摩托车金属连接件ABS轻量化设计与FDM增材制造

针对摩托车金属连接件轻量化需求,对金属连接件进行了两次轻量化优化设计,第一次是在满足连接件使用性能的条件下更改连接件材料,由铝合金更改为丙烯腈-丁二烯-苯乙烯塑料(ABS)塑料,此次更改,实现60%的减重;第二次也是在满足连接件使用性能的基础上采用Altair Inspire软件对其进行拓补优化、几何重构及强度校核,得到适合于3D打印的结构,相对第一次优化后的结构实现79%的减重效果,通过两次轻量化优化设计后连接件相对于原始金属连接件实现了92%的减重,然后通过切片软件设置切片层厚、连接件摆放位置等参数对连接件三维数据进行前处理,最后通过3D打印机实现摩托车连接件FDM快速制造,为摩托车金属零件轻量化设计与制造提供了一种新的思路。     

探索青海察尔汗盐湖老卤资源梯度开发

青海察尔汗盐湖位于青海格尔木柴达木盆地,是目前我国最大的盐湖,其中卤水矿产资源非常丰富,资源总储量在六百亿吨以上。目前察尔汗盐湖周边已经建立了多家大型钾肥生产企业,而提钾后的尾矿即老卤资源非常丰富,老卤中蕴含了大量的钠、镁、锂、硼、溴等各种盐类资源,如果排放不综合回收,不仅造成资源的浪费、也造成环境污染。本文通过对察尔汗盐湖老卤资源进行分析总结,结合资源综合开发,探索老卤资源综合开发方案,梯度提取高强石膏,碳酸锂,溴素和硼酸产品,为盐湖资源的综合利用提供参考。     

环氧树脂灌封器件电镀前处理工艺改进

针对环氧灌封器件表面镀层结合力差的问题,在镀前对环氧树脂灌封体进行喷砂,并将铬酸酐?硫酸体系化学粗化改为等离子粗化.采用改进的前处理工艺后,环氧树脂灌封体表面的镀层厚度、结合力及可靠性均满足宇航型号产品的使用要求.     

Cohesive mechanism of the FeCr/Ni Interface: A first-principles study

Based on previous experimental results, a series of FeCr/Ni interface models have been constructed and analyzed using a first-principles pseudopotential plane-wave method. Several parameters, such as the ideal work of separation (W), formation enthalpy (ΔH), cohesive energy (ΔE), and electronic structure were calculated in order to analyze the bonding performance and adhesion mechanisms of elements along an FeCr/Ni interface. The largest ideal work of separation was obtained for the Fe(100)/Ni(100) interface, which implies that this interface model presented the most stable structure among a series of crystal interface indices, e.g., (100), (110), and (111). With Cr doping, the W of the FeCr(100)/Ni(100) interface was increased by 101.571 mJ/m². The corresponding ΔH and ΔE values also indicated that the FeCr(100)/Ni(100) interface model was strengthened by doping with chromium. Furthermore, the overlap population ratio, R _LBOP (R _LBOP= 1.04), of FeCr(100)/Ni(100) was smaller than that of Fe(100)/Ni(100) (R _LBOP = 1.35), which implies that the toughness of the Fe(100)/Ni(100) interface can be improved by the presence of chromium impurities. Moreover, electronic structure analysis provided an understanding of the mechanical performance of the various Fe(Cr)/Ni interface models. Thus, our findings open a potential avenue for the comprehensive study of composite material designs.     

Phases and microstructures of high Zn-containing Al–Zn–Mg–Cu alloys

Phases and microstructures of three high Zncontaining Al–Zn–Mg–Cu alloys were investigated by means of thermodynamic calculation method, optica microscopy(OM), scanning electron microscopy(SEM)energy dispersive spectroscopy(EDS), X-ray diffraction(XRD), and differential scanning calorimetry(DSC) analysis. The results indicate that similar dendritic network morphologies are found in these three Al–Zn–Mg–Cu alloys. The as-cast 7056 aluminum alloy consists of aluminum solid solution, coarse Al/Mg(Cu, Zn, Al)_2 eutectic phases, and fine intermetallic compounds g(MgZn_2). Both of as-cast 7095 and 7136 aluminum alloys involve a(Al)eutectic Al/Mg(Cu, Zn, Al)_2, intermetallic g(MgZn_2), and h(Al_2Cu). During homogenization at 450 °C, fine g(MgZn_2) can dissolve into matrix absolutely. After homogenization at 450 °C for 24 h, Mg(Cu, Zn, Al)_2 phase in 7136 alloy transforms into S(Al_2Cu Mg) while no change is found in 7056 and 7095 alloys. The thermodynamic calculation can be used to predict the phases in high Zncontaining Al–Zn–Mg–Cu alloys.     

Selectivity recovery of molybdenum(VI) from rhenium(VII) by amine-modified persimmon waste

Amine functional group was grafted to obtain modified persimmon waste gel(NH_2–CPT) with the focus of development of selective recovery of molybdenum from rhenium. The adsorption behavior of the NH_2–CPT gel for various metal ions at varying hydrochloric acid concentrations was studied. It is found that the NH_2–CPT exhibits high affinity for Mo(VI) and no affinity for Re(VII), Cu(II),Fe(III), Mn(VII), and Zn(II) under the operating conditions. The maximum adsorption capacity for Mo(VI) is 172 mgág-1, and the adsorption behavior obeys the Langmuir model. Owing to Mo(VI) as poly-anions, the adsorption mechanism of molybdenum anions could be explained as the anion exchange reactions at weak acid concentration, while neutral molecules could be explained as the complexation reactions at strong acid concentration,respectively. In addition, its excellent adsorption characteristics for Mo(VI) are confirmed by separation of Mo(VI)from Mo to Re containing industrial effluent.     

In situ two-step electrochemical preparation of fluoride-free nickel-based compound film on nickel plate for supercapacitors

A nickel-based compound layer was prepared on a nickel plate by anodization in a 75 wt% H_3PO_4 solution containing NH_4F. This layer was then treated by galvanostatic charge/discharge(GCD) until a black outer layer was detached, leaving behind a film on the nickel plate as a binder-free electrode material for supercapacitors. The microstructural characterization shows that the film consists of Ni(OH)_2and NiO, and no fluoride is found in the as-obtained film. Electrochemical tests demonstrate that this fluoride-free film electrode exhibits a high capacitance of 954 F g~(-1)at 7.5 Ag~(-1), excellent rate capability(a 19.5 % capacitance reduction with the current density increasing to 120 Ag~(-1)) and cycling stability.Within 3500 cycles, the specific capacitance does not decrease, but rather increases from 840 Fg~(-1)to approximately 1092 Fg~(-1)in the first 100 cycles at 60 Ag~(-1), and remains stable until the aforementioned layer is detached.     

基于LabVIEW的GMAW短路过渡电信号周期参数提取

传统的参数提取是使用汉诺威分析仪或其二次开发,在LabVIEW中,先前的提取方法操作不便且易受噪声影响而出错,文中根据LabVIEW脉冲测量函数,以电压短路结束为中心,在对应的电流波形的一定范围内查询最大值是否小于阈值为标准,判定是否为瞬时短路,将测量函数制作成子vi;为改善程序结构提高人机交互性,使用JKI状态机,以U-PDD,I-PDD为辅助,设计简洁的人机交互界面,选择合适的参考电平和阈值电流,测量得出短路时间、短路周期时间变化图、频次图及其变异系数。试验表明此方法可以准确的测量所需要的结果。     

非对称断面钢轨局部镦粗技术开发与应用

为解决非对称断面钢轨镦粗时的波浪变形问题,设计了局部镦粗成套装置,利用已有的锻造生产线,有效地控制了非对称断面钢轨镦粗时产生的失稳和轨肢波浪变形,减少了模具更换次数;同时,设计的镦粗测量和显示装置,可精确控制镦粗量,保证镦粗成形质量稳定。经实物验证,采用本装置及工艺,单根镦粗时间由原工艺的60 min降低至8 min,效率提高了7倍以上;镦粗钢轨一次合格率达100%,较原工艺合格率提高了3倍以上。利用已有的锻造生产线,减少了设备投入,降低了投资成本,在工艺布局上可以减少镦粗工序的生产区域,优化了车间的工艺布局。最后,通过实物验证了方案可行性,并确定了工艺参数,可用于指导实际生产。     

大口径厚规格X80管线钢的低温断裂控制

以大口径(OD1422 mm)、大壁厚(38.5 mm)X80级管线钢热轧板为研究对象,采用光学显微镜和扫描电镜对其显微组织和-20℃低温落锤撕裂试验断口形貌进行分析,研究了断裂与组织之间的关系.结果表明,带状组织和不同厚度位置晶粒度大小不均,粒状贝氏体、退化珠光体、准多边形铁素体和马奥岛等混合组织会导致裂纹的萌生和扩...