Development of a nanostructure microstructure in the Al–Ni system using the electrospark deposition process

2010 ◽  
Vol 210 (6-7) ◽  
pp. 892-898 ◽  
Author(s):  
D.W. Heard ◽  
M. Brochu
Keyword(s):  
Deposition Process ◽  
Electrospark Deposition

scholarly journals Влияние легирования электродов TiCNiCr добавкой Eu-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- на процесс формирования электроискрового покрытия

2018 ◽  
Vol 44 (16) ◽  
pp. 104
Author(s):  
Ф.В. Кирюханцев-Корнеев ◽  
А.Д. Сытченко ◽  
А.Е. Кудряшов ◽  
Е.А. Левашов ◽  
Д.В. Штанский
Keyword(s):  
Deposition Process ◽  
Electrospark Deposition ◽  
Energy Parameters ◽  
Coating Formation

AbstractIt is established that 1 at % Eu_2O_3 addition to the composition of TiCNiCr electrode influences the energy parameters of electrospark deposition process and increases the rate of coating formation.

scholarly journals Repairing 2024 Aluminum Alloy via Electrospark Deposition Process: A Feasibility Study

2018 ◽  
Vol 2018 ◽  
pp. 1-11 ◽  
Author(s):  
G. Renna ◽  
P. Leo ◽  
G. Casalino ◽  
E. Cerri
Keyword(s):  
Aluminum Alloy ◽  
Deposition Process ◽  
Potential Method ◽  
Filling Material ◽  
Electrospark Deposition ◽  
2024 Aluminum Alloy ◽  
Hardness Tests ◽  
Heat Treated ◽  
Substrate Properties ◽  
Scanning Electron

The electrospark deposition (ESD) technique has been studied as a potential method to repair locally damaged 2024 rolled sheets supplied in natural-aged (T4) and artificial-aged (T6) conditions. The 2024-T4 and 2024-T6 tensile samples were first notched, and then the notches were filled (repaired) by ESD with the same aluminum alloy. The effect of process parameters on the microstructure of the filling material and the substrate properties was studied by optical and scanning electron microscopy. Tensile and hardness tests were performed. The tensile test showed that T4 and T6 as-repaired specimens had low tensile properties, which was due to defectiveness and residual stress caused by high cooling rate during reparation. However, the as-repaired specimens were heat-treated at either 135°C or 190°C to improve the mechanical properties. A better yield strength was observed for the T4 heat-treated alloy. The ductility and ultimate tensile strength did not change, being mainly affected by voids and microcracks.

scholarly journals Development of Metastable Solidification Structures Using the Electrospark Deposition Process

2010 ◽  
Vol 3 (1) ◽  
pp. 105-114 ◽  
Author(s):  
M. Brochu ◽  
J. G. Portillo ◽  
J. Milligan ◽  
D. W. Heard
Keyword(s):  
Deposition Process ◽  
Electrospark Deposition

Microstructure and Properties of Ti-Al Based Composite Coating Prepared by Electrospark Deposition Process

2009 ◽  
Vol 79-82 ◽  
pp. 1611-1614
Author(s):  
Feng Guo ◽  
Xun Jia Su ◽  
Ping Li ◽  
Gen Liang Hou ◽  
Zhen Xing Mei
Keyword(s):  
Wear Resistance ◽  
Aluminum Alloy ◽  
Composite Coating ◽  
Sliding Wear ◽  
Wear Test ◽  
Deposition Process ◽  
Element Distribution ◽  
Electrospark Deposition ◽  
Layer Transition ◽  
Metallurgical Bonding

Ti-Al based composite coating was fabricated on LY12 aluminum alloy surface by electrospark deposition (ESD) process, with γ-TiAl as electrode. The microstructural characteristics, element distribution, microhardness and wear resistance of the coating were investigated. The results show that the coating forms metallurgical bonding to the substrate, which consists of strengthened layer, transition layer and heat affected zone. Besides the Al phase, the coating is also composed of Ti-Al intermetallic compounds and a small mount of Ti/Al oxides and nitrides. The microhardness of composite coating decreases gradually along the depth direction. The sliding wear test results suggest that the worn volume loss of the coating is less than one third of that of the substrate. The abradability of LY12 aluminum alloy is significantly improved. The phases with higher hardness dispersed in the coating increase not only composite coating hardness but also the resistance to micro-cutting and plowing during the sliding wear test. In addition, the excellent sliding wear resistance of composite coating is also related to the metallurgical bonding between the coating and the substrate.

Wear Behavior of Pure Titanium Coated With WC-Co by the Use of Electrospark Deposition Method

2019 ◽  
Vol 141 (5) ◽  
Author(s):  
Seyyed Jaber Razavi Arab ◽  
Hossein Aghajani
Keyword(s):  
Wear Resistance ◽  
Wear Behavior ◽  
Pure Titanium ◽  
Weight Ratio ◽  
High Strength ◽  
Deposition Process ◽  
Deposition Method ◽  
Electrospark Deposition ◽  
Substrate Properties ◽  
Pin On Disk

Titanium is a highly interesting material in engineering because of its unique combination of high strength to weight ratio, excellent resistance to corrosion, and biocompatibility. However, the material’s low wear resistance, which is its inherent nature, limits its application in highly erosive conditions. In order to enhance the wear resistance of biomedical grade titanium with the help of a WC-Co coating, an electrospark deposition method was used in this work. The goal of this work is to investigate the effect of frequency and current upper limit in the electrospark deposition process on substrate properties. Hardness of the layers was measured by a microhardness tester. In order to study the morphology and microstructure of surface layers, scanning electron microscope was used. Tribological tests were conducted under technically dry friction conditions at a load of 12.5 N by a pin-on-disk tribometer. Titanium was observed in coating and metallurgical bonding between the coating and the substrate. The optimized sample's hardness was about 930 HV 0.1. Results showed that the presence of a carbide layer on the surface of titanium leads to a great enhancement of wear resistance of about 68% in the pin-on-disk test.

Reaction couples of ceramic thin films prepared by CVD

1988 ◽  
Vol 46 ◽  
pp. 798-799
Author(s):  
D.W. Susnitzky ◽  
S.R. Summerfelt ◽  
C.B. Carter
Keyword(s):  
Thin Film ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Deposition Process ◽  
Solid State Reactions ◽  
Spatial Distributions ◽  
Diffusion Couples ◽  
Kinetics Studies ◽  
Ceramic Thin Films ◽  
Initial Stage

Solid-state reactions have traditionally been studied in the form of diffusion couples. This ‘bulk’ approach has been modified, for the specific case of the reaction between NiO and Al2O3, by growing NiAl2O4 (spinel) from electron-transparent Al2O3 TEM foils which had been exposed to NiO vapor at 1415°C. This latter ‘thin-film’ approach has been used to characterize the initial stage of spinel formation and to produce clean phase boundaries since further TEM preparation is not required after the reaction is completed. The present study demonstrates that chemical-vapor deposition (CVD) can be used to deposit NiO particles, with controlled size and spatial distributions, onto Al2O3 TEM specimens. Chemical reactions do not occur during the deposition process, since CVD is a relatively low-temperature technique, and thus the NiO-Al2O3 interface can be characterized. Moreover, a series of annealing treatments can be performed on the same sample which allows both Ni0-NiAl2O4 and NiAl2O4-Al2O3 interfaces to be characterized and which therefore makes this technique amenable to kinetics studies of thin-film reactions.

Observations on the growth of barium bismuth oxide thin films

1992 ◽  
Vol 50 (1) ◽  
pp. 76-77
Author(s):  
M G. Norton ◽  
E.S. Hellman ◽  
E.H. Hartford ◽  
C.B. Carter
Keyword(s):  
Substrate Temperature ◽  
Deposition Process ◽  
Nucleation Layer ◽  
Second Stage ◽  
Device Applications ◽  
High Transition ◽  
Substrate Temperatures ◽  
Oriented Material ◽  
Barium Bismuth ◽  
Superconductor Device

The bismuthates (for example, Ba1-xKxBiO3) represent a class of high transition temperature superconductors. The lack of anisotropy and the long coherence length of the bismuthates makes them technologically interesting for superconductor device applications. To obtain (100) oriented Ba1-xKxBiO3 films on (100) oriented MgO, a two-stage deposition process is utilized. In the first stage the films are nucleated at higher substrate temperatures, without the potassium. This process appears to facilitate the formation of the perovskite (100) orientation on (100) MgO. This nucleation layer is typically between 10 and 50 nm thick. In the second stage, the substrate temperature is reduced and the Ba1-xKxBiO3 is grown. Continued growth of (100) oriented material is possible at the lower substrate temperature.

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