Technological aspects of the formation, reproducibility and compliance of the parameters of film converters

2020 ◽  
pp. 71-75
Author(s):  
D.G. Mustafaeva ◽  
Keyword(s):  
Thin Films ◽  
Materials Science ◽  
Dissimilar Materials ◽  
Structural Elements ◽  
Technological Factors ◽  
Operating Modes ◽  
Microelectronic Technology ◽  
Semiconductor Compounds ◽  
Static And Dynamic Loads ◽  
Analysis And Study

The analysis and study of materials science and technological factors in the creation of film converters are carried out, the requirements for materials, their properties, and the technology of forming the converter elements are determined. It is shown that taking into account material science and technological factors ensures that the parameters of the film transducer match the required ones, resistance to external infiuencing factors, obtaining films of the initial composition, and stability of the production technology. The choice of material parameters is made taking into account the operating modes and conditions, static and dynamic loads acting on the elements of the converter, the properties of the starting materials and film elements. When joining dissimilar materials, the coefficients of linear expansion are taken into account. In the process of creating film converters, the initial materials, structural elements are processed in various technological environments and, are subjected to thermal effects, the specified structures and parameters of the film converter are formed, and at the same time, the imperfections in the initial materials and converter elements are amplified, which directly or indirectly affect the output parameters of the film converter. In the manufacture of film elements of the transducer, the choice of the method for producing thin films is determined by the purpose of the film, the compatibility of the method with other technological operations of microelectronic technology. The reproducibility of the electrophysical properties of thin films takes place during their deposition with a controlled composition, which is essential for the production of films based on semiconductor compounds and for the formation of the sensitive elements of the transducer. The analysis and study of methods for obtaining films showed that the energy efficiency of the process of ion sputtering of materials and the production of thin films of a given composition, technological fiexibility, the ability to control the thickness of the films by changing the current value, the deposition time and the pressure at which it is carried out are the most optimal.

Анализ и исследование материаловедческих и технологических факторов при создании пленочных преобразователей

2020 ◽  
Vol 13 (5) ◽  
pp. 304-307
Author(s):  
Д.Г. Мустафаева
Keyword(s):  
Thin Films ◽  
Materials Science ◽  
Dissimilar Materials ◽  
Operating Conditions ◽  
Structural Elements ◽  
Microelectronic Technology ◽  
Semiconductor Compounds ◽  
Static And Dynamic Loads ◽  
Expansion Coefficients ◽  
Technological Flexibility

Проведены анализ и исследование материаловедческих и технологических факторов при создании пленочных преобразователей, определены требования к материалам и их свойствам, технологии формирования элементов преобразователя. Показано, что учет материаловедческих и технологических факторов обеспечивает соответствие параметров пленочного преобразователя с требуемыми, устойчивость к внешним воздействующим факторам, получение пленок исходного состава, стабильность технологии производства. Выбор параметров материалов производится с учетом режимов и условий эксплуатации, статических и динамических нагрузок, действующих на элементы преобразователя, свойств исходных материалов и пленочных элементов. При сопряжении разнородных материалов учитывают коэффициенты линейного расширения. В процессе создания пленочных преобразователей исходные материалы, конструктивные элементы обрабатываются в различных технологических средах и подвергаются тепловым воздействиям, формируются заданные структуры и параметры пленочного преобразователя, и вместе с этим усиливаются несовершенства, имевшиеся в исходных материалах и элементах преобразователя, которые прямо или косвенно влияют на выходные параметры пленочного преобразователя. При изготовлении пленочных элементов преобразователя выбор метода получения тонких пленок определяется назначением пленки, совместимости метода с другими технологическими операциями микроэлектронной технологии. Воспроизводимость электрофизических свойств тонких пленок имеет место при их осаждении с контролируемым составом, что существенно при получении пленок на основе полупроводниковых соединений и формировании чувствительных элементов преобразователя. Анализ и исследования методов получения пленок показали, что энергетическая эффективность процесса ионного распыления материалов и получения тонких пленок заданного состава, технологическая гибкость, возможность регулирования толщины пленок путем изменения величины тока, времени осаждения и давления, при котором оно проводится, являются наиболее оптимальными. The analysis and research of material science and technological factors in the creation of film converters is carried out, the requirements for materials and their properties, the technology for the formation of converter elements are determined. It is shown that taking into account materials science and technology factors ensures that the parameters of the film converter meet the required parameters, resistance to external factors, obtaining films of the original composition, and stability of the production technology. The choice of material parameters is made taking into account operating conditions and conditions, static and dynamic loads acting on the converter elements, the properties of the starting materials and film elements. When pairing dissimilar materials, linear expansion coefficients are taken into account. In the process of creating film converters, the starting materials, structural elements are processed in various technological environments and exposed to thermal influences, the specified structures and parameters of the film converter are formed, and at the same time, the imperfections in the starting materials and converter elements are amplified, which directly or indirectly affect the output parameters film converter. In the manufacture of film elements of the converter, the choice of the method for producing thin films is determined by the purpose of the film, the compatibility of the method with other technological operations of microelectronic technology. The reproducibility of the electrophysical properties of thin films takes place when they are deposited with a controlled composition, which is essential when producing films based on semiconductor compounds and the formation of sensitive elements of the transducer. Analysis and research of methods for producing films showed that the energy efficiency of the process of ion sputtering of materials and the production of thin films of a given composition, technological flexibility, the ability to control the thickness of the films by changing the current, deposition time and pressure at which it is carried out, are the most optimal.

Ultrasonic Torsion Welding of Aging Resistant Al/CFRP Joints - Concepts, Mechanical and Microstructural Properties

2017 ◽  
Vol 742 ◽  
pp. 395-400 ◽  
Author(s):  
Florian Staab ◽  
Frank Balle ◽  
Johannes Born
Keyword(s):  
Mechanical Properties ◽  
Process Parameters ◽  
Materials Science ◽  
Dissimilar Materials ◽  
Material Design ◽  
Ultrasonic Welding ◽  
Fatigue Properties ◽  
Aviation Industry ◽  
Efficient Design ◽  
Engineering Structures

Multi-material-design offers high potential for weight saving and optimization of engineering structures but inherits challenges as well, especially robust joining methods and long-term properties of hybrid structures. The application of joining techniques like ultrasonic welding allows a very efficient design of multi-material-components to enable further use of material specific advantages and are superior concerning mechanical properties.The Institute of Materials Science and Engineering of the University of Kaiserslautern (WKK) has a long-time experience on ultrasonic welding of dissimilar materials, for example different kinds of CFRP, light metals, steels or even glasses and ceramics. The mechanical properties are mostly optimized by using ideal process parameters, determined through statistical test planning methods.This gained knowledge is now to be transferred to application in aviation industry in cooperation with CTC GmbH and Airbus Operations GmbH. Therefore aircraft-related materials are joined by ultrasonic welding. The applied process parameters are recorded and analyzed in detail to be interlinked with the resulting mechanical properties of the hybrid joints. Aircraft derived multi-material demonstrators will be designed, manufactured and characterized with respect to their monotonic and fatigue properties as well as their resistance to aging.

scholarly journals Strain-stabilized superconductivity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. P. Ruf ◽  
H. Paik ◽  
N. J. Schreiber ◽  
H. P. Nair ◽  
L. Miao ◽  
...  
Keyword(s):  
Thin Films ◽  
Materials Science ◽  
Condensed Matter ◽  
Quantum States ◽  
Low Energy ◽  
Superconducting Transition ◽  
Superconducting Properties ◽  
Detailed Understanding ◽  
Epitaxial Strain ◽  
Promising Strategy

AbstractSuperconductivity is among the most fascinating and well-studied quantum states of matter. Despite over 100 years of research, a detailed understanding of how features of the normal-state electronic structure determine superconducting properties has remained elusive. For instance, the ability to deterministically enhance the superconducting transition temperature by design, rather than by serendipity, has been a long sought-after goal in condensed matter physics and materials science, but achieving this objective may require new tools, techniques and approaches. Here, we report the transmutation of a normal metal into a superconductor through the application of epitaxial strain. We demonstrate that synthesizing RuO2 thin films on (110)-oriented TiO2 substrates enhances the density of states near the Fermi level, which stabilizes superconductivity under strain, and suggests that a promising strategy to create new transition-metal superconductors is to apply judiciously chosen anisotropic strains that redistribute carriers within the low-energy manifold of d orbitals.

The Materials Science of “Permeable Polysilicon” Thin Films

2001 ◽  
Vol 687 ◽  
Author(s):  
George M Dougherty ◽  
Timothy Sands ◽  
Albert P. Pisano
Keyword(s):  
Thin Films ◽  
Residual Stress ◽  
Materials Science ◽  
Single Step ◽  
Process Window ◽  
Silicon Thin Films ◽  
Growth Regime ◽  
Deposition Parameters ◽  
Simple Kinetic Model ◽  
The Relationship

AbstractPolycrystalline silicon thin films that are permeable to fluids, known as permeable polysilicon, have been reported by several researchers. Such films have great potential for the fabrication of difficult to make MEMS structures, but their use has been hampered by poor process repeatability and a lack of physical understanding of the origin of film permeability and how to control it. We have completed a methodical study of the relationship between process, microstructure, and properties for permeable polysilicon thin films. As a result, we have determined that the film permeability is caused by the presence of nanoscale pores, ranging from 10-50 nm in size, that form spontaneously during LPCVD deposition within a narrow process window. The unusual microstructure within this process window corresponds to the transition between a semicrystalline growth regime, exhibiting tensile residual stress, and a columnar growth regime exhibiting compressive residual stress. A simple kinetic model is proposed to explain the unusual morphology within this transition regime. It is determined that measurements of the film residual stress can be used to tune the deposition parameters to repeatably produce permeable films for applications. The result is a convenient, single-step process that enables the elegant fabrication of many previously challenging structures.

Surface and Shape Deposition Manufacturing for the Fabrication of a Curved Surface Gripper

2015 ◽  
Vol 7 (2) ◽  
Author(s):  
Srinivasan A. Suresh ◽  
David L. Christensen ◽  
Elliot W. Hawkes ◽  
Mark Cutkosky
Keyword(s):  
Thin Films ◽  
Laser Cutting ◽  
Biological Systems ◽  
Robotic Systems ◽  
Curved Surfaces ◽  
Structural Elements ◽  
Hard Materials ◽  
Subtractive Manufacturing ◽  
Multiple Materials ◽  
Shape Deposition Manufacturing

Biological systems such as the gecko are complex, involving a wide variety of materials and length scales. Bio-inspired robotic systems seek to emulate this complexity, leading to manufacturing challenges. A new design for a membrane-based gripper for curved surfaces requires the inclusion of microscale features, macroscale structural elements, electrically patterned thin films, and both soft and hard materials. Surface and shape deposition manufacturing (S2DM) is introduced as a process that can create parts with multiple materials, as well as integrated thin films and microtextures. It combines SDM techniques, laser cutting and patterning, and a new texturing technique, surface microsculpting. The process allows for precise registration of sequential additive/subtractive manufacturing steps. S2DM is demonstrated with the manufacture of a gripper that picks up common objects using a gecko-inspired adhesive. The process can be extended to other integrated robotic components that benefit from the integration of textures, thin films, and multiple materials.

scholarly journals Using a Core Scientific Metadata Model in Large-Scale Facilities

2010 ◽  
Vol 5 (1) ◽  
pp. 106-118 ◽  
Author(s):  
Brian Matthews ◽  
Shoaib Sufi ◽  
Damian Flannery ◽  
Laurent Lerusse ◽  
Tom Griffin ◽  
...  
Keyword(s):  
Large Scale ◽  
Materials Science ◽  
Production Quality ◽  
Scientific Study ◽  
Quality Data ◽  
Structural Elements ◽  
Metadata Model ◽  
The Core ◽  
Future Developments ◽  
The Relationship

In this paper, we present the Core Scientific Metadata Model (CSMD), a model for the representation of scientific study metadata developed within the Science & Technology Facilities Council (STFC) to represent the data generated from scientific facilities. The model has been developed to allow management of and access to the data resources of the facilities in a uniform way, although we believe that the model has wider application, especially in areas of “structural science” such as chemistry, materials science and earth sciences. We give some motivations behind the development of the model, and an overview of its major structural elements, centred on the notion of a scientific study formed by a collection of specific investigations. We give some details of the model, with the description of each investigation associated with a particular experiment on a sample generating data, and the associated data holdings are then mapped to the investigation with the appropriate parameters. We then go on to discuss the instantiation of the metadata model within a production quality data management infrastructure, the Information CATalogue (ICAT), which has been developed within STFC for use in large-scale photon and neutron sources. Finally, we give an overview of the relationship between CSMD, and other initiatives, and give some directions for future developments.    

Analysis and Study of Characteristic FTIR Absorption Peaks in Hafnium Oxide Thin Films Deposited at Low-Temperature

2019 ◽  
Vol 21 (1) ◽  
pp. 68-73
Author(s):  
Rafael A. Salinas Domínguez ◽  
Abdu Orduña-Díaz ◽  
Sonia Cerón ◽  
Miguel A. Dominguez
Keyword(s):  
Thin Films ◽  
Low Temperature ◽  
Hafnium Oxide ◽  
Oxide Thin Films ◽  
Analysis And Study

scholarly journals Structural and Magnetoresistance Properties of Transfer-Free Amorphous Carbon Thin Films

Crystals ◽  
2019 ◽  
Vol 9 (3) ◽  
pp. 124
Author(s):  
Awais Saleemi ◽  
Ali Abdullah ◽  
Muhammad Saeed ◽  
M. Anis-ur-Rehman ◽  
Ayyaz Mahmood ◽  
...  
Keyword(s):  
Thin Films ◽  
Amorphous Carbon ◽  
Materials Science ◽  
Physical Property Measurement System ◽  
Chemical Vapor ◽  
Physical Property ◽  
Interesting Phenomenon ◽  
Sio2 Substrate ◽  
Carbon Thin Films ◽  
Cost Efficient

The control of the morphologies and thus the optical, electrical, and magnetic effect of 2D thin films is a challenging task for the development of cost-efficient devices. In particular, the angular dependent magnetoresistance (MR) of surface thin films up to room temperature is an interesting phenomenon in materials science. Here, we report amorphous carbon thin films fabricated through chemical vapor deposition at a SiO2 substrate. Their structural and angular magnetoresistance properties were investigated by several analytical tools. Specifically, we used a physical property measurement system to estimate the magnitude of the angular MR of these as-prepared sample thin films from 2 K to 300 K. An angular MR magnitude of 1.6% for the undoped a-carbon thin films was found up to 300 K. Under the magnetic field of 7 T, these films possessed an angular MR of 15% at a low temperature of 2 K. A high disorder degree leads to a large magnitude of MR. The grain boundary scattering model was used to interpret the mechanism of this angular MR.

scholarly journals Cavitation in swirling flows of hydraulic spillways

2019 ◽  
Vol 91 ◽  
pp. 07022
Author(s):  
Genrikh Orekhov
Keyword(s):  
Flow Rate ◽  
Vortex Flow ◽  
Structural Elements ◽  
Flow Energy ◽  
Operating Modes ◽  
Swirl Angle ◽  
Energy Dissipators ◽  
High Head ◽  
The Impact

During operation of high-head hydraulic spillway systems, cavitation phenomena often occur, leading to destruction of structural elements of their flow conductor portions. The article is devoted to the study of erosion due to cavitation in the circulation flows of eddy hydraulic spillways, including those equipped with counter-vortex flow energy dissipators. Cavitation destructive effects depend on many factors: intensity consisting in the rate of decrease in the volume or mass of a cavitating body per unit of time, the stage of cavitation, geometric configuration of the streamlined body, the content of air in water, the flow rate, the type of material. The objective of the study consisted in determination of cavitation impacts in circulating (swirling) water flows. The studies were conducted by a method of physical modeling using high-head research installations. Distribution of amplitudes of pulses of shock cavitation impact is obtained according to the frequency of their occurrence depending on the flow velocity, the swirl angle, the height of the cavitating drop wall and the stage of cavitation. The impact energy depending on the stage of cavitation and the flow rate is given for different operating modes of the counter-vortex flow energy dissipators of a hydraulic spillway. In the conclusions, it is noted that cavitation impacts in the circulation flows occur mainly inside the flow, which is a fundamental difference from similar processes in axial flows.

Characterization of Thin Organic and Polymeric Films by Spectroscopic Methods

MRS Bulletin ◽  
1987 ◽  
Vol 12 (8) ◽  
pp. 39-41 ◽  
Author(s):  
J.F. Rabolt
Keyword(s):  
Thin Films ◽  
Structural Integrity ◽  
Materials Science ◽  
Molecular Level ◽  
Polymeric Films ◽  
Organic Films ◽  
Semiconductor Films ◽  
Intimate Contact ◽  
The Individual

Much of the anisotropic mechanical and thermal behavior exhibited by materials can be attributed to anisotropic orientation at the molecular level. In self-supporting thin films (5–10 microns) and those (0.01–1.0 microns) deposited on solid substrates, the role of molecular orientation is even more important since it will critically determine their two-dimensional behavior and their structural integrity as well. These two aspects are extremely important because if thin organic and polymeric films are to be competitive with existing materials for such diverse applications1 as chemical sensors and integrated optics, they must be mechanically robust and, ideally, defect free. These stringent constraints dictate that sophisticated characterization techniques, which can interrogate at the molecular level, be developed or refined so as to have the sensitivity to address these critical issues.The development of nondestructive techniques for studying thin organic films has certainly lagged behind those developed for metallic and semiconductor films. Unfortunately, many of these same techniques cannot be simply applied to organic films because they are “invasive” and often alter the structure of the system they were designed to probe. This is especially so in organic and polymer films, and this awareness within the materials science community has led to the adaptation of many photon intensive techniques to the study of thin films. A number of these will be discussed in later sections with their relative merit put in perspective.Certainly the origins of anisotropic structure in bulk materials are manyfold, but the spatial constraints in 2-D can lead to even more complex causes of orientation. In thin films on substrates the role of the surface is important in determining the ordering and orientation of the individual molecular segments which come into intimate contact with it. The extent of this orientation and order is still somewhat controversial but there is general agreement that it probably differs depending on the nature of the substrate.

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