EDM Surface Characterization of a Ceramic Composite TiB2/SiC

1991 ◽  
Vol 113 (4) ◽  
pp. 437-442 ◽  
Author(s):  
M. Ramulu ◽  
J. L. Garbini
Keyword(s):  
Electrical Discharge ◽  
Surface Characterization ◽  
Ceramic Composite ◽  
Surface Characteristics ◽  
Power Input ◽  
Recast Layer ◽  
Electrically Conductive ◽  
The Individual ◽  
Edm Process

Electrical Discharge Machined (EDM) hole surface characteristics of 20 percent Titanium diboride (TiB2) particulate and Silicon carbide (SiC) matrix composite material were investigated. The EDM hole surfaces produced by using brass, copper and graphite were examined by scanning electron microscopy (SEM) and surface profilometry to determine the surface characteristics. As-machined surfaces showed the microcracks in the recast layer, and the individual TiB2 grains were exposed on the surface. The depth of the recast structure on the surface has varied from 8 μm to less than a micrometer and was approximately proportional to the amount of impinging energy or power input. The EDM process appears to be a promising method of producing an excellent surface in electrically conductive TiB2/SiC composite under slow cutting conditions.

scholarly journals Post-Processing and Surface Characterization of Additively Manufactured Stainless Steel 316L Lattice: Implications for BioMedical Use

Materials ◽  
2021 ◽  
Vol 14 (6) ◽  
pp. 1376
Author(s):  
Alex Quok An Teo ◽  
Lina Yan ◽  
Akshay Chaudhari ◽  
Gavin Kane O’Neill
Keyword(s):  
Surface Roughness ◽  
Stainless Steel ◽  
Surface Characterization ◽  
High Surface ◽  
Surface Characteristics ◽  
Post Processing ◽  
Stainless Steel 316L ◽  
Processing Methods ◽  
Particulate Debris

Additive manufacturing of stainless steel is becoming increasingly accessible, allowing for the customisation of structure and surface characteristics; there is little guidance for the post-processing of these metals. We carried out this study to ascertain the effects of various combinations of post-processing methods on the surface of an additively manufactured stainless steel 316L lattice. We also characterized the nature of residual surface particles found after these processes via energy-dispersive X-ray spectroscopy. Finally, we measured the surface roughness of the post-processing lattices via digital microscopy. The native lattices had a predictably high surface roughness from partially molten particles. Sandblasting effectively removed this but damaged the surface, introducing a peel-off layer, as well as leaving surface residue from the glass beads used. The addition of either abrasive polishing or electropolishing removed the peel-off layer but introduced other surface deficiencies making it more susceptible to corrosion. Finally, when electropolishing was performed after the above processes, there was a significant reduction in residual surface particles. The constitution of the particulate debris as well as the lattice surface roughness following each post-processing method varied, with potential implications for clinical use. The work provides a good base for future development of post-processing methods for additively manufactured stainless steel.

Surface Characterization of an Extruded 6060 Al Alloy

2007 ◽  
Vol 29-30 ◽  
pp. 67-70
Author(s):  
Wei Zhang ◽  
Jim Metson ◽  
C.L. Nguyen ◽  
S. Chen
Keyword(s):  
Aluminium Alloy ◽  
Photoelectron Spectroscopy ◽  
Surface Characterization ◽  
Extrusion Direction ◽  
Surface Characteristics ◽  
Al Alloy ◽  
X Ray ◽  
Film Instability ◽  
Mg Content

The surface characteristics of an extruded 6060 aluminium alloy were investigated with X-ray Photoelectron Spectroscopy (XPS). The results revealed that the extruded surface was covered by oxides of aluminium and magnesium. The thickness of aluminium oxide was found to change along the extrusion direction with the thinnest and thickest oxide at the beginning and end of the extrudate, respectively. Magnesium segregation was found on the surface of the extrusion with the highest and lowest Mg concentration at the beginning and end of the extrudate, respectively. This is the inverse result of that expected where increasing Mg content was believed to be associated with film instability and thicker films.

Surface Quality of Cavities Obtained by EDM Process

2011 ◽  
Vol 223 ◽  
pp. 931-939
Author(s):  
Rodrigo Panosso Zeilmann ◽  
Gerson Luiz Nicola ◽  
Fernando Moreira Bordin ◽  
Tiago Vacaro ◽  
Mariana Czarnobay Zanotto
Keyword(s):  
Surface Quality ◽  
Electrical Discharge Machining ◽  
Subsurface Layer ◽  
Side Wall ◽  
Machining Processes ◽  
Electrically Conductive ◽  
Machined Parts ◽  
Edm Process

The electrical discharge machining (EDM) is a process widely used in machining of complex geometries and hardened materials, conditions that often are not met by conventional machining processes. In EDM the electrode reproduces its image or geometry on the part and this image is obtained by chip removing process, which is given by high frequency electrical discharges, causing the melting and vaporization of electrically conductive materials. Due to this mechanism of material removal, the surface is subjected to high thermal loads, which heavily influences the surface quality of obtained parts. For the characterization of these surfaces must be considered the surface topography and the metallurgical changes of the subsurface layer, since both characteristics influence the functionality of the machined parts. In addition, several variables related to the EDM process have influence on the characteristics of the generated surface. This work presents a study of the influence of EDM process on the surface quality of square cavities. It was evaluated different regions of the cavities, such as side wall, bottom and corners. The results showed significant differences between the analyzed regions.

scholarly journals Tribological characterization of a hip prosthesis in Si3N4-TiN ceramic composite made with Electrical Discharge Machining (EDM)

2021 ◽  
Vol 33 ◽  
pp. 469-481
Author(s):  
Danilo D’Andrea ◽  
Alessandro Pistone ◽  
Giacomo Risitano ◽  
Dario Santonocito ◽  
Lorenzo Scappaticci ◽  
...  
Keyword(s):  
Electrical Discharge ◽  
Ceramic Composite ◽  
Electrical Discharge Machining ◽  
Hip Prosthesis ◽  
Tribological Characterization

scholarly journals Review on Effects of Electrode in Electrical Discharge Machining Process

2021 ◽  
Vol 8 (5) ◽  
pp. 91-95
Author(s):  
Nayan J. Patel
Keyword(s):  
Electrical Discharge ◽  
Electrode Materials ◽  
Electrical Discharge Machining ◽  
Research Work ◽  
Vital Role ◽  
Machining Process ◽  
Process Selection ◽  
Machining Processes ◽  
Electrically Conductive ◽  
Edm Process

Electrical Discharge Machining is one of the non-conventional machining processes used for electrically conductive material. It is widely used for manufacturing complicated parts which are tough to be produced by conventional manufacturing processes. It is based on thermoelectric energy between workpiece and electrode. Metal is removed by melting and vaporizing because of spark occurs in the gap between electrode and workpiece. Workpiece and electrode must have electrically conductive to generate a spark. The performance of the EDM process is largely depends on the electrode. Electrode is considered as tool in EDM process. Selection of the electrode material plays vital role in the EDM process. Different electrode materials have different properties. Hence, the performance of the EDM process changes with different materials. Researchers have used different materials as electrode to investigate the effects of materials and to improve the performance of EDM process. This paper reviews the research work carried out in the field of materials and manufacturing methods for electrodes in EDM process. Keywords: [EDM, Electrodes, Materials, Manufacturing Process].

Surface Modification by Electrical Discharge Machining of Sintered NdFeB Magnet

2010 ◽  
Vol 139-141 ◽  
pp. 390-393
Author(s):  
Li Li ◽  
Li Ling Qi ◽  
Xiao Qing Zhai ◽  
Dong Wang
Keyword(s):  
Surface Roughness ◽  
Pulse Energy ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Surface Characteristics ◽  
Recast Layer ◽  
Dielectric Fluid ◽  
Machining Parameters ◽  
Ndfeb Magnet ◽  
Machining Parameter

In this study, the electrical discharge machining (EDM) of sintered NdFeB magnet was investigated. The surface characteristics were studied in terms of machining parameters. Correlation between the surface roughness, hardness, recast layer and the machining parameter were analyzed. Results show that an excellent machined finish can be obtained by setting the machine parameters at low pulse energy. Low pulse energy reduces the frequency of bursts of dielectric fluid and melt expulsions.

Surface and aerosol retrieval from S5P and S4: baseline requirements and expected performance

2020 ◽  
Author(s):  
Pavel Litvinov ◽  
Oleg Dubovik ◽  
Cheng Chen ◽  
Anton Lopatin ◽  
Tatyana Lapionak ◽  
...  
Keyword(s):  
Spectral Range ◽  
Surface Characterization ◽  
Surface Characteristics ◽  
Trace Gas ◽  
Inversion Algorithm ◽  
Earth Observations ◽  
Expected Performance ◽  
Infrared Spectral ◽  
Important Input

<p>Sentinel-4 and Sentinel-5p instruments provide hyperspectral measurements in UV, VIS and infrared spectral range. Though the main purpose of the satellites is trace gas characterization, both instruments are capable of aerosol and surface characterization. In particular, S4 and S5p measurements in UV have unique information about absorption and elevation properties of aerosol. Moreover, measurements in wide spectral range are very sensitive to aerosol size and surface type. On one hand, aerosol and surface characteristics are important input parameters for different trace gases such as ozone, NO2, BrO, CH2O, H2O, CO2, CO, and CH4. On another hand, aerosol and surface characteristics are very important on their own for climate studies, air pollution and surface monitoring.</p><p>The quantitative characterization of aerosol (AOD (Aerosol Optical Depth), aerosol type) and surface properties (BRDF (Bidirectional Reflectance Distribution Function)) from Sentinel-4 and Sentinel-5p instruments is a topic for several ESA/EUMETSAT projects. In particular, in the framework of S5P+I AOD/BRDF project an innovative algorithm will be developed which integrates the advanced GRASP algorithm (Dubovik et al. 2011, 2014) with the heritage AOD and DLER algorithm previously applied to TOMS, GOME(-2), SCIAMACHY and OMI sensors (Tilstra et al., 2017). Innovative GRASP algorithm is expected to provide surface BRDF and AOD with the accuracy required by most trace gas retrieval algorithms.</p><p>Here the requirements on aerosol and surface characterization from S4 and S5p instruments will be analyzed. On the basis of inversion results from the synthetic (S4) and real (S5p) measurements we discuss how expected AOD and BRDF accuracy from the innovative and GRASP/S4 algorithms meet these requirements. New advanced possibility of aerosol and surface characterization with GRASP from S5p instrument will be discussed.</p><p><strong>References</strong></p><ol><li>Dubovik, O., et al., “Statistically optimized inversion algorithm for enhanced retrieval of aerosol properties from spectral multi-angle polarimetric satellite observations”, Atmos. Meas. Tech., 4, 975-1018, 2011.</li> <li>Dubovik, O., et al. “GRASP: a versatile algorithm for characterizing the atmosphere”, SPIE: Newsroom, doi:10.1117/2.1201408.005558, Published Online: http://spie.org/x109993.xml, September 19, 2014.</li> <li>Tilstra, L. G., et al., “Surface reflectivity climatologies from UV to NIR determined from Earth observations by GOME-2 and SCIAMACHY”, J. Geophys. Res. Atmos., 122, 4084–4111.</li> </ol>

Current Research Trends on Dry, Near-Dry and Powder Mixed Electrical Discharge Machining

2011 ◽  
Vol 264-265 ◽  
pp. 956-961 ◽  
Author(s):  
Md. Ashikur Rahman Khan ◽  
M.M. Rahman ◽  
M.M. Noor ◽  
K. Kadirgama ◽  
M.A. Maleque
Keyword(s):  
Surface Finish ◽  
Electrical Discharge ◽  
Electrical Discharge Machining ◽  
Removal Rate ◽  
Research Trends ◽  
Dielectric Fluid ◽  
Electrically Conductive ◽  
Conventional Machining ◽  
Edm Process ◽  
Dies And Moulds

Electrical discharge machining (EDM) technique has been widely used in modern metal working industry for producing complex cavities in dies and moulds, which are otherwise difficult to create by conventional machining. The process has the advantage of being able to machine hardened tool steels. However, its low machining efficiency and poor surface finish restricted its further applications. To address these problems, one relatively new technique used to improve the efficiency and surface finish is EDM in the presence of powder suspended in the dielectric fluid. Powder mixed electric discharge machining (PMEDM) is one of the recent innovations for the enhancement of capabilities of EDM process. In PMEDM, the electrically conductive powder is mixed in the dielectric fluid of EDM, which reduces the insulating strength of the dielectric fluid and increases the spark gap between the tool and workpiece. As a result, the process becomes more stable, thereby, improving the material removal rate (MRR) and surface finish. Moreover, the surface develops high resistance to corrosion and abrasion. This paper presents the current research trends on dry, near dry EDM and review on research carried out in the area of PMEDM.

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