Description：
Ceramic sand is a kind of fused ceramic sand,it is made from calcined bauxite with main content aluminium oxide processed by melting,blowing,sieving and blending.
Characters:
1.Low thermal expansion coefficient
2.spherical shape,good flow ability,easy to shakeout
3.smooth surface,compact structure
4.chemically neutral material
5.high temperature resistance,good refractoriness
6.Recycle up to 10 times,highly cost effective.
7.Save resin consumption with casting tech such as shell molding,Resin coated sand casting,Vacuum casting,etc.
Performance comparison of ceramic foundry sand, Chromite sand and Zircon Sand:
|
Index
|
ceramic foundry sand
|
Chromite sand
|
Zircon Sand
|
|
PH value
|
7.65
|
4.56
|
8.24
|
|
Bulk Density(g/cm3)
|
1.95-2.05
|
2.9-3.1
|
2.6-2.7
|
|
True density(g/cm3)
|
3.4
|
4.4-4.71
|
3.9-4.8
|
|
Shape
|
Spherical
|
Irregular
|
Irregular
|
|
Amount of binder
(Waterglass+CO2hardening)
|
3%----4%
|
7%----8%
|
7%---8%
|
|
TYPICAL CHEMICAL ANALYSIS
|
|
AL2O3
|
70-75%
|
|
SiO2
|
8-20%
|
|
Fe2O3
|
≤3%
|
|
TiO2
|
≤3.5%
|
|
CaO
|
≤0.45%
|
|
MgO
|
≤0.35%
|
|
K2O
|
≤0.33%
|
|
Na2O
|
≤0.08%
|
|
|
|
|
TYPICAL PHYSICAL PROPERTIES
|
|
Refractoriness
|
≥1800 ℃
|
|
Specific gravity:
|
3.4g/cm3
|
|
Bulk density(LPD):
|
1.95-2.05 g/cm3
|
|
Color:
|
black brown
|
|
Grit shape:
|
spherical Ball
|
|
Thermal expansion coefficient
|
6x10-6 /℃(20-1000℃)
|
|
Thermal conductivity
|
0.698W/M.K(1200℃)
|
|
Thermal expansion ratio
|
0.13%
|
|
Angularity
|
≤1.1
|
|
Available sizes
|
|
AFS15-20,AFS 15-25,AFS25-35,AFS25-30,AFS30-35,AFS35-40,AFS40-45,AFS45-50,AFS40-50,AFS50-55,AFS55-60,AFS60-65 Customized sizes are available upon request
|
Sizes for different casting applications：
|
Applications
|
AFS SIZE
|
Grit Size
|
|
Foundry sand for Lost foam
|
AFS25-35
|
8-15#（10#）10-20#，20-30#
|
|
Filler sand
|
|
30#
|
|
No bake sand including furan resin /alkaline-phenolic resin molding and core making/ Pep set /Sodium-silicate bonded sand
|
AFS35-45,AFS25-35,AFS45-55,
AFS55-65,AFS60-70,AFS70-80
|
30-50#,40-70#,50-70#,70-140#
|
|
Shell molding, resin coated sand casting
|
AFS55-65,AFS60-70,AFS70-80,
AFS95-110
|
50-100#,70-140#,100-200#
|
|
Lost foam casting coating
|
|
140-270#,-200#
|
|
Molding sand alcohol-based coating
|
AFS SIZE
|
-200#
|
|
3D printing, precision casting, investment casting
|
AFS25-35
|
-140#
|
Applications:
- Raw material for ladle filler sand
- Shell molding
- Precision Casting
- Lost foam casting
- Heavy steel casting
- Resin coated sand casting
- Vacuum casting
- Investment casting
