KNOWLEDGE development and interchange

Nov 07 2007

Engineering
Rapid shell build for investment casting: revolutionizing an ancient process S Jones, C Yuan and S Blackburn
IRC in Materials Processing, University of Birmingham, UK.
67th World Foundry Congress
Investment casting is a time-consuming, labour intensive process, which can produce complex, high value-added components for a variety of specialised industries. Drying and strength-development of each coat during shell mould production is the most significant rate-limiting factor in the reduction of lead times and production costs for industry. As such, improvements which reduce cost and cycle times, open up new opportunities for produc...

Nov 07 2007

Mould and coremaking
Dispersive mixing of natural molding sand – an optimized preparation process M. Mueller
Maschinenfabrik Gustav Eirich GmbH & Co KG, Hardheim, Germany
67th World Foundry Congress
Natural molding sand with a grain spectrum of 0.5 to 2.0 mm is used for aluminium casting, particularly if the surface of the castings is required to meet high standards. But the processes of molding and aluminium casting cause the formation of hardened agglomerates in the natural sand. This is particularly challenging for the solids mixer, because the agglomerates need to be disintegrated first, before all solid components can be homoge...

Oct 30 2007

Light alloys
A study of the structural controlling of Al-Si alloy by using electromagnetic vibration Jung-Pyung Choi†, *Tae-Woon Nam, and Eui-Pak Yoon
Research Institute of Steel Processing & Application (RISPA) *Hanyang Univ., Ansan, Korea
67th World Foundry Congress
The structural control of Al-Si alloy, which was not studied among various electromagnetic processing of materials, was considered applying the alternating current and direct current magnetic flux density. The main aim of the present study is to investigate the effects of electromagnetic vibration on the macro and microstructure of Al-Si alloy in order to develop a new process of structural control in Al-Si alloy. When the electromagneti...

Oct 30 2007

Light alloys
The effect of using bubbling and AlCuP for refining primary silicon at Al-18%Si alloy Sang-Man Kim, Jung-Pyung Choi†, *Tae-Woon Nam, and Eui-Pak Yoon
Research Institute of Steel Processing & Application (RISPA), *Hanyang Univ., Ansan, Korea
67th World Foundry Congress
This paper investigates the effect of Bubbling and AlCuP on primary Si size in Al-18%Si alloy. Bubbling process and AlCuP treatment are effective for refining primary Si in hypereutectic Al-Si alloy. Both the bubble and AlCuP can be used as nucleation sites of primary Si. Many nucleation sites can make the size of primary Si decreased. So, this experiment suggests that the mix using of bubbling process and AlCuP treatment are more effect...

Oct 30 2007

Engineering
Fabrication of Ni-Al intermetallic compounds on the Al casting alloy by SHS process G.S. Cho*, K.R. Lee*, K.H. Choe*, K.W. Lee* and A. Ikenaga**
*Advanced Material R/D Center, KITECH, Korea, **Osaka Prefecture University, Japan
67th World Foundry Congress
Combustion synthesis with the advantages of time and energy savings has been recognized as an attractive alternative to the conventional methods. In order to improve the surface properties of Al casting components, Ni-Al intermetallic compounds are fabricated by the SHS(Self-propagating High temperature Synthesis) process using the reaction heat of the elemental powders. Three kinds of nickel aluminides, Ni3Al, NiAl and NiAl3 were produc...