scholarly journals Fabrication of Two-Layered Aluminum Foam with Closed-Cell and Open-Cell Structures and Shaping of Closed-Cell Layer by Press Forming Immediately after Foaming

Metals ◽  
2021 ◽  
Vol 11 (1) ◽  
pp. 140
Author(s):  
Yoshihiko Hangai ◽  
Mizuki Ando ◽  
Masataka Ohashi ◽  
Kenji Amagai
Keyword(s):  
Aluminum Alloy ◽  
Melting Point ◽  
Aluminum Foam ◽  
Cell Layer ◽  
Open Cell ◽  
Press Forming ◽  
Cell Structures ◽  
Closed Cell ◽  
The Press

Two-layered aluminum foam consisting of both closed and open cells is expected to improve the functionality of aluminum foam, because the cells have different morphologies and characteristics. In this study, press forming of the closed-cell layer of the two-layered aluminum foam immediately after foaming was performed to shape the closed-cell layer. By measuring the temperatures of the two layers during foaming, we found that it is necessary to use aluminum alloy with a higher melting point for the open-cell layer than that for the closed-cell layer to foam the closed-cell layer. In the press forming experiments, the closed-cell layer could be shaped by press forming while the shape of the open-cell layer was maintained.

Open-Cell Foam Metal Production and Characterization by Aluminum Solid Mold Investment Casting

2019 ◽  
Author(s):  
Kerem Altug Guler
Keyword(s):  
Investment Casting ◽  
Replication Process ◽  
Open Cell ◽  
Metal Fabrication ◽  
Cell Structures ◽  
Closed Cell ◽  
Small Complex ◽  
Open Cell Foam ◽  
Foam Metal ◽  
Cell Foam

Foam metals can be categorized in two basic classes: open-cell and closed-cell structures, which both have different numerous unique properties. Up to the present, several production processes have been developed for each class. Investment casting is known as a replication process for open-cell foam metal fabrication. Solid mold, which can be evaluated as a subtechnique of the investment casting, is specialized especially for small complex shapes with ultrathin sections. This work is a presentation of aluminum open-cell foam production with solid mold investment casting using two different kinds of patterns. The first one is “burnable,” in which liquid metal directly fills the shape of pattern and the second is “leachable,” in which metal takes the form of intergranular network shape of porous salt preforms.

scholarly journals Characterization and Preparation of Furanic-Glyoxal Foams

Polymers ◽  
2020 ◽  
Vol 12 (3) ◽  
pp. 692 ◽  
Author(s):  
Xuedong Xi ◽  
Antonio Pizzi ◽  
Hong Lei ◽  
Guanben Du ◽  
Xiaojian Zhou ◽  
...  
Keyword(s):  
Ignition Temperature ◽  
Furfuryl Alcohol ◽  
Room Temperature ◽  
Laser Desorption ◽  
Open Cell ◽  
Molar Ratios ◽  
Cell Structures ◽  
Closed Cell ◽  
Combustion Properties ◽  
Compression Resistance

Synthetic foams have become an essential industrial product for a great variety of applications. Furfuryl alcohol, as a biomass chemical, was reacted with glyoxal at room temperature to prepare furanic-glyoxal rigid foams, and p-toluenesulfonic acid was used as a catalyst to initiate the reaction. Foams with different molar ratios (furfuryl alcohol/glyoxal) were prepared in this work, and uniform cells foams have been obtained. Their compression resistance, 24-h water absorption, density, and other basic properties were tested. Scanning electron microscopy (SEM) was used to observe the cellular morphology of the foams prepared, thermogravimetric analysis (TGA) helped to understand their thermal and combustion properties, and FTIR and Matrix Assisted Laser Desorption Ionisation Time of Flight (MALDI ToF) mass spectroscopy to explain the structure of the resulting foams to clarify the reactions occurring during foaming. The results show that the compression resistance of furanic-glyoxal foams declined as the furfuryl alcohol/glyoxal ratio decreases also. SEM observations revealed that foams with open-cell were obtained when furfuryl alcohol was added in greater amounts, and more closed cell structures were formed as the proportion of glyoxal increased. TGA results showed that the initial ignition temperature of furanic-glyoxal foams is ~200 °C higher than that of wood, and the smaller comprehensive combustion index S (about 0.15 × 10−7 (%2 K−3 min−2)) indicates that the foam burns slowly and has poor flammability, that is, it is not easy to burn.

Compressive properties of two-layered aluminum foams with closed-cell and open-cell structures

2020 ◽  
Vol 24 ◽  
pp. 101249
Author(s):  
Yoshihiko Hangai ◽  
Mizuki Ando ◽  
Masataka Ohashi ◽  
Kenji Amagai ◽  
Ryosuke Suzuki ◽  
...  
Keyword(s):  
Compressive Properties ◽  
Aluminum Foams ◽  
Open Cell ◽  
Cell Structures ◽  
Closed Cell

Numerical Prediction of the Effective Thermal Conductivity of Open- and Closed-Cell Foam Structures

2010 ◽  
Vol 297-301 ◽  
pp. 1210-1217 ◽  
Author(s):  
Seyed Mohammad Hossein Hosseini ◽  
Andreas Öchsner ◽  
Thomas Fiedler
Keyword(s):  
Thermal Conductivity ◽  
Thermal Properties ◽  
Relative Density ◽  
Effective Thermal Conductivity ◽  
Linear Trend ◽  
Space Filling ◽  
Open Cell ◽  
Cell Structures ◽  
Closed Cell ◽  
Cell Foam

This paper investigates the thermal properties of metallic open-cell and closed-cell foam structures in space filling and non-space filling configurations. In both, i.e. open-cell and closed-cell structures, a linear trend depending on the relative density has been reported. However the closed-cell structures compared to open-cell ones have a higher thermal conductivity for the same relative density.

Fabrication of Two-Layered Aluminum Foam Having Layers with Closed-Cell and Open-Cell Pores

2018 ◽  
Vol 49 (10) ◽  
pp. 4452-4455 ◽  
Author(s):  
Yoshihiko Hangai ◽  
Hiroki Ikeda ◽  
Kenji Amagai ◽  
Ryosuke Suzuki ◽  
Masaaki Matsubara ◽  
...  
Keyword(s):  
Aluminum Foam ◽  
Open Cell ◽  
Closed Cell

Effect of side die pressure and adaptive die temperature control in press forming of U-beam using carbon fiber-reinforced PA6 sheets

2017 ◽  
Vol 51 (30) ◽  
pp. 4273-4286 ◽  
Author(s):  
Daichi Tatsuno ◽  
Takeshi Yoneyama ◽  
Kiichirou Kawamoto ◽  
Masayuki Okamoto
Keyword(s):  
Control System ◽  
Melting Point ◽  
Temperature Control ◽  
Processing Time ◽  
Side Wall ◽  
Temperature Control System ◽  
Press Forming ◽  
Side Pressure ◽  
The Press ◽  
Die Temperature

In this study, the die cushion of a mechanical servo press was innovatively used to apply a side pressure to the die during the press forming of a U-beam from stampable sheets, and the die temperature was controlled by a heat-and-cool oil system. The side die pressure, which was independent of the press pressure, was applied through the vertical sides of the U-beam by using the servo die cushion to slide the side wall of the die. The die temperature control system was used to heat the die slightly below the melting point of the resin in the stampable sheets, maintain the temperature of the sheets at the beginning of the press forming, and rapidly cool the sheets immediately after the forming. As targeted, the temperature control enabled sufficient deformation of the sheets, adequate removal of voids, and shortening of the processing time. The servo die cushion of the press machine was also confirmed to be effective for applying the side die pressure during the forming.

Closed-Cell Metal Foams Manufactured from Bulk Metal and Alloy Sheets through ARB Process

2005 ◽  
Vol 475-479 ◽  
pp. 433-436 ◽  
Author(s):  
Koichi Kitazono ◽  
Eiichi Sato
Keyword(s):  
Aluminum Alloy ◽  
Manufacturing Process ◽  
Aluminum Foam ◽  
Processing Condition ◽  
High Porosity ◽  
Aluminum Foams ◽  
Roll Bonding ◽  
Blowing Agent ◽  
Closed Cell ◽  
Aluminum Alloy Powder

Aluminum foams having extremely low densities offer a large potential for lightweight structural materials. New manufacturing process without expensive aluminum alloy powder has been developed using conventional bulk aluminum alloy sheets. Preform plate containing blowing agent particles is first manufactured through accumulative roll-bonding (ARB) process. By heating the preform plate, closed-cell aluminum foams having various porosity and cell morphology are produced. It was revealed that ARB processing condition is significantly important to produce suitable aluminum foam with high porosity and uniform pore distribution. Present manufacturing process also possesses a potential to apply to many other metal and alloy foams.

Effect of cell size on the energy absorption of closed-cell aluminum foam

2018 ◽  
Vol 60 (6) ◽  
pp. 583-590 ◽  
Author(s):  
Jinglin Xu ◽  
Jianqing Liu ◽  
Wenbin Gu ◽  
Zhenxiong Wang ◽  
Xin Liu ◽  
...  
Keyword(s):  
Cell Size ◽  
Energy Absorption ◽  
Aluminum Foam ◽  
Closed Cell

Technical solutions of vibration safety cold riveting performed ship repair

2020 ◽  
pp. 172-179
Author(s):  
A.Ya. Rozinov
Keyword(s):  
Aluminum Alloy ◽  
Cold Shock ◽  
Vibration Disease ◽  
Shock Absorbers ◽  
Heating And Cooling ◽  
The Press ◽  
Press Equipment ◽  
Technical Solutions ◽  
Ship Repair ◽  
Reverse Methods

The parameters of heating and cooling of rivets made of steel and aluminum alloy, as well as data of fi lling holes with these rivets during hot and cold riveting are compared. The features of the process of performing cold impact riveting by direct and reverse methods, as well as the possibility of reducing the force of this riveting by improving the closing heads and constructive transformation of the rivets themselves are considered. Features of physiological infl uence of cold shock riveting on hands, elbows and shoulders of workers are determined. Describes the construction of riveting hammers and supports with spring shock absorbers that prevent the disease of workers vibration disease, portable riveting presses of pneumatic and hydraulic action. A description of the press equipment and technology of bolt-riveting connections, allowing mechanizing the process of cold riveting is given.

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