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原位TiC颗粒含量对近液相线铸造7075铝合金二次加热组织的影响
7075铝合金 原位TiC颗粒 二次加热 铸造
2009/6/6
采用原位反应近液相线铸造法制备具有不同原位TiC颗粒含量的TiCp/7075铝基复合材料，在7075铝合金固−液两相区间(477~635 ℃)的580和600 ℃进行二次加热并保温20 min，水淬固定其半固态组织，应用Image Pro Plus软件测量平均晶粒尺寸及形状因子，研究原位TiC颗粒含量对该合金二次加热组织的影响。结果表明：当原位TiC颗粒质量分数为0~4.4%时，随着原...
镧掺杂钙锰氧体/聚吡咯复合物的制备、表征及其电化学性能
聚吡咯 钙钛矿 复合材料
2009/6/4
采用甘氨酸-硝酸盐燃烧法和溶液原位复合技术分别制备了镧掺杂钙锰氧体(La1- x Cax Mn0. 7Co0. 3O3, x = 1. 0, 0. 9, 0. 8 , 0. 7, 0.6) 粉末及其聚吡咯( PPy) 相对质量分数为60 %和80 %的钙锰氧体/ 聚吡咯复合物微粒La0. 3Ca0.7Mn0. 7Co0. 3O3/PPy。借助FTIR、XRD、SEM 和电化学测试等分析手段表征了钙...
燃烧反应超快升温热压制备碳纳米管/氧化铝复合材料
复合材料 碳纳米管 自蔓延燃烧/快速加压
2009/6/4
报道一种制备碳纳米管增强氧化铝基复合材料的新方法,用燃烧反应所产生的热量为热源代替传统烧结炉,在燃烧反应完成的同时施加机械压力来实现快速烧结.当碳纳米管掺量为1%(质量分数)时复合材料的断裂韧性同比提高了50%. 该方法有利于避免碳纳米管的高温破坏,复合材料的增韧作用主要来自于碳纳米管的拔出效应和桥联机制.
Investigations of linear contraction and shrinkage stresses development in hypereutectic al-si binary alloys
Linear contraction Shrinkage stresses Hypereutectic aluminium-silicon alloy
2009/6/2
Shrinkage phenomena during solidification and cooling of hypereutectic aluminium-silicon alloys (AlSi18, AlSi21) have been examined.A vertical shrinkage rod casting with circular cross-section (const...
Application of the Adomian decomposition method for solving the heat equation in the cast-mould heterogeneous domain
Application of information technology to the foundry industry Heat conduction Adomian decomposition method
2009/5/27
The paper is focused on a method for solving the heat equation in a cast-mould heterogeneous domain. The discussed method makes use of the Adomian decomposition method. The derived calculations prove ...
复相导电混凝土应用于损伤诊断的试验研究
导电混凝土 电阻 损伤
2009/5/22
为了研究含有纳米炭黑或碳纤维的导电混凝土梁受荷过程中电阻变化规律与混凝土损伤之间的关系, 通过比拟与试验数据回归分析方法, 先建立混凝土梁电阻变化率与梁几何中性轴处应变的曲线关系, 再结合损伤力学理论, 建立损伤度与电阻变化率的函数关系, 为导电混凝土材料或构件自身电阻诊断其内部损伤提供了新途径。研究表明: 开裂前, 混凝土梁的电阻变化率与梁几何中性轴处应变的关系用一次衰减指数函数方程拟合较好, ...
Energetic conditions of effective recycling of composite castings
Metal composites Recycling Surface energy
2009/5/15
The most reasonable way of recycling the metal composite materials consists in separation of the components. In case of the composites with saturated reinforcement it is the only recycling method. Th...
采用熔铝无压浸渗复合工艺在高体份SiCp/Al复合材料制备过程中同步复合Ti合金零部件(圆柱体),研究了这种跨宏-微观尺度、超混杂铝基复合材料的微观组织及性能,特别是SiCp/Al复合材料与Ti合金零部件之间的相容性。结果表明,复合材料性能优异、组织致密,SiC颗粒分布均匀、无偏聚现象。SiCp/Al复合材料与Ti合金之间的界面结合非常紧密,Ti元素向铝合金基体一侧有一定距离的扩散,并且出现了可增...
Quality of carburizers and its influence on carburization process
Cast iron Carburization Carburizers Effectiveness of carburization
2009/4/21
In the papers issue of production the synthetic cast iron obtaining on the basis of only steel scrap and carburizing materials are presented.Natural graphite, synthetic graphite, anthracite, petroleum...
Quality of carburizers and its influence on carburization process
Cast iron Carburization Carburizers Effectiveness of carburization
2009/4/21
In the papers issue of production the synthetic cast iron obtaining on the basis of only steel scrap and carburizing materials are presented.Natural graphite, synthetic graphite, anthracite, petroleum...
Adhesion of composite carbon/hydroxyapatite coatings on AISI 316L medical steel
Hydroxyapatite Carbon coatings Adhesion Medical steel
2009/4/21
In this paper are contains the results of studies concerning the problems associated with increased of hydroxyapatite (HAp) adhesion,manufactured by using Pulse Laser Deposition (PLD) method, to the...
Adhesion of composite carbon/hydroxyapatite coatings on AISI 316L medical steel
Hydroxyapatite Carbon coatings Adhesion Medical steel
2009/4/21
In this paper are contains the results of studies concerning the problems associated with increased of hydroxyapatite (HAp) adhesion,manufactured by using Pulse Laser Deposition (PLD) method, to the...
几何非线性高性能复合材料筋混凝土梁Heterosis组合壳单元
CFRP筋 几何非线性 组合壳单元
2009/4/20
对于高性能碳纤维增强聚合物复合材料(CFRP)筋混凝土梁，研究几何非线性组合壳单元模型，对预应力CFRP筋混凝土梁进行了全过程分析。引入Von Karman理论，推导了局部坐标系下Piola2Kirchhoff 应力矩阵和几何刚度矩阵；分别采用组合壳单元和分层壳单元模拟预应力CFRP 筋和玻璃纤维增强聚合物复合材料(GFRP)筋，并推导了CFRP筋对组合壳单元刚度矩阵的贡献，同时采用Heteros...
界面作为复合材料中的重要组成部分对其宏观力学性能及破坏模式有着不可忽视的影响. 本文采用自组装薄膜技术对玻璃纤维表面改性, 得到不同表面性质的玻璃纤维, 与环氧树脂基体复合得到不同界面强度的复合材料. 利用带偏光显微镜的拉伸仪, 研究在不同界面强度下玻璃纤维/环氧树脂基复合材料的破坏过程及力学性能. 结果表明, 复合材料在强界面情况下发生脆性破坏, 在弱界面情况下发生韧性破坏, 且增强纤维对复合材...
Application of time-series analysis in foundry production
Process modeling Time-series Forecasting Foundry technology Molding sand
2009/4/14
Characterization of the time-series analysis is presented, as a data mining tool which facilitates better understanding nature of manufacturing process and permits forecasting of future valu...