hard materials
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2022 ◽  
Author(s):  
Yi-Ming Lu ◽  
Yan-Zhao Duan ◽  
Xue-Qing Liu ◽  
Qi-Dai Chen ◽  
Hong-Bo Sun

Author(s):  
Jacob Hickey ◽  
Jakoah Brgoch

Ternary and higher-order borides remain an underexplored area in the search for hard materials. The difficulties associated with purely systematic experimental investigations have largely hindered the consideration of such complex...


Author(s):  
Naveen Vats

Abstract: Wire electrical release machining (WEDM) innovation has developed at special case rate since it was first applied over long term prior.WEDM is a widely recognized unconventional material cutting process used to manufacture components with complex shapes and profiles of hard materials. In this thermal erosion process, there is no physical contact between the wire tool and work materials. Wire Electrical Discharge Machining (WEDM) is getting more tasks in fields like dies, punches, aero and many more. It is the very difficult task to get optimum process parameters for higher cutting efficiency. In WEDM process rough machining gives lesser accuracy and finish machining gives fine surface finish, but it reduces the machining speed. This review involves process, principle, literature and applications of WEDM using Taguchi array. Keywords: WEDM; Materials; Machine; Cutting efficiency; Optimization process.


Materials ◽  
2021 ◽  
Vol 15 (1) ◽  
pp. 123
Author(s):  
Katarzyna Racka-Szmidt ◽  
Bartłomiej Stonio ◽  
Jarosław Żelazko ◽  
Maciej Filipiak ◽  
Mariusz Sochacki

The inductively coupled plasma reactive ion etching (ICP-RIE) is a selective dry etching method used in fabrication technology of various semiconductor devices. The etching is used to form non-planar microstructures—trenches or mesa structures, and tilted sidewalls with a controlled angle. The ICP-RIE method combining a high finishing accuracy and reproducibility is excellent for etching hard materials, such as SiC, GaN or diamond. The paper presents a review of silicon carbide etching—principles of the ICP-RIE method, the results of SiC etching and undesired phenomena of the ICP-RIE process are presented. The article includes SEM photos and experimental results obtained from different ICP-RIE processes. The influence of O2 addition to the SF6 plasma as well as the change of both RIE and ICP power on the etching rate of the Cr mask used in processes and on the selectivity of SiC/Cr etching are reported for the first time. SiC is an attractive semiconductor with many excellent properties, that can bring huge potential benefits thorough advances in submicron semiconductor processing technology. Recently, there has been an interest in SiC due to its potential wide application in power electronics, in particular in automotive, renewable energy and rail transport.


Instruments ◽  
2021 ◽  
Vol 5 (4) ◽  
pp. 39
Author(s):  
Lucio Anderlini ◽  
Marco Bellini ◽  
Chiara Corsi ◽  
Stefano Lagomarsino ◽  
Chiara Lucarelli ◽  
...  

Tracking detectors at future high luminosity hadron colliders are expected to be able to stand unprecedented levels of radiation as well as to efficiently reconstruct a huge number of tracks and primary vertices. To face the challenges posed by the radiation damage, new extremely radiation hard materials and sensor designs will be needed, while the track and vertex reconstruction problem can be significantly mitigated by the introduction of detectors with excellent timing capabilities. Indeed, the time coordinate provides extremely powerful information to disentangle overlapping tracks and hits in the harsh hadronic collision environment. Diamond 3D pixel sensors optimised for timing applications provide an appealing solution to the above problems as the 3D geometry enhances the already outstanding radiation hardness and allows to exploit the excellent timing properties of diamond. We report here the first full timing characterisation of 3D diamond sensors fabricated by electrode laser graphitisation in Florence. Results from a 270MeV pion beam test of a first prototype and from tests with a β source on a recently fabricated 55×55μm2 pitch sensor are discussed. First results on sensor simulation are also presented.


Author(s):  
Consuelo Mata Parreño ◽  
Lucía Soria Combadiera ◽  
Marta Blasco Martín ◽  
Elena Mora García ◽  
Mercedes Fuentes Albero ◽  
...  

The aim of this paper is to examine the craftwork on hard materials of animal origin from the Iron Age of the southeast of the Iberian Peninsula. We deal with the processes of craftsmanship, transmission of knowledge and the circulation of ivory combs and perforated bone plates. The Cultural Inheritance Theory offers a framework to help identify social dynamics in the craft productions and the transmission of the cultural knowledge between and among individuals (vertical, horizontal or oblique). Therefore, the consequences of these cultural transmission processes will be different for each artefact. This could be used to investigate relative levels of standardization within and between groups. For this we use various morphometric measurements related to the technological process of making combs and perforated plates. The results point to an oblique transmission with particularities linked to each object related to their formal and decorative characteristics and owing to their raw materials.


10.5852/nes04 ◽  
2021 ◽  
Author(s):  
Sophie Méry

This book illustrates fragments of the lives of past and present “nomadic” peoples, from Africa, Asia, North and South America and Europe, from different angles (habitats, material production, economic and territorial organisation, social organisation, rites and beliefs, art). This way of life prevailed for millions of years before another sedentary way of life gradually replaced it from 9,000 years ago onwards. However, nomads did not disappear. Today they are a minority and are often marginalised, but they are still an integral part of our humanity. This is the point of view we have adopted in Nomad Lives and we invite our readers to discover women, men and children from all sorts of geographical, climatic, sociological and even chronological horizons, all united by their nomadic lifestyle. This book contains nearly thirty contributions by archaeologists, ethnologists/anthropologists, sociologists, geographers, economists and historians. However, present-day nomads are not in any way considered as avatars of past nomads, any more than the nomads of today (or yesterday) would be representative of one and the same social and economic organisation, of one and the same relationship to the world. On the contrary, the diversity of the contributions gathered here underlines the plural character of this way of life. Being nomadic, living as a nomad, cannot be defined in a univocal way and throughout the pages a question emerges, simple in appearance but excessively complex in the reality of the peoples themselves and of researchers in human sciences: “What is it to be nomadic?” It is around this question that the book closes from the combined perspective of an archaeologist, an ethnologist and a sociologist. Aline Averbouh is an archaeologist, Senior Research fellow at the French National Centre for Scientific Research, specialist in prehistoric nomadic groups of the late Upper Palaeolithic and their production of hard materials of animal origin. She works in France but has also worked in Central Europe and South America (Argentina). She is a member of the UMR AASPE (MNHN Paris, France). Nejma Goutas is an archaeologist, Research fellow at the French National Centre for Scientific Research, specialist in prehistoric nomadic groups of the Early Upper Palaeolithic (Gravettian) in Europe and their production of hard materials of animal origin (France, Romania, Russia, Czech Republic, Belgium). She is a member of the “Prehistoric Ethnology” team, UMR ArScAN (Nanterre, France). Sophie Méry is an archaeologist, Research Director at the French National Centre for Scientific Research, she is a specialist in Neolithic and Bronze Age societies in Arabia and their ceramic production and Director of the French Archaeological Mission to the UAE. She is a member of UMR CReAAH (Rennes, France).


2021 ◽  
Author(s):  
ilknur Kars Durukan ◽  
Yasemin Oztekin Ciftci

Abstract In this study, to see pressure effects on optical, thermodynamic, structural, elastic, electronic properties, charge density, and phonon frequencies of the XAl (X:Rh, Ru) compounds in B2 structure, the first-principles methods were used. The ground-state properties of these compounds were determined and compared with experimental and theoretical data. High Young's and shear modulus showed these compounds to be hard materials. The investigated compounds have ductile property according to the Paugh criterion and Poisson’s ratio calculated from elastic constants. The electronic band structure showed that these compounds have a metallic nature. Dynamic stability using phonon distribution curves was determined under pressure. The bond properties between Rh-Al and Ru-Al atoms were evaluated in detail by Mulliken Atomic Populations and charge density analysis. Also, the optical properties are examined in detail. We think that this theoretical work contributes greatly to engineering applications due to the electronic, thermodynamic, and optical behavior of XAl (X: Rh, Ru) compounds.


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