Effect of Fusion Temperature of Electric-Discharge Erosion Cobalt–Chromium Powder Particles on the Quality of Additive Products

2021 ◽  
Vol 50 (6) ◽  
pp. 562-568
Author(s):  
E. V. Ageev ◽  
A. Yu. Altukhov ◽  
E. V. Ageeva
Keyword(s):  
Electric Discharge ◽  
Cobalt Chromium ◽  
Fusion Temperature ◽  
Chromium Powder ◽  
Powder Particles

Cobalt-Chromium Powder Alloys and Retention Coatings Made from Them for Orthopaedic Stomatology

2005 ◽  
Vol 44 (5-6) ◽  
pp. 207-210 ◽  
Author(s):  
A. V. Besov ◽  
V. A. Maslyuk ◽  
A. N. Stepanchuk ◽  
S. G. Napara-Volgina ◽  
L. N. Orlova
Keyword(s):  
Cobalt Chromium ◽  
Chromium Powder ◽  
Powder Alloys

Influence of the Powder Particle Size on the Denudated Zone Width at Selective Laser Melting

2020 ◽  
Vol 989 ◽  
pp. 816-820
Author(s):  
Roman Sergeevich Khmyrov ◽  
R.R. Ableyeva ◽  
Tatiana Vasilievna Tarasova ◽  
A.V. Gusarov
Keyword(s):  
Particle Size ◽  
Selective Laser Melting ◽  
Powder Particle ◽  
Powder Particle Size ◽  
Adhesion Forces ◽  
Laser Melting ◽  
Friction Forces ◽  
Single Bead ◽  
Powder Particles

Mass transfer in the laser-interaction zone at selective laser melting influences the quality of the obtained material. Powder particles displacement during the formation of the single bead is experimentally studied. The so-called denudated zone was visualized by metallography. It was determined that increasing the powder particle size leads to widening the denudated zone. This can signify that the adhesion forces between powder particles prevail over the friction forces.

A New Technology of Hardening Porous Materials of Titan Powders

2007 ◽  
Vol 534-536 ◽  
pp. 613-616
Author(s):  
K.E. Belyavin ◽  
D.V. Minko ◽  
N.V. Reshnetikov
Keyword(s):  
Porous Materials ◽  
Electric Discharge ◽  
New Technology ◽  
Alternating Current ◽  
Maximum Strength ◽  
Structure And Properties ◽  
Optimum Range ◽  
Technological Regimes ◽  
Before And After ◽  
Powder Particles

A technology of hardening porous materials of titan powders has been elaborated. The technology is based on passing alternating current with duration of ~10-1…101 s through porous (35…40%) blanks made by method of Sintering by Electric Discharge (SED) by passing a pulse of current with duration of ~10-5…10-3 s. The influence of technological regimes of porous blanks treatment on their structure and properties is investigated. Geometry and dimension of contact necks between powder particles of obtained samples are evaluated. Variations of porosity and strengths as well as microstructure of porous samples materials before and after treatment are investigated. Optimum range of treatment technological regimes is determined within which porosity of 30…35% with maximum strength values.

Core Materials of Vacuum Insulation Panels: A Review and Beyond

2012 ◽  
Vol 174-177 ◽  
pp. 1437-1440 ◽  
Author(s):  
Cheng Dong Li ◽  
Zhao Feng Chen ◽  
Wang Ping Wu ◽  
Zhou Chen ◽  
Jie Ming Zhou ◽  
...  
Keyword(s):  
High Performance ◽  
Insulation Material ◽  
Vacuum Insulation ◽  
Novel Structure ◽  
Powder Particles ◽  
Insulation Performance ◽  
Size Powder ◽  
Material Powder ◽  
Core Materials

Vacuum insulation panels (VIPs) are regarded as one of the most promising high performance thermal insulation solutions on the market today. The insulation performance of VIPs mainly depends on the quality of core materials. This paper compared three types of core materials, namely foam insulation material, powder insulation material and fibrous insulation material. Novel structure of core materials which is fiber pore structures packed with different size powder particles is also put forward on this paper. The aim of this paper is to investigate and compare various properties, requirements and possibilities for traditional core materials and put forward possible future core materials of VIPs.

scholarly journals Experimental study on quality of PCD tools machined by different electric discharge grinding processes

2016 ◽  
Vol 3 (1) ◽  
Author(s):  
Guangxian Li ◽  
Mohammad Zulafif Rahim ◽  
Songlin Ding ◽  
Shoujin Sun ◽  
John Mo
Keyword(s):  
Experimental Study ◽  
Electric Discharge ◽  
Grinding Processes ◽  
Pcd Tools

Methodology for Modelling Diffusion Bonding in Powder Forging

2016 ◽  
Vol 716 ◽  
pp. 817-823
Author(s):  
Yi Wang ◽  
Idris K. Mohammed ◽  
Daniel S. Balint
Keyword(s):  
Process Parameters ◽  
Diffusion Bonding ◽  
Bonding Process ◽  
Volume Element ◽  
Particle Packing ◽  
Forging Process ◽  
Forming Load ◽  
Temperature Load ◽  
Powder Particles

Interfacial bonding has a significant influence on the quality of processed components formed by powder forging. Consequently, modelling the bonding process is important for controlling the condition of the components and predicting optimum forging process parameters (e.g. forming load, temperature, load-holding time, etc.). A numerical model was developed in the present work to simulate diffusion bonding (DB) during the direct powder forging (DF) process. A set of analytical equations was derived and implemented in the finite element (FE) software Abaqus via a user-defined subroutine. The DB model was validated using a two-hemisphere compression simulation. The numerical results demonstrated that the DB model has the ability to: 1) determine the bonding status between powder particles during the forging process, and 2) predict the optimum value for key powder forging process parameters. The DB model was also implemented in a representative volume element (RVE) model which was developed in an earlier work to simulate the powder forging process by considering particle packing and thermo-mechanical effects.

scholarly journals Review of Powder Bed Fusion Additive Manufacturing for Metals

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1391
Author(s):  
Leila Ladani ◽  
Maryam Sadeghilaridjani
Keyword(s):  
Additive Manufacturing ◽  
Three Dimensional ◽  
Disruptive Technology ◽  
Powder Bed ◽  
Powder Particles ◽  
Metallic Parts ◽  
The Cost ◽  
Scientific Questions ◽  
Metal Additive

Additive manufacturing (AM) as a disruptive technology has received much attention in recent years. In practice, however, much effort is focused on the AM of polymers. It is comparatively more expensive and more challenging to additively manufacture metallic parts due to their high temperature, the cost of producing powders, and capital outlays for metal additive manufacturing equipment. The main technology currently used by numerous companies in the aerospace and biomedical sectors to fabricate metallic parts is powder bed technology, in which either electron or laser beams are used to melt and fuse the powder particles line by line to make a three-dimensional part. Since this technology is new and also sought by manufacturers, many scientific questions have arisen that need to be answered. This manuscript gives an introduction to the technology and common materials and applications. Furthermore, the microstructure and quality of parts made using powder bed technology for several materials that are commonly fabricated using this technology are reviewed and the effects of several process parameters investigated in the literature are examined. New advances in fabricating highly conductive metals such as copper and aluminum are discussed and potential for future improvements is explored.

Development of a total hip replacement phantom for the assessment of CT-image quality

2020 ◽  
Vol 61 (12) ◽  
pp. 1644-1652
Author(s):  
Mara Muellensiefen ◽  
Bernhard Tins ◽  
Jan-Herman Kuiper ◽  
Marc-André Weber ◽  
Holger Krakowski-Roosen
Keyword(s):  
Quality Assurance ◽  
Image Quality ◽  
Femoral Component ◽  
Hip Prosthesis ◽  
Pelvic Bone ◽  
Bone Lesions ◽  
Cobalt Chromium ◽  
Joint Replacement Surgery ◽  
Metal Artefacts

Background The quality of computed tomography (CT) imaging is important when used to judge the success of joint replacement surgery. Metal artefacts are a known source of error, typically compensated by noise reduction software. Purpose To develop a transportable and stable system for the assessment of image quality of bone lesions around orthopedic implants. Material and Methods The design and manufacture of a bone-implant-phantom is described, which is based on a calf acetabulum with surrounding pelvic bone structures. Bone lesions of several sizes were created in the acetabulum before implanting the cup of an uncemented hip prosthesis, which was fixed with a stainless-steel bone screw. Plastic strips were placed on a cobalt–chromium stemmed femoral component, simulating typical bone lesions around loosening or infected prostheses, before embedding the stem in material similar to bone and shaped like a femur. The head of the femoral component was then placed in the acetabular cup and CT scans were produced. Results It was possible to construct a durable CT hip phantom for quality assurance work. The usability of different materials and the choices made for the phantom are discussed. Conclusion It is possible to construct a durable joint implant phantom for quality assurance and scanner hardware and software assessment with limited resources. The phantom was successfully used in the assessment of the hardware and software performance of different CT scanners.

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