钛及钛合金箔带材加工成型的影响因素

钛及钛合金是一种性能优异的新型功能结构材料,被誉为第三金属,因而在许多工业领域获得了广泛的应用。本文较详细的介绍了影响钛及钛合金箔带材加工成型的几种因素,包括金属本身的性能、轧制工艺、热处理等。     

退火温度对GH3600合金箔材组织与性能的影响

目的 探究退火温度对GH3600镍基高温合金箔材微观组织及力学性能的影响。为制备综合性能良好的GH3600箔材提供参考。方法 将厚度为2 mm的铸态板材反复轧制退火得到组织均匀的0.3 mm厚度带材,再利用四辊冷轧机将带材轧制成厚度为0.1 mm和0.05 mm的箔材,然后将2种厚度箔材在950、1 000、1 050 ℃下保温1 h后空冷。通过金相观察、电子探针、EBSD检测及XRD分析来研究箔材的微观组织演变。通过拉伸实验检测箔材的室温拉伸性能。结果 随着变形程度的增大,轧制态箔材晶粒沿轧制方向被拉长得更加明显。在相同热处理参数下,0.05 mm退火态箔材晶粒尺寸更小。退火后,箔材晶粒发生了回复再结晶并析出了细小的碳化物。随着退火温度的升高,晶内碳化物逐渐减少,孪晶界比例增大,再结晶程度及晶粒尺寸增大。0.05 mm箔材在1 050 ℃退火时,其晶粒迅速粗化,在厚度方向上出现单层晶,导致箔材的抗拉强度及延伸率出现异常降低的现象,即“越小越弱”的尺寸效应。结论 适宜的热处理工艺有助于改善箔材的微观组织,进而提高其力学性能。0.05 mm箔材在950 ℃下退火1 h时,其延伸率为19.1%,屈服强度以及抗拉强度分别达到293 MPa和560 MPa,综合力学性能良好。     

中间层锌箔对铝-钛异种接头微观组织和力学性能的影响

本文旨在通过改善焊接工艺,提高铝-钛接头性能,扩大铝-钛复合件的应用范围.通过在铝-钛熔钎焊接工艺中添加锌箔,探讨了中间层锌箔对铝-钛接头微观组织和力学性能的影响.采用TIG焊机对铝/钛异种金属板材进行熔钎焊接实验,利用金相显微镜、扫描电镜、能谱仪、维氏硬度计和电子拉伸机对铝/钛接头的微观组织和机械性能进行分析.研究发...     

钛基钎料的活性及理化性能对比研究

对两种钛基钎料非晶态箔带的氧化行为、钎焊接头性能及非晶箔带成型性能等方面进行对比研究 .研究结果对钛基钎料的选择与成分设计有一定帮助 .     

包装世界中的几种高新材料

1.金属箔材及异型材 由于薄化技术的发展,金属箔材种类大大增加,主要品种有金箔、铜箔、铝箔、不锈钢箔、铝箔、钛箔、铜箔、Be箔、Pd箔、Ta箔、Ni箔、Ag箔、Ph箔、Zn箔、铁箔以及Ni—CR等各种合金箔材。金属箔材的发展方向有三种:超长、超级薄、超级极薄;多孔穴化;复合化。     

SiC纤维增强钛基复合材料界面研究及构件研制

首先介绍了作者近年来在SiC纤维增强钛基复合材料界面反应机理、应力分布和界面调控方面的工作进展,然后介绍了作者在磁控溅射法和箔-纤维-箔法复合材料工艺及构件研制方面的研究工作。     

磷青铜板的张力退火

1.前言精密弹簧用的板料,当用自动切割机从成卷的带材上剪成小片,同时进行塑性成形时,要求这种带材开卷后有很好的平整度。像这种平整度好的成卷带材可以通过如图1所示的那种工艺得到。即在带材上加以张力,使它保持完全平直,边进行退火,边引出炉外,冷却至室温,然后重新卷取而获得。本报告将这操作起名为“张力退火。”下面叙述的是有关精密弹簧用铜合金板中具有代表性的磷青铜板进行张力退火的实验情况。     

国产第二代φ6.5/φ55×130mm20辊轧机安装调试简介

一、前言极薄带材在现代电子工业中占有极为重要的地位,其特点是性能好、精度高,凶此能满足高速电子计算机、仪器仪表高精度及小型化的要求。如:高速电子计算机需0.003～0.005mm厚的软磁合金带制作储存器铁芯,应变仪需0.001～0.003mm厚的电阻合金带制作微型应变片,1/10000至1/100000的平面电阻需0.002～0.003mm厚的电阻合金带,录音、录像机需0.002～0.003mm厚的铍青铜、钛箔以制作磁头间隙固定片等。     

基于ZnO纳米片多级结构的柔性染料敏化太阳能电池的制备

采用水热合成法制备基于钛箔的ZnO纳米片薄膜, 采用化学浴沉积法在ZnO纳米片薄膜表面原位沉积ZnO纳米粒和微球, 制备了ZnO纳米片/纳米粒/微球复合结构薄膜, 并将膜组装成柔性染料敏化太阳能电池。研究了钛箔预处理方式、化学浴沉积工艺对ZnO薄膜和电池性能的影响。采用X射线衍射仪、透射电子显微镜和扫描电子显微镜对钛箔和ZnO薄膜的物相组成和形貌进行表征, 采用太阳光模拟器和数字源表测试了电池的J-V光电性能曲线, 通过电化学阻抗谱分析了电池内部电子传输情况。研究结果表明: 当钛箔基底采用酸抛光处理, 将所得ZnO纳米片膜用已经预热24 h的0.15 mol/L二水乙酸锌甲醇溶液改性5 h, 所得电池光电性能最好, 其短路电流密度、开路电压、填充因子和光电转化率分别为11.26 mA/cm², 0.67 V, 0.60和4.51%。     

超声波振动对钛箔拉伸性能及位错分布的影响

以研究超声波振动条件下钛箔的塑性变形特征和位错分布为目的,通过超声波辅助单向拉伸实验和微观组织分析研究不同超声波振动施加方式对钛箔塑性拉伸变形过程中的应力-应变、伸长率及位错分布的影响规律。结果表明:超声波振动过程中钛箔的流动应力最大降幅可以达到约80%,材料的伸长率从未施加超声时的40.33%最大增加至54.46%。通过TEM可以发现超声波振动条件下位错呈现平行分布的趋势且无大量缠结出现,而未施加超声拉伸的试样中位错的分布则显得杂乱无章且缠结严重。     

常规热连轧超薄带钢生产技术研究

厚度小于1.5mm的超薄规格热轧产品可以实现"以热带冷",具有巨大的经济效益。常规热连轧超薄带钢生产技术一直是热轧生产技术研究的重点。全面分析了常规热连轧超薄规格带钢生产时的技术难点,针对该难点,通过研究和实践,总结出一整套超薄规格带钢生产技术,包括板形控制、精轧跑偏控制、全线带钢温度控制、辊道飞飘控制、轧制润滑技术、活套控制、设备精度维护、铁素体区轧制技术等。     

我国钛及钛合金板带材标准体系综述

介绍了我国现行有效的钛及钛合金板带材的国标和国军标,分析了各标准的特点、性能指标、异同点,提出了进一步完善和发展我国钛板带材标准体系的建议。     

Advances in the fabrication of titanium based composites

Titanium alloy metal matrix composites reinforced with silicon carbide fibre are being evaluated for a range of highly loaded aerospace applications. Although expensive, if used selectively they can have a dramatic effect on performance and weight. The SMC has one of the strongest capabilities in Europe for the development and production of titanium fibre reinforced MMCs. Consisting of the DRA Sigma silicon carbide fibre manufacturing facility, producing fibre on a commercial basis, and the manufacture of titanium alloy MMCs in commercial quantities by the foil fibre route, and at pilot scale using the alternative matrix coated fibre route. In the foil fibre route a filament winding and fugitive binder method is used to produce a range of component shapes with excellent fibre distribution and consistent properties. The matrix coated fibre process is seen to have advantages over the alternative methods and is likely to become an important manufacturing route for titanium MMCs, particularly for exotic high temperature titanium alloys and intermetallics, and for shapes such as rings, tubes and shafts. As no titanium MMCs components have yet reached full production, it is unclear which of these fabrication methods will become commercially viable, if any. But, the choice is likely to be based on cost, availability and product quality.     

Novel system (K2TiF6-N2-Ti) to synthesize rod-like TiN nanopowders

ABSTRACT

A direct approach to synthesize rod-like TiN nanopowders by the reaction system (K₂TiF₆-N₂-Ti) is reported in this paper. Within a tube furnace, a solid precursor (K₂TiF₆) is thermally decomposed at 640°C producing TiO₂ (sea-urchin-like rutile microstructures), K₃TiOF₅ (by-product), and fluorine which moves toward a titanium foil by the effect of an N₂ flow synthesizing titanium fluoride species (TiF₄ and TiF₃). The titanium foil is located at different temperatures from 500°C to 900°C. Due to the fact that the quantity of fluorine is limited, the titanium fluoride species eventually become titanium nitrides. The effect of reaction temperature and time was studied and based on an analysis of variance, temperature was found to be the most important factor regarding to the phase composition of TiN nanostructures and also to the real production rate. The highest values of powder production rate (1.29) (the highest possible) and phase concentration (>98% TiN) were found at 800°C. Likewise, the reaction time was the most important factor in regard to obtaining the smallest particles (～16 nm) at 2.5 h.     

表面自组装法制备高比容Al2O3/TiO2复合膜

通过提高工作介质氧化膜的介电常数来增加电容器的比容量, 是解决铝电解电容器小型化、轻量化常用的方法之一。本研究采用表面自组装法, 在铝箔表面引入磺酸基团使铝箔表面的荷电性质发生改变, 铝箔与二氧化钛前驱体胶粒间的静电斥力转变为静电引力, 从而增加了二氧化钛在铝箔表面的沉积量。经过热处理与阳极氧化后, 在铝箔表面形成了高介电常数Al₂O₃/TiO₂复合膜。相对未涂覆TiO₂的阳极铝箔, 采用表面自组装法制备的复合膜表面的钛含量增加了30倍, 其比容量在400 V耐压下提高了44.26%。本方法制备的大比容量阳极氧化铝箔在铝电解电容器行业有巨大的应用潜力。     

Controlled microstructure and production of TiO2 nanostructures by Ar and Ar–H2 atmosphere

Titanium dioxide nanostructures have been synthesised by annealing the Pd loaded titanium foil at 680°C under the atmosphere of Ar or Ar–H₂ gas mixture. The microstructure and production of titanium dioxide are found to depend critically on the concentration of Pd catalyst and the Ar–H₂ atmosphere. The catalyst of Pd and the introduction of 5%H₂ gas are the key factor for the formation of the long (about 100?μm in the average) and smooth titanium dioxide nanowires at low temperature. Scanning electron microscope and X-ray diffraction show that they are all rutile phase. The further result shows that the titanium dioxide nanowires possess good crystallinity and high surface photovoltage response.     

Infrared brazing Ti-6Al-4V and SP-700 alloys using the Ti-20Zr-20Cu-20Ni braze alloy

Great efforts have been made in brazing high-strength α-β titanium alloys below their beta-phase transformation temperature in order to obtain optimized mechanical properties. The brazing temperature of the cold roll-bonded Ti-20Zr-20Cu-20Ni foil is roughly 70 °C lower than that of Ti-15Cu-15Ni filler metal. Moreover, the detrimental Cu-Ni and Cu-Ni-Zr rich Ti phases can be greatly reduced or eliminated by properly choosing the brazing thermal cycle. This research demonstrates the potential application of Ti-20Zr-20Cu-20Ni foil in brazing titanium alloys.     

EB锭焊管用TA2冷轧钛带制备技术研究

TA2薄壁钛焊管具有比强度高、耐腐蚀、生产效率高、换热效果好等优点,被广泛应用于核电、化工、海水淡化等领域。本研究采用短流程、低成本电子束冷床熔炼炉EB扁锭制备焊管用TA2冷轧钛带卷,并对其组织性能进行分析。结果表明:采用EB锭制备的TA2冷轧钛带卷横向强度低、伸长率及表面硬度高,可有效避免焊管弯曲成型过程中表面划伤、磨痕等成型缺陷,满足薄壁焊管使用需求。