Design and Manufacturing of Hybrid Material Systems for Directed Heat Transfer

2020 ◽  
Author(s):  
◽  
Vaibhav Tummalapalli
Keyword(s):  
Heat Transfer ◽  
Hybrid Material ◽  
Material Systems ◽  
Design And Manufacturing

Research on Key Technology of Ultra-High 3D Strengthening Heat Transfer in Plow Machining

2011 ◽  
Vol 337 ◽  
pp. 46-49
Author(s):  
Li Hua Song ◽  
Jun Yuan Kang
Keyword(s):  
Heat Transfer ◽  
High Speed ◽  
High Performance ◽  
Three Dimensional ◽  
Digital Design ◽  
Forming Process ◽  
Front Angle ◽  
Development Direction ◽  
Design And Manufacturing ◽  
Main Factors

In accordance with the latest development direction in the filed of strengthening the heat transfer technology of strengthening the heat transfer on division of strengthening heat transfer by international authoritative Professor A.E. Bergle）, including 3D(three-dimensional) heat transfer of ultra-high performance improved in the fins of the design and analysis; 3D heat transfer strengthening of the plowing process mechanism the flexibility ,high speed and high precision of gathered tools and the realization of a 3D digital design and manufacturing . It also researches on the influential law of process parameters on the formation of the fin. It is shown that the whole fin-forming process can be classified into three stages：plowing，heaving and fins forming, and that the front angle，plowing depth and the plowing speed are the main factors influencing the fin forming. Moreover，within a certain range，the height of fin increases with the front angle and the plowing depth.

Assessing the feasibility of using a carbon material in the design of a radiative cooler for spacecraft

2020 ◽  
pp. 42-47
Author(s):  
Aleksandr P. BELOGLAZOV ◽  
Andrey G. EREMIN ◽  
Sergey A. NEMYKIN ◽  
Aleksey Yu ZHURAVLEV
Keyword(s):  
Heat Transfer ◽  
Temperature Distribution ◽  
Key Words ◽  
Heat Pipe ◽  
Carbon Material ◽  
Manufacturing Process ◽  
Experimental Studies ◽  
Feasibility Studies ◽  
Braze Joint ◽  
Design And Manufacturing

The paper discusses the results of feasibility studies for using a carbon web as the radiating surface of a spacecraft radiative cooler. It proposes a design and manufacturing process solution that provides for a link between heat-transfer devices and the carbon web that has the necessary strength and minimizes heat loss. It presents results of experimental studies of temperature distribution across the radiative surface of the carbon web with mockups of the heat transfer devices. An analysis of the obtained results showed that the use of a carbon web in the design of a spacecraft radiative cooler is both feasible and promising. Key words: spacecraft, heat-conductive carbon web, radiative cooler, heat pipe, braze joint, heater.

scholarly journals Ultrasonic Welding of Magnetic Hybrid Material Systems – 316L Stainless Steel to Ni/Cu/Ni-Coated Nd2Fe14B Magnets

2020 ◽  
Author(s):  
Moritz Liesegang ◽  
Tilmann Beck
Keyword(s):  
Shear Strength ◽  
Magnetic Flux ◽  
Hybrid Material ◽  
Permanent Magnets ◽  
Ultrasonic Welding ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Adhesively Bonded Joints ◽  
Magnetic Devices ◽  
Material Systems

Abstract The performance of electric sensors is continuously improving due to the demands of modern vehicles and electronic devices. Magnetic sensors are used in a wide field of applications. However, handling and mounting the typical high-performance rare earth permanent magnets are challenging due to their brittleness. A constant magnetic flux is a key property of the magnetic setup in many devices. State-of-the-art adhesive bonding of magnets in devices can cause problems due to the low durability and viscous behaviour of adhesive polymers, as the magnet may change its position and hence, the magnetic flux distribution in the magnetic setup changes.Ultrasonic welding is a powerful technique to join hybrid material systems quickly and reliably, providing high joint strength, even for brittle materials such as glasses, ceramics and rare earth permanent magnets. The latter is being investigated in this work for the first time. The ultrasonic welding process was adapted to join 316L stainless steel, representing potential components of magnetic devices, to Ni/Cu/Ni-coated Nd2Fe14B. In addition to directly joined steel/magnet-hybrids, ductile aluminium and nickel interlayers were used in order to enhance the joint strength. Process parameters were developed and evaluated considering the resulting shear strength of the joints. The highest shear strength of 35 MPa was achieved for 316L/Nd2Fe14B and 316L/Al/Nd2Fe14B, which is more than twice the shear strength of adhesively bonded joints of up to 20 MPa, according to the literature. The functional performance of the hybrid material systems, evaluated by the magnetic flux density of the hybrid material systems was the highest for directly bonded joints, and those with a nickel interlayer, which did not show any losses in comparison to the single magnet in its initial state. Joints with an aluminium interlayer showed losses of 3% and adhesively bonded joints showed losses of 7% of the magnetic flux density.In summary, the results of this work indicate that ultrasonic welding is a suitable technique to improve the production process and performance of magnetic devices.

Modeling of wave configuration during electrically ignited combustion synthesis

2001 ◽  
Vol 16 (1) ◽  
pp. 93-100 ◽  
Author(s):  
O. A. Graeve ◽  
E. M. Carrillo-Heian ◽  
A. Feng ◽  
Z. A. Munir
Keyword(s):  
Heat Transfer ◽  
Thermal Conductivity ◽  
High Temperature ◽  
Combustion Synthesis ◽  
Small Samples ◽  
Combustion Mode ◽  
Temperature Synthesis ◽  
Ignition Point ◽  
High Temperature Synthesis ◽  
Material Systems

A model was developed to study the process of current-ignited combustion synthesis. In this process, Joule heating raises the temperature to the ignition point, at which the sample reacts to form a product. Two material systems were modeled: the synthesis of SiC and MoSi2. It was found that the mode of combustion is a function of the size (radius) of the sample. The anticipated volume combustion mode was only evident in small samples. At higher values of the radius, the mode becomes wavelike (selfpropagating high-temperature synthesis) in nature. The transition from volume to wave combustion mode also depended on the properties of the material. The results are interpreted in terms of thermal conductivity and heat-transfer conditions.

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