FOAMING AGENT FOR ALLOYS OF ALUMINIUM FOAMS

2018 ◽  
Vol 32 (2) ◽  
pp. 53-59
Author(s):  
Jozsef Juhasz ◽  
Vasile Hotea ◽  
Keyword(s):  
Thermal Analysis ◽  
Pore Structure ◽  
Powder Compact ◽  
Matrix Alloy ◽  
Aluminium Foam ◽  
Foaming Agent ◽  
Melting Technique ◽  
Foam Production

The powder compact melting technique for aluminium foam production as practised today accepts a certain mismatch between foaming agent decomposition and matrix alloy melting temperatures.This mismatch is believed to influence the pore structure in an unfavourable way. Adjustment of TiH 2 decomposition as well as liquidus and solidus temperatures of matrix alloys can be used to counteract it. Effects of TiH 2 thermal are investigated using thermal analysis. TiH 2 variants gained via annealing treatments were used to produce aluminium foam precursor materials.

Influence of Material and Arrangement Mold on the Foaming Behavior of Extruded Precursor

2018 ◽  
Vol 933 ◽  
pp. 92-96
Author(s):  
Fang Wang ◽  
Lu Cai Wang
Keyword(s):  
Pore Structure ◽  
Powder Compact ◽  
Orthogonal Test ◽  
Furnace Temperature ◽  
Foam Expansion ◽  
Foaming Agent ◽  
Foaming Behavior ◽  
Hollow Part ◽  
Foaming Time

In this paper, the extruded precursors were prepared by Powder compact method (PCM),with two different powder AlSi10 or pure Al mixed foaming agent ZrH2 or TiH2, then they were foamed to fill the hollow part. L9 (33) orthogonal test was planned, including three factors, furnace temperature; foaming time; and arrangement mode. The results indicated that the pore structure were effectively improved through adjusting the arrangement mode of precursors. The specimens have been obtained the homogeneous foam expansion when the AlSi10-TiH2 agent were arranged on the top while AlSi10-ZrH2 agent precursors at the bottom in the hollow, and foamed 14 min~16 min at 800 °C

scholarly journals Aluminium foam production control by using a combined fuzzy-genetic algorithm model

Procedia CIRP ◽  
2020 ◽  
Vol 88 ◽  
pp. 503-508
Author(s):  
Gennaro Salvatore Ponticelli ◽  
Stefano Guarino ◽  
Oliviero Giannini ◽  
Flaviana Tagliaferri ◽  
Simone Venettacci ◽  
...  
Keyword(s):  
Genetic Algorithm ◽  
Production Control ◽  
Aluminium Foam ◽  
Fuzzy Genetic Algorithm ◽  
Fuzzy Genetic ◽  
Foam Production ◽  
Genetic Algorithm Model

Metal Foam Production Process Using Hydro-Gel and its Improvement

2007 ◽  
Vol 539-543 ◽  
pp. 1845-1850 ◽  
Author(s):  
Toru Shimizu ◽  
Kunio Matsuzaki
Keyword(s):  
Stainless Steel ◽  
Production Process ◽  
Cell Size ◽  
Metal Foam ◽  
Heating Temperature ◽  
Foaming Agent ◽  
Steel Foam ◽  
Foam Production

Already, we are developing the process to produce stainless steel foam over 97% porosity using hydro-gel binder. However, this process is very sensitive process, and foaming condition is affected by the slight deference of heating temperature. Therefore, we tried to improve the process by changing the foaming agent and foaming conditions. By the improvement of the process, the foaming operation becomes stable and finer cell size stainless steel foam can be obtained.

scholarly journals Effect of Phenolic Particles on Mechanical and Thermal Conductivity of Foamed Sulphoaluminate Cement-Based Materials

Materials ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 3596 ◽  
Author(s):  
Xiuzhi Zhang ◽  
Qing Yang ◽  
Qinfei Li ◽  
Heng Chen ◽  
Guofa Zheng ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Pore Structure ◽  
Dry Density ◽  
Mechanical And Thermal Properties ◽  
Foaming Agent ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Performance Indexes ◽  
Foamed Concrete ◽  
Inorganic Matrix

Foamed concrete materials based on sulpoaluminate cement were prepared by the chemical foaming method. The effects of water–cement ratio, foaming agent, and foaming stabilizer on the mechanical and thermal properties of foamed concrete were studied. Meanwhile, a portion of cement was replaced with foamed phenolic particles to further optimize the performance of foamed concrete; the results show that when the water–cement ratio was 0.53, the foaming agent content was 5%, the foam stabilizer was 1%, and the substitution of phenolic particles was 20%, the performance indexes of foamed concrete were the best. Methods, describing briefly the main methods or treatments applied: dry density was 278.4 kg/m3, water absorption was 19.9%, compressive strength was 3.01 MPa, and thermal conductivity was 0.072 W/(m·K). By the pore structure analysis of the foamed concrete suing Micro-CT, it was found that when the replacement amount of phenolic particles was 20%, the pore size of foamed concrete was relatively uniform, the minimum D90 was 225 μm respectively. The combination of organic and inorganic matrix and optimized pore structure improved the performance of foamed concrete.

scholarly journals Effect of CaCO3 Foaming Agent at Formation and Stabilization of Al-Based Foams Fabricated by Powder Compact Technique

2017 ◽  
Vol 58 (2) ◽  
pp. 249-258 ◽  
Author(s):  
Aleksandra V. Byakova ◽  
Svyatoslav V. Gnyloskurenko ◽  
Takashi Nakamura
Keyword(s):  
Powder Compact ◽  
Foaming Agent

Novel authigenic gas foaming hydrogels for preventing coal spontaneous combustion

e-Polymers ◽  
2015 ◽  
Vol 15 (5) ◽  
pp. 361-368 ◽  
Author(s):  
Xiangming Hu ◽  
Weimin Cheng ◽  
Zhenlu Shao
Keyword(s):  
Thermal Stability ◽  
Thermal Analysis ◽  
Acetic Acid ◽  
Electron Microscope ◽  
Scanning Electron Microscope ◽  
Substantial Effect ◽  
Foaming Agent ◽  
Synchronous Thermal Analysis ◽  
Gas Foaming ◽  
Scanning Electron

AbstractAuthigenic gas foaming hydrogels were synthesized using chitosan (CS), acrylic acid, and attapulgite (APT) as hydrophilic monomers; potassium persulfate as initiator; N,N′-methylenebisacrylamide as cross-linker; and sodium carbonate (Na2CO3)/acetic acid as foaming agent. Effects of different monomers, amount of foaming agent, and temperature on swelling ratio (SR) of the hydrogels were examined. Morphology, structure, and thermal stability of authigenic gas foaming hydrogels were studied using field emission scanning electron microscope, Fourier-transform infrared spectroscopy, and synchronous thermal analysis. Scanning electron microscope images reveal apparent pores on hydrogels, produced by foaming agent Na2CO3/acetic acid. Therefore, more foaming agent would bring more pores on hydrogels. Synchronous thermal analysis results suggest that higher amount of CS would result in higher thermostability of hydrogels. However, APT has no substantial effect on thermal stability. SR decreases with increasing amount of CS. Hydrogels prepared at 70°C reaction temperature exhibit maximum swelling. Furthermore, SR decreases with higher covalence of saltion.

Fabrication of Aluminium Foam Components by Using Powder Compact Melting Method

Volume 3 ◽  
2004 ◽  
Author(s):  
S. Guarino ◽  
V. Tagliaferri
Keyword(s):  
Powder Compact ◽  
Experimental Tests ◽  
Aluminium Foam ◽  
Metal Powders ◽  
Characterization Methods ◽  
Melting Method ◽  
Precursor Material ◽  
Inadequate Knowledge ◽  
Manufacturing Techniques ◽  
Energy Absorbing

Recently, closed cell cellular metals have been gaining a very high interest due to their unique characteristic applications in various technology domains. They combine the advantages of a metal with the structural advantages of foam. Among these, aluminium foams have created a great interest due to their light weight structure and their various applications in the automotive, aerospace and allied industries. Aluminium foam possesses high stiffness and low density, it has good energy-absorbing properties making it good for crash-protection and packaging and it has attractive heat-transfer properties that permit to use these materials to cool electronic equipment and as heat exchangers in engines. However, its manufacturing techniques and characterization methods need more attention. The inadequate knowledge on the physical phenomena governing the foaming process does not allow to obtain products with repeatable characteristics. In this paper aluminium foams in various fabrication components were produced by applying the powder compact melting method. In particular metal powders (AlSi7) and powdered gas-releasing blowing agents (TiH2) were mixed and subsequently pressed to obtain a foamable precursor material. The resulting precursor was then foamed by heating it up to above its melting point. Experimental tests were performed to study the fabrication of aluminum foam components and with the extent of optimize the pressing parameters of the foamable precursor material, the foaming temperature and the heating rate during foaming. It was studied the effects of geometrical discontinuities in the mould (such as holes, restrictions, etc) on the evolution and on the morphology of metal foams.

Methods for Filling Hollow Structures with Aluminium Foam

2010 ◽  
Vol 638-642 ◽  
pp. 61-66 ◽  
Author(s):  
Joachim Baumeister
Keyword(s):  
Energy Absorption ◽  
Hybrid Structure ◽  
Absorption Capacity ◽  
Aluminium Foam ◽  
Compression Tests ◽  
Foaming Agent ◽  
Hollow Structures ◽  
Industrial Sectors ◽  
Foam Filling ◽  
Application Potential

Aluminium foams produced according to the powder metallurgical/foaming agent process are currently being used in several industrial sectors, such as automotive, rail transport or machine tools. Nevertheless there still is a high further application potential to be exploited. Especially in hybrid structures, e.g. in automotive structures that are locally filled with aluminium foam, great improvements regarding the energy absorption capacity and the sound absorption behaviour can be obtained. In the present paper several methods that allow for filling or local filling of hollow structures are investigated and presented. The effect of the foam filling on the energy absorption behaviour of the hybrid structure is discussed. Similar effects were also observed in compression tests on foam filled hollow profiles. The results of these investigations are presented.

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