Oct
22
2007
Aleaciones ligeras
Effects of process parameters on the morphology of TiAl3 particle during the production of Al-Ti-B master alloy by flux reaction
Min Ryou*, Sang-Ho Choi** and Myung-Ho Kim *
* Inha University, South Korea ** Dongyang Junior Technical College
67th World Foundry Congress
The effect of process parameters, such as reaction temperature and
holding time, on the microstructure of Al-Ti-B master alloy had been
studied by using SEM/EDS and EPMA. The flux reactions between K2TiF6,
KBF4 and molten aluminum were carried out at various temperatures and
holding times. The results indicated that the morphology of TiAl3 particles
in master alloy was strongly influenced by reaction temperature and
holding time. The TiA...
Oct
22
2007
Composites
A novel aluminium matrix composites synthesized by magnetochemical melt reaction in the system Al-Zr-O-B
Y T Zhao *, Y M Youssef **, R W Hamilton ** and P D Lee **1.
* Jiangsu University, Zhenjiang, China, ** Imperial College of London, UK.
67th World Foundry Congress
A novel aluminium matrix composite reinforced with a mixture of in-situ
formed ZrB2, Al2O3 and Al3Zr particulates was synthesized using a
magneto-chemical melt reaction. Using an electro-magnetic assisted melt
reaction resulted in a uniform distribution of in-situ particles with no
indication of clustering and an equivalent diameter in the range of 60 nm
to 2 µm. Using this inexpensive in-situ manufacturing route, a composite...
Oct
11
2007
Moldes y machos
Inorganic binders: properties and experience
K Löchte *, R Boehm *
* Hüttenes-Albertus Chemische Werke GmbH, Germany
67th World Foundry Congress
Foundries are constantly presented with new challenges in terms of
design requirements and in connection with the increasingly stringent
environmental and safety regulations.
Particularly problematic are evaporation, low-temperature carbonization
and cracking products released during casting and subsequent cooling
from the sand cores, which today are mainly produced from resin-bonded
silica sands.
Emissions and the related odours are no...
Oct
11
2007
Medio Ambiente
Novel approaches in reducing pouring emissions
J H Helber
IfG – Institute of Foundry Technology, Germany, Duesseldorf
67th World Foundry Congress
The paper presents a basic understanding of some thermal degradation
processes within the mould. I. e. the mechanism of the formation of
lustrous carbon was investigated as well as the formation of aromatics.
The suppression of those reactions and the state of the art in modelling
the gas phase will be addressed respectively the problems which still have
to be overcome.
The scope of the presented brand new investigational results is rega...
Oct
11
2007
Moldes y machos
Advances in thin-wall sand casting
R.E. Showman, R.C. Aufderheide, N.P. Yeomans
Ashland Casting Solutions, Dublin, Ohio, USA
67th World Foundry Congress
Economic and environmental pressures continue to force metalcasters to
search for ways to produce castings with thinner walls and lighter weight,
but with equal or improved mechanical properties. Previous studies have
shown that the use of low-density alumina-silicate ceramic (LDASC) as a
sand additive/replacement can dramatically modify the thermal properties
of sand molds and cores and can enable the production of thin (<3mm)
sectio...
