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The two steps thermal decomposition of titanium hydride and two steps foaming of Al alloy

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Science China Chemistry 2005年第6期48卷 523-529页

作者： SHANG Jintang he deping South-east University Nanjing 210096 China South-east University Nanjing 210096 China

Two steps foaming (TSF) technique was proposed to prepare shaped Al alloy foam. Based on the thermal decomposition kinetics equation of titanium hydride, the relationship be-tween two steps thermal decomposition kinetics of titanium hydride and two steps foaming Al alloy melt was studied. Two steps thermal decomposition curve of titanium hydride under in-creasing and constant temperature was calculated respectively. The hydrogen mass needed in the second foaming step was also calculated. Results showed that the hydrogen mass of the second thermal decomposition of titanium hydride is enough for the second foaming step in the condition of as-received Al melt foaming. Experimental and theoretical results indicate that two steps foaming technique can be used to prepare Al alloy foam with high porosity, shaped com-ponents and sandwich with Al alloy foam core.

关键词： two steps foaming, titanium hydride, thermal decomposition kinetics, Al alloy foam, shaped components.

Fabrication of Open-cell Al Foam Core Sandwich by Vibration Aided Liquid Phase Bonding Method and Its Mechanical Properties

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Journal of Materials Science & Technology 2010年第5期26卷 423-428页

作者： Hui Wang Donghui Yang Siyuan he deping he Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 China1 College of Mechanics and Materials Hohai University Nanjing 210098 China State Key Laboratory of Bioelectronics School of Biological Science and Medical Engineering Southeast University Nanjing 210096 China

The open-cell Al foam core sandwiches（AFCSs） were successfully fabricated by using a specially designed Zn-Al-Cu based filler alloy via vibration aided liquid phase bonding *** effects of the vibration on the bonding seam were investigated and the bonding strength between Al foam core and solid Al alloy face sheet was tested by shearing *** results show that vibration can significantly improve the quality of the bonding and the shearing strength of the bonding seam,which implies that this joining method has a good potential in practical applications.

关键词： Open-cell Al foam core sandwich Liquid phase bonding Vibration

Changes in porosity of foamed aluminum during solidification

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Chinese Science Bulletin 2000年第18期45卷 1667-1672页

作者： Zhaojin Wu deping he Southeast Univ Dept Mat Sci & Engn Nanjing 210096 Peoples R China

In order to control the porosity of foamed aluminum, the changes in the porosity of foamed aluminum melt in the processes of foaming and solidification, the distribution of the porosity of foamed aluminum, and the relationship between them were studied. The results indicated that the porosity of foamed aluminum coincides well with the foaming time.

关键词： foamed aluminum solidification change of porosity.

Thermal decomposition kinetics of titanium hydride and Al alloy melt foaming process

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Science China Chemistry 2004年第6期47卷 512-520页

作者： YANG Donghui he deping YANG Shangrun Department of Materials Science and Engineering Southeast UniversityNanjing 210096China Department of Chemistry Nanjing UniversityNanjing 210093China

A temperature programmed decomposition (TPD) apparatus with metal tube structure, in which Ar is used as the carrier gas, is established and the TPD spectrum of titanium hydride is acquired. Using consulting table method (CTM), spectrum superposition method (SSM) and differential spectrum technique, TPD spectrum of titanium hydride is separated and a set of thermal decomposition kinetics equations are acquired. According to these equations, the relationship between decomposition quantity and time for titanium hydride at the temperature of 940 K is obtained and the result well coincides with the AI alloy melt foaming process.

关键词： titanium hydride thermal decomposition kinetics parameter kinetics equation TFD spectrum AI alloy melt foaming process

New type of spherical pore Al alloy foam with low porosity and high strength

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Science China Chemistry 2004年第5期47卷 407-413页

作者： ZOU Yi he deping JIANG Jiaqiao Department of Material Science and Engineering Southeast University Nanjing 210096 China Department of Material Science and Engineering Southeast University Nanjing 210096 China Department of Material Science and Engineering Southeast University Nanjing 210096 China

A computer system for displacement sensor is developed to obtain the real-time curve of the liquid porosity of molten Al alloy foam. The relationship between the curve ofP I-t and the change of the shape of the cells (spherical, similar spherical and polygonal) in the foaming process is analyzed. The changes of cell diameter and cell wall thickness are studied. And the the controlling methods of a new Al alloy foam with spherical pores, low porosity and high strength are developed on this basis. Also, the stress-strain curve during compressive deformation and energy absorption characteristics are investigated and compared with polygonal pore Al alloy foam with high porosity. Keywords spherical pore - low porosity - high strength - interface shifting - Al alloy foam These authors contributed equally to this work.

关键词： spherical pore, low porosity, high strength, interface shifting, Al alloy foam.

Detection Method for Cascading Failure of Power Systems Based on Epidemic Model

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CSEE Journal of Power and Energy Systems 2024年第3期10卷 1356-1370页

作者： Jian Xu Zhonghao he Siyang Liao Yuanzhang Sun Liangzhong Yao deping Ke Jun Yang School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China IEEE

The early detection of cascading failure plays an important role in the safe and stable operation of the power system with high penetration of renewable *** paper proposes a fault propagation dynamic model based on the epidemic model,and further puts forward a method to detect the development of cascading *** the simulation of the IEEE 39-bus and 118-bus systems,this model is proven to be valid and capable of providing practical technical support for the prevention of cascading failures in power systems with high penetration of renewable *** paper also provides an analysis method for the choice of different protection and control measures at each stage of cascading failure,which has critical significance and follow-up value.

关键词： Cascading failure complex network epidemic model fault propagation renewable energy weight method of game theory

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铝合金熔体在多孔介质中的二维微管渗流模型

材料研究学报 2006年第4期20卷 389-393页

作者：刘兵何思渊何德坪东南大学南京210096

在对填料颗粒堆积简化的基础上,建立了由渗流单元组成的二维微管模型．使用该模型对渗流过程进行模拟计算,渗流时间的计算值与实验值符合良好,并获得渗流过程的如下新规律:铝熔体在流过填料颗粒时,在填料颗粒的背压区封闭一定质量的气体... 详细信息

在对填料颗粒堆积简化的基础上,建立了由渗流单元组成的二维微管模型．使用该模型对渗流过程进行模拟计算,渗流时间的计算值与实验值符合良好,并获得渗流过程的如下新规律:铝熔体在流过填料颗粒时,在填料颗粒的背压区封闭一定质量的气体,封闭的气体使附加孔隙率和通孔度增大．在渗流过程中静压力的变化分两个阶段:渗流开始时,静压力先缓慢增加,在渗流结束时瞬间,压力增加到最大值;后者对高孔隙率多孔铝的制备有重要意义．这些渗流规律为控制渗流过程和孔结构提供了依据．

关键词：金属材料颗粒堆积渗流单元渗流路径数值模拟

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泡沫Al孔结构的影响因素

材料研究学报 2000年第3期14卷 277-282页

作者：吴照金何德坪东南大学材料科学与工程系南京市210096 东南大学

揭示了泡沫化过程中Al熔体泡沫孔隙率、导热系数的变化规律，研究了泡沫Al的孔隙率、孔径以及导热系数的变化规律及其对应关系,结果表明：Al熔体泡沫的孔结构及导热系数随泡沫化时间而变化.Al熔体泡沫的孔结构直接影响其凝固后的孔结构... 详细信息

揭示了泡沫化过程中Al熔体泡沫孔隙率、导热系数的变化规律，研究了泡沫Al的孔隙率、孔径以及导热系数的变化规律及其对应关系,结果表明：Al熔体泡沫的孔结构及导热系数随泡沫化时间而变化.Al熔体泡沫的孔结构直接影响其凝固后的孔结构，而导热系数则间接影响孔结构.

关键词：液态孔隙率导热系数泡沫铝铝溶体

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多孔铝合金连通孔对压缩性能的影响

材料研究学报 2009年第4期23卷 380-386页

作者：何思渊龚晓路何德坪东南大学生物科学与医学工程学院生物电子学国家重点实验室南京210096 法国特鲁瓦工业大学机械系特鲁瓦法国10000 东南大学材料科学与工程学院江苏省先进金属材料高技术研究重点实验室南京210096

根据多孔铝渗流制备过程中孔结构的形成规律建立了单元模型,其中改变渗流压力引起的通孔度变化所产生的孔隙率变化规律符合物理模型.通过对不同孔隙率的孔结构单元模型计算,结合实验研究了孔隙率变化引起的孔结构变化,并计算了通孔多孔... 详细信息

根据多孔铝渗流制备过程中孔结构的形成规律建立了单元模型,其中改变渗流压力引起的通孔度变化所产生的孔隙率变化规律符合物理模型.通过对不同孔隙率的孔结构单元模型计算,结合实验研究了孔隙率变化引起的孔结构变化,并计算了通孔多孔铝力学性能的影响规律.结果表明,模型计算得到的材料弹性模量、塑性变形平台应力与实验结果基本相符,孔与孔之间通孔度的变化决定了通孔多孔铝的孔隙率变化,受压缩时在连通孔处的应力集中是其力学性能对孔隙率敏感的直接因素.

关键词：金属材料多孔铝合金通孔度孔结构模型压缩力学性能