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A study on effects of ceramic foam filter on flow aspect through water modeling experiment

China Foundry 2017年第3期14卷 216-225页

作者： Ho-Young Hwang Cheol-Hee Nam Young-Sim Choi Jun-Ho Hong Xun Sun Cyber Manufacturing Process Group Korea Institute of Industrial Technology Incheon 21999 South Korea Department of Robotics and Virtual Engineering Korea University of Science and Technology Daejeon 34113 South Korea Materials Science and Engineering Kyoto University Kyoto 606-8501 Japan Shenyang Research Institute of Foundry Shenyang 110022 China

Casting defects that are closely related to entrapped air bubbles and metallic oxides occur very frequently in the sand mold casting process. Many researchers have shown that these defects can be reduced by adopting an appropriate gating system design. However, it is difficult for field engineers to identify a specific gating system that is more appropriate for their products. In this study, we tried to draw a comparison between two gating system designs with and without a ceramic foam filter. The ceramic foam filter was added to the horizontal runner just after the down sprue to prevent air bubble generation and reduce turbulence without a change of gating system design. The water modeling experiment was conducted with four different amounts of the initial volumes of water in the reservoir to verify the effects of initial pouring velocity. The results of the experiment applying the filter showed remarkably changed flow characteristics. The use of the filter was found to convert the flow pattern of water in the desired direction. The ceramic foam filter performed well to reduce flow velocity and stabilize the water *** flow pattern without a filter can be improved significantly even with the the use of just a 10 PPI irregular filter. Although the study confirmed that use of the filter may change the flow characteristics, it needs to be noted that the use of the ceramic filter alone cannot solve all the problems caused by a poorly designed gating system.

关键词： ceramic foam filter sprue gating system design sand mold casting casting defect

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Electromagnetically Modified Filtration of Liquid Aluminium With a ceramic foam filter

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Journal of Iron and Steel Research International 2012年第S1期19卷 72-76页

作者： R.Fritzsch M W Kennedy S Akhtar J A Bakken R E Aune Department of Materials Science and Engineering Norwegian University of Science and Technology Hydro Aluminium Karm y Havik 4265Norway Department of Materials Science and Engineering Royal Institute of TechnologyStockholm 10044Sweden

Conventional ceramic foam filter(CFF)technology has some difficulties in removing fine particulates(e.g.<20 μm)from liquid *** the present work the filtration behaviour of 30,50 and 80 ppi CFF filters have been studi... 详细信息

Conventional ceramic foam filter(CFF)technology has some difficulties in removing fine particulates(e.g.filters have been studied in the presence of magnetic fields in the range of 0.06-0.2T,produced by induction coils operated at 50 Hz. A feed recipe containing 90 wt.%of the aluminium alloy A356 doped with 10 wt.%A356 composite,containing 15 wt% SiC particles with a particle size ranging from 13 to 23 μm,was *** the results obtained for the experiments conducted under the influence of a magnetic field where compared with similar reference gravity filtration experiments profound changes were observed in the distribution of particulates within,over and below the *** improvements in the wetting behaviour of the liquid metal to the CFF surface were also *** is believed that a successful change in filtration mechanisms is obtained as a result of the presence of the Lorentz forces and the metal recirculation produced by the magnetic *** magnitude of the Lorentz forces,*** magnetic pressure,are in the present work discussed in relation to the filtration results,and quantified based on experimental data and validated 2D axial symmetric Finite Element Modelling(FEM).

关键词： electromagnetic filtration ceramic foam filter

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Current Status and Application of ceramic foam filter for Aluminum Melt

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China's Refractories 2010年第2期19卷 30-37页

作者： JI Shujun GUO Xueyi DONG Jianxiong SU Peng School of Metallurgical Science and Engineering Central South University Changsha 410083 China Baotou Aluminum Co. Ltd. Baotou 014046 China

The importance of purification for aluminum and aluminum alloy casting was outlined. By comparing ceramic foam filters （CFF） in China and overseas, the existing problems and challenges of China＇ s CFF for aluminum were given. Measures to improve the performance of CFF were put forward based on material, preparation process, utility evaluation, etc.

关键词： Aluminum melt Inclusion Purification ceramic foam filter

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Non-flux purification behavior of AZ91 magnesium alloy

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Transactions of Nonferrous Metals Society of China 2010年第11期20卷 2037-2045页

作者：吴国华戴吉春孙明丁文江 National Engineering Research Center of Light Alloy Net Forming Shanghai Jiao Tong University State Key Laboratory of Metal Matrix Composites Shanghai Jiao Tong University

The effects of non-flux purification techniques on the mechanical properties and microstructure of AZ91 magnesium alloy were investigated by ICP,OM,XRD and *** results show that Ar spraying with high flow rate could remove non-metallic inclusions and improve the mechanical properties of *** alloy obtains the best properties after argon spraying for 30 min at the melt temperature of 740 °*** ceramic foam filter(CFF) could effectively improve the ultimate tensile strength and elongation of AZ91 alloy,especially the elongation,which increase with increasing pores per inch(ppi) and the thickness of ***-flux purification does not change the microstructure of AZ91 ***,filtration has a certain effect on the fracture pattern of AZ91 *** improve the mechanical properties effectively,both filtration and gas spraying should be utilized together.

关键词： AZ91 magnesium alloy inclusions non-flux purification argon spraying ceramic foam filter filtration

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