The melt treatment in steps of the casting includes
Answers
A foundry is a factory that produces metal castings. Metals are cast into shapes by melting them into a liquid, pouring the metal in a mold, and removing the mold material or casting after the metal has solidified as it cools. The most common metals processed are aluminium and cast iron. However, other metals, such as bronze, brass, steel, magnesium, and zinc, are also used to produce castings in foundries. In this process, parts of desired shapes and sizes can be formed.
Aluminium and Copper are second and third most produced metal world wide after
iron (steel). But in melt treatment technologies they are probably the number one.
Although Copper is the metal that is longest used technologically by mankind and
Aluminium one of the shortest, in both industries a variety of melt treatments and
sometimes similar technologies were investigated over time. But as for most industries a
look into the technology of a non competing neighbour often is missing, because contact
is lost due to a lack of connection points. This plenary paper tries to bridge this gap, here
the most important melt treatment techniques are presented and compared between these
two metals. It is accentuated what the industries can learn from each otherThe major difference of Aluminium and Copper is the affinity to oxygen. While
Aluminium is a very un-noble element and its melt forms insoluble oxides rapidly,
Copper is considered a half noble metal but with a high solubility for oxygen in the
liquid state. The major similarity is the outstanding heat and electrical conductivity of
both metals. Although Copper has a ~50 % better conductivity than Aluminium the conductivity to density ratio is in favour of Aluminium. This is especially of interest in
mobile applications as for example heat exchangers in automobiles. In comparison
Copper heat exchangers are preferably used in stationary and elevated temperature
applications. For both metals partly similar melt treatment techniques were developed.
Impurities like dissolved gases and solid inclusions are battled with the same principles,
whereas dissolved metallic impurities have to treated differently. In this paper an
overview on the melt treatment techniques of Aluminium and Copper melts are given
and gas purging, slag treatment and filtration as examples are explained in more detail.
APPLICATIONS OF ALUMINIUM AND COPPER
For increasing applications the Aluminium quality has to meet high performance
specifications for foils, sheets for can bodies and offset plates as well as parts for the
production of CDs. The requirements on the material in respect to cleanliness are very
high as the thickness of a can body sheet is nowadays only < 300 µm. Therefore the
number of defects caused by inclusions and gas pores have to be decreased drastically.
More than 60 % of the Aluminium production is used for packaging from which a large
part is Aluminium foil. Aluminium foils are used for the protection of food, e.g. in
combination with plastic or paper for the production of juice containers. Inclusions of a
size > 10 µm lead to holes in the foil and cause spoiled products. Lithographic sheets for
offset plates have to have a perfect surface.
Copper is mainly used for electrical conductivity applications. Besides the day-to-day
household uses there are some fields where extreme product cleanliness is necessary.
I hope this much is okay for u.....
The options for this question are missing. Here are the missing options:
A. Fluxing
B. Degassing
C. Alloying for grain refinement and modification
D. All of above
The answer to this question is D. All of the above
This procedure usually happens in industrial facilities where various types of metals are standing into various shapes, sizes and alloys.
The melt treatment alludes to the melting metals at high temperature and cooling them rapidly keeping in mind the end goal to give them a specific shape.
Flux: Flux is the nearness of a force field in a predefined physical medium, or the stream of vitality through a surface.
Degassing: Vacuum degassing forms, in the broadest sense, allude to the presentation of molten steel to a low-pressure condition to expel gases (mostly hydrogen and oxygen) from the steel.
Alloying: A metallic solid or fluid that is made out of a homogeneous blend of at least two metals or of metals and nonmetal or metalloid components.