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ACRT-B法生长的MnxCd1-xIn2Te4晶体的溶质分凝特性

常永勤 , 介万奇 , 郭喜平 , 陈福义 , 安卫军

功能材料

研究了ACRT-B法生长的Mn0.1Cd0.9In2Te4晶体中界面的形状和各组元沿轴向的分布规律及其分凝因数.发现结晶界面为椭球形;采用理想配比生长MnxCd1-xIn2Te4晶体,其4种组元并不按(Mn,Cd):In:Te=1:2:4比例结晶,而是要重新分布;通过数学方法处理实验数据得到Mn,Cd和In的分凝因数在α相区分别为1.286、1.9257和0.7294,在β相区则分别为1.12、1.055和0.985.

关键词: ACRT-B法 , MnxCd1-x In2Te4 , 界面 , 分凝因数

Formation of PFZ and Its Effect in a RSP AI-Li Alloy

Liang ZHEN Yuexian CUI Dezhuang YANG Department of Materials Science , Harbin Institute of Technology , Harbin , 150006 , ChinaShenglong DAI Guifu YU Beijing Institute of Aeronautical Materials , Beijing 100095 , China

材料科学技术(英)

The formation of precipitation free zone (PFZ) and its effect in a RSP AI-Li alloy has been studied. The results show that PFZ is easy to form when aged at 190℃,but there is no equilibrium phase on grain boundaries.The growth of PFZ in the alloy is different from that in conventional AI-Li alloys, The effect of PFZ is of great importance because of its large volume fraction in the alloy.It offsets the beneficial effect of RSP,and is thought to be an important factor that leads to the poor toughness and low ductility of RSP AI-Li alloy sheet.

关键词: precipitation free zone , null , null , null

Bridgman法生长的MnxCd1-xIn2Te4晶体相形成规律和物理性能研究

常永勤 , 安卫军 , 郭喜平 , 介万奇

无机材料学报

采用Bridgman法生长了x为0.1,0.22和0.4的四元稀磁半导体化合物MnxCd1-xIn2Te4晶体.研究了三根晶体中相的形貌、结构、成分和Mn0.1Cd0.9In2Te4晶体中各组元沿轴向和径向的成分分布.晶体生长初始端的组织为α+β+β1,随着生长的进行,形成β相的单相区.在晶锭末端,形成In2Te3类面心立方结构化合物.组分x增大后,MnxCd1-xIn2Te4晶体的吸收边向短波方向移动,禁带宽度则线性增大.磁化率测量结果表明:晶体在高温区的x-1-T曲线服从居里-外斯定律,在低温区(<50K)则表现出顺磁增强现象.

关键词: MnxCd1-xIn2Te4 , compositional distribution , infrared transmission spectra , mag- netic susceptibility

Bridgman法生长的MnxCd1-xIn2Te4晶体相形成规律和物理性能研究

常永勤 , 安卫军 , 郭喜平 , 介万奇

无机材料学报 doi:10.3321/j.issn:1000-324X.2003.02.004

采用Bridgman法生长了x为0.1,0.22和0.4的四元稀磁半导体化合物MnxCd1-xIn2Te4晶体.研究了三根晶体中相的形貌、结构、成分和Mno.1Cd0.9In2Te4晶体中各组元沿轴向和径向的成分分布.晶体生长初始端的组织为α+β+β1,随着生长的进行,形成β相的单相区.在晶锭末端,形成In2Te3类面心立方结构化合物.组分x增大后,MnxCd1-xIn2Te4晶体的吸收边向短波方向移动,禁带宽度则线性增大.磁化率测量结果表明:晶体在高温区的x-1-T曲线服从居里一外斯定律,在低温区(<50K)则表现出顺磁增强现象.

关键词: MnxCd1-xIn2Te4 , 成分偏析 , 红外透射光谱 , 磁化率

DETERMINATION OF ACTIVITY OF AI IN SOLID Cu-Al ALLOYS

ZHANG Qianxiang , University of Science and Technologys Beijing , Beijing , China

金属学报(英文版)

Activities and activity coefficients of Al in solid Cu-AI alloys have been determined by meansof solid electorlyte galvanic cells Al(a_1 , in alloy), Al_2O_3 ZrO_2·Y_2O_3 Ni, NiOand Al(a_1, in alloy), Al_2O_3 Na, βAl_2O_3 Al(a_2 , in alloy), Al_2O_3

关键词: Cu-Al alloy , null , null , null , null

EFFECTS OF DIFFUSION WELDING PARAMETERS ON JOINT STRENGTH OF SiCw/6061AI COMPOSITE

L.M. Liu , J.T. Niu , Z.H. Lai , Y.L. Guo and J.P. Zhai (National Key Laboratory of Advanced Welding Production Technologyt HIT , Harbin 150001 , China)

金属学报(英文版)

Diffusion welding was used to join SiCw/6061AI composites. The effects of welding pammeters on strength Of welded joint were investigated. JOint Of high quality for SiCw/6061Al composites can be obtained with aPPropriate diffesion welding parameters.

关键词: diffusion welding , null

低伤害高温酸化缓蚀剂AI-811的开发及机理

王宝峰 , 胡恩安

腐蚀科学与防护技术

低伤害、耐高温缓蚀剂AI-811是以咪唑啉季铵盐为主 体,并复合含S、含酮、含酰胺的混合成分,适用于HCl、盐酸/氢氟酸(HCl/HF)及醋酸等 有机混合酸液体系.其主要特点是高温缓蚀效果好,可预防或大大降低酸液对低渗储层的伤 害,使用浓度低,气味极小,与酸液中的其他添加剂配伍性好,适用性强,与缓蚀增效剂AI -800协同使用可在高达190℃下显示独特的优良缓蚀性能. 用CC-10-S高温高压动态腐蚀实验仪对AI-811的高温缓蚀性能进行了评价.结果表明:AI-811 及其AI-800在高温、高压、动态条件下对各种酸溶液具有很好的缓蚀效果,可使N-80油管 钢在高达190℃的储层温度下腐蚀速度大幅度降低,平均腐蚀速度<100 g/m2·h.

关键词: 酸化缓蚀剂 , high temperature , corrosion

低伤害高温酸化缓蚀剂AI-811的开发及机理

王宝峰 , 胡恩安

腐蚀科学与防护技术 doi:10.3969/j.issn.1002-6495.2001.05.011

低伤害、耐高温缓蚀剂AI-811是以咪唑啉季铵盐为主体,并复合含S、含酮、含酰胺的混合成分,适用于HCl、盐酸/氢氟酸(HCI/HF)及醋酸等有机混合酸液体系.其主要特点是高温缓蚀效果好,可预防或大大降低酸液对低渗储层的伤害,使用浓度低,气味极小,与酸液中的其他添加剂配伍性好,适用性强,与缓蚀增效剂AI-800协同使用可在高达190℃下显示独特的优良缓蚀性能.用CC-10-S高温高压动态腐蚀实验仪对AI-811的高温缓蚀性能进行了评价.结果表明:AI-811及其AI-800在高温、高压、动态条件下对各种酸溶液具有很好的缓蚀效果,可使N-80油管钢在高达190℃的储层温度下腐蚀速度大幅度降低,平均腐蚀速度<100 g/m2@h.

关键词: 酸化缓蚀剂 , 腐蚀 , 高温

Electromagnetic filteration of primary Fe-rich phases from AI-Si alloy melt

Zhenming XU , Tianxiao LI , Da SHU , Yaohe ZHOU

材料科学技术(英)

Electromagnetic filtration primary Fe-rich phases (complex compound of AlFeSiMn) from Al-Si alloy melt containing 1.2 wt pet Fe have been studied by theoretical analysis and on a self-designed electromagnetic filtration equipment. The principle of the electromagnetic filtration is that the EMF (electromagnetic force) scarcely acts on the primary Fe-rich phases having low electric conductivity, which are then moved in the direction opposite to that of the EMF. Experimental results show that the primary Fe-rich phases are separated from AI-Si alloy melt and are collected in the filter while the melt is in horizontal flow. The removal efficiency of the primary iron-phases (eta) calculated is less as the greatest flow velocity of the melt (u(M)) and the height of the filter (2h) are larger, while it becomes larger as EMF, operating distance of electromagnetic force (x) and particle size (d(p)) become larger. It has been confirmed that the primary iron-phases larger than 20 mum can be removed efficiently by theoretical analysis and experiments. This new technique is high efficient and available for continuously flowing melts as compared with natural settling and filtration methods, which offer a Possibility for recycling high quality aluminum alloys.

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