材料期刊网

FABRICATION AND PROPERTIES OF CERAMIC CEMENTED CARBIDE COMPACT INSERTS

J.Q.Zhou , X.Ai , Z.Q.Li and C.Z.Huang Institute of Mechanical Engineering , Shandong University of Technology , Jinan 250061 , China

金属学报(英文版)

A novel ceramic cemented carbide compact insert was developed using hot pressing sintering technique. The surface layers of the sandwich material were ceramic and the middle layer was cemented carbide. The factors that affect the properties of the compact insert were analyzed. Theoretical analyses and experiments indicated that the cemented carbide with greater elastic module and thermal expansion coefficient than ceramic should be used in the sandwich material in order to get high equivalent flexure strength and the geometric parameters of the compact insert are also important to its properties.

关键词: compact insert , null , null , null

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（英文）

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

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

STRUCTURE AND SURFACE CONDITION OF ULTRAFINE AI PARTICLES

SUN Xiukui CHEN Wenxiu XU Jian FAN Xueshu WEI Wenduo State Key Laboratory of Rapidly Solidified Non-Equilibrium Alloys , Institute of Metal Research , Academia Sinica , Shenyang , ChinaWU Yukun PENG Yingguo Laboratory of Atomic Imaging of Solids , Institute of Metal Research , Academia Sinica , Shenyang , China Associate Professor , Institute of Metal Research , Academia Sinica , Shenyang 110015 , China

金属学报(英文版)

The crystal habit,crystalline structure,surface condition and composition of the ultrafine Al particles prepared by inert gas evaporation method were studied in detail by means of high resolution transmission electron microscope,X-ray diffraction and X-ray photo-electron spectrum.The results indicate that the ultrafine Al particles prepared in high pure inert gas are of clear crystal habits,single crystal in a large majority and fcc crystalline structure with a_0=0.405 nm.It is also found on the surface of the Al particles that there is a layer of amor- phous Al_2O_3 with 2 nm average thickness,which could protect the particles against oxidizing further.Therefore,the ultrafine Al particles prepared by the inert gas evaporation method are very stable in atmosphere.

关键词: ultrafine Al particle , null , null , null

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（英文）

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.

关键词:

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

腐蚀学报（英文）

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

腐蚀学报（英文） 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

PROPERTIES OF IP-TiN COATINGS MODIFIED BY AI AND La

JIN Zhujing YU Li DAI Shaoxia YU Zhiming Institute of Corrosion and Protection of Metals , Academia Sinica , Shenyang , China YU Li Research Assistant , Institute of Corrosion and Protection of Metals , Academia Sinica.Shenyang 110015 , China

金属学报(英文版)

A modified ion-plated TiN(IP-TiN) coating has been developed by adding 6 wt-% A1 and small amounts of La.Examination of this coating showed that the adhesion between the coat- ing and substrate is remarkably improved by the La added up to 2 wt-% ,and the microhardness and wear resistance of the coating surface closely relate to the contents of La.EPMA and X-ray diffraction analysis indicated that a thick transition zone forms owing to the addition of La and A1.The phase composition and grain orientation of the coating change because of the formation of such transition zone.Thus,the properties of coating were improved.

关键词: ion plated TiN coating , null , null , null

Estimation of (gamma+alpha(2)) equilibrium in two-phase Ti-Ai-X alloys by means of sublattice site occupancies of X in tial and Ti3Al

Scripta Materialia

关键词: behavior