scholarly journals A Novel Technique for Controllable Fabrication of Multilayer Copper/Brass Block

Coatings ◽  
2021 ◽  
Vol 11 (11) ◽  
pp. 1416
Author(s):  
Jiansheng Li ◽  
Zhongchen Zhou ◽  
Tong Liu ◽  
Yu Zhao ◽  
Yan Lu ◽  
...  
Keyword(s):  
Layer Thickness ◽  
Raw Materials ◽  
Rolling Process ◽  
Utilization Efficiency ◽  
Diffusion Welding ◽  
Multilayered Structures ◽  
Controllable Fabrication ◽  
Final Rolling ◽  
Metal Block ◽  
Controllable Layer

Fabricating a dissimilar-metal block with micro/nano-multilayered structures is usually used by engineers and scientists because of their excellent mechanical properties. In the current work, multilayered copper/brass blocks were effectively fabricated by a synthetical DWFR technique, which includes the processes of diffusion welding, forging and rolling. Diffusion welding was used as the first operation to metallurgically bond the copper and brass sheets, with a Zn diffusion transition layer (thickness of ~100 μm), which can guarantee the bonding strength of copper/brass interfaces during the subsequent forging and rolling processes. After diffusion welding, the original copper/brass blocks were required to be forged, with its total thickness reduced to ~10 mm. This can further restrain the delamination of copper and brass layers during the final rolling process. Rolling was utilized as the ideal operation that can precisely tune the thickness of copper/brass laminate. This novel DWFR technique can easily tune the multilayered copper/brass blocks with controllable layer thickness (from ~250 to ~800 nm). The copper/brass interfaces were well-bonded, and the utilization efficiency of raw materials was very high (>95%).

scholarly journals АДАПТИВНИЙ МОНІТОРИНГ СТРАТЕГІЙ ФОРМУВАННЯ АНТИКРИЗОВОГО ПОТЕНЦІАЛУ

2019 ◽  
Vol 131 (1) ◽  
pp. 39-48
Author(s):  
Сергій Олегович Ареф’єв
Keyword(s):  
Adaptive Management ◽  
Environmental Sustainability ◽  
Management Practices ◽  
Raw Materials ◽  
Management Strategies ◽  
Utilization Efficiency ◽  
Corporate Structure ◽  
Local Case ◽  
Adaptive Monitoring ◽  
Wide Range

The paper covers the current issues of counteraction to constantly arising crisis phenomena in the process of using the enterprise potential. For about 15 years the efforts to comply with legislation have been steadily rising, and more and more emphasis is paid to various aspects of corporate social responsibility. There is a wide range of activities, such as increasing employee awareness, creating a management system to prevent abrupt changeover, a solid corporate structure and timely disclosure of information, as well as managing the organization as an integration of its potentials. Adaptive monitoring is viewed as a critical component in finding and controlling the reserves for further utilization of enterprise resources in the context of developing its long-term strategies. Building the subsystems for change management strategies can form the basis for creating anti-crisis potential. However, there is another barrier to the process of adaptation which is a vulnerable internal environment. Apparently, the goals of the chosen strategies in each of the business areas are not always announced, and this can increase the entropy level within the enterprise, creating threats and hazards that give rise to crisis phenomena. From a dynamic perception, adaptive management concept involves the construction of a decomposition of its possible implementation scenarios subject to the type of threats to enterprise performance and characteristics of its potentials. The search for the development models that can retain the enterprise resources is a fundamental challenge for its operation in the future. It is about facilitating the transition from product economy to the system economy, from a dissipative approach to resources to an adaptive management practices, to a cultural leap towards economic and environmental sustainability that should affect the entire society, from strengthening of the territory and cooperation among all stakeholders to gain the resource utilization efficiency beyond renewable energy, starting with raw materials and local waste management to create an integrated technology network and from a number of integrated technologies, from deindustrialized territories reconstruction towards new relationships between agriculture, industry and academia, conducting local case studies to test the effects of innovations, thus boosting the process of transforming the research results into new pilot projects.

scholarly journals Optimization of Tubular Microalgal Photobioreactors with Spiral Ribs under Single-Sided and Double-Sided Illuminations

Processes ◽  
2019 ◽  
Vol 7 (9) ◽  
pp. 619 ◽  
Author(s):  
Lei ◽  
Wang ◽  
Wu
Keyword(s):  
Relative Position ◽  
High Efficiency ◽  
Raw Materials ◽  
Incident Light ◽  
Clean Energy ◽  
Point Of View ◽  
Utilization Efficiency ◽  
Cycle Frequency ◽  
Algal Suspension ◽  
Rib Structure

Microalgae can be raw materials for the production of clean energy and have great potential for development. The design of the microalgal photobioreactor (PBR) affects the mixing of the algal suspension and the utilization efficiency of the light energy, thereby affecting the high-efficiency cultivation of the microalgae. In this study, a spiral rib structure was introduced into a tubular microalgal PBR to improve the mixing performance and the light utilization efficiency. The number of spiral ribs, the inclination angle, and the velocity of the algal suspension were optimized for single-sided and double-sided parallel light illuminations with the same total incident light intensity. Next, the optimization results under the two illumination modes were compared. The results showed that the double-sided illumination did not increase the average light/dark (L/D) cycle frequency of the microalgae particles, but it reduced the efficiency of the L/D cycle enhancement. This outcome was analyzed from the point of view of the relative position between the L/D boundary and the vortex in the flow field. Finally, a method to increase the average L/D cycle frequency was proposed and validated. In this method, the relative position between the L/D boundary and the vortex was adjusted so that the L/D boundary passed through the central region of the vortex. This method can also be applied to the design of other types of PBRs to increase the average L/D cycle frequency.

Optical properties of aperiodic multilayered structures with equal geometric layer thickness

Optik ◽  
2013 ◽  
Vol 124 (19) ◽  
pp. 3946-3948 ◽  
Author(s):  
P.V. Korolenko ◽  
A.Y. Mishin ◽  
Yu. V. Ryzhikova
Keyword(s):  
Optical Properties ◽  
Layer Thickness ◽  
Multilayered Structures

Process Design on Baogang 2250mm Hot Rolling Project

2013 ◽  
Vol 744 ◽  
pp. 283-287
Author(s):  
Lin Li ◽  
Fu Ming Zhang ◽  
Hong Wen Liu ◽  
Ruo Yu Zang ◽  
Fan Wang
Keyword(s):  
Hot Rolling ◽  
Process Design ◽  
Raw Materials ◽  
International Standards ◽  
Design Flow ◽  
Utilization Efficiency ◽  
High Quality ◽  
Flow Process ◽  
Production Scale ◽  
Starting Point

Based on scale and output, process design assures high-end products for Baogang, ensures advancement and reliability of devices, enhances Chinese split supply ratio; ability to decrease investment and implement sustainable scientific outlook on development. To introduce production scale and product scheme in Baogang 2250mm hot rolling project, and illustrate design flow, process arrangement and equipment level. Ability to insist on a high starting point, reference to international standards, use advanced devices in order to meet high-quality needs and achieve strong competitiveness, adhere to strategy of sustainable development, improve on utilization efficiency of raw materials, energy and water, accomplish cyclic utilization. Leading products are high-quality rare-earth auto plates, steel sheets for home electrical appliances. The layout of plant is tightly linked with process design and whole plan, short process, smooth logistics, less middle stages and advanced automatic control system create international level in 21st century.

Chitosan–silane sol–gel hybrid thin films with controllable layer thickness and morphology

2013 ◽  
Vol 93 (1) ◽  
pp. 285-290 ◽  
Author(s):  
Stefan Spirk ◽  
Gerald Findenig ◽  
Ales Doliska ◽  
Victoria E. Reichel ◽  
Nicole L. Swanson ◽  
...  
Keyword(s):  
Thin Films ◽  
Layer Thickness ◽  
Sol Gel ◽  
Hybrid Thin Films ◽  
Controllable Layer

An Adaptive Memetic Algorithm for Packing Problems of Irregular Shapes

2011 ◽  
Vol 314-316 ◽  
pp. 1029-1033
Author(s):  
Yu Yu Zhou ◽  
Yun Qing Rao ◽  
Guo Jun Zhang ◽  
Chao Yong Zhang
Keyword(s):  
Local Search ◽  
Memetic Algorithm ◽  
Raw Materials ◽  
Packing Problem ◽  
Search Method ◽  
Utilization Efficiency ◽  
Furniture Industry ◽  
Packing Problems ◽  
Irregular Shapes ◽  
Material Utilization

Packing problem, which occurs frequently in sheet metal, clothing and furniture industry, cut product patterns from raw materials most efficiently and maximize material utilization. In this paper, an adaptive memetic algorithm is proposed to solve the problem of irregular shapes packed on the rectangular sheets. First, operators and parameters of evolution is researched, and second, local search method is proposed. Finally, this study compares benchmarks presented by other authors. The results show that the material utilization efficiency by using the adaptive memetic algorithm is higher compared to other methods.

scholarly journals Perancangan Mekanisme Pelurusan Kawat SAE 304 (UNS S30400) Galvanized Menggunakan Prinsip Pengerolan

2021 ◽  
Vol 5 (2) ◽  
pp. 1-7
Author(s):  
Herman Susanto ◽  
Sunardi Tjandra
Keyword(s):  
Plastic Deformation ◽  
Raw Materials ◽  
Rolling Force ◽  
Rolling Process ◽  
Empirical Method ◽  
Basic Process ◽  
Roll Bending ◽  
Small Industry ◽  
Rolling Method ◽  
Vertical Gap

Wire is a complement material on the manufacturing product. Therefore, the wire processes usually bestowed to the middle-low industry. Cutting and straightening wire processes are the most basic process for wire materials. In the middle-small industry, demand of wire materials is 150 kg per day. Seeing this potential, the design of a wire straightening mechanism for middle-low industries is necessary to maximize productivity. The main purpose of wire straightening mechanism design is calculating roll diameters and placement to obtain appropriate rolling force. In designing this wire straightening mechanism, the raw materials are used 3 mm SAE 304 (UNS S30400) Galvanized. The rolling method used in this mechanism is Three-Roll Bending. The empirical method is used on this analysis. Based on the analytical results, roll used on this mechanism are 5 pieces or equal with 3 cycle of rolling process with 40 mm of diameters. The vertical gap between center of rolls is 41.5 mm with 54 mm horizontal gap. Rolling force produced by the analytical roll dimension is 1608.69 N/cycle and that’s enough to give plastic deformation on the 3 mm SAE 304 (UNS S30400) Galvanized wire.

scholarly journals Microstructures and Mechanical Properties of Sputtered Cu/Cr Multilayers

1997 ◽  
Vol 505 ◽  
Author(s):  
A. Misra ◽  
H. Kung ◽  
T. E. Mitchell ◽  
T. R. Jervis ◽  
M. Nastasi
Keyword(s):  
Mechanical Properties ◽  
Orientation Relationship ◽  
Layer Thickness ◽  
Room Temperature ◽  
Multilayered Structures ◽  
Si Substrates ◽  
Grain Sizes ◽  
Microstructures And Mechanical Properties ◽  
Columnar Grain ◽  
Small Shear

ABSTRACTThe microstructures and mechanical properties of Cu/Cr multilayers prepared by sputtering onto {100} Si substrates at room temperature are presented. The films exhibit columnar grain microstructures with nanoscale grain sizes. The interfaces are planar and abrupt with no intermixing, as expected from the phase diagram. The multilayers tend to adopt a Kurdjumov- Sachs (KS) orientation relationship: {110}Cr //{111}Cu, <111>Cr //<110>Cu. The hardness of the multilayered structures, as measured by nanoindentation, increase with decreasing layer thickness for layer thicknesses ranging from 200 nm to 50 nm, whereas for lower thicknesses the hardness of the multilayers is independent of the layer thickness. Dislocation-based models are used to interpret the variation of hardness with layer periodicity. The possible effects of factors such as grain size within the layers, density and composition of films and residual stress in the multilayers are highlighted. Comparisons are made to the mechanical properties of sputtered polycrystalline Cu/Nb multilayers which, like Cu/Cr, exhibit sharp fcc/bcc interfaces with no intermixing and a KS orientation relationship, but have a small shear modulus mismatch.

Process Modeling of Shape Rolling for Aerospace Industry

2002 ◽  
Author(s):  
Vipul Ranatunga ◽  
Jay S. Gunasekera
Keyword(s):  
High Temperature ◽  
Process Modeling ◽  
Raw Materials ◽  
Software Tool ◽  
Rolling Process ◽  
Ring Rolling ◽  
Shape Rolling ◽  
Turbine Engine ◽  
Design Paradigm ◽  
Super Alloy

Shape rolling of seamless rings constitutes an efficient manufacturing process offering excellent material yield, energy conservation, and component production, which require a minimum of subsequent machining operations. An increasing number of rings are being produced from high temperature Titanium and Nickel based super alloy materials for gas turbine engine parts such as vane and fan casings, exhaust casings, turbine shrouds, and combustion liners. With the increasing cost of super alloy raw materials and growing demand for cost-competitive parts, the importance of ring rolling to contoured shape becomes an increasingly important factor. This paper describes a new process modeling technique based on Upper Bound Elemental Technique (UBET) for shape rolling of super alloys. This tool provides a new design paradigm for an industry relying to heavily on designer experience and cut-and-try methods. As a rapid software tool to aid designers in developing ring-rolling process schedules thereby helping in reducing the design and analysis cycle time, the potential to capture the unique 3-D flow situation experienced in shape rolling of seamless rings is being explored. Numerical results have been compared with data available for high temperature alloys such as IN718 and Ti-6Al-4V.

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