4 results on '"open cell aluminum foam"'
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2. Analysis and characterization of 20 ppi open cell aluminum foam under mechanical loading
- Author
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S. Hussain, A. Shakoor, and T. Yasmin
- Subjects
open cell aluminum foam ,characterization ,mechanical loading ,scanning electron microscopy ,alporas rout ,number of pores per inch (ppi) ,Mechanical engineering and machinery ,TJ1-1570 ,Mechanics of engineering. Applied mechanics ,TA349-359 - Abstract
In this research the analysis and characterization of open cell aluminium foam with 20 pores per inch (ppi) of Alporas rout under mechanical loading is presented in order to provide a basic understanding with respect to pore size per unit length for the right selection in various engineering applications. For this purpose, three point bending test, tensile test, compression test, vickers hardness test and charpy impact test were performed to seek out the respective properties of each test. All samples and test procedure were performed as per ASTM standards. The scanning electron microscopy (SEM) will performed of the fractured surfaces of the specimens to investigate the failure mode. The SEM photograph shows that; some internal defects were found such as the tinny cracks some irregular shape holes in the cell wall which have been created during foaming process. The shredded cell wall is looked over which was ductile in nature and have occurred during flexural, tensile and charpy impact test. In compression; all pores are collapsed in plateau region, and some crumples and brittle tiny cracks are detected in densifications stage. Dislocation band also detected on the walls and struts of the effected sample of tensile and charpy impact test.
- Published
- 2022
- Full Text
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3. Thermal Conductivity of Open Cell Aluminum Foam and Its Application as Advanced Thermal Storage Unit at Low Temperature.
- Author
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Chunhui, Kong, Liubiao, Chen, Xianlin, Wu, Yuan, Zhou, and Junjie, Wang
- Abstract
The development and characterization of new materials is of extreme importance in the design of cryogenic apparatus. Recently a kind of open cell aluminum foam was used for heat transfer enhancement at cryogenic temperature. Such aluminum foam was tested for cryogenic energy storage with a phase change material of nitrogen. The thermal conductivity of the open cell aluminum foam was studied. The thermal conductivities of the aluminum foam were measured between 50 and 170 K. The results show that the thermal conductivity increases with the temperature decreasing. Then the effects of thermal conductivity of open-cell aluminum foams on the performance of aluminum foam phase change material thermal storage unit were investigated. Nitrogen was selected as the phase change material. Temperature variations of the thermal storage unit during cooling and melting processes were tested. Test result shows that the maximum temperature difference between the up and bottom of the thermal storage unit is less than 0.5 K, much lower than the case without aluminum foam. It is concluded that as the thermal conductivity of thermal storage unit increases, both the container temperature difference and temperature variation of the thermal storage unit decrease. [ABSTRACT FROM AUTHOR]
- Published
- 2018
- Full Text
- View/download PDF
4. Açık hücreli alüminyum köpük üretimi ve karakterizasyonu
- Author
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Zaman, Elvan, Keleş, Özgül, İleri Teknolojiler Ana Bilim Dalı, Malzeme Bilimi ve Mühendisliği, and Material Science and Engineering
- Subjects
açık hücreli alüminyum köpük ,slurry method ,Polyurethane ,Metalurji Mühendisliği ,çamur köpüklendirme yöntemi ,Metallurgical Engineering ,Engineering Sciences ,Foam ,Polyvinyl alcohol ,open cell aluminum foam ,Mühendislik Bilimleri ,Aluminum - Abstract
Tez (Yüksek Lisans) -- İstanbul Teknik Üniversitesi, Fen Bilimleri Enstitüsü, 2011, Thesis (M.Sc.) -- İstanbul Technical University, Institute of Science and Technology, 2011, Bu çalışmada; çamur köpüklendirme (polimer emdirme) yöntemi kullanılarak açık hücreli alüminyum ile %2 ve %4 bakır takviyeli alüminyum köpük üretilmiş ve üretilen köpüklerin karakterizasyonları yapılmıştır. İlk olarak; belirli bir sıcaklığa kadar ısıtılan saf su içerisinde polivinil alkol çözündürüldükten sonra metal tozları da eklenerek bir çamur karışımı hazırlanmıştır. Belirli ebatlarda kesilen açık hücreli poliüretan sünger bu karışıma daldırılarak çamur karışımı ile kaplanmıştır. Çamur karışımı ile kaplanan köpükler önce oda sıcaklığında, ardından da etüvde kurutulmuş ve son olarak da poliüretan sünger giderilerek, yapı sinterlenmiştir. Çalışmada, %51-%60 katı oranına sahip çamur karışımları hazırlanmış, yapılan viskozite ve sedimentasyon testleri sonucunda en ideal çamur reçetesinin % 60 katı oranına sahip olan çamur karışımına ait olduğu tespit edilmiştir. Bu ideal çamur karışımı kullanılarak üretilen açık hücreli köpüklerin arşimet prensibine göre yoğunlukları 0,12-0,19 gr/cm3 arasında ve porozite değerleri % 93,2-%95,5 arasında hesaplanmıştır. Makro ve mikro yapıları incelenen açık hücreli köpüklerin XRD analizleri yapılarak; bakır takviyeli alüminyum köpüklere normal atmosfer şartlarında yapılan sinterlemeler sonucunda bakır takviyeli alüminyum köpüklerin yapılarında; CuO ve Cu2O oluştuğu, argon atmosferinde yapılan sinterlemelerde ise bu bakır oksit yapılarının azaldığı görülmüştür. Son olarak açık hücreli alüminyum köpüklerin Vickers sertlikleri 30,6-34,7 HV aralığında ölçülmüştür., In this study we produced open cell aluminum, %2 and %4 copper additional aluminum foam with slurry method (polymer impregnation) and were characterised. In this method; we solubilized polyvinyl alcohol in distile water which is heated at specified temperature then we added metal powder in this mixture and made a slurry. Polyurethane foam which is cut at specified dimensions was impregnated in the slurry and polyurethane foam was coated. The coated foams were dried at room temperature then in drying oven. Lastly polyurethane burned out and metal foam was sintered. In this study, %51-%60 solid ratio slurries have been prepared. As a result of viscosity and sedimentation test, % 60 solid ratio slurry have been determined as optimal slurry receipt. Open cell foams densities by principal of Archimed have been calculated in the range of 0,12-0,19 gr/cm3 and the porosity values have been calculated within % 93,2- %95,5 which are produced with optimal slurry receipt. Macro and micro structures of open cell foams have been examined. As a result of XRD analyses, in the structure of copper reinforced aluminium cell foams, the occurence of CuO and Cu2O in the normal atmosphere conditions and the decrease of the ratios of CuO and Cu2O in the argon atmosphere were determined during sintering. Vickers hardness of open cell aluminum foams have been calculated within 30,6-34,7 HV., Yüksek Lisans, M.Sc.
- Published
- 2011
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