焊后热处理对2091铝锂合金接头组织的影响

本文通过金相显微分析，透电镜观察及硬度测试，研究了２０９１铝锂合金焊后固溶时效处理对焊接接头显微组织的影响。结果表明，２０９１铝锂合金焊接接头中强化析析出数量少是接头弱化的根本原因；采用焊后固溶时效处理，可以改善合金接头组织，获得均匀分布的纱散强化相。     

涟钢CSP钢水酸溶铝的控制

涟钢CSP生产线自投产以来,钢中酸溶铝的控制不稳定,酸溶铝命中率较低。钢中酸溶铝控制过高,会造成铝的浪费;过低,则延长了LF精炼炉调铝的时间。在生产中可以通过调整钢中酸溶铝来控制钢中的夹杂物、组织性能,但不同钢种对酸溶铝的控制要求并不相同。通过现场试验研究,对不同钢种、不同终点氧含量采取不同的调铝工艺,有效提高了酸溶铝的命中率。     

5A90铝锂合金板材的温热拉深成形

在数值模拟研究压边力、毛料直径、凸凹模圆角半径、变形温度等对5A90铝锂合金板材拉深成形影响的基础上,采用正交试验设计方法对拉深成形工艺参数进行了优化设计,并进行了相应的拉深成形试验研究,研究表明,变形温度对拉深成形影响最显著,其次是毛料大小,而变形速度和压边力大小的影响较小,同时,通过对试验结果的计算、分析和总结,获得了5A90铝锂合金板材拉深成形的最佳工艺参数组合,在最佳工艺参数条件下,铝锂合金的拉深系数达到了0.45.     

含钡硅系合金取代铝脱氧的几个工艺理论问题

在炼钢中广泛采用铝脱氧，至今也不过60年左右的历史，但随着工业技术的发展，铝作为炼钢终脱氧剂的唯一首选地位已开始动摇．因为：①铝价格相对较贵；②铝比重轻；不仅无效烧损大，回收率低，而且钢中酸溶铝控制困难；③要求钢中酸溶铝低的小方坯连铸技术的广泛采用；④要求A120。夹杂很低的新产品开发等．为此不少炼钢工作者开始寻找各种新的脱氧剂，以期部分或全部取代铝．含钡硅系合金是在我国得到广泛重视的一种新型复合脱氧剂，从工艺理论上对其进一步深入探讨很有必要．1硅钡复合脱氧剂取代铝对钢液进行深脱氧（l）铝脱氧常数在160…     

铝合金弱侵蚀镜面化学抛光工艺研究

铝合金三酸化学抛光工艺存在溶铝量大,转移性过腐蚀倾向强,不适宜自动线生产等缺点。通过光亮度、溶铝量及过腐蚀现象的观察与检测,研究镍离子的添加、铝离子含量对抛光过程中铝合金的溶解量,溶液的过腐蚀倾向及抛光效果的影响。结果表明镍离子的存在可抑制转移性过腐蚀,提高抛光效果,而抛光液中铝离子含量对溶铝量及过腐蚀均有显著影响,铝离子含量高,抛光液粘度大,溶铝量小,抛光速度慢,过腐蚀的倾向下降。     

用硫酸盐法从锂云母中浸取锂

以锂云母精矿为原料,考察了用硫酸盐法浸取锂时的煅烧温度、煅烧时间、酸矿质量比、酸化焙烧时间等影响因素。结果表明：适当升高煅烧温度、增加煅烧时间、增大酸矿质量比、增加焙烧时间均有利于锂的溶出。最佳反应条件为：950℃煅烧2h,浓硫酸酸化焙烧3h,酸矿质量比为1．5：1,在此条件下锂的溶出率可达到96．95％。     

铝锂合金材料冲击动态特性的实验研究

采用Ｈｏｐｋｉｎｓｏｎ杆技术，对８０９０铝锂合金材料的冲击压缩特性进行了实验研究，并与传统的ＬＹ１２铝合金进行了比较．实验结果表明：不论是在准静态情况还是冲击载荷情况下，在试样变形相同时，８０９０铝锂合金比ＬＹ１２铝合金可承受更高的压应力；并且８０９０铝锂合金对应变率要比ＬＹ１２铝合金敏感．     

预变形对2195铝锂合金力学性能及疲劳裂纹扩展速率的影响（英文）

时效前的预变形处理可增加2195铝锂合金的强度和硬度,但这会加快合金的疲劳裂纹扩展(FCG)速率,从而缩短合金的疲劳寿命。确定合适的预变形-时效工艺制度,在提高2195铝锂合金的强度和硬度的同时尽量降低其对疲劳裂纹扩展速率的影响,是进一步提高铝锂合金服役性能的关键。为此,研究了预变形程度(0、3%、6%和9%)对2195铝锂合金试样的硬度、强度、裂纹扩展速率以及疲劳断裂形貌与析出相等影响规律,揭示预变形对2195铝锂合金力学性能和FCG速率影响的作用机制。结果表明：随着预变形量的增加,T1相密度增加、S′相分布细化,导致合金显微硬度、抗拉强度和屈服强度增加,同时FCG速率加快、合金疲劳寿命缩短。同时,还提供了不同预变形程度下2195铝锂合金FCG速率的计算模型,将弹性模量(E)作为归一化应力强度因子,实现预变形后2195铝锂合金的FCG速率与常数C和K相关联,较好地预测了不同预变形状态下2195铝锂合金的裂纹扩展速率。     

用废铝渣制取高效净水剂——碱式氯化铝的工艺研究

本文叙述了用两段酸溶法从废铝渣生产碱式氯化铝的试验研究。文中阐明了一段溶出中加酸当量比、盐酸浓度和反应时间等因素对铝渣中氧化铝的溶出率和溶出液盐基度的影响以及二段溶出中铝渣投加比对溶出液盐基度的影响等。     

卤水制锂后废液的综合利用研究

国内很多锂业回收锂后的废液中含有大量的铝、氟离子,由于回收成本过高或其它原因而直接排放,造成资源浪费和环境污染.锂厂废液与氨水反应得含铝、氟的复合物沉淀和含氨溶液,试验研究了各参数对铝、氟回收率的影响,得到优化的工艺条件,铝回收率93%,氟回收率92%.将得到的铝、氟复合物与氢氟酸、纯碱反应制备冰晶石,试验研究各参数对合成冰晶石的质量和得率的影响,优化条件下,冰晶石得率96.44%,产品符合冰晶石国家和行业标准.废液处理过程中,没有新的污染物产生,过程经济效益好.     

杂质及Ce含量对Al-Li-Cu-Zr和Al-Li-Mg-Zr合金韧化水平的影响

研究了 Fe,Si,Na,K杂质及 Ce微合金化对 A l-L i-Cu-Zr及 Al-L i-Mg-Zr合金内、外韧化水平的影响 .杂质降低了 Al-L i-Cu-Zr合金的内韧化水平 ,从而降低了其总体韧化水平 .由于 Al-L i-Cu-Zr合金中添加微量 Ce可明显提高材料的内韧化水平及抑制杂质的脆化作用 ,故可改善合金的断裂韧性 .对于Al-L i-Mg-Zr合金 ,Ce的微合金化不能提高材料的韧化水平     

A new perspective on the 5 V discharge capacity of Li/Al doped manganese spinels

A series of manganese spinels LiMn2-yMeyO4 (Me = Li, Al, Mg) were prepared and examined by XRD and electrochemical methods. The spinels doped with Li or high content of Al can exhibit discharge capacity in the 5 V region, but spinels doped with Mg do not exhibit any 5 V discharge capacity. It is also observed that the 5 V discharge capacity of Li/Al doped spinels will be greatly suppressed once calcinated at temperatures above 900 ℃ in preparation. It is suggested that the 5 V discharge capacity of Li/Al doped spinels may be originated from the special chemical/structural characteristics of spinel phases containing Li or high content of Al prepared at temperatures below 900 ℃.     

Melt-spun Al<Subscript>70−<Emphasis Type="Italic">X</Emphasis></Subscript>Si<Subscript>30</Subscript>Mn<Subscript><Emphasis Type="Italic">X</Emphasis></Subscript> (<Emphasis Type="Italic">X</Emphasis>=0, 3, 5, 7, 10) anode in lithium-ion batteries

Al_70−X Si₃₀Mn _X (X=0, 3, 5, 7, 10, mol%) ribbons were prepared by melt spinning. A supersaturated solid solution of Si and Mn in fcc Al and some microstructures consisting of nano grains were obtained. Some alloys with nano-sized grains exhibited high discharge capacities and favorable cycle properties. The capacity of more than 400 mAh/g could be obtained in melt-spun Al₆₇Si₃₀Mn₃ alloy after 20 cycles and more than 300 mAh/g after 40 cycles. Li/Si and Li/Al compounds in the anodes of pure Al and pure Si were not detected in Al-Si-Mn alloys inserted by Li. It is considered that the formation of the supersaturated solid solution and refinement of microstructures have prevented the alloys from the forming the compounds with superfluous Li. As a result, the electrochemical properties have been improved. Supported by the National Natural Science Foundation of China (Grant No. 50371066)     

Melt-spun Al_(70-X)Si_(30)Mn_X (X=0,3,5,7,10) anode in lithium-ion batteries

Al70-XSi30MnX (X=0, 3, 5, 7, 10, mol%) ribbons were prepared by melt spinning. A supersaturated solid solution of Si and Mn in fcc Al and some microstructures consisting of nano grains were obtained. Some alloys with nano-sized grains exhibited high discharge capacities and favorable cycle properties. The capacity of more than 400 mAh/g could be obtained in melt-spun Al67Si30Mn3 alloy after 20 cycles and more than 300 mAh/g after 40 cycles. Li/Si and Li/Al compounds in the anodes of pure Al and pure Si were...     

正交法研究PVC型材废角料的回收再利用

用正交试验设计的方法研究了复合热稳定剂、CPE(氯化聚乙烯)、轻质CaCO3(碳酸钙)以及PVC型材废角料对型材复合材料性能的影响.结果表明:实验范围内,稀土复合稳定剂为材料冲击性能的主要影响因素,型材废角料是材料拉伸强度的主要影响因素.综合分析得最佳配方:稀土复合热稳定剂5份、CPE 5份、轻质CaCO310份和PVC型材废角料20份.     

中乙烯基聚丁二烯橡胶的研究

以正丁基锂为引发剂，以二乙二醇二甲醚和三异丁基铝（ｉ－Ｂｕ）ｓＡｌ为调节剂，环己烷为溶剂，合成中乙烯基型聚丁二烯橡胶，研究了Ａｌ／Ｌｉ与聚合反应速率及聚合物微观结构的关系，结果表明，随Ａｌ／Ｌｉ的增加，聚合速率下降，而对聚合物的微观结构影响较小，求得了聚合假一级表观增长速率常数ｋｐ，及表观增长活化能Ｅｐ。     

Design of an age hardening Mg-Li alloy and its aging behavior

An effort was made to design an age hardening Mg-Li alloy based on the phase diagrams calculated by means of“THERMO-CALC”-a thermodynamic software. Experiments were carried out to verify the calculated results by melting the alloy and examining its structure and aging behavior. The results show that the alloy possesses a structure constituent as expected, besides,the alloy has apparent aging behavior and over aging happens even at lower temperature. Metastable (Mg, Li, A1, Zn) phase has been identified when the hardness reaches the aging peak. With the increase of the aging time, (Mg, Li, Al, Zn) phase transforms to stable α phase and over aging happens.     

First-principles insight into the entanglements between superionic diffusion and Li/Al antisite in Al-doped Li_(1+x)Al_xGe_(2–x)(PO_4)_3(LAGP)

As an ion conductor, the Al-doped Li_(1+x)Al_xGe_(2–x)(PO_4)_3(LAGP) demonstrates the superionic Li diffusion behavior, however,without the convinced verifications. In this context, the density functional theory(DFT) calculations are employed to clarify the structural origin of the fast Li ion migration kinetics in LAGP solid electrolytes. The calculated results show that doping of Al leads to an emerging high-energy 36 f Li site, which plays an important role in promoting the Li diffusion and can largely lower the Li ion diffusion energy barrier. Moreover, the Li/Al antisite defect is investigated firstly, with which the Li ions are excited to occupy a relatively high energy site in LAGP. The obvious local structural distortion by Li/Al antisite results in the coordination change upon Li diffusion(lattice field distortion), which facilitates the Li diffusion significantly and is probably the main reason to account for the superionic diffusion phenomenon. Therefore, the occupation of Li at high-energy sites should be an effective method to establish the fast Li diffusion, which implies a rewarding avenue to build better Li-ion batteries.     

高岭土掺杂NASICON固体电解质及全固态电池性能

针对LiTi2(PO4)3基固态电解质电导率低的问题,采用浙江三门高岭土矿作为主要原料,以高温固相法制备铝、镁、硅共掺杂钠超离子导体(NASICON)型快离子导体Li1+2x+2yAlxMgyTi2-x-ySixP3-xO12.研究掺杂比例、温度对固态电解质离子电导率的影响.结果表明,组成为Li1.8Al0.1Mg0.3Ti1.6Si0.1P2.9O12固体电解质在423 K时有最高离子电导率7.86×10-4 S·cm-1.以该组成固态电解质为基片,喷雾热解原位制备Al/ Li1+xV3O8/ Li1.8Al0.1Mg0.3Ti1.6Si0.1 P2.9O12 /C全固态电池并在1.8～3.9 V电压区间进行50次充放电测试.该电池具有较好的稳定性及循环容量保持能力.30次循环以后放电容量基本稳定在190～205 mAh·g-1之间,充放电效率大于90%.     

BTA深孔振动钻削断屑分析

切屑顺利排出是BTA深孔加工的至要环节,是直接影响正常生产的关键问题,而断屑问题的解决是良好排屑的前提条件。对振动钻削断屑进行了理论分析;通过实验,探讨了切屑形态变化与切削参数之间的关系,总结出断屑的最佳切削条件。