005-023X.2016.22.010
研究了0~1.4 T的直流磁场对陶瓷型铸造 Mg-Y-Cu-Zr 合金结晶取向和力学性能的影响。结果表明直流磁场对合金的初生相没有明显影响，但磁场强度大于1.12 T时，合金第二相的分布变得不连续。当磁场强度小于0.84 T时，α-Mg在(002)面的衍射峰逐渐增强，但变化不明显；当磁场强度大于0.84 T 时，α-Mg 基体在(002)、(101)面的衍射峰强度明显减弱，而在(100)晶面衍射峰强度有所增强。磁场处理后，合金的综合力学性能得到了改善；当磁场强度为1.4 T 时，其抗拉强度和伸长率最高，分别为237 MPa 和8.5%，较无磁场处理时分别提高了38.6%和33.4%。
关键词:
直流磁场
,
Mg-Y-Cu-Zr合金
,
结晶取向
,
力学性能
Ying Liy Changzhen Wang Zhongli Zhang Jiangxin Wang
材料科学技术（英）
The steel contains a small amount of hydrogen which will escape during the heat treatment. The hydrogen pressure in 16MnRE steel was investigated with a hydrogen sensor, which used SrCe0:95Yb0:05O3-α proton conductor as a solid electrolyte, YHx+YH2-z as a solid state reference electrode and Ni wire as electrode constructing a hydrogen concentration cell, shown as Ni|YHx+YH2-z |SrCe0:95Yb0:05O3-α |[H]steel |Ni. The response time of sensor is less than 10 s. The relational expression of hydrogen partial pressure with temperatures was determined using two shape proton conductors. The results showed the regularity in experimental temperature range, and the hydrogen partial pressure increased as its temperature was raised.
关键词:
Hydrogen sensor
,
Proton conductor
,
Solid electrolyte
