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《有色金属科学与工程》2017,(6)
在电镀液中添加金刚石微粉,采用复合电镀方法可以制备Ni-金刚石复合镀层,为了研究元素添加对复合镀层工艺的影响,采用电化学方法研究Ni-金刚石复合电沉积机理,分析Co、P元素的加入对复合电沉积过程的影响规律.结果表明:通过循环伏安与动电位极化分析,Co或Co、P的共同加入使得复合电沉积过程中沉积电位正移,说明其可降低阴极表面Ni结晶的驱动力,促进金属的沉积.通过电化学阻抗分析,表明随着Co和P的加入,阴极沉积过程出现2个时间常数,说明阴极沉积反应分2步进行,Co比Ni优先在阴极沉积,并且Ni-Co-P-金刚石复合镀层具有较小的电荷转移电阻,说明Co和P的加入可促进阴极电沉积速率. 相似文献
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探索采用化学镀制备纳米镍颗粒有机复合纤维,经热解脱芯后得到纳米镍颗粒空心纤维的方法,并用SEM,TEM和XRD对其显微形貌和结构进行观测和分析。SEM观测显示,脱芯后得到的金属镍纤维为空心壳层结构,壳层完整且有微孔。XRD和TEM分析结果都表明:空心镍纤维壳层是由面心立方金属镍纳米颗粒构成σs,平均颗粒尺寸约40nm。强磁震动样品磁强仪测量纳米镍颗粒空心纤维的磁性能。为33.80emu·g^-1,He为151 Oe。研究结果表明,采用化学镀制备金属有机复合纤维脱芯,可以获得纳米镍金属颗粒构筑的空心纤维。 相似文献
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本发明涉及一种含有铂族金属的载附的催化剂。所述催化剂可以通过使来自沉积溶液的至少一种铂族金属进行可控无电沉积获得,所述沉积溶液包含:(1)至少一种均匀溶解的铂族金属化合物,(2)还原剂,和(3)至少一种控制剂,选自铌、钽、钼、钨和钒的同多酸和杂多酸或其盐。本发明还步及一种使用通过可控无电沉积制备的催化剂氢化无机或有机化合物的方法,特别是用于直接合成过氧化氢。 相似文献
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电沉积我功能复合材料的研究现状与展望 总被引:3,自引:0,他引:3
综述了国内外在复合电沉积制备多元复合材料方面的进展,重点探讨了耐磨复合材料镀层,自润滑复合材料镀层,电接触功能的复合材料镀层,耐蚀复合材料镀层等的研究现状和发展趋势,结果显示,随着现代科学技术的快速发展,单金属复合镀层难于满足某些特殊需求,而多元复合材料镀层由于具有耐磨,耐蚀和耐高温氧化等优点,在今后的发燕尾服中将得到广泛的应用。 相似文献
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金川镍电解阳极液净化除铜的电沉积法研究 总被引:2,自引:0,他引:2
探讨了采用电沉积法对金川镍电解阳极液进行净化除处理过程。研究表明,净化除铜时,在阴极电位不低于-0.500V(VS.SCE.)、搅抖溶液和常温条件下,用多孔镍作阴极的电沉积法,可使溶液中Cu^2+离子浓度降至2mg/L以下,达到深度净化除铜要求,其产物为99%以上的金属铜粉。 相似文献
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本文综述了多孔铜的多种制备方法,并对氢泡沫模板法进行了深入阐述,讨论了不同电沉积条件对多孔铜形貌的影响规律,并对多孔铜在催化、能源、分析传感等领域的应用现状及发展趋势进行了总结。 相似文献
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V. V. Skorokhod S. M. Solonin V. P. Katashinskii L. L. Kolomiets V. A. Dubok V. A. Zorin A. A. Ivashin N. P. Brodnikovskii Yu. G. Bezymyannyi V. G. Borovik 《Powder Metallurgy and Metal Ceramics》2007,46(7-8):378-384
The deformation behavior of ceramic-metal composites with a bulk-linked metal skeleton made of highly porous cellular nickel
and a stainless wire mesh is examined. It is established that samples of skeletal ceramics remain intact after all types of
destructive tests and show high plasticity and strain and fracture energies. A technique is developed for producing ceramics
with a bulk-linked metal skeleton by filling a highly porous framework with a ceramic powder and subsequent pressing and sintering
of the composite. The technique is tested for two types of skeletal ceramics: structural ceramics such as pyroceramics-highly
porous cellular nickel and bioceramics such as hydroxyapatite-highly porous stainless wire skeleton. The hydroxyapatite-based
composite has lower bending strength and shock bending energy but higher plasticity and nondestructability than the pyroceramics-based
composite.
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Translated from Poroshkovaya Metallurgiya, Vol. 46, No. 7–8 (456), pp. 82–90, 2007. 相似文献
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提高泡沫镍综合技术性能的方法 总被引:1,自引:0,他引:1
通过试验研究了电镀液镍盐浓度、电镀添加剂(润湿剂、整平剂和光亮剂)、阴极电流密度和热处理等因素对泡沫镍力学性能和阴极电流效率的影响,阐明了工艺技术条件对泡沫镍技术性能的影响机理,提出了提高泡沫镍综合技术性能的工艺方法,制得了综合技术性能指标优良的泡沫镍样品。 相似文献
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泡沫金属是一种由金属基体和气孔组成的新型结构功能材料,相对于实体金属材料,泡沫金属材料以牺牲了强度等力学性能为代价,获得了诸如热、声、能量吸收、轻质等优越性能,成为一种新型结构功能材料。泡沫铝是一种在铝基体中形成很多气孔的轻质多孔金属材料,同时兼有金属和气泡特征,它密度小、耐高温、防火性能强、抗腐蚀、隔音降噪、导热率低、电磁屏蔽性高、耐候性强、有过滤能力、渗透性好,具有良好的阻尼特性和电磁屏蔽能力,广泛应用在冶金、化工、航空航天、船舶、电子、汽车制造和建筑业等领域。对泡沫铝制备方法和物理性能的研究有利于提高其性能、扩大其应用领域,本文概述了泡沫铝的制备方法、物理性能及增强泡沫铝基复合材料的研究进展。 相似文献
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AbstractThe fibre space holder (FSH) method combines powder metallurgy and lost-foam casting with the aim of producing novel ultra-thin materials with micro-porous structures. A fabric, used as a spaceholder, is coated with metal powder (stainless steel, copper, nickel or titanium) in a water-soluble polymer binder. During sintering, the spaceholder is removed by a high temperature treatment to obtain the final porous metal sheet. This new material combines the advantages of fabric and porous metal. Its large specific surface area, minimum thickness of <30 μm, maximum porosity of >95% and strong liquid absorbency make it suitable for various application, in particular electrodes in hydrogen fuel cells and medical applications. The metal sheet can be further functionalised by coating with nanopowders. 相似文献
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The infiltration of liquid TRIP steel into a porous zirconium dioxide foam ceramics is a possible production line for a new composite material. This composite is currently under investigation and development in the Collaborative Research Center 799. Coupled numerical simulations of the hot infiltration process at the pore scale are presented in the paper. The results of the simulations are analysed in order to study similarities and differences between heat and fluid flow phenomena during the infiltration of the foam ceramics. Among others, temperature distributions in the liquid steel and the ceramics are evaluated for typical casting conditions in a laboratory‐scale experiment. 相似文献
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实验选取六种不同粒径CrAlY粉末进行复合电沉积Ni-CrAlY镀层制备,研究CrAlY粒径对镀层中CrAlY复合量及复合镀层生长速度的影响。采用化学分析法测试镀层中CrAlY的复合量,初步研究了CrAlY粉末粒径对其复合量的影响规律和机理。结果表明,随着CrAlY粒径的减小,镀层中CrAlY复合量和镀层生长速度明显增加,在CrAlY名义粒径低于500目时均达到最大。分析认为,较大粒径的粉末难以被镍基体包覆完全,从而在搅拌作用下被镀液冲刷,沉积过程相对困难,影响镀层的复合量和生长速度。 相似文献
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Ceramic foam filters are normally used for reducing the velocity of liquid metal in the design of runner systems. In this
study, four designs of the runner system with various orientations of foam filters were explored, and their effect on the
velocity of the melt was estimated by a casting experiment and computational modeling. In the casting experiment, the free-fall
trajectory and metal weighing methods were employed for measuring apparent velocity and flow rate, respectively. Using Forchheimer’s
equation, a porous material such as a foam filter was simulated. The modeling result was validated by the experiment. For
the efficient use of a foam filter in a running system with a high flow rate but low exit velocity, an optimized design is
recommended. 相似文献