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

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.

Production of Ceramics Reinforced Al Foams by Powder Metallurgy Techniques

2011 ◽  
Vol 672 ◽  
pp. 39-46
Author(s):  
Mehmet Turker
Keyword(s):  
Pore Structure ◽  
Volume Fraction ◽  
Linear Expansion ◽  
Experimental Studies ◽  
Three Dimensional ◽  
Al Alloy ◽  
Compaction Process ◽  
Foaming Agent ◽  
Foaming Behavior ◽  
Al Foam

Powders metallurgy route was used to produce foams from pure Al powders and pre-alloyed Al alloy powders (Alumix 231) with or without reinforcing elements addition. Both classical Al foam and spherical Al foam were produced with various production parameters and the results obtained have been discussed. SiC particles were used as reinforcing elements and TiH2 powders were used as foaming agent. Prior to compaction process, Al powders, reinforcing element and foaming agent were mixed in a three dimensional turbula for 30 min. Mixed powders were compacted, sintered and deformed and then foamed at 690 oC for spherical foam and 710 oC for classical foam. Effect of volume fraction of reinforcing elements, foaming temperatures and foaming agent amounts on the foaming behavior, pore structure, pore distribution, linear expansion rate, density and wall thickness of the cell were investigated. Experimental studies have shown that 1% foaming agent and 4 % SiC addition was found to be the most suitable for foaming. In general foam produced from Alumix 231 powders exhibited more homogenous pore structure compared to the ones produced from pure Al powders.

scholarly journals Influence of MWCNT Coated Nickel on the Foaming Behavior of MWCNT Coated Nickel Reinforced AlMg4Si8 Foam by Powder Metallurgy Process

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 955 ◽  
Author(s):  
Ferdinandus Sarjanadi Damanik ◽  
Günther Lange
Keyword(s):  
Powder Metallurgy ◽  
Aluminum Foam ◽  
Imaging System ◽  
Foam Expansion ◽  
Control Interface ◽  
Powder Metallurgy Process ◽  
Foam Composite ◽  
Foaming Behavior ◽  
Metallurgy Process ◽  
Foaming Time

This research studies the effect of multi-wall carbon nanotube (MWCNT) coated nickel to foaming time on the foam expansion and the distribution of pore sizes MWCNT reinforced AlMg4Si8 foam composite by powder metallurgy process. To control interface reactivity and wettability between MWCNT and the metal matrix, nickel coating is carried out on the MWCNT surface. Significantly, different foaming behavior of the MWCNT coated nickel reinforced AlMg4Si8 was studied with a foaming time variation of 8 and 9 min. Digital images generated by the imaging system are used with the MATLAB R2017a algorithm to determine the porosity of the surface and the pore area of aluminum foam efficiently. The results can have important implications for processing MWCNT coated nickel reinforced aluminum alloy composites.

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

scholarly journals Development of an Aluminum-Based Hybrid Billet Material for the Process-Integrated Foaming of Hollow Co-Extrusions

Metals ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1382
Author(s):  
Florian Patrick Schäfke ◽  
Susanne Elisabeth Thürer ◽  
Hans Jürgen Maier ◽  
Christian Klose
Keyword(s):  
Adhesive Bond ◽  
Extrusion Process ◽  
High Energy ◽  
Scanning Calorimetry ◽  
Foaming Agent ◽  
Process Route ◽  
Precursor Material ◽  
Foaming Behavior ◽  
Billet Material ◽  
High Energy Absorption

Metal foams are attractive for lightweight construction in the automotive sector since they provide high-energy absorption and good damping properties, which is crucial, e.g., for crash structures. Currently, however, foams are produced separately and then pasted into the components. Consequently, the overall mechanical properties depend significantly on the quality of the adhesive bond between the foam and the structural component. A new process route for the manufacture of hybrid foamed hollow aluminum profiles is proposed. In this approach, a foamable precursor material is directly integrated into the extrusion process of the hollow structural profile. To this end, special low-melting alloys were developed in this study to enable foaming inside the aluminum profile. The melting intervals of these alloys were examined using differential scanning calorimetry. One of the promising AlZnSi alloys was atomized, mixed with a foaming agent and then compacted into semi-finished products for subsequent co-extrusion. The foaming behavior, which was investigated by means of X-ray microscopy, is shown to depend primarily on the mass fraction of the foaming agent as well as the heat treatment parameters. The results demonstrate that both the melting interval and the foaming behavior of AlZn22Si6 make this particular alloy a suitable candidate for the desired process chain.

scholarly journals Foaming Behavior and Pore Structure Evolution of Foamed Aluminum under the Extrusion Constraint

2020 ◽  
Vol 2020 ◽  
pp. 1-10
Author(s):  
Lucai Wang ◽  
Yanli Wang ◽  
Xiaohong You ◽  
Fang Wang
Keyword(s):  
Pore Structure ◽  
Aluminum Foam ◽  
Melting Behavior ◽  
Heating Time ◽  
Structure Evolution ◽  
Heating Rates ◽  
Cross Sectional ◽  
Factors Affecting ◽  
Maximum Expansion ◽  
Foaming Behavior

This study evaluates foaming behavior and pore structure evolution of aluminum foam by cross-sectional image processing, which was prepared by the powder compact melting (PCM) method under the constraint. The results revealed that the heating time and the heating rate are the key factors affecting the foaming behavior and pore structure of aluminum foam. The thermal decomposition of the foaming agent and aluminum melting behavior affect the foam expansion under different heating times and heating rates. The evolution of the pore structure during the foaming process includes pore formation, small-sized spherical pores, large-sized spherical pores, polygonal pores, merging, and collapse. Due to the limitation of the pipe wall, the maximum expansion height and porosity are constrained, and the macrostructure of aluminum foam is improved.

Study on Fabrication, Defects and Compression Properties of Al Foams at Different Foaming Temperatures

2011 ◽  
Vol 214 ◽  
pp. 70-74 ◽  
Author(s):  
Wei Min Zhao ◽  
Hui Zhang ◽  
Hai Peng Li ◽  
Zhi Feng Wang ◽  
Yang Zhao ◽  
...  
Keyword(s):  
Pore Structure ◽  
Aluminum Foams ◽  
Foaming Agent ◽  
Compression Properties ◽  
Al Powder ◽  
Fabrication Defects ◽  
Lower Temperature ◽  
Foaming Temperature ◽  
Better Than ◽  
Al Foams

Using Al powder as thickening agent and CaCO3 powder as foaming agent, Al foams with above 85% porosity, pore sizes between 1mm and 4mm and relatively uniform pore structure have been fabricated by melt foaming method at different foaming temperatures. Meanwhile, the paper researched the effect of foaming temperature on foaming effect and analyzed the defects in Al foams. At last, compression test were taken in order to investigate the mechanical properties of aluminum foams. The results showed that pore structure, pore distribution and compression properties of Al foams fabricated at 720°C were much better than that fabricated at lower temperature.

Thermal Alkaline Method to Prepare Geotrichuam Candidum Protein Foaming Agent

2013 ◽  
Vol 641-642 ◽  
pp. 845-849
Author(s):  
Jie Jie Zheng ◽  
Ji Chuan Huo ◽  
Hong Lei ◽  
Wei Ai
Keyword(s):  
Mass Concentration ◽  
Geotrichum Candidum ◽  
Raw Material ◽  
Impact Factors ◽  
Optimization Strategy ◽  
Hydrolysis Time ◽  
Foam Expansion ◽  
Foaming Agent ◽  
Subsequent Response ◽  
Hydrolysis Temperature

Geotrichum Candidum strain numbered 2.0498 was used as raw material. The Geotrichum Candidum thallus were collected through inoculation and shaking cultivation. Thermal alkaline method was applied for hydrolyzing Geotrichum Candidum mycoprotein to prepare protein foaming agent. The effect of bacteria concentration, Ca(OH)2mass concentration, hydrolysis temperature and hydrolysis time on foam expansion were studied. The optimization strategy was single factor test and subsequent response surface analysis based on Box-Behnken design. The results showed that the optimized condition were a bacteria concentration of 5.4%(w/v) and a Ca(OH)2mass concentration of 1.5%(w/v), at a hydrolysis temperature of 95°C for 4.1 h. Under these optimal conditions, the foam expansion was 28.1. Compared with the model theory prediction, the relative error was 0.46%. At the same time, a multiple quadratic regression equation between Geotrichum Candidum mycoprotein foam expansion and impact factors was setted up and it played an important role in predicting the foam expansion.

Sign in / Sign up

Export Citation Format

Share Document