共查询到19条相似文献,搜索用时 171 毫秒
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为V—22飞机开发钛铸件 总被引:7,自引:0,他引:7
对钽,铌碳化物工业的发展及生产厂家,中国生产钽,铌碳化物的主要方法,生产的钽,铌碳化物的主要品种和质量标准,钽,铌碳化物的主要应用领域进行了较详细的介绍并展望了中国钽,铌碳化物的发展趋势。 相似文献
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研究了用高分辨率全谱直读等离子体发射光谱仪(ICP-AES)进行钛钽铌合金中钽、铌元素的测定。通过对试样溶样方法的选择,最终采用盐酸+氢氟酸溶解样品;对样品溶解酸度、元素分析谱线选择、背景校正扣除、样品基体及待测元素间干扰等因素进行了分析。采用基体匹配与背景扣除法消除钛基体对待测元素的光谱干扰,选择了最佳实验条件。结果表明:各元素的加标回收率为98.0%~104.0%,相对标准偏差小于2.0%。本法测定已用于钛钽铌产品的检验。 相似文献
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代表中国钽铌工业整体水平的宁夏东方有色金属集团有限公司,近年来,研究了钽粉的微观结构,开发出降低杂质含量,改善物理性能等新技术以及Ta2O5钠还原制取高比容钽粉、TaCl5低温钠还原制取纳米级钽粉的新工艺方法;研制并生产出性能优良的、适用于钽电容器的高比容钽粉,同时也开发了高比容铌粉、一氧化铌粉的制造新技术,制得高性能的电容器级铌粉和一氧化铌粉,为铌电容器作为一种新型电容器产业参与竞争提供了优质的基础材料。 相似文献
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介绍了中国钽铌湿法冶金发展概况与现状及中国钽铌湿法冶金主要感受家和所用工艺流程特点,不叙述了各厂家在产品质量,工艺,设备等方面所取得的技术进步,燕指出今后工作的主要方向,目的在于进一步提高产品质量及利用低品位矿石原料处理回收废水废气,降低物料消耗,改进环境保护。 相似文献
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依据英国金属网公布的2003年、2004年、2005年第1季度美国钽铌原料和制品进口统计数据.评述了美国钽铌市场的状况,着重关注了中国向美国出口钽铌的情况。 相似文献
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从理论和实际应用方面,研究了去除Ta2O5/Nb2O5中杂质S的方法.通过对制取高纯Ta2O5和Nb2O5的中间产品高纯Ta(OH)5/Nb(OH)3进行过氧化处理,改变Ta,Nb,S等元素在物料中的存在方式,增大了含S杂质的溶解性,降低了物料对含S离子的吸附能力及硫酸盐的分解温度,通过洗涤、焙烧达到有效去除产品中杂质元素S的目的.该方法可在不影响Ta2O5/Nb2O5产品质量的情况下,使杂质S降低到0.0001%以下. 相似文献
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SEPARATIONOFTaANDNbBYEXTRACTIONWITHSEC-OCTANOL-HF-H_2SO_4SYSTEM¥ChenHuifang;HeWannian;ZhangYuqi(BeijingGeneralResearchInstilut... 相似文献
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《Intermetallics》2017
Borides have been widely used in cast TiAl alloy for grain refinement and a variety of stoichiometry and crystal structure of borides were reported. Here the effects of alloying elements Nb, Ta, and Mn on the structural stability of fine boride precipitates in TiAl alloys have been studied combining transmission electron microscopy (TEM) and first-principles calculations. The results show that most boride particles have the TiB stoichiometry. In the alloy containing Nb and Mn, all the TiB particles have the B27 structure and are highly enriched with Nb but depleted with Mn. In the alloy containing Nb and Ta, however, the intergrowth of Bf and B27 structure has been observed, and the TiB particles are enriched with both Nb and Ta. First-principles calculations reveal different effects of Nb, Ta, and Mn on the structural stability of TiB polymorphs. Nb stabilizes B27 but destabilizes Bf. Ta strongly stabilizes both B27 and Bf structures. Mn strongly destabilizes both B27 and Bf structures. 相似文献
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以金属氧化物与碳粉作原料,经高能球磨后,采用1850℃放电等离子烧结烧结工艺制备了3种成分的四元高熵碳化物陶瓷(Ti0.25,Nb0.25,Ta0.25,Mo0.25)C、(Ti0.25,Nb0.25,Ta0.25,W0.25)C和(Ti0.25,Nb0.25,Ta0.25,V0.25)C。采用扫描电镜、X射线衍射仪及万能材料试验机等研究了碳化物陶瓷的显微组织、硬度和力学性能。结果表明:3种碳化物陶瓷均为单相FCC结构;含钼陶瓷的晶粒最为细小,气孔也最少;3种陶瓷的实际硬度与采用复合定律计算的理论硬度相一致,即(Ti,Nb,Ta,V)C的硬度最高,(Ti,Nb,Ta,W)C次之,(Ti,Nb,Ta,Mo)C最低。此外,由于其组织未完全致密化且成分不均匀,3种碳化物陶瓷的抗弯强度均低于预期值,有待采取降低烧结升温速率、提高烧结温度等措施来解决这些问题,从而改善陶瓷性能。3种碳化物陶瓷中(Ti,Nb,Ta,W)C陶瓷的综合性能最佳。 相似文献
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A novel β type Ti35Nb2Ta3Zr alloy with low modulus (48 GPa) was fabricated using vacuum consumable arc melting. The corrosion resistance and cytotoxicity of Ti35Nb2Ta3Zr were evaluated. The open circuit potential, electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization methods were used to determine the corrosion resistance. In Ringer's solution, Ti35Nb2Ta3Zr alloy exhibits better corrosion resistance, as compared to that of Ti6Al4V and Ti. The cytotoxicity tests indicate that the biocompatibility of Ti35Nb2Ta3Zr is as good as Ti and Ti6Al4V which are widely used in biomedical fields. Based on corrosion resistance and cytotoxicity, the novel β type Ti35Nb2Ta3Zr alloy can be considered as a potential biomaterial. 相似文献
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用控制烧结工艺制备了均质基体结构与梯度基体结构的WC-(W,Ti)C-(Ta,Nb)C-Co硬质合金,采用化学气相沉积工艺在合金表面涂上TiCN/Al203/TiN涂层,制备成相应的涂层硬质合金及刀片.运用金相观察、扫描电镜分析、三点抗弯强度测试及切削性能测试,研究了梯度基体结构对涂层WC-(W,Ti)C-(Ta,Nb)C-Co硬质合金的组织与力学性能影响.结果表明,采用梯度烧结工艺,可以在合金的表层形成梯度韧性区,该韧性区可以提高裂纹扩展阻力.所制备的梯度基体结构合金的抗弯强度明显超过均质基体结构合金,而相应涂层硬质合金刀片在保持耐磨性能的同时能显著提高抗冲击性能. 相似文献
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通过真空自耗电弧炉开发一种新型β钛合金Ti35Nb2Ta3Zr,其弹性模量仅为48GPa,探讨该合金的耐腐蚀性能和细胞毒性。在Ringer模拟体液中,通过测量开路电位、极化阻抗谱和极化曲线发现Ti35Nb2Ta3Zr的腐蚀性优于Ti6Al4V和Ti。细胞毒性试验证明Ti35Nb2Ta3Zr的生物相容性与目前临床常用的Ti6Al4V和Ti相当。因此,该新型β钛合金Ti35Nb2Ta3Zr具有良好的耐腐蚀性和生物相容性,未来作为生物材料具有广阔前景。 相似文献
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The relative passivity and pitting resistance of pure metals Ta, Nb, Ti, Zr, Cr and A1 in chloride solutions were studied through quasi-stationary potentiokinetic anodic polarization technique. Studies were conducted in both non-aqueous methanolic and aqueous chloride solutions containing 0.4% HC1 with either hydrogen or oxygen saturation, in order to determine the role of water and oxygen in the passivity of these metals. Ta and Nb are passive in all the solutions, Zr and Cr require sufficient water to become passive, Ti needs both water and oxygen for stable passivity while A1 dissolves actively in all the solutions. The pitting resistance of the above metals decreases in the order Ta > Nb > Ti > Cr > Zr > Al. These passive metals are prone to pitting in chloride solutions in the absence of sufficient water which is the essential passivating agent. 相似文献