钛型材复合静液挤压试验

由于钛的高比强度和优异的耐腐蚀性能,使其在许多特殊场合得到广泛应用。图1是眼镜合页截面图,合页由纯钛制成。由于截面形状的不规则性,类似眼镜合页这样截面形状复杂的异形型材,用传统的挤压加工会带来诸如成形困难、变形不均匀、不易制模等困难。     

钛铜复合棒及其标准化

概述了钛铜复合棒研制开发及发展历程,并介绍了钛铜复合棒的主要性能,以及钛铜复合棒的标准化情况。     

钛铜复合棒型辊矫直工艺研究

钛铜复合棒作为制碱电解槽的新型电极材料，以其优良的耐蚀性和导电性迅速替代了传统的石墨电极．其主要规格为φ32mm×H14mm宫灯形、27mm×27mm方形两种．钛铜复合棒的主要生产工序之一──矫直，以前多采用张力矫直方法．此方法具有材料损失大（需消耗夹头）、易产生小尺（缩径）废品、矫直效果差、操作困难、不易掌握等缺点．为了减少原材料消耗，降低废品率，提高棒材平直反，必须寻找一种新的矫直方法．悬臂型材辑式矫直机具有成型的装配式矫直辑，每个辑于有方形、宫灯形孔槽，正适用于矫直宫灯形、方形复合椴材，该机由于辊数多，矫…     

爆炸复合钛／铜复合棒的孔型轧制

试验了爆炸复合Ti／Cu复合棒坯孔型轧制制备矩形阳极导电棒的工艺过程。试验通过不同的箱形孔型系统及道次加工率设计，试制同形状精度、尺寸精度与工艺性能均满足技术要求的电极材料。确定的工艺流程满足工业生产的需要。     

铜-钛爆炸复合板的轧制

本文叙述铜-钛复合板的爆炸焊接和后续轧制工艺、它的组织和性能,简述了这种复合材料可能应用的领域,指出了爆炸焊接和轧制等常规压力加工工艺的联合是生产各种各样金属复合材料的一个有效途径。     

钛-铜扩散界面及其导电性分析

通过热压扩散复合制备钛-铜复合板,研究了温度对复合界面形貌的影响.SEM分析表明扩散界面由Cu4Ti、Cu4Ti3、CuTi、CuTi2化合物相组成,同时存在2个不同衬度的Cu4Ti相层.复合板的导电性得到大幅提高,是纯钛的13.2～15.7倍.     

钛-铜复合棒的主要生产方法及其基本特点

重点介绍了拉伸法、挤压或挤压 拉伸法、爆炸或爆炸 轧制法等钛铜复合棒材的生产方法及其基本特点。并分析了生产方法对产品质量的影响。     

钼-铜／钨-铜复合粉末、其制备方法和应用

本发明涉及一种通过含金属-复合粉末、粘合剂和任选的陶瓷组分的体系经粉末注塑而制备金属和金属-陶瓷复合部件的方法，其中将所用的金属-复合粉末与粘合剂混合并在惰性气氛中与保护液体混合。本发明还涉及钼-铜复合粉末和钨-铜复合粉末，该粉末的一次颗粒的粒度基本上〈2μm，其氧含量〈0．8％（质量分数），并任选含陶瓷组分，     

日本电线铜回收利用现状

日本电线铜回收利用现状电线铜回收与消费日本是废旧铜消费大国之一。据日本通产省资源统计年报资料，１９９１年度包括铜加工企业自消铜合金废屑在内的废旧铜消费总量达到１２７万吨，占铜消费总量（２９６．８万吨）的４３％，而且其比率近几年一直处于上升趋势。在废旧...     

钛铜复合棒的生产及其应用

钛铜复合棒是用来制作金属阳极电解槽钛阳极的重要构件,自60年代末金属阳极电解槽问世以来.它已被世界上许多国家广泛采用.目前,在我国氯碱生产中它亦起主导作用.以1993年氯碱生产总产量为例,其中以金属阳极电解槽生产的氯碱占总产量的65%以上,因此,钛铜复合棒的开发与研制有着十分重要的意义.     

连续挤压—拉拔工艺生产铜母线过程中的质量控制

近年来国内的铜母线生产由传统的铸锭——横列式轧机或卧式挤压机生产坯料再经拉拔的工艺向生产工序短、成材率高、能耗低、生产成本低、环境好的连续挤压——拉拔工艺转变,铜母线在生产过程中主要容易出的质量问题有表面质量、裂边、弯曲/扭曲、尺寸公差、性能指标达不到要求,下面就连续挤压——拉拔生产工艺,结合本人多年的工作经验,对铜母线生产过程中的质量问题进行剖析,供同行们在工作中参考。     

连续挤压铜排缺陷的分析及解决措施

本文对连续挤压铜排缺陷进行了研究,找出其产生原因,并提出了具体的解决措施。     

浅谈连续挤压铜母线、异型铜排的各种缺陷

本文介绍了挤压铜母线、异型铜排的各种缺陷和预防措施     

BT25钛合金棒材的组织和性能研究

依据BT25钛合金材料的特性,编制相应的试生产工艺,制备出Ф200mm的较大棒材和西20mm的较小棒材。测得的两类棒材的性能都满足了标准要求。在实验条件相同的情况下,轧制的小棒材并没有因为变行量增大而使性能得到极大提高,两者的性能差别不大,而且,两种规格棒材的显微组织都为等轴组织。     

某特殊需求的大规格TC4钛合金棒材制备工艺研究

为给某特殊锻件提供满足缺口应力断裂性能的大规格TC4钛合金棒材,将3次真空自耗熔炼得到的5 t重的Ф720 mm TC4钛合金铸锭,分别采用β相区开坯+两相区直拔锻造和β相区开坯+两相区锻造(镦拔+直拔)两种工艺,制成Ф350 mm TC4钛合金棒材。第二种工艺制备的锻棒组织的均匀性及等轴化程度、超声波探伤水平均优于第一种工艺制备的棒材;普通退火处理后棒材的室温塑性和缺口应力断裂性能也较好;各项技术指标均符合标准要求。     

Chromium Recycling from Argon-oxygen Decarburization Dust in Hot Metal Pre-dephosphorization Process

The chromium recycling from the stainless steel dust of an argon-oxygen decarburization (AOD)furnace during a hot metal pretreatment process was investigated.Experiments at different temperatures or with different amounts of AOD dusts were carried out in a laboratory furnace equipped with MoSi2 heating elements and subsequently industri-al experiments were conducted in a stainless steelmaking factory,in order to study the thermodynamic mechanism of C and Si reacted with Cr2 O3 to get Cr from AOD dust.The results showed that the reaction between C and Cr2 O3 occurred below 1 572.18 K.Although its reducing ability was weaker than that of Si,C enabled the Cr in Cr2 O3 in the AOD dust to be recycled using the Si in the slag.By combining the AOD dust added in an earlier stage,the hot metal pretreatment slag added in a later stage could not only recycle Cr from AOD dust but also remove Si,S,and P.Higher hot metal temperatures resulted in higher Cr content and lower remained P concentration in the molten iron.     

Development of Slag Recycling Process in Hot Metal Desulfurization with Mechanical Stirring

In order to develop an environment‐friendly steelmaking process, a slag recycling process for hot metal desulfurization by mechanical stirring was designed. The process was developed with 70 kg‐scale hot metal experiments and actual plant tests. The recycled slag has a 70% desulfurization ability compared with that of virgin flux (CaO‐5%CaF₂). The lower efficiency of the recycled slag was caused by SiO₂ contamination carried over from the previous process. There is no particular size requirement for the recycled slag, as the effect of the recycled slag size on the desulfurization ability is small. The ratio of CaO in the recycled slag to total CaO should be less than 60% in order to prevent an increase in the amount of slag. Slag recycling operation can be repeated more than twice when the optimum conditions are applied. The slag recycling process was established in an industrial operation, and consumption of desulfurization flux decreased by 40% with the process compared with that without slag recycling. Slag hot recycling was adopted at another plant where consumption of desulfurization flux decreased by 50% compared to operation without slag recycling. The positive effect of hot slag recycling is estimated to be a result of the temperature of the recycled slag.     

The Study on the Microstructure and Mechanical Properties of 400MPa Grade Bar Prepared by Controlled Cooling After Finish Rolling

The production process of bars in Baosteel Nantong Co.Ltd.was adjusted by both decreasing heating temperature and adding controlling cooling procedure after finish rolling for upgrade of bars.A set of water cooling system was also installed behind the finishing mill.On-line tests were conducted,and then the microstructure and mechanical properties of the bars with HRB335 composition and φ22mm diameter were studied.The results showed that the microstructures of the bar cooled by water were ferrite and pearlite with grain sizes of 8.5 to 12 grades,which were finer than that of the bar without water cooling.While the thin outer layer microstructures of the bar cooled by water were mainly tempered sorbite with small amount of tempered troosite.The average yield strength R eL and tensile strength R m of the bars with water cooling increased 105MPa and 73MPa respectively compared with those of the bars without water cooling.The reason of this strengthening was attributed to the synthetic role of fine grains and phase transformation and precipitation mechanism.In addition,The ration of R m /R eL could be higher than 1.25,which is the request of earthquake-proof performance for HRB400E,only when the self-tempering temperatures of the bars were higher than 640℃.     

通电加热氧化金属钛制备TiO2薄膜及其光催化活性

应用在空气中电加热氧化的方法在金属钛表面制备了TiO2薄膜并通过XRD, SEM 以及UV方法分别研究了其晶相结构、表面形貌及光催化活性。控制流过金属钛的电流密度,可以在表面形成TiO2薄膜。SEM和XRD测试表明形成的TiO2为线条状的金红石晶型的均一薄膜。光催化测试表明,电氧化TiO2薄膜具有良好的光催化活性,分解亚甲基蓝的速率常数为(4.2~5.8)×10-3 min-1。