Microstructure and Performance of Nanocrystalline Nickel Parts

2011 ◽  
Vol 287-290 ◽  
pp. 420-423
Author(s):  
Jin Song Chen
Keyword(s):  
Dimensional Accuracy ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Nanocrystalline Nickel ◽  
Fine Grained ◽  
Rapid Fabrication ◽  
Jet Electrodeposition ◽  
Fine Grained Structure ◽  
And Performance ◽  
Microstructure And Performance

Jet electrodeposition orientated by rapid fabrication were introduced , The nanocrystalline nickel parts were fabricated using jet electrodeposition . The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument . The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure with a smooth surface and high dimensional accuracy under the optimum processing parameters.

A Study on Nanocrystalline Nickel Parts Prepared by Jet Electrodeposition

2010 ◽  
Vol 37-38 ◽  
pp. 64-67
Author(s):  
Jin Song Chen ◽  
Yin Hui Huang ◽  
Bin Qiao ◽  
Jian Ming Yang ◽  
Yi Qiang He
Keyword(s):  
Dimensional Accuracy ◽  
Processing Parameters ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Nanocrystalline Nickel ◽  
X Ray ◽  
Fine Grained ◽  
Average Grain Size ◽  
Jet Electrodeposition ◽  
Fine Grained Structure

The principles of jet electrodeposition orientated by rapid prototyping were introduced. The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument. The results show that the jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure (average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters.

Electrodeposited Nanocrystalline Nickel Parts

2012 ◽  
Vol 201-202 ◽  
pp. 1102-1105
Author(s):  
Jin Song Chen ◽  
Jian Ming Yang
Keyword(s):  
Rapid Prototyping ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Nanocrystalline Nickel ◽  
Fine Grained ◽  
Average Grain Size ◽  
Machined Parts ◽  
Jet Electrodeposition ◽  
Fine Grained Structure ◽  
Metallic Parts

The principles of jet electrodeposition orientated by rapid prototyping were introduced , The nanocrystalline nickel parts with simple shape were fabricated using jet electrodeposition oriented by rapid prototyping. The microstructure and phase transformation of nanocrystalline nickel were observed under the scanning microscope and X-ray diffraction instrument . The results show that the successful fabrication of metallic parts demonstrates the potential of the jet electrodeposition process for prototyping technology . The jet electrodeposition can greatly enhance the limited current density, fine crystalline particles and improve deposition quality. The nickel parts prepared by jet electrodeposition own a fine-grained structure( average grain size 25.6nm) with a smooth surface and high dimensional accuracy under the optimum processing parameters..The dimensional accuracy as well as the surface quality of metallic parts and tools manufactured using jet electrodeposition techniques still lag far behind those of conventionally machined parts.

Modification of microstructure and performance via doping Ti in W–1TiC fine-grained alloy

2021 ◽  
Vol 825 ◽  
pp. 141918
Author(s):  
Ziwei Zhang ◽  
Siqi Zhao ◽  
Yongqi Lv ◽  
Hongbo Zhang ◽  
Zhenwei Wang ◽  
...  
Keyword(s):  
Fine Grained ◽  
And Performance ◽  
Microstructure And Performance

scholarly journals Effect of Radial Forging on the Microstructure and Mechanical Properties of Ti-Based Alloys

Metals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 1488
Author(s):  
Lev B. Zuev ◽  
Galina V. Shlyakhova ◽  
Svetlana A. Barannikova
Keyword(s):  
Phase State ◽  
Metal Flow ◽  
Mechanical Processing ◽  
Radial Forging ◽  
X Ray Diffraction ◽  
Two Phase ◽  
X Ray ◽  
Fine Grained ◽  
Fine Grained Structure

Radial forging is a reliable way to produce Ti alloy rods without preliminary mechanical processing of their surface, which is in turn a mandatory procedure during almost each stage of the existing technology. In the present research, hot pressing and radial forging (RF) of the titanium-based Ti-3.3Al-5Mo-5V alloy were carried out to study the specifics of plasticized metal flow and microstructural evolution in different sections of the rods. The structural analysis of these rods was performed using metallography and X-ray diffraction techniques. The X-ray diffraction reveals the two-phase state of the alloy. The phase content in the alloy was shown to vary upon radial forging. Finally, radial forging was found to be a reliable method to achieve the uniform fine-grained structure and high quality of the rod surface.

The Application of Nano-Structured Silica Based Admixture in Gypsum Binders

2014 ◽  
Vol 1611 ◽  
pp. 165-170 ◽  
Author(s):  
E.V. Voitovich ◽  
A.V. Cherevatova ◽  
I.V. Zhernovsky ◽  
H.-B. Fisher ◽  
K. Sobolev
Keyword(s):  
Quartz Sand ◽  
Mechanical Performance ◽  
Experimental Studies ◽  
Experimental Program ◽  
X Ray Diffraction ◽  
High Concentration ◽  
Fine Grained ◽  
Fine Grained Structure ◽  
Size And Morphology ◽  
Nanostructured Silica

ABSTRACTThis article reports on a new composite gypsum binder (CGB) with nanostructured silica-based admixture (NSS). NSS is obtained by a wet ultrafine milling of quartz sand resulting in the formation of an inorganic polydisperse binding system, which has a high concentration of active nanoscale phase (about 10%). Developed CGB contains hemihydrate gypsum and nano-component based on quartz sand. It is observed that the addition of 15–20 % of NSS improves the rheological properties of gypsum systems through the formation of solvate shells hindering the access of water to gypsum particles; this process also retards the setting of binder.The experimental program used infrared IR spectroscopy, X-ray diffraction (XRD) and scanning electron microscopy (SEM) to reveal the contribution of NSS. The porosity of CGB is analyzed by the kinetics of water adsorption and BET. The XRD and IR investigations determined the formation of a new sulfosilicate phase, hydroxyellestadite during the hydration of CGB. With the addition of NSS an overall reduction in pore volume, as well as the shifts in macro-, meso- and nano- porosity values are observed.Analysis of CGB microstructure reveals that in the presence of the NSS the size and morphology of crystals are changed contributing to the formation of dense fine-grained structure. Experimental studies have demonstrated that the composite gypsum binders with NSS are characterized by reduced water absorption and increased density, as well as improved mechanical performance especially, higher compressive strength.

Influence of Ti on the Microstructure and Performance of Fe-Cr Alloy Cladding Layer

2016 ◽  
Vol 849 ◽  
pp. 709-715
Author(s):  
Jian Yang Liu ◽  
Qing Tao ◽  
Wei Lai ◽  
Wei Wei Tang ◽  
Jian Wang ◽  
...  
Keyword(s):  
Mass Fraction ◽  
Hardness Test ◽  
Wear Volume ◽  
Micro Hardness ◽  
X Ray Diffraction ◽  
Hardness Tester ◽  
Optical Micrograph ◽  
Series Alloy ◽  
And Performance ◽  
Microstructure And Performance

Considering the multi-porous and rimous Fe-Cr series alloy coatings deposited on Q235 steel by plasma arc welding, the mass fraction of 0%, 2%, 4%, 6%, 8% Ti is mixed into Fe-Cr alloy powder. The microstructure and characteristics of the Fe-Cr series alloys with a range content of Ti were investigated using optical micrograph (OM), X-ray diffraction (XRD), scanning electron micrograph (SEM) Digital Micro-hardness Tester and M-2000 dry abrasion tester. The major phase of the Fe-Cr layers is dendrite with the lath carbide mixed between the limb of dendrite and the grains refine with addition of Ti. The XRD result indicates the main phases are (Fe-Cr) solution, Cr23C6, and TiC, while the result of Digital Micro-hardness test shows the microhardness increases with the mass fraction of Ti till it comes to 4% and decreases with the following addition of Ti. The highest average hardness of layer is 750HV with content of 4% Ti, while the coating with 2% Ti appears better wear resistance with the least wear volume for the match of toughness matrix and hard phase. Hence, the coating with 2% to 4% Ti shows the best property.

Microstructure of WC–Co–VN carbide catrix for drilling tools diamond-containing materials

2020 ◽  
pp. 21-30
Author(s):  
N.A. Bondarenko ◽  
◽  
V.A. Mechnik ◽  
R.A. Hasanov ◽  
V.N. Kolodnitsky ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Wear Intensity ◽  
Vanadium Nitride ◽  
Fine Grained ◽  
Strength Limit ◽  
Operational Characteristics ◽  
Drilling Tools ◽  
Fine Grained Structure ◽  
Carbide Matrix ◽  
And Performance

The results of studies aimed at improving the structure and performance characteristics of carbide matrices WC-Co samples, formed by cold pressing and thereafter hot pressing, for drilling tools diamond-containing materials. It is shown that the introduction of vanadium nitride in an amount of 3% into the composition of the starting materials 94WC-6Co provides an increase in the hardness of the sample from 22.8 to 34.2 GPa, the strength limit in compression from 4800 to 5340 MPa and bending from 2200 to 2280 MPa, as well as reduction of wear intensity from 1710×10-6 to 5200×10-6 g/m. The revealed effect of the formation of a fine-grained structure of a carbide matrix WC-Co-VN with increased mechanical and operational characteristics indicates the need for their use in the development of effective tools for drilling oil and gas wells.

Initial Work on the Application of Protective Coatings to Marine Gas Turbine Components by High-Rate Sputtering

1974 ◽  
Author(s):  
E. D. McClanahan ◽  
R. Busch ◽  
J. W. Patten ◽  
J. Fairbanks
Keyword(s):  
Gas Turbines ◽  
Protective Coatings ◽  
Turbine Blades ◽  
High Rate ◽  
Sputtering Deposition ◽  
Fine Grained ◽  
Radio Frequency Sputtering ◽  
Initial Work ◽  
Fine Grained Structure ◽  
And Performance

Gas turbines operated in the marine environment are limited in life and performance by sulfidation or hot-corrosion. Protective coatings deposited by sputtering appear to have the potential of significantly increasing engine life over that obtained with current coatings produced by other techniques. The sputtering process and its application to coating hot section components is the subject of this paper. Two programs are described. In one, metallic overlay coatings of the CoCrAlY type were deposited by dc triode sputtering. Deposition conditions were determined which resulted in adherent, crack-free coatings with a fine grained structure. Platinum diffusion barrier layers were also investigated. Sputtering apparatus suitable for coating turbine blades and vanes was constructed. The other program utilized supported discharge radio frequency sputtering to deposit zirconia coatings, which were intended to serve a thermal barrier function as well as a corrosion resistant one. Graded composition interlayers were investigated as a means of improving the compatibility of the zirconia coating with superalloys.

Influence of Processing on Microstructure and Performance of EB-PVD Thermal Barrier Coatings

2000 ◽  
Author(s):  
U. Schulz ◽  
K. Fritscher ◽  
C. Leyens ◽  
M. Peters
Keyword(s):  
Processing Parameters ◽  
Columnar Structure ◽  
Thermally Grown Oxide ◽  
Thermal Barrier ◽  
Processing Conditions ◽  
Cyclic Life ◽  
Barrier Coatings ◽  
Equiaxed Zone ◽  
And Performance ◽  
Microstructure And Performance

The paper addresses the effect of processing parameters on microstructure and lifetime of EB-PVD PYSZ coatings deposited onto NiCoCrAlY-coated Ni-base superalloys. In particular, the formation of a thermally grown oxide layer, an equiaxed zone, and various columnar arrangements of the highly textured PYSZ layers are discussed with respect to processing conditions. Three different microstructures were cyclically tested at 1100°C. The intermediate columnar structure was superior with respect to cyclic life times to a fine and to a coarse columnar structure which was mainly attributed to differences in the elastic properties. The effect of PYSZ microstructure on hot corrosion behavior of the TBC system at 950°C is briefly discussed.

scholarly journals Lightweight High-Performance Polymer Composite for Automotive Applications

Polymers ◽  
2019 ◽  
Vol 11 (2) ◽  
pp. 326 ◽  
Author(s):  
Valentina Volpe ◽  
Sofia Lanzillo ◽  
Giovanni Affinita ◽  
Beniamino Villacci ◽  
Innocenzo Macchiarolo ◽  
...  
Keyword(s):  
Glass Fiber ◽  
Automotive Industry ◽  
High Performance ◽  
Injection Pressure ◽  
Dimensional Accuracy ◽  
Processing Parameters ◽  
Injection Molding Process ◽  
Polyamide 66 ◽  
Molding Process ◽  
And Performance

The automotive industry needs to produce plastic products with high dimensional accuracy and reduced weight, and this need drives the research toward less conventional industrial processes. The material that was adopted in this work is a glass-fiber-reinforced polyamide 66 (PA66), a material of great interest for the automotive industry because of its excellent properties, although being limited in application because of its relatively high cost. In order to reduce the cost of the produced parts, still preserving the main properties of the material, the possibility of applying microcellular injection molding process was explored in this work. In particular, the influence of the main processing parameters on morphology and performance of PA66 + 30% glass-fiber foamed parts was investigated. An analysis of variance (ANOVA) was employed to identify the significant factors that influence the morphology of the molded parts. According to ANOVA results, in order to obtain homogeneous foamed parts with good mechanical properties, an injection temperature of 300 °C, a high gas injection pressure, and a large thickness of the parts should be adopted.

Sign in / Sign up

Export Citation Format

Share Document