真空渗流法制备泡沫铝及其动态力学性能的研究

以真空渗流法制备陶瓷中空球泡沫铝,研究了应变率对吸能量和吸能效率的影响、相对密度对屈服强度的影响,并与普通泡沫铝进行比较。结果表明,工艺简单可行,所制备的泡沫铝的动态压缩应力-应变曲线只有弹性变形区和塑性变形区;随应变率的增大,屈服强度和吸能效率变化规律不明显,吸能量增大;随相对密度的增大,屈服强度增大,吸能量增大,吸能效率也增大;动态压缩时两种泡沫铝的吸能效率均较高,最大吸能效率大于0.9,是良好的吸能材料。     

热处理工艺对6063铝合金强度和导电率的影响

研究了热处理工艺参数(如时效温度、时间等)对6063铝合金的强度和导电率的影响。结果表明，低温长时间和高温短时间都可以提高强度，而随着时效温度的提高和时效时间的延长，6063铝合金的导电率呈上升趋势。     

Filiform corrosion attack on pretreated aluminum alloy with tailored surface of epoxy coating

In the study, on the basis of material analysis of 6016 aluminum alloy widely used in Europe automotive industry, the influences of surface pretreatment on filiform corrosion and adhesion of epoxy coating/aluminum alloy interface were investigated, and the effect of rolling direction and coating property on filiform corrosion was also examined. The alloy surfaces were pretreated with etching solution, and then, respectively, with Aminopropyl silane solution, Aminopropyl phosphonate solution, and hexamethyldisiloxane plasma.The results showed that the susceptibility of pretreated surface to filiform corrosion was basically consistent with the distribution of intermetallic particles, and that water permeation and the tensility of coating were necessary for filament to grow. HMDSO plasma pretreatment could not only efficiently cover the matrix of 6016 aluminum alloy and cathodic intermetallic particles containing Al, Si, Mn, and Fe, but also apparently promote the adhesion of epoxy coating/aluminum alloy, as a result, the specimens with plasma pretreatment exhibited the superior performance in the filiform corrosion and peeling tests, so it was suitable to apply for the pretreatment of aluminum alloy in automotive industry.     

智能打壳装置

在一台HAL 2 3 0电解槽上安装了 5个带有节能系统 (EnergySavingSystem)的汽缸和一个可用于快速测试寿命的“虚拟”ESS汽缸。测试的目的是使用ESS系统在正常操作中估计空气节省量和证明包括ESS系统在内的打壳装置的预期寿命周期能达到 8年。测试表明ESS系统的预期寿命超过 8年 ,与传统系统相比 ,可节省 5 9%的空气。如果全部使用该系统 ,可节省 65 %的能量。     

铝合金车轮铸造模具CAD/CAE技术的应用

随着计算机应用技术的发展，CAD/CAE技术已广泛应用于各行各业的设计，主要介绍了铝合金年轮铸造模具上应用CAD/CAE技术的成效。     

Technological condition in slurry electrolysis of high-silver galena concentrate

Effects of various technological conditions such as ρ(C1^- ), ρ(Fe)T, pH value and temperature on the cell voltage, lead leaching rate and the cathodic current efficiency of the slurry electrolysis of high-silver galena concentrate were studied, and the behavior regularity of lead and silver was investigated. As a result, the suitable condition was determinedas, ρ(C1^-)230g/L, ρ(Fe)T15g/L, pH 1, temperature 70℃, electrolysis time 6h. Under such condition,adopting the cathodic current density of 150 A/m2 and the liquid-solid ratio of 15 : 1, lead powder with a purity degree of 91. 18% was got. At the same time, leaching rate of lead, leaching rate of silver and cathodic current efficiency amounted to 96.88%, 70.88% and 75.68% respectively.     

MAZDA 620活塞金属型设计

介绍了MAZDA620活塞重力铸造模具的设计方法与过程。模具的设计、制造过程中运用了计算机辅助技术，进行了浇注过程的计算机模拟。发现浇注成形时可能出现的缺陷，并进行合理的改进。针对在试模过程中所出现的气孔和冷隔缺陷，采取了在相应位置上加装导气塞、将模具温度控制在240℃左右和料温控制在780℃等措施，使得该模具在技术上达到使用要求，得到理想的铸件。     

新型倾斜板技术制备半固态铝合金坯料和浆料

采用自行设计的波浪型倾斜板,在斜板冷却条件下制备了组织和触变性能优良的半固态合金坯料。而在斜板加热条件下制备出了组织优良的半固态合金浆料。在采用波浪型的倾斜板制备半固态合金过程中,在熔体爆发形核与枝晶破碎的共同作用下,形成了细小球形的半固态合金组织,浇注温度、冷却强度、斜板倾角和斜板表面材质是影响半固态合金组织的主要因素。得出了本试验条件下制备AlMg3合金半固态坯料的浇注温度范围为660~690℃;制备AlSi6Mg2合金半固态坯料的浇注温度范围为660~680℃;制备AlSi6Mg2半固态合金浆料的合理工艺条件为:斜板预热温度为300℃时,合金浇注温度为680℃。     

Ambient temperature cured TiB_2 cathode coating for aluminum electrolysis

1　INTRODUCTIONAluminumindustryhasbeendevelopingrapidlyinChinainrecentyears ,soderbergcellshavebeenre placedwithmodernprebakecellsinmanyaluminumsmelters,theaveragecelllifehowever ,forprebakecellsinourcountrywasonlyabout130 0d ,muchlowerthantheaveragecelllife ,i.e .above 2 5 0 0d ,forthecellsindevelopedcountries .TiB2 cathodecoating (TCC)couldbeoneofthesolutionstoreducegreatlytheopportunitytotheearlyfailureofcellsandextendthecelllifeofprebakecell[14 ] .Theconceptoftitaniumdiboride (TiB2 …     

Al2O3-Al-C材料加热过程的变化

按w(板状刚玉)=84%,w(铝粉)=8%,w(α-Al2O3微粉)=6%,w(鳞片石墨)=2%的配比配料,外加3%热固性酚醛树脂作结合剂,成型后于200℃烘烤24h。在埋炭条件下于600～1400℃保温3h加热处理,冷却后测量试样的线变化率、显气孔率和常温耐压强度,并分析部分试样的孔径分布、相组成和显微结构,同时测定烘烤后试样在600℃、800℃、1000℃、1200℃和1400℃下的热态抗折强度,以分析该材料在加热过程的变化。结果表明,试样在600～1400℃埋炭加热过程中的变化可大致分为3个阶段:1)600～800℃,金属Al于660℃熔化,促进试样致密化,在800℃时已有少量Al4C3和AlN生成,使加热后试样的致密度和强度增大;2)800～1200℃,大量生成Al4C3和AlN,Al4C3和AlN填充在刚玉骨架结构中,试样的显气孔率进一步减小,常温耐压强度和热态抗折强度进一步增大;3)1200～1400℃,金属Al消失,Al4C3含量减少,部分与N2反应转化为AlN,试样的显气孔率略有降低,常温耐压强度和热态抗折强度略有增大。由此可见,随着加热温度的提高,材料的结合方式从碳结合转变为碳和金属铝复合结合,最后逐渐转变为碳和非氧化物复合结合。