Microstructure and properties of CoCr alloys used in prosthetics procedure

2018 ◽  
Vol 1 (89) ◽  
pp. 20-26
Author(s):  
A. Ziębowicz ◽  
A. Woźniak ◽  
B. Ziębowicz ◽  
M. Adamiak ◽  
P. Boryło
Keyword(s):  
Comparative Research ◽  
New Technology ◽  
Laser Sintering ◽  
Manufacturing Technology ◽  
Chemical Compositions ◽  
Direct Metal Laser Sintering ◽  
Casting Technology ◽  
Cad Cam ◽  
Corrosion Pitting ◽  
Practical Implications

Purpose: The aim of this work was to define the influence of manufacturing technology on the chemical composition, surface topography, physicochemical and electrochemical properties of CoCr alloys obtained by casting technology and Direct Metal Laser Sintering. Design/methodology/approach: This work presents microstructural and chemical compositions obtained by scanning electron microscopy (SEM) and energy dispersive X-ray analysis (EDS). Additionally, corrosion pitting analysis and roughness measurement were conducted on the samples. Findings: On the basis of the investigations, it can be stated that the prosthetic restorations are different depending on the type manufacturing technology. Based on the obtained results it was found that the structures of both materials are chemically inhomogeneous. The investigated alloy exhibited similar polarization curve character. Practical implications: The rapid prototyping methods are a new technology used for getting details e.g. by CAD/CAM procedure. Using Direct Metal Laser Sintering (DMLS) method can simplify the technology of producing prosthetics restrictions and is an alternate way for standard casting technology. Originality/value: The paper presents comparative research of two Co-Cr alloys, from which the samples were obtained in conventional casting and DMLS technology.

An approach for negating the view that technology ‘competes’ with humans

Robotica ◽  
1987 ◽  
Vol 5 (3) ◽  
pp. 251-255 ◽  
Author(s):  
P. L. Primrose ◽  
R. Leonard
Keyword(s):  
Competitive Ability ◽  
Labour Force ◽  
New Technology ◽  
Industrial Relations ◽  
Manufacturing Technology ◽  
Advanced Manufacturing Technology ◽  
Advanced Manufacturing ◽  
Human Beings ◽  
Government Incentives ◽  
Cad Cam

SUMMARYEngineers have traditionally invested in Advanced Manufacturing Technology (AMT), such as FMS, Robots, CAD/CAM, CNC and MRP to achieve a reduction in the labour force. Similarly, government incentives for introducing AMT, have also placed an undue emphasis on the ‘need to replace labour with technology’. This policy creates severe industrial relations problems and leads to the view that technology, especially robots, ‘competes’ with human beings for employment. Research at U.M.I.S.T. has shown that AMT is much more viable when the objective of the investment is to increase a company's overall competitive ability, thereby generating increased sales which, in turn, necessitates an INCREASED labour force. The paper discusses various aspects of AMT and in each case it is shown how the acceptability of the investment is improved when the new technology is viewed ‘company-wide’. When this occurs, technology is viewed as being ‘complementary to’ and not ‘instead of’ humans.

scholarly journals МЕТОД СОЗДАНИЯ МОДЕЛЕЙ САМОЛЕТОВ С ПОМОЩЬЮ СИСТЕМ CAD/CAM/CAE И АДДИТИВНЫХ ТЕХНОЛОГИЙ

2018 ◽  
pp. 24-34
Author(s):  
Ю. Б. Витязев ◽  
А. Г. Гребеников ◽  
А. М. Гуменный ◽  
А. М. Ивасенко ◽  
А. А. Соболев
Keyword(s):  
Additive Manufacturing ◽  
Fused Deposition Modeling ◽  
Selective Laser Sintering ◽  
Laser Sintering ◽  
Additive Technologies ◽  
Direct Metal Laser Sintering ◽  
Fused Deposition ◽  
Cad Cam ◽  
Deposition Modeling ◽  
Laser Stereolithography

The analysis of the most applicable in mechanical engineering additive technologies (fused deposition modeling, selective laser sintering, laser stereolithography, direct metal laser sintering) have been performed. Method of creating airplane models using CAD/CAM/CAE systems and additive manufacturing is presented. The results of the application of selective laser sintering and fused deposition modeling for the manufacture of training aircraft models are considered.

STUDY OF THE IMPACT OF INCREMENTAL TECHNOLOGY ON MECHANICAL AND TRIBOLOGICAL PROPERTIES OF BIOMATERIALS

Tribologia ◽  
2018 ◽  
Vol 273 (3) ◽  
pp. 29-38
Author(s):  
Łukasz BOJKO ◽  
Wojciech RYNIEWICZ ◽  
Anna M. RYNIEWICZ ◽  
Marcin KOT
Keyword(s):  
Tribological Properties ◽  
New Technology ◽  
Direct Metal Laser Sintering ◽  
Percentage Composition ◽  
Mechanical And Tribological Properties ◽  
Cad Cam ◽  
Dental Applications ◽  
The Impact ◽  
Cocrmo Alloys ◽  
Cam Systems

The latest method for creating denture replenishment in CAD / CAM systems is Direct Metal Laser Sintering (DMLS) technology. With the use of DMLS, prosthodontics, implant prosthetics, and facial-cranialjaw surgery adapted to individual patient conditions can be realized. The aim is to evaluate the strength, microstructure, and tribological properties of Ti6Al4V and CoCrMo alloys obtained from DMLS technology in the aspect of therapeutic constructions. The conducted tests show that, in the DMLS technology, as compared to milling technology preceded by casting and forging or pressed powder and sintering, for the same percentage composition of elements, the micromechanical properties, microstructural and tribological change. This procedure, from which constructions for various dental applications are obtained, is the new technology preferred for making permanent restorations faced with ceramics, producing intravascular implants, and implants of the temporomandibular joint. It can be an alternative to conventional cast-based methods and CAD / CAM based milling.

Direct Metal Laser Sintering Strategies for Fabrication of Finer Resolution Cellular Structures

2020 ◽  
Author(s):  
Fatemeh Hejripour ◽  
Muhammad Abdus Salam ◽  
Gary L. Bowlin ◽  
Ebrahim Asadi
Keyword(s):  
Laser Sintering ◽  
Cellular Structures ◽  
Direct Metal Laser Sintering

scholarly journals The chemical composition and manufacturing technology of glass beads excavated from the Hetian Bizili site, Xinjiang

2020 ◽  
Vol 8 (1) ◽  
Author(s):  
Dong Wang ◽  
Rui Wen ◽  
Julian Henderson ◽  
Xingjun Hu ◽  
Wenying Li
Keyword(s):  
Glass Beads ◽  
Manufacturing Technology ◽  
Chemical Compositions ◽  
Raman Spectrometry ◽  
The West ◽  
Ancient Times ◽  
Southern Route ◽  
The Silk Road ◽  
Plant Ash ◽  
Lead Antimonate

AbstractThe Hetian Bizili site in Lop County, located on the southern route of the Silk Road in Xinjiang, China, was a trade and cultural hub between the East and the West in ancient times. In 2016, a large number of glass beads were unearthed from the 40 tombs excavated on this site. In this study we determined the chemical compositions and manufacturing technology of bodies and decorations of twelve glass beads from the M5 tomb of Bizili by using LA-ICP-AES, EDXRF, Raman Spectrometry, and SR-μCT. The chemical compositions of the beads were all Na2O–CaO–SiO2, with plant ash mainly used as a flux. Lead antimonate and lead stannate were used as the opacifying agents. We detected elevated levels of boron and high levels of phosphorus in some beads: this is discussed in the context of the type of flux used and the possible use of a P-rich opacifier. Some of the beads with high contents of aluminum may potentially come from Pakistan. In terms of manufacturing technology, the craftsmen made ‘eye’ beads in different ways and also trail decorated beads.

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