Jun DU
,
Ping ZHANG
材料科学技术（英文）
Ti-containing carbon films were deposited by using magnetron sputtering deposition. The composition and microstructure of the carbon films were characterized in detail by combining the techniques of Rutherford backscattering spectrometry (RBS), X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD) and transmission electron microscopy (TEM). It is found that carbon films contain Ti 18 at pct; after Ti incorporation, the films consist of titanium carbide; C1s peak appears at 283.4 eV and it could be divided into 283.29 and 284.55 eV, representing sp2 and sp3, respectively, and sp2 is superior to sp3. This Ti-containing film with dominating sp2 bonds is nanocomposites with nanocrystalline TiC clusters embedded in an amorphous carbon matrix, which could be proved by XRD and TEM.
关键词:
magnetic sputter deposition
,
磁控溅射
,
碳膜
Zhengyou ZHOU
,
Xiaoshan WU
,
Jun DU
金属学报(英文版)
doi:10.1016/S1006-7191(08)60070-8
Effects of soft-magnetic MnZn ferrite (Mn0.5Zn0.5Fe2O4, MZF) and hard-magnetic Ba
ferrite (BaO?6Fe2O3, BaM) on the structure and magnetic transport properties of [La2/3Sr1/3MnO3]
(LSMO)/(x) [ferrites] (ferrites=MZF, BaM) composites have been investigated. It was found that the inclusion of MZF phase reduces
magnetization and ferromagnetic-paramagnetic transition temperature (Tc) of the composites. With increasing the content of the
dopants, the high-temperature magnetoresistance (MR) decreases, whereas low-temperature MR increases and reaches 42% at 150~K and
x=0.1. However, for the LSMO/BaM composites, magnetization and ferromagnetic-paramagnetic transition temperature (Tc)
decrease firstly as x<5 %, and then increase as x>5 %. The resistivity of the composites increases by five orders of magnitude
at x=1 % and is out of measured range at x=5 %. High magnetic field has little effect on the resistivity and magnetoresistance for
the composites with x>5 %, which may originate from the pinning effect of BaM grains.
关键词:
Composites
,
null
,
null
,
null
严东旭
,
刘天伟
,
龙重
,
白彬
,
张鹏程
,
黄河
,
郎定木
,
王晓红
,
朱建国
材料保护
采用单一的表面改性技术难以提高贫铀钛合金(Du-Ti)的耐蚀性能.采用等离子体浸没离子注入技术依次在Du-Ti合金表面注入N和Ti,再利用非平衡脉冲磁控溅射技术制备多层Ti/,TiN,研究了膜层的形貌、结构及耐蚀性能.结果表明:膜层厚约3μm,呈柱状结构,致密,但存在一些微缺陷,膜基结合紧密;膜层出现面心立方结构的TiN和密排六方的Ti,在DU-Ti合金界面形成了少量的UO2,没有铀的氮化物;膜层耐蚀性能较基体得到较大提高;微观缺陷是TiN层局部片状脱落的主要原因,外层TiN出现片状脱落后.注入层和内层Ti/TiN多层膜仍能有效保护基体.
关键词:
等离子体浸没离子注入
,
非平衡磁控溅射
,
复合膜
,
DU-Ti合金
,
电化学腐蚀
,
耐蚀性
李星星
,
杨科
,
张磊
,
刘强
工程热物理学报
本文提出了风力机翼型完整的性能参数体系和相应的评估方法,并以此评估了CAS-W1翼型与DU翼型的性能特征.对翼型性能的评估侧重于失速特性、非设计点特性和翼型气动性能的稳定性.评估结果表明,相对于DU翼型,CAS-W1翼型系列设计点性能和非设计点性能较好,但是失速特性和性能稳定性需要优化.
关键词:
风力机专用翼型
,
气动性能评价
,
失速特性
,
稳定性参数
欧阳艳东
,
黄翀
,
余云鹏
,
林舜辉
功能材料与器件学报
doi:10.3969/j.issn.1007-4252.2003.04.020
通过测量ITO玻璃及偏光片对各波段紫外光的光谱特性,分析比较一般偏光片和防紫外偏光片F1225DU的紫外透射光谱,从而说明新型偏光片的防紫外特性.F1225DU对紫外线有比较好的吸收,能挡住各种波长的紫外光,起防止紫外光破坏液晶显示器件的作用.
关键词:
偏光片
,
紫外光
,
液晶显示器
,
透射光谱
蒋兴元
,
魏季和
,
温丽娟
,
李波
上海金属
doi:10.3969/j.issn.1001-7208.2007.02.008
在几何相似比为1∶4的水模型上研究了150t RH装置内钢液的流动和混合特性及吹气管直径的影响.模型的吹气管内径分别为0.10、0.15和0.2 cm.所得结果表明,该装置的环流量计算式为:Qlp＝0.0291Qg0.323Du0.65Dd0.84(t/min),式中Qg-提升气体流量, Nl/min;Du和Dd-上升管和下降管内径,cm.在给定的Qg、Du和Dd下,吹气管直径din的变化对液体的流态没有显著影响,环流量则略有改变,在(0.40～0.80)cm的范围内,Qlp＝0.0304Qg0.322Du0.651Dd0.839din0.07.在Du和Dd均为53 cm、din为0.60 cm的情况下,该装置内钢液的最大("饱和")环流量约为135.1 t/min,相应的Qg为2500 Nl/min.钢包内钢液的混合效果随Qg的增大迅速提高.增大din使混合时间τm(s)略有缩短,对应于0.10,0.15和0.20 cm的孔径,τm与搅拌功率密度ε(W/t)的关系分别为:τm ∞ε-0.497,τm ∞ε-0.493和Tm∞ε-0.476.
关键词:
150t RH装置
,
水模型
,
流动特性
,
混合特性
,
物理模拟
,
吹气管直径
张磊
,
杨科
,
徐建中
,
张明明
,
白井艳
工程热物理学报
钝尾缘翼型气动特性受到尾涡脱落的影响,在翼型DU 91-W2-250的基础上对称加厚得到了新钝尾缘翼氆DU91-W2-250_6,利用密网格进行了非定常气动特性的数值研究.在各个攻角下钝尾缘翼型气动特性都具有周期性的特点,具体的波动特征如波动幅值及周期等则受脱落涡的大小、脱落位置及尾迹宽度的影响,而升力系数波峰、波谷则分别出现在顺时针涡及逆时针涡脱落的时刻.
关键词:
翼型
,
钝尾缘
,
非定常
白井艳
,
杨科
,
黄宸武
,
刘强
,
徐建中
,
张磊
工程热物理学报
本文根据翼型表面压力分布对边界层的影响，分析翼喇表面压力分布的特点，以XFOIL计算软件为设计平台，采用其中的混合反设计模块，通过合理改变翼型表面的速度分布来得到气动特性满意的翼型。所设计的翼型主要要求具有高的设计升力系数、高的最大升阻比、良好的前缘粗糙不敏感性及和缓的失速特性。在提高设计升力系数的同时限制最人升力系数，以减小两者的差值，减小叶片的极限载荷。经计算分析，采用反设计优化得到的翼型与DU翼型相比具有很好气动特性。
关键词:
反问题设计
,
速度分布
,
气动特性
Gang YU
,
Xueyuan ZHANG
,
Yuanlong DU
材料科学技术（英文）
Based on the electrochemical permeation technique and the patent by Du, an intelligent electrochemical measurement system for determination of the hydrogen distribution in the wall of hydrogenation reactor has been developed and tested. It consists of a PC computer, a single chip unit, an I/V converter and an electrochemical hydrogen probe. The construction of the electrochemical hydrogen probe is described and the features of the measured system are given. The diffusion coefficient of 2.25Cr1Mo steel determined with present system was in good agreement with the value in the literature. Experimental results of hydrogen concentration in a wall of hydrogen charged testing autoclave made of AISI 321 stainless steel are presented. The present system can intelligently display hydrogen amount-of-substance concentration and mass fraction concentration, hydrogen concentration distribution curves in steels, permeation current density curve. An intelligent detection technique can be provided for predicting the susceptibility to hydrogen-induced cracks owing to hydrogen permeation in the wall of hydrogenation reactor in the field.
关键词:
