1,787,377 research outputs found
Feature Papers in Extractive Metallurgy
No full textExtractive metallurgy deals with the processes for the recovery of valuable metals from ores and concentrates (primary metallurgy) or waste raw materials such as slags, slime, and flying ashes (recycling or secondary metallurgy). Regarding the type of obtained metals, these processes are divided into five different groups: extractive metallurgy of iron and steel, non-ferrous extractive metallurgy, extractive metallurgy of precious metals, extractive metallurgy of rare earth elements, and refractory metal extractive metallurgy. These processes in extractive metallurgy include unit processes for separating highly pure metals from undesirable metals in an economically efficient system. Extractive metallurgy is based on unit metallurgical operations that are usually separated into three categories: 1) hydrometallurgy (leaching, mixing, neutralization, precipitation, cementation, and crystallization); 2) pyrometallurgy (roasting and smelting); and 3) electrometallurgy (aqueous electrolysis and molten salt electrolysis)
Metallurgy of armour exhibited at the Palace Armoury, Valletta, Malta
Get PDFThe metallurgy of ten armour pieces from the Palace Armoury Collection in Malta was examined. Results showed that out of ten artefacts examined, six were produced in low carbon steel, one from a high carbon steel and three were made from wrought iron. One of the wrought iron armour pieces was fabricated from a phosphoric iron, an unusual material for these artefacts. All the steel artefacts exhibited a ferrite-pearlite microstructure. In their manufacture, no attempts had been made at producing martensite by full or slack quenching. All metal fragments contained slag inclusions. The elongated nature of the latter suggested that these artefacts were forged into shape.peer-reviewe
POWDER-METALLURGY RESEARCH AT RIST AND POSTECH, KOREA
No full textIn spite of a relatively short history, the powder metallurgy (P/M) program at RIST and POSTECH involves extensive research and development on powder processing technology including metal powder production on a pilot plant scale and the synthesis of new materials via the P/M route. The major research interest in P/M lies in developing rapidly solidified structural materials and the related fabrication and processing technology. With the emphasis on its founding philosophy promoting close cooperation among industry, university and research centers, RIST/POSTECH has developed extensive collaborations with industries including POSCO and has continued to play a leading role in the Korean P/M community.X11sci
Powder Metallurgy
Get PDFFrom high-performance, economical and environmental points of view, Powder metallurgy process shows remarkable advantages in production of parts and components due to their special compositions by elemental mixing and 3-dimensional near net shape forming methods. Powder metallurgy process can be applied to not only metal materials but also ceramics and organic materials, which both are employed as structural and electrical products. Author contributions to Powder metallurgy present excellent and significantly important research topics to evaluate various properties and performance of P/M materials for applying these materials as actual components. In particular, the life estimation of P/M ferrous materials by sliding contact fatigue test and tribological performance evaluation of P/M semi-metallic materials are focused and introduced in this book
Physical Metallurgy and Advanced Materials Physical Metallurgy and Advanced Materials
No full textPhysical Metallurgy and Advanced Materials, Seventh Edition, discusses the fundamental principles of metallurgy and materials science. The present volume emerged from earlier editions of Modern Physical Metallurgy (1962, 1970, 1985) and later editions of Modern Physical Metallurgy and Materials Engineering (1995, 1999). Presentations and content have been updated, and each chapter ends with a set of questions to enable readers to apply the scientific concepts presented in the chapter, as well as emphasize important material properties. Topics covered include atoms and atomic arrangements, phase equilibria and structure, crystal defects, characterization and analysis of materials, and physical and mechanical properties of materials. The chapters also examine the properties of materials, such as advanced alloys, ceramics, glass, polymers, plastics, composites, biomaterials, sports materials, and nanomaterials. Key Features: * Renowned coverage of metals and alloys, plus other materials classes including ceramics and polymers. *Updated coverage of sports materials, biomaterials and nanomaterials. *Covers new materials characterization techniques, including scanning tunneling microscopy (STM), atomic force microscopy (AFM), and nanoindentation. *Easy to navigate with contents split into logical groupings: fundamentals, metals and alloys, nonmetals, processing and applications. *Detailed worked examples with real-world applications. *Rich pedagogy includes extensive homework exercises, lecture slides and full online solutions manual (coming
Coarse powder metallurgy.
No full textThesis: B.S., Massachusetts Institute of Technology, Department of Metallurgy, 1966Bibliography: leaf 37.B.S.B.S. Massachusetts Institute of Technology, Department of Metallurg
Microwave-assisted preparation of multi principal element alloys by powder metallurgy approach
Get PDFAccording to literature, the synthetic route to produce High entropy alloys (HEAs) should guarantee short alloying time, efficient cooling and capability to operate in controlled atmosphere. Such conditions can be achieved using high frequency electromagnetic fields, like microwave heating. In this work FeCoNiCrAl and FeCoNiCuAl, both equiatomic and reinforced by the 10% wt. of SiC were prepared by microwave assisted techniques. Results show that direct microwave heating of the powder precursors occurs, until the ignition conditions are reached. The temperature and duration of the microwave-assisted process result much lower than other conventional powder metallurgy routes, but at the cost of a higher residual porosity. Sample characterization confirmed that the powder metallurgy approach is suitable to retain the shape of the load imparted during forming by uniaxial pressing. The homogeneity of the samples resulted in being good in all cases, without the dendritic segregation typically occurring by liquid phase processing. © 2017 European Powder Metallurgy Association (EPMA
A knowledge-based system for powder metallurgy technology
No full textPublished as part of the highly successful Engineering Research Series , A Knowledge–Based System for Powder Metallurgy Technology not only looks at the latest advances in powder metallurgy, but also presents a methodology that offers a means to preserve critical process–related know–how. The author makes this practical information easily accessible to design engineers so that they can take advantage of the opportunities that powder metallurgy offers. The knowledge–based system aims to simulate the capability of human experts in solving design, materials, and process optimization problems in powder metallurgy. This is achieved through use of process modelling and artificial intelligence techniques such as neural networks. The rapid developments in expert systems in recent years have enabled accumulated experience and knowledge to be applied in the powder metallurgy field. This calls for careful modelling of the processes together with sound appreciation of both powder metallurgy and knowledge–based systems. A Knowledge–based System for Powder Metallurgy Technology introduces the reader to both fields in the early chapters and then illustrates the advantages of the use of expert systems in this significant manufacturing process. A Knowledge–based System for Powder Metallurgy Technology is based upon the author’s extensive experience of computing, expert systems, modelling and powder metallurgy on both sides of the Atlantic and represents a valuable addition to the Engineering Research Series
Fundamentals of magnesium alloy metallurgy
No full textMagnesium and magnesium alloys offer a wealth of valuable properties, making them of great interest for use across a wide range of fields. This has led to extensive research focused on understanding the properties of magnesium and how these can be controlled during processing. Fundamentals of magnesium alloy metallurgy presents an authoritative overview of all aspects of magnesium alloy metallurgy, including physical metallurgy, deformation, corrosion and applications. Beginning with an introduction to the primary production of magnesium, the book goes on to discuss physical metallurgy of magnesium and thermodynamic properties of magnesium alloys. Further chapters focus on understanding precipitation processes of magnesium alloys, alloying behaviour of magnesium, and alloy design. The formation, corrosion and surface finishing of magnesium and its alloys are reviewed, before Fundamentals of magnesium alloy metallurgy concludes by exploring applications across a range of fields. Aerospace, automotive and other structural applications of magnesium are considered, followed by magnesium-based metal matrix composites and the use of magnesium in medical applications. © 2013 Woodhead Publishing Limited. All rights reserved
The Friction And Wear Characteristic Of Fe-based P/M Materials In Scroll Compressor
Get PDFWith the development of materials science and technology, Iron-based powder metallurgy (P/M) antifriction materials gradually used to scroll compressor. In this paper, three kinds of Iron-based powder metallurgy antifriction materials, which are Fe-C-Cu, Fe-C-Cu-Ni-Mo and Fe-P were prepared by the common compacting sintering method. Microstructure and mechanical properties were studied, tribological properties were tested on the friction tester, and surface topographical characteristics and wear mechanism of the Iron-based powder metallurgy materials antifriction were observed and analyzed by scanning electron microscope (SEM). The results showed that, the strength of Fe-C-Cu and Fe-C-Cu-Ni-Mo are higher than Fe-P. The microstructure of Fe-C-Cu and Fe-C-Cu-Ni-Mo are mainly composed of pearlite, Fe-P is ferrite. The impact toughness of Fe-P is better than the other two. Compared the tribological properties of aluminum alloys YZAlSi11Cu3 and powder metallurgy antifriction materials under oil lubrication condition, Fe-C-Cu and Fe-C-Cu-Ni-Mo have excellent wear resistance. The wear rate of Fe-C-Cu-Ni-Mo is equivalent to one sixth of YZAlSi11Cu3. The wear mechanism of YZAlSi11Cu3 was deformation and adhesion. Powder metallurgy antifriction materials were dominated by fatigue and deformation, and accompanied by a small amount of abrasive wear
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