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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...
TiB2颗粒增强钛基复合材料抗氧化性能
钛基复合材料 TiB2颗粒 抗氧化性
2009/4/13
采用粉末冶金法制备了TiB2/Ti 颗粒增强钛基复合材料，研究了不同烧结温度(800、900、1000 和1100℃) TiB2/Ti 复合材料在 600、700、800和900℃ 空气中的恒温氧化行为，分析了TiB2对钛基复合材料氧化动力学行为的影响，并对氧化层表面的相组成、 形貌以及氧化层剖面的显微结构进行了分析。结果表明：该复合材料的氧化层表面的氧化产物主要为金红石型 TiO 2 , 此外还...
Al/Al2O3复合材料的伪半固态压缩变形力学行为
Al/Al2O3复合材料 伪半固态 力学行为
2009/3/12
对37%Al/Al2O3复合材料坯料进行高温压缩,研究其伪半固态压缩变形力学行为.结果表明,该材料在伪半固态温度下的高温压缩过程中,真实应力-真实应变曲线存在四个变化阶段:急剧上升-下降-平稳-缓慢上升,且稳态流动应力及峰值应力随着温度的提高和应变速率的降低显著下降,说明该材料具有应变速率和变形温度敏感性.随着变形量的增加,微观组织中的孔洞逐渐增多.
Ag颗粒含量对SnCu基复合钎料性能的影响
Ag SnCu基复合钎料 性能
2009/3/12
利用颗粒增强原理研制了新型Ag颗粒增强SnCu基复合钎料,研究了Ag颗粒不同含量对复合钎料性能影响.结果表明:当Ag含量(体积分数)为5%时,复合钎料铺展面积最大,润湿角最小,钎焊接头蠕变寿命最长,比基体钎料提高23倍.
等离子喷涂制备W丝增强NiAl单层复合材料的界面研究
W丝增强NiAl单层复合材料 等离子喷涂 界面
2009/3/10
采用等离子喷涂法制备了W丝增强NiAl单层复合材料并研究了该材料内部与界面相关的问题。研究表明：作为增强体的W丝与NiAl基体具有较好的稳定性，制备态的W/NiAl界面为非冶金结合，其界面处无元素的互扩散及界面反应发生；在模拟热压工艺的两种退火热处理（800℃/3h,1200℃/48h）状态下，W丝/NiAl界面的结合强度增加，但界面处未出现可见的元素的互扩散层，只是W丝与结晶后NiAl熔滴颗粒之...
V8C7增强铁基复合材料的制备和性能
粉末冶金 原位合成 铁基复合材料
2009/3/6
用一种将粉末冶金和原位合成相结合的全新方法原位合成了V8C7颗粒增强铁基复合材料,对其微观组织、耐磨性及其磨损机理进行了分析,并探讨了Fe-V-C三元体系原位合成V8C7的机理. 结果表明:石墨的存在降低了σ-(FeV)相的稳定性, 使其分解为固溶大量V的α-Fe,C与V发生碳化反应生成V8C7; 原位合成的V8C7颗粒增强铁基复合材料由增强相V8C7和α-Fe相组成, V8C7颗粒均匀分布在珠光...
超临界异丙醇流体制备TiO2/活性炭复合材料
超临界 异丙醇流体 TiO2/活性炭复合材料
2009/3/6
在存在超临界异丙醇介质的条件下,将钛酸异丙酯与活性炭反应生成具有光催化与吸附性能协同效应的TiO$_{2}$/活性炭复合材料.产生协同效应, 可使低浓度污染物快速地表面富集和吸附净化, 加快了污染物的光催化降解速率,TiO$_{2}$的光催化作用又促使被活性炭吸附的污染物向TiO$_{2}$表面迁移,使活性炭吸附能力得以恢复, 实现了吸附剂的原位再生.
超薄壁不锈钢塑料复合管生产技术
超薄壁不锈钢 复合管材 钢塑复合管 挤出成型
2009/3/4
主要技术性能：⒈主要技术内容和技术指标：该项目为塑料与不锈钢管材复合用的生产线，属于新型建筑用管材的生产母机。其技术原理由塑料管挤出设备和超薄壁制管设备组成。性能指标：SJFS-30不锈钢塑料复合管生产线基本参数如下：管径φ20mm-φ32mm；管材壁厚1.6mm-3.0mm；不锈钢带厚0.25mm-0.4mm；焊机电流2-300A；设备总功率150kVA；负荷率50%；压缩空气0.4MPa-0....
The influence of ceramic fibre on thermal expansion of moulding materials for investment casting technology
Lost foam platetes Pattern Polystyrene Temperature
2009/2/26
The paper discusses the process of thermal evaporation of a foundry pattern. At several research-development centres, studies have been carried out to examine the physico-chemical phenomena that take ...
The influence of ceramic fibre on thermal expansion of moulding materials for investment casting technology
Lost foam platetes Pattern Polystyrene Temperature
2009/2/26
The paper discusses the process of thermal evaporation of a foundry pattern. At several research-development centres, studies have been carried out to examine the physico-chemical phenomena that take ...
The influence of grinding parameters of the surface layer of low-alloyed high-speed steel
temperature grinding forces grinding properties secondary austenite
2009/2/26
The measurements of machining forces, temperature and quality parameters of surface layer and ratio of grinding property of selected grades of low-alloyed high speed steels were carried out. It was sh...
The influence of grinding parameters of the surface layer of low-alloyed high-speed steel
temperature grinding forces grinding properties secondary austenite
2009/2/26
The measurements of machining forces, temperature and quality parameters of surface layer and ratio of grinding property of selected grades of low-alloyed high speed steels were carried out. It was sh...
The structure of Ni-enriched Al–Ni molten alloy before solidification
crystallization aluminum–nickel alloys melts short range order intermetallic compounds chemical ordering
2009/2/26
The structure of Ni–based molten alloy, containing 88,02w.%Ni and dopped both with Zr (0,46w.%) and B (0,02w.%) has been studied by means of X–ray diffraction method at temperature 1500 K. Structure f...
The structure of Ni-enriched Al–Ni molten alloy before solidification
crystallization aluminum–nickel alloys melts short range order intermetallic compounds chemical ordering
2009/2/26
The structure of Ni–based molten alloy, containing 88,02w.%Ni and dopped both with Zr (0,46w.%) and B (0,02w.%) has been studied by means of X–ray diffraction method at temperature 1500 K. Structure f...