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《新材料产业》2007,(12):90-90
钛金属具有质量密度小、强度高的特点,采用粉末冶金技术可望明显降低钛金属制品的成本。降低钛金属粉的生产成本,可以增加金属钛制品的应用范围,使金属钛的应用不再仅限于航空、化学等少数领域,为此杜邦公司已与霍尼维尔电子材料公司合作探索低成本生产高纯度钛金属粉的工艺。同期杜邦公司与MER有限公司达成协议利用美国高级国防项目研究机构(DARPA)的570万美元资助合作开发一种廉价、节能的生产钛金属粉的工艺。根据协议杜邦公司将提供二氧化钛作为原材料,并参加设计开发工作,MER有限公司提供从二氧化钛转化金属钛的核心技术,建立和完善大规模生产所需的设施。杜邦公司将利用新工艺制作的钛金属粉制造一些粉末冶金零件制品,验证新工艺制作的钛金属粉的质量。 相似文献
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辅助阳极是电子防腐蚀系统的关键部件之一,为提高其性能及寿命,利用热分解法制备了Ru-Ir-Sn-Ti混合氧化物涂层钛基阳极,用SEM,XRD,动电位极化曲线、强化电解寿命试验和热水器内胆电子防腐蚀试验考察了不同Sn含量的混合氧化物涂层钛电极的性能。结果表明:Ru-Ir-Sn-Ti混合氧化物涂层覆盖良好,呈均匀龟裂状;添加适量的Sn能提高涂层的电化学活性,含10%(摩尔分数)Sn涂层的电化学性能最优;含30%(摩尔分数)Sn涂层的强化电解寿命达58 h;混合氧化物涂层钛阳极在输入很小的电压时,能有效防止水下搪瓷碳钢在高硬度热水中的腐蚀,且能使阴极材料表面沉淀一层钙质层,增强了保护效果。 相似文献
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2005年11月3日,攀钢(集团)公司和北京科技大学正式签署"金属钛新型提取技术(ZJG法)"合作合同,标志ZJG法电解制取金属钛正式开始进入产业化进程. 相似文献
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社会上有一种倾向,尽量少用碳以防止其对气候变化的负作用。工业部门和交通运输部门是碳排放的大户。固体氧化物隔膜(SOM)工艺有希望用作镁、钛等氧化物电解制取金属的一种工艺,不但成本低,而且比现行工艺有较少的碳需求。 相似文献
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R B Subramanyam 《Bulletin of Materials Science》1993,16(6):433-451
Titanium and its alloys have emerged as cost-effective structural materials in many spheres of chemical and engineering industries
including aerospace and power generation. Titanium in its pure form is invariably prepared starting from pure titanium tetrachloride.
Titanium tetrachloride obtained by chlorination of the oxide mineral is purified and reduced with either liquid magnesium
or sodium or electrolysed to obtain titanium in sponge form. The metal extraction processes are so complex that large scale
production technology is limited so far only to a few countries in the world viz. the USA, Japan, CIS, UK and China. India
is attempting to enter this arena shortly with a 1000 TPY commercial plant based entirely on home-grown technology.
Among the extraction methods, the magnesium reduction of titanium tetrachloride, patented by W J Kroll in 1940, has received
wider attention because of the inherent and relative merits of the process and its viability for economic production on an
industrial scale. The original Kroll process, however, has undergone several modifications in the past few decades. The recent
technological breakthroughs in the Kroll process as well as in the magnesium recycling technology has resulted in a significant
reduction in the production cost of the metal. The paper describes these important innovations and also the efforts that are
being put in for the establishment of a commercial plant for metal production in India based on indigenously developed technology. 相似文献
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钛及其合金作为21世纪重要的结构材料,具有抗腐蚀、熔点高、密度小、比强度高、无磁性及生物相容性等优点,但表面硬度低、耐磨性差、摩擦系数大,严重限制了其应用范围.熔盐电解法渗硼作为一种金属表面改性技术,具有成本低廉、效果明显等优点,可有效提高钛及其合金的表面硬度和耐磨性.综述了熔盐电解法渗硼的研究现状,从渗硼的工艺参数、机理、热力学和动力学方面进行了分析.综合双相硼化物(TiB和TiB2)渗层的生长动力学的研究结论,可以看出渗硼问题的核心就是活性B原子在固相的扩散,因此研究近相变温度下B原子的扩散行为对渗硼过程尤为重要. 相似文献
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钛合金以其优异的生物相容性、出色的力学性能和抗腐蚀性而广泛应用于航空航天等领域。然而,现代工艺制备的钛合金存在延展性和耐疲劳性较差的问题,同时钛金属本身的耐磨性也较差,因此需要通过合适的后处理工艺来改善其力学性能。在这种背景下,深冷处理凭借其便捷、无污染、低成本及能显著改善金属材料组织和综合性能等优势,成为机械加工领域备受瞩目的研究方向。首先简要介绍了深冷处理的发展历程以及2种主要加工方法:液态法和气态法,同时概括了气态法的具体流程。其次重点综述了国内外深冷处理工艺对钛合金组织和织构的影响,分别从深冷时间、深冷温度与循环次数3个方面,归纳了深冷处理工艺对钛合金硬度和拉伸性能的影响以及深冷工艺的作用机理,并进一步探究了深冷处理工艺对钛合金制件摩擦磨损性能和耐疲劳性能的影响规律。最后介绍了深冷处理复合工艺方法,为基于深冷处理的加工工艺的发展提供有益参考和启示。 相似文献
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Titanium for aerospace: Rationale and applications 总被引:1,自引:0,他引:1
R. R. Boyer 《Advanced Performance Materials》1995,2(4):349-368
Titanium and titanium alloys are excellent candidates for aerospace applications due to their high strength to weight ratio and excellent corrosion resistance; titanium and its alloys are immune to almost every medium to which they would be exposed in an aerospace environment. Titanium usage is, however, strongly limited by its higher cost relative to competing materials, primarily aluminum alloys and steels. Hence the advantages to using titanium must be balanced against its added cost. The titanium alloys used for aerospace applications, some of the characteristics of these alloys, the rationale for utilizing them, and some specific applications of different types of actual usage will be discussed herein.This is an extension of References 1 and 2, which reviewed applicaiions of alloys. These references will provide more details on applications of the alloys, while the and / alloys are added herein. 相似文献
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《Materials at High Temperatures》2013,30(4):607-629
AbstractOrthorhombic titanium aluminides offer the potential to substitute the current titanium alloys in aero engines, gas turbines and automotive turbo-chargers. The advantages are a wider range of thermo mechanical processing possibilities, a higher room temperature ductility, increased high temperature strength and better oxidation as well as titanium fire resistance. Nevertheless, uncertainties with regard to their oxidation behaviour presently impede their use in practical applications. In the present study a very detailed investigation of the oxide scales formed and of the resulting metal subsurface structures after oxidation for up to 1000 h was performed. The results show that both the oxide scale and the subsurface zone develop very complex structures which are responsible whether protective or non-protective behaviour is observed. In principle the oxidation behaviour of the three alloys investigated can be characterised by three types designated as type I, II or III. Each of these types has a characteristic scale structure and a different degree of protection and their occurrence depends on alloy composition and oxidation time. From a technical point of view the interstitial dissolution of oxygen in the metal subsurface zone plays an important role as this process can lead to severe embrittlement. The extent of the IAZ (interstitial affected zone) depends on the oxide scale structure. The paper presents the results from detailed metallographic and microprobe investigations which throw further light on the complex oxidation processes of this group of materials. 相似文献
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低成本钛合金研究现状与发展趋势 总被引:1,自引:0,他引:1
钛合金较高的成本限制了其应用范围,低成本钛合金已成为当前钛合金研究的热点。概述了低成本钛合金国内外的研究现状,着重介绍了宝钛集团研发的低成本钛合金及钛合金的低成本化制备情况,新近研制的BTi31、Ti-3111、BTi-341、BTi-421111、BTi-61111S等低成本钛合金已在汽车、体育休闲等领域获得应用;在钛合金的低成本化制造方面,利用电子束冷床炉熔炼,大量添加返回料,熔炼的扁锭直接轧制板材,显著降低原料成本和加工成本。同时对低成本钛合金的发展方向进行展望,指出今后的研究重点是进一步优化熔炼和加工工艺,提升合金性能水平,提高成材率,拓展应用范围。 相似文献