High Purity Ceramic Foundry Sand 200Mesh Coating Sand Balls Shape
1. Ceramic Foundry Sand Introduction
The coastings foundry sand is a raw material for foundry coastings in the lost foam process(policast process), also known as foundry coasting sand. It is a fine sand, alias high alumina powder, which is filtered by 200 mesh screen.
Ingredients: alumina, bauxite as raw material, processed by high-temperature calcination, aluminum smelting, milling and selected with 200 mesh screen.
Production process of coated sand can be a dry blend method, cold coating method, temperature coating method and a thermal coating method four stages, but now the commonly used production method are thermal coating method.
Thermal coating process: Heat the raw sand to a certain temperature first, then mix it with the resin, solution and calcium stearate, cooling, crushing and screening. Different mixing system are adopted due to differences in formulation.
2. Ceramic Foundry Sand Specifications
Thermal expansion :
| Sand Type | Linear thermal expansion [10-6·K-1] | ||
| 20 – 300ºC | 20 – 600ºC | 20 – 800ºC | |
| Silice | 14.0 | 23.0 | 17.0 |
| Chromite | 7.1 | 7.5 | 7.5 |
| Zircon | 3.4 | 4.1 | 4.5 |
| Cerabeads | 3.5 | 4.0 | 4.3 |
| Ceramsite | 7.1 | 7.3 | 7.2 |
Composition :
| Al2O3 | 78-85% |
| SiO2 | 8-12% |
| Fe2O3 | 3.5% (max) |
| TiO2 | 3.5% (max) |
| Refractoriness | 1850C (3362F) |
| Angle Coefficient | 1.1 (max) |
| Thermal Expansion (at 100°C) | 0.15 |
| Thermal Conductivity | 0.196 W/m.K |
| Specific Heat | 873 J/kg |
| Bulk Density | 1.9-2.2 g/cm3 |
| pH Value | 7.65 |
| Shape | Solid Sphere |
| Binder Content Required | 3-4% |
| Crushability | 112 |
3. Ceramic Foundry Sand General advantages
High AI2O3 mineral composition
- Higher Refractoriness than Silica based sands (around 1850 C°)
- Much lower Thermal Expansion compared to Chromite and Zircon based sands
- Compatible with existing resin systems
Regular spherical shape
- Provide highly smooth surface
- Reduce binder addition
- Excellent air permeability and dispensability (reduce cleaning cost)
100% recyclable
- Cost reduce (up to around 42 times against 5-10 times for chromite based sands)
- Environment respect and health safety
4. Ceramic Foundry Sand Particle Size Distribution
The particle size distribution can be custom-made according to any customer’s specific requirement.
|
Code |
1700 |
850 |
600 |
425 |
300 |
212 |
150 |
106 |
75 |
53 |
Pan |
|
|
20-40 |
|
15-40 |
30-55 |
15-35 |
≤3 |
|
|
|
|
|
|
15-25 |
|
30-50 |
|
≤10 |
25-45 |
35-55 |
5-15 |
≤5 |
≤2 |
|
|
|
|
25-29 |
|
40-70 |
|
|
≤10 |
25-45 |
20-40 |
5-25 |
≤7 |
≤5 |
|
|
|
35-39 |
|
40-100 |
|
|
≤3 |
10-25 |
25-40 |
25-45 |
10-25 |
≤10 |
≤5 |
|
|
45-55 |
|
50-100 |
|
|
|
≤10 |
10-30 |
30-50 |
15-35 |
≤15 |
≤5 |
≤2 |
≤1 |
55-65 |
|
50-140 |
|
|
|
≤8 |
10-25 |
20-45 |
20-45 |
5-20 |
≤7 |
≤2 |
≤1 |
60-70 |
|
70-140 |
|
|
|
|
≤10 |
10-25 |
25-45 |
15-35 |
≤15 |
≤5 |
≤2 |
75-85 |
|
100-200 |
|
|
|
|
|
≤3 |
10-35 |
35-55 |
15-35 |
≤10 |
≤5 |
95-115 |
|
140-270 |
|
|
|
|
|
|
≤5 |
5-25 |
40-60 |
25-40 |
≤15 |
155-175 |
|
6-20 |
LFC Casting Ceramsite |
|
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5. Ceramic Foundry Sand Application Area and its advantage compare to traditional casting sand
|
Applications |
Grit Size |
AFS SIZE |
|
Foundry sand for Lost foam |
8-15#(10#)10-20#,20-30# |
AFS25-35 |
|
Filler sand |
30# |
|
|
No bake sand including furan resin /alkaline-phenolic resin molding and core making/ Pep set /Sodium-silicate bonded sand |
30-50#,40-70#,50-70#,70-140# |
AFS35-45,AFS25-35,AFS45-55, AFS55-65,AFS60-70,AFS70-80 |
|
Shell molding, resin coated sand casting |
50-100#,70-140#,100-200# |
AFS55-65,AFS60-70,AFS70-80, AFS95-110 |
|
Lost foam casting coating |
140-270#,-200# |
|
|
Molding sand alcohol-based coating |
-200# |
|
|
3D printing, precision casting, investment casting |
-140# |
|
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