再生专利

废镁合金的回收专利申请号:CN200410080446.6公开号:CN1614045申请人:中国铝业股份有限公司这是一种采用压铸工艺等生产镁合金部件产生的废金属镁合金的回收处理方法。其特征在于回收过程包括向坩埚炉内加入4%～10%的底熔剂熔化后,采用边加入边压实的方法分批加入废镁合金料,升温至720℃～740℃,加入精炼剂精炼,加入精炼剂,搅拌、静置,加入铝锰合金、锌粒,配制标准成分的镁合金。本方法经过一定的表面预处理,利用一定成分氯盐做为保护熔剂,经过化学成分调     

改善废铝再生中Fe相析出形态的工艺试验

废铝再生原料中往往混杂较多的铁质材料,在熔炼与铸造过程中容易出现以粗大片状形态析出的富Fe相,降低再生产品的使用性能。开展了熔剂法改善废铝熔体中富Fe析出形态的工艺试验,以硼砂、氯化锰和Al Ti BRE(质量比为2:2:1)等组成熔剂,在730~750℃加入废铝熔体中,加入量为2%,并在30 min内完成浇注,富Fe析出相以较为规整的形状析出,颗粒较细小且分布较为均匀,铝合金性能明显提高。     

熔炼温度与静置时间对A356铝合金净化效果的影响

在对比不同熔剂对A356铝合金净化效果的基础上,研究了熔炼温度与保温静置时间对净化效果的影响。结果表明,排杂熔剂具有较好的除气除杂效果,随着净化处理温度的升高,排杂熔剂净化处理后的铝合金含杂量与含气量变化比较平稳,保持在一个较低水平;随着保温静置时间的延长,铝液中的含杂含气量保持比较稳定。     

金属再生 利国利民

<正> 所谓再生金属,是指由废旧金属、合金或含金属的废料经重新提炼得到的金属产品,例如熔炼废杂铜得到的再生铜。 世界上许多发达国家,都很重视金属再生或废品回收利用。再生或回收在次发达国家,甚至在发展中国家亦越来越受到人们的重视。     

铝锰青铜球形阀体的砂型铸造

本文介绍的БрАМц9—2铝青铜的熔炼实际施工,得到很好的质量,是值得介绍的,但在熔炼操作中,由于过早的加入了铝铜中间合金,引起生成多量的氧化铝,最后不得不使用熔剂精炼及氯化锌脱气,以致造成一系列的施工困难,伹由于仍然得到比较好的质量,所以仍保留于原文中。铝青铜的熔炼除大量使用废料时采用熔剂以外,如将铝铜中间合金推迟到浇铸前5~10分钟加入,避免生成多量的氧化铝,一般可以不用熔剂,也不必用氯化锌最后脱气。因为熔剂容易成杂质侵入合金中,并且也容易侵蚀坩埚。氯化锌会使合金成分难于控制,所以在操作正常时也以不用为宜。     

废铝再生去除夹杂硅元素的工艺研究

针对废铝原料中Si、Fe等夹杂元素含量高的问题,开展了熔剂法去除废铝熔体中Si元素的工艺试验。熔剂组成为Ca Cl2、Mn Cl2和活性炭(质量比2∶1∶1),采用喷粉方式加入1%~1.5%熔剂,并维持30 min的条件下,除硅率可达10%以上。     

熔剂法去除废铝熔体中镁的试验研究

废铝料中常常镁含量较高,在将废铝料熔炼成再生铝合金时,较高的镁含量有时不符合要求。试验研究了熔剂法去除废铝熔体中镁元素的工艺原理,并设计试验方案、开展了工艺试验。结果表明,用Al F3和Mn Cl2(质量比1∶2)组成的复合熔剂,加入量为1%~1.5%(质量分数),并静置30 min左右时间的条件下,可以达到较为理想的除镁效果。     

废铝熔体中去除夹杂铁元素的工艺试验

开展了熔剂法去除废铝熔体中Fe元素的工艺试验。熔剂的组成为硼砂、硫磺和氯化锰(质量比2∶1∶1),加入量为1.0%~1.5%,并维持30 min的条件下,可以达到较为理想的除铁效     

废铝屑、废铜屑再生回用

我厂生产的95系列风冷柴油机所用铝铸件材质为ZL8、ZL9、ZL11,铜铸件的材质为ZQSn6-6-3,ZQSn10-2,ZQP_(b30)。这些有色金属铸件切削加工产生的大量铜屑、铝屑开始都白白浪费掉了,大五金仓库的工人同志,看在眼里痛在心上。他们遵照毛主席关于“艰苦奋斗”、“勤俭建国”的伟大教导,在各级革委会的支持下,没向国家要一分钱,利用废旧材料,建起了熔化炉,回收废铝、铜屑,为国家节省了不少有色金属材料。废铝屑、废铜屑牌号繁杂,又掺有各种杂质。在回炉熔炼前,要把混杂在废铝屑、废铜屑中的铁屑、铁块、铁丝、破布等物清除掉。熔炼的设备为地坑式焦炭炉,鼓风机为2台功率350瓦、风量9.5米~3/分、风压75毫米水柱的离心式通风机。熔化铝屑时用一台风机;熔化铜屑时用二台风     

废飞机铝合金重熔再生技术的研究

本文介绍了一种再生重熔废飞机铝合金的工艺方法。采用同牌号的合金铝进行重熔再生,再生的材料仍为原牌号且性能应达到一定的质量要求,从而最大限度地再生利用了废飞机铝合金。重熔技术的关键是快速熔化及时除去不熔物并采用复合熔剂进行覆盖和精炼。     

Effects of Post-weld Heat Treatment on Microstructure,Mechanical Properties and the Role of Weld Reinforcement in 2219 Aluminum Alloy TIG-Welded Joints

In as-welded state, each region of 2219 aluminum alloy TIG-welded joint shows diff erent microstructure and microhardness due to the diff erent welding heat cycles and the resulting evolution of second phases. After the post-weld heat treatment, both the amount and the size of the eutectic structure or θ phases decreased. Correspondingly, both the Cu content in α-Al matrix and the microhardness increased to a similar level in each region of the joint, and the tensile strength of the entire joint was greatly improved. Post-weld heat treatment played the role of solid solution strengthening and aging strengthening. After the post-weld heat treatment, the weld performance became similar to other regions, but weld reinforcements lost their reinforcing eff ect on the weld and their existence was more of an adverse eff ect. The joint without weld reinforcements after the post-weld heat treatment had the optimal tensile properties, and the specimens randomly crack in the weld zone.     

The First Phase of the SRIF Industrialized Base in ＂West Area＂ Has Been Put into Operation

After nearly two years＇ tense construction, the first phase of industrialized base of Shenyang Research Institute of Foundry （SRIF）, located at the Tiexi Casting and Forging Industrial Park in the west of Tiexi District, has now been completed and formally put into operation.     

新型的治疗阿尔茨海默氏症药物(1-二甲基磷酰基-2,2,2-三氯)-乙基-1-醇烟酸醋对体外神经细胞的作用

目的: 观察本实验室合成的一种治疗阿尔茨海默氏症(AD)的药物(1-二甲基磷酰基-2, 2, 2 -三氯)-乙基^-1-醇烟酸醋(NMF),对体外培养的皮层神经细胞活性的影响以及对海人藻酸(KA)所致的神经损伤的保护作用。方法: 采用体外培养皮层神经元的方法,解剖分离 15 d胚胎小鼠皮层神经细胞, 接种于 96孔板,48 h 后加药并培养 72 h,以 MIT 法 观察 NMF 对小鼠皮层神经细胞活性的影响;同时将接种于 24 孔板的细胞预先给予 NMF,d 3 时加或不加KA处理后,以台盼蓝染色鉴别并计数死、活细胞,可得出细胞的存活率。结果: NMF 明显促进胎鼠皮层神经元活性,其中 NMF1、0. 1、10nmol·L^-1促进神经元活性增殖率分别高达 34.7%、37.4%、36. 7%, NMF 明显促进正常胎鼠皮层神经元存活卒,与对照组比较,10nmol·L^-1 NMF 对皮层神经元的存活率分别提高 39.3%、73.5%。 NMF能显著 对抗 KA 所致的神经元损伤,与 KA 损伤组相比, NMF0.1、10、10nmol·L^-1对损伤皮层神经元的保护率分别为 77.30%、80.10%、84.15%。结论: NMF 明 显促进胎鼠皮层神经元的洁性、提高正常皮层神经元,的存活卒,并能有效地保护KA所致的神经元损伤,提示 NMF 是一种很有潜力的治疗 AD 的药物。     

THERMODYNAMICS STUDY ON THE DECOMPOSITION OF CHROMITE WITH KOH

Institute of Process Engineering, Chinese Academy of Sciences, China, has proposed a method for oxidative leaching of chromite with potassium hydroxide. Understanding the mechanism of chromite decomposition, especially in the potassium hydroxide fusion, is important for the optimization of the operating parameters of the oxidative leaching process. A traditional thermodynamic method is proposed and the thermal decomposition and the reaction decomposition during the oxidative leaching of chromite with KOH and oxygen is discussed, which suggests that chromite is mainly destroyed by reactions with KOH and oxygen. Meanwhile, equilibrium of the main reactions of the above process was calculated at different temperatures and oxygen partial pressures. The stable zones of productions, namely, K2CrO4 and Fe2O3, increase with the decrease of temperature, which indicates that higher temperature is not beneficial to thermodynamic reactions. In addition, a comparison of the general alkali methods is carried out, and it is concluded that the KOH leaching process is thermodynamically superior to the conventional chromate production process.     

INFLUENCE OF HEAT TREATMENT ON DAMPING BEHAVIOUR OF THE MAGNESIUM WROUGHT ALLOY AZ61

The effect of isochronal heat treatments for 1h on variation of damping, hardness and microstructural change of the magnesium wrought alloy AZ61 was investigated. Damping and hardness behaviour could be attributed to the evolution of precipitation process. The influence of precipitation on damping behaviour was explained in the framework of the dislocation string model of Granato and Lücke.     

Theoretical Analysis for the Motion and Temperature of Melt Droplets in Spray Degassing Process

The motion of melt droplets in spray degassing process was analyzed theoretically. The height of the treatment tank in spray degassing process could be determined by the results of theoretical calculation of motion of melt droplets. To know whether the melt droplets would solidify during spraying process, the balance temperature of melt droplets was also theoretically analyzed. Then proof experiments for theoretical results about temperature of melt droplets were carried. In comparison, the experimental results were nearly similar to the calculation results.     

Growth Kinetics of Single Inclusion Particle in Molten Melts

On the basis of the single-particle framework, a new theory on inclusion growth in metallurgical melts is developed to study the kinetics of inclusion growth on account of reaction and collision. The studies show that the early growth of inclusion depends on reaction growth and Brawnian motion collision, and where the former is decisive, the late growth depends on turbulence collision and Stokes＇ collision, and where the former is dominant; collision growth is very quick during the smelting process, lessened in the refining process, but nearly negligible in the continuous casting process.     

An Easy Way to Quantify the Adhesion Energy of Nanostructured Cu/X(X=Cr,Ta,Mo,Nb,Zr) Multilayer Films Adherent to Polyimide Substrates

An approach based on film buckling under simple uniaxial tensile testing was utilized in this paper to quantitatively estimate the interfacial energy of the nanostructured multilayer films(NMFs) adherent to flexible substrates. The interfacial energies of polyimide-supported NMFs are determined to be *5.0 J/m2 for Cu/Cr, *4.1 J/m2 for Cu/Ta,*2.8 J/m2 for Cu/Mo, *1.1 J/m2 for Cu/Nb, and *1.2 J/m2 for Cu/Zr NMFs. Furthermore, a linear relationship between the adhesion energy and the interfacial shear strength is clearly demonstrated for the Cu-based NMFs, which is highly indicative of the applicability and reliability of the modified models.     

High-Speed Friction Stir Welding of SiC_p/Al–Mg–Si–Cu Composite

A 17 vol% SiCp/Al–Mg–Si–Cu composite plate with a thickness of 3 mm was successfully friction stir welded(FSWed) at a very high welding speed of 2000 mm/min for the first time. Microstructural observation indicated that the coarsening of the precipitates was greatly inhibited in the heat-affected zone of the FSW joint at high welding speed, due to the significantly reduced peak temperature and duration at high temperature. Therefore, prominent enhancement of the hardness was achieved at the lowest hardness zone of the FSW joint at this high welding speed, which was similar to that of the nugget zone. Furthermore, the ultimate tensile strength of the joint was as high as 369 MPa, which was much higher than that obtained at low welding speed of 100 mm/min(298 MPa). This study provides an effective method to weld aluminum matrix composite with superior quality and high welding efficiency.     

Three-Dimensional Growth of Coherent Ferrite in Austenite: A Molecular Dynamics Study

Coherent second phase often exhibits anisotropic morphology with specifi c orientations with respect to both the second and the matrix phases. As a key feature of microstructure, the morphology of the coherent particles is essential for understanding the second-phase strengthening eff ect in various industrial alloys. This letter reports anisotropic growth of coherent ferrite from austenite matrix in pure iron based on molecular dynamics simulation. We found that the ferrite grain tends to grow into an elongated plate-like shape, independent of its initial confi guration. The fi nal shape of the ferrite is closely related to the misfi t between the two phases, with the longest direction and the broad facet of the plate being, respectively, consistent with the best matching direction and the best matching plane calculated via the Burgers vector content(BVC) method. The strain energy calculation in the framework of Eshelby's inclusion theory verifi es that the simulated orientation of the coherent ferrite is energetically favorable. It is anticipated that the BVC method will be applicable in analysis of anisotropic growth and morphology of coherent second phase in other phase transformation systems.