Ceramic products for treatment of molten aluminium
TKR developed a special ceramic material for the treatment of
| HI-CERA SN
|| Material: Silicon nitride advanced ceramics.
Features: Excellent heat shock resistance, corrosion
resistance to molten aluminium alloys, high wear resistance.
Applications: Protection tubes, heater tubes, degassing
rotor shaft and other parts in treating molten aluminium.
| HI-CERA SN, TB
|| Material: TiB2 and TiCN based advanced ceramics.
Features: High hardness, wear resistance and electronic
Applications: Any applications required durability, and
level sensors for molten aluminium alloys.
Various parts such as thermocouple protection
tubes, heater protection
tubes, stalks and degassing rotor shafts are being used in the
through melting furnaces to casting tables in the aluminium industry.
nitride fine ceramics is the best material to suit a variety of demands
- outstanding corrosion resistance to molten aluminium alloys
- very good gas tightness,
- excellent oxidation resistance up to 800°C and therefore
- good thermal shock resistance,
- the highest mechanical strength among ceramics,
- very good wear resistance for rotating parts and least but
- an exceptional acid resistance against acids such as HCl and
H2SO4 which allows acid cleaning of the parts.
Thermocouple and Heater Protection Tubes
Hi-Cera SN makes an excellent thermocouple protection tube
the outstanding features. These tubes are maintenance free, have a long
life and are easy to handle.
Hi-Cera SN heater protection tubes have
excellent corrosion resistance,
high mechanical strength and outstanding shock resistance. Using this
ensures a long lifetime. Hi-Cera SN heater tubes are available for both
and horizontal applications.
Stalks for low pressure casting
Hi-Cera SN stalks can replace cast iron stalks and old style
stalks effectively. The excellent corrosion resistance assures longer
life compared to previously used materials. The low wettability to
aluminium makes daily maintenance easier. The adapted flange is
to prevent air leaking and damages by heavy load.
Degassing Rotor Shafts, Wheels and Equipment
Before using the molten aluminium for casting, it is necessary to
hydrogen gas from the melt in order to avoid bubbles in the cast
parts. This can be done by using a rotor, rotating in the aluminium
and purging the molten aluminium through the shaft with Argon gas.
SN rotor shafts and wheels exhibit exceptional wear and oxidation
compared to a graphite rotors. They assure stable high hydrogen removal
efficiency and have a long lifetime. The excellent thermal shock
and the original impeller design permit insertion into and withdrawal
molten aluminium without preheating. The original design of the TKR
wheel results in high gas dispersability and makes hydrogen removal
superior. Hi-Cera SN rotor shafts and wheels are suitable for both
and batch degassing systems.
TKR offers degassing Metaloclean TS equipment
for inline and for batch
processing. In-line degassing units are available with one or two
They are designed for an aluminium flow rate between 150 and 400 kg/min
use an Argon flow of 10 to 60 l/min Argon per rotor. Batch degassing
can take a load of 200 - 1000 kg. Heating of the bath can be done
by immersion heating or by gas burner.
The TKR division of Mitsui Kinzoku introduced a highly efficient
system for molten aluminium called "Metalofilter" in 1972, the result
a extensive research and development program. Metalofilter is now
recognized by the aluminium processing industry as an outstanding
in terms of improved quality and increased molten metal yield. The
for aluminium of higher quality has recently risen for applications in
cars, window frames, disks, foils, cans and many other products.
Metalofilter is the leading aluminium melt filter system in Japan with
market share of close to 100% and has been sold also to many customers
The Metalofilter should be installed after
the degassing unit (when
provided), and just before the casting unit. Inclusions or impure
are captured at the surface or in the filter tubes. Inertia
is utilized to capture inclusions in the filter tubes, enabling
smaller than the pores to be filtered out.
Molten aluminium metal is filtered by fused
and regulated alumina bonded
and fired filter tubes according to the grain size and different raw
Various materials and tube sizes are available. The filter tubes are
in a cartridge with 8, 16 or 28 filter tubes usually. Filtering boxes
the installation of filter cartridges are also available from TKR in
dimensions for a capacity between 100 and 5400 t/box. The installation
the cartridges in the filter box is done using a cartridge hanger,
of two hydraulic cylinders and a cartridge presser. An aluminium
rate of 16 kg/min per filter tube is normal.
The heating lid incorporates a set of heaters
or gas burners to preheat
the box and/or maintain molten metal temperature. S.C.R. power control
utilized. The unit incorporates a digital programmer, distributor and
recorder. Alarms for abnormal molten metal temperature, current
over-current and abnormal thyristor are provided.
| Crystec Technology Trading GmbH will be pleased to further discuss details with you.
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