详情
Foam Ceramic Filter is just developed as a new type molten metal
filters to decrease casting flaw in recent years. Foamed ceramics
have the characters of light weight, high mechanical strength,
large specific surface areas, high porosity, excellent thermal
shock resistance, chemical corrosion resistance and high
temperature stability in molten metal. With the distributing pores
net structure, they are able to increase the surface areas, and
absorb the sinter, the liquid metal becomes more pure, waster
quality problems such as sand pore and air pore are much less. and
the cast quality becomes much better.
Get rid of the impurity, refractory scrap, solid refractory alloy,
sinter, in the
molten metal liquid when casting the products, get rid of turbulent
flow, reduce the air cavity of castings, raise the quality of cast.
So our ceramic foam filters (foamed ceramics) are widely used in
the foundry industry such as casting /foundry of low carbon steel,
stainless steel , iron, bronze, copper, alloy and aluminum for
preventing defects caused by oxides, dross, gas, slag and other
impurities. Alumina Foam Ceramic Filters Zirconia Foam Ceramic
Filters SiC Foam Ceramic Filters, Ceramic Foam Filters.
Advantages:
1. Eliminates turbulence in the metal stream, smoothes out metal
flow, avoiding
sprays, splatter and backset. Improve fluidity, castability,
machinability, yield,
2. Remove a much greater fraction of fine particulate, Reduce
rejects and rework,
Low-pressure loss.
3. Provides consistent flow rate and capacity.
4. Various sizes, shapes and pore sizes are available.
Types of Inclusions and Their Origins
Inclusions show up as alumina, silica, intermetallic sludge
compounds, and other refractory and ceramic hard particles. The
come from many sources: dirty charge materials, tools, ingot,
oxides, foundry sand debris on returns metalworking lubricant
pigments from trim, gates and risers, machined scrap castings
refractory wear debris from furnaces, ladles, and other molten
metal handling vessels oxidation of aluminum, magnesium, and other
reactive alloy elements in the melt itself sludging in die cast.
alloys (precipitation of intermetallic compounds at lower
temperatures) fluxing salts and/or other metallurgical additives
Good furnace practice helps minimize the generation and entrapment
of inclusions, but good practice alone often is not enough. You
usually need effective filtration to ensure quality.
Item 1: Foam-SiC (Silicon Carbide Ceramic Foam Filter)
Silicon carbide is thermally conductive (ceramic foam filters are
insulating oxide ceramics). Therefore, there is less temperature
gradient between the hot and cold sides of the filter. This means
less superheat is required in the hearth, and less sludging occurs
because temperature can be maintained in the dip-out well. Actual
temperature gradients depend on furnace design, well area, metal
throughput, and filter cleanliness.
Gradients less than 5℃ exist with steady metal flow - for example,
during continuous dip-out, ladling, or pouring - and when oxide
buildup, which is insulating, is removed periodically.
Applications: Filters for Molten Iron & Alloy, nodular cast
iron castings, grey iron, castings and malleable castings,and for
the filtration of non-ferrous metals.
Material: SiC (Silicon Carbide)
Working Temperature: ***0℃
Pore Size: *0,*0,*0,*0 PPI
Item 2: Foam-Zr (Zirconia Ceramic Foam Filter)
Applications: Filters for Molten stainless Steel, Alloy steel&
other metal in
precision molding.
Material: Zirconia(ZrO2)
Working Temperature: ***0℃
Pore Size: *0,*0,*0,*0 PPI
Item 3: Foam-AL (Alumina Ceramic Foam Filter)
Applications: Filters for Molten Aluminum & Alloy: (aluminium
oxide)
Material: Alumina (Al2O3)
Working Temperture: ***0℃
Pore Size: *0,*0,*0,*0 PPI
Item 4: Foam-Mg (Magnesia Ceramic Foam Filter)
Due to magnesium alloy is more active than a lot of other
nonferrous metal, molten magnesium alloy can easily react with the
SiO2, Al2O3 and liquate alumina ceramic filter rapidly. so that
alumina ceramics is unable to filter magnesium alloy. We have
successfully produced magnesia foam ceramic filter to meet the need
of magnesium alloy recently.
Material : MgO
Applications: specialized for the casting filters of magnesia
alloy.
Product Selection
1) Select suitable temperature filter according to kinds of alloy,
the filter should
not exceed temperature and damage.
2) Select suitable bore density, purification is fit in with
quality of casting.
3) Select dimension of suitable filter, not increase time of
moulding.
4) Reduce the second dreg.
5) Porosity: filter ****0% when founding
Specifications
Circle Shape (mm): D*H D=*0～**0mm H=5～*0mm
Φ*0**2、Φ*5**5、Φ*0**5、Φ*5**5、Φ*0**5、Φ*0**0、Φ*0**0、Φ**0**5、Φ**0**5。
Square Shape (mm): L*W*H
L=*0～**0mm W=*0～**0mm H=*0～*0mm
All kinds of specifications are available on your request.
Note:
1) The product of other specifications can also be prepared
according to customers'
requirement.
2) PPI (Pores Per Inch), the ppi means the number of holes per
inch.
