Abrasive-Assisted Electroforming of Nickel on Translational Cathode

2013 ◽  
Vol 770 ◽  
pp. 145-149 ◽  
Author(s):  
Zeng Wei Zhu ◽  
Dong Wang ◽  
Jian Hua Ren
Keyword(s):  
Mechanical Properties ◽  
Current Density ◽  
Traditional Method ◽  
Coarse Structure ◽  
Electroforming Process ◽  
Nickel Deposits ◽  
Nickel Electroforming

Spherical abrasives were employed to polish the growing deposited layer during nickel electroforming process. On a translational flat cathode, nickel deposits with distinct polishing mark were obtained. It was found that the abrasive polishing can help to improve the microstructure and increase the mechanical properties of the nickel deposits. Compared with the deposits prepared with traditional method, the microstructure became more homogeneous and the microhardness increased nearly two times. The increase of current density led to coarse structure and lower microhardness.

Microstructure and Property of Nickel Electroformed Using Rotating Cathode in Hard Particles

2006 ◽  
Vol 315-316 ◽  
pp. 686-690
Author(s):  
Z.W. Zhu ◽  
Di Zhu
Keyword(s):  
Surface Morphology ◽  
Current Density ◽  
Traditional Method ◽  
Xrd Analysis ◽  
Novel Technique ◽  
Hard Particles ◽  
Nickel Deposits ◽  
Current Densities ◽  
And Performance ◽  
Microstructure And Performance

Nickel deposits were electroformed by a novel technique, in which the mandrel rotated in hard particles (such as ceramic beads) filling between the electrodes. The microstructure and microhardness of the deposit were studied by means of SEM, XRD analysis in contrast with the traditional method. The effects of current densities on the surface morphology and microhardness of the deposit were also studied. The results showed that the polishing, impacting and disturbing of hard particles during electrodepositing could affect the microstructure and performance of the deposits. The grains were substantially refined, the preferred orientation of (200) face weakened and the microhardness significantly increased. Moreover, the presented technique could use higher current density and produce bright and smooth deposits.

Effect of the Thickness Uniformity in Micro-Electroforming Process by Dividing Conductive Zone on Cathode

2009 ◽  
Vol 60-61 ◽  
pp. 202-206
Author(s):  
Li Qun Du ◽  
Li Chuan Yu ◽  
Lei Song ◽  
Chong Liu
Keyword(s):  
Theoretical Analysis ◽  
Current Density ◽  
Thickness Ratio ◽  
Experimental Results ◽  
Thickness Uniformity ◽  
Conductive Zone ◽  
Electroforming Process ◽  
Nickel Electroforming

In this paper, an effective method is presented to improve thickness uniformity in nickel electroforming process. In most electroforming processes, thickness ratio of edge to center is 2.5~4 and the shape of the electroforming zone is naturally a concave. Dividing conductive zone of electroforming structure to redistribute current density was applied to improve electroforming uniformity. Theoretical analysis and experimental results verify that a proper dividing method can improve the electroforming uniformity effectively. In the experiment, the thickness ratio of edge to center decreases from 2.91 to 1.88.

Influence of ion treatment modes on the physical and mechanical properties of zirconia ceramics

2020 ◽  
Vol 10 ◽  
pp. 5-18
Author(s):  
S. А. Ghyngаzоv ◽  
◽  
V. А. Коstеnко ◽  
A. K. Khassenov ◽  
◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Current Density ◽  
Ion Beam ◽  
Physical And Mechanical Properties ◽  
Oxygen Stoichiometry ◽  
Continuous Mode ◽  
Zirconia Ceramics ◽  
Surface Layers ◽  
Near Surface ◽  
Ion Treatment

The article considers the influence of the treatment modes by N2+ and Ar+ ions beams on the physical and mechanical properties of zirconia ceramics. Surface modification of zirconia ceramics was performed using two modes of ion treatment — pulsed and continuous. The pulse mode of treatment by N2+ ions was realized at an accelerating voltage of 250 – 300 kV, current density j = 150 – 200 A/cm2, and energy density W = (3.5 and 5) ± 5 % J/cm2. The continuous mode of treatment by Ar+ ions was realized at an accelerating voltage of 30 kV and an ion current density of 300 and 500 μA/cm2. The fluence of the Ar+ ion beam varied from 1016 to 1018 cm–2. It is established that the pulsed mode of ion treatment leads to the melting and recrystallization of the surface of ceramics. It is shown that this treatment leads to a violation of the oxygen stoichiometry in ceramics and, as a result, there is an appearance of electrical conductivity in the near-surface layers, the layers of zirconia ceramics become conductive. It was established that the continuous mode of ion treatment does not lead to the melting and recrystallization of the ceramics surface, but is accompanied by its slight etching. It is shown that under the action of continuous ion treatment, microhardness increases (by 14 %). Hardening of the surface layers of ceramics is observed at a depth that exceeds the average projected range of Ar+ ion by 103 times.

Calculation of Cross Beam in Continuous Box Girder Bridge Based on Modified Shear Method

2014 ◽  
Vol 578-579 ◽  
pp. 642-647
Author(s):  
Ya Feng Gong ◽  
Xiao Bo Sun ◽  
Huan Li Wang ◽  
Hai Peng Bi
Keyword(s):  
Mechanical Properties ◽  
Finite Element ◽  
Traditional Method ◽  
Element Model ◽  
Measured Data ◽  
Box Girder ◽  
Box Girder Bridge ◽  
Girder Bridge ◽  
Simplified Calculation ◽  
The Finite Element Model

The mechanical properties of cross beam in continuous box girder bridge can be obtained through analyzing the finite element model and measured data of bridge. A new simplified calculation method for cross beam is proposed in this paper, which is called modified shear method. Comparative analysis with traditional method is used to verify its feasibility and practicability.

Effect of Current Density on the Composition and Mechanical Properties of Cr1-xAlxN Coating by Ion Arc Plating

2012 ◽  
Vol 557-559 ◽  
pp. 1971-1974
Author(s):  
Cheng Xi Wang ◽  
Ji Hua Peng ◽  
Xian Wen Liang ◽  
Jun Tian
Keyword(s):  
Mechanical Properties ◽  
Surface Morphology ◽  
Current Density ◽  
Adhesion Force ◽  
Atomic Ratio ◽  
Pure Metal ◽  
Metal Target ◽  
Micro Hardness ◽  
Al Content ◽  
Maximum Value

The Cr1-xAlxN coatings were deposited onto M2 tool steel using ion arc plating technique. The effect of current density on the surface morphology and mechanical properties of TiN/CrAlN coating was made. It was found that adjusting the pure metal target currents is not only to change the metal atomic ratio, but also to influence the surface morphology, their hardness and adhesion. The micro hardness Hv increases almost linearly with Al content of the coating in this study, and the Cr0.41Al0.59N coating reaches Hv 2950. The adhesion force between the coating and the substrate reaches maximum value 55N, when the [Al]/[Al+Cr] ratio is 0.44.

Superconducting (YBaCuO)–(CuO)–Ag composites

1989 ◽  
Vol 4 (4) ◽  
pp. 802-805 ◽  
Author(s):  
Yi Song ◽  
Yue Cao ◽  
Anupam Misra ◽  
J. R. Gaines
Keyword(s):  
Mechanical Properties ◽  
Critical Current Density ◽  
Copper Oxide ◽  
Current Density ◽  
Normal State ◽  
Liquid Nitrogen Temperature ◽  
Substantial Improvement ◽  
Metallic Silver ◽  
Normal State Resistivity ◽  
Ceramic Superconductors

We have fabricated superconducting composites composed of Y1Ba2Cu3O7–δ, copper oxide, and metallic silver. Sharp superconducting transitions were observed well above the liquid nitrogen temperature. The normal state resistivity of these composites was much lower than that of the pure ceramic Y1Ba2Cu3O7–δ. The critical current density was measured and it was comparable to that of ceramic superconductors. A substantial improvement of the mechanical properties has been achieved over those of the ceramic Y1Ba2Cu3O7–δ material.

scholarly journals THE INVESTIGATON OF PHYSICAL AND MECHANICAL PROPERTIES OF NI-P COATINGS / NI-P DANGŲ FIZIKINIŲ IR MECHANINIŲ SAVYBIŲ TYRIMAS

2016 ◽  
Vol 7 (6) ◽  
pp. 605-608
Author(s):  
Vadim Chayevski ◽  
Valerij Zhylinski
Keyword(s):  
Mechanical Properties ◽  
Solid Solution ◽  
Current Density ◽  
Steel Surface ◽  
Physical And Mechanical Properties ◽  
Micro Hardness ◽  
Chloride Electrolyte ◽  
Maximum Value

The parameters of electrolytic synthesis of Ni-P coatings on steel surface from sulfate-chloride electrolyte have been determinated. The Ni-P alloys consist of separate phases of Ni and Ni3P and solid solution of implementation on the basis of the FCC Ni lattice, when it was deposited from the electrolyte at current density to be more than 7 A/dm2. The coating was formed with continuous globular surface at current density of 5 A/dm2. The globular formations are the Ni3P phase. The obtained at current density of 9 A/dm2 coatings have maximum value of micro¬hardness 430 HV. Darbe buvo nustatyti Ni-P dangų ant plieno paviršiaus elektrolitinės sintezės (iš sulfatinio-chloridinio elektrolito) parametrai. Ni-P lydinių mikrostruktūrą sudaro atskiros Ni ir Ni3P fazės arba nikelio kietasis įterpimo tirpalas, turintis kubinę paviršiaus centruotą gardelę, kai dangos yra nusodinamos iš elektrolito, esant srovės tankiui daugiau negu 7 A/dm2. Kai srovės tankis yra daugiau negu 5 A/dm2, formuojasi ištisinis, rutulinio pobūdžio dangos paviršius. Rutulio formos darinius sudaro Ni3P fazė. Dangos, turinčios didžiausią mikrokietumo reikšmę 430 HV, gautos esant srovės tankiui 9 A/dm2.

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