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Product Details:
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| Model No.: | AFS20-25~AFS55-60 | Thermal Expansion Coefficient: | 6X10-6 /ºC(20-1000ºC) |
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| Type: | Heat-Resistant Material | Thermal Conductivity: | 0.698W/M.K(1200ºC) |
| Angularity: | Max 1.1 | Feature: | No Cracking |
| High Light: | 1850C Ceramsite Sand,1850C Ceramic Coated Silica Sand,2.2 g/cm3 Ceramic Coated Silica Sand |
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1. Ceramic Foundry Sand Introduction
Ceramic Foundry Sand, technically named as “Fused Ceramic Sand for Foundry”, also named as ceramite, is good spherical grain shape which is made from calcined bauxite. Its main content is aluminum oxide, and it is processed by melting, blowing, sieving and blending. Ceramic sand, has much better properties than that of silica sand to gain a better performance in foundry. It has high refractoriness, stable inert characteristics, excellent flowability, intrinsic hardness and wear resistance.
2. Ceramic Foundry Sand Specifications
| Sand Type | Linear thermal expansion | ||
| 20 – 300ºC | 20 – 600ºC | 20 – 800ºC | |
| Silica | 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 |
| Al2O3 | 78-86% |
| SiO2 | 8-13% |
| 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 | 113 |
3. Ceramic Foundry Sand General advantages
4. Ceramic Foundry Sand Particle Size Distribution
| 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 ºC |
| 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 /ºC(20-1000ºC) |
| Thermal conductivity | 0.698W/M.K(1200ºC) |
| Thermal expansion ratio | 0.12% |
| 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,AFS60-70,AFS70-80,AFS95-110 Customized sizes are available upon request | |
5. Ceramic Foundry Sand Applications
Silica sand in dry condition largely apply in Vacuum(V)-casting and Lost-foam casting (LFC).
Silica sand creates a lot of dust in process which is very bad for environment and for workers health.
Ceramsite has high refractoriness than silica sand and high density in the mold by what we can achieve high castings surface quality and decrease the unqualified castings rate.
Ball shape ceramsite has better flowability than silica sand, so it can fill the special area like inside angel, deep groove, horizontal holes easier than silica sand. So it will decrease the defects of the castings and decrease the labor volume.
According to our experience, the sand cost can decrease 90% compared to silica sand and also discharge if the waste material will also be decreased.
In LFC, if we use resin and ceramiste, the resin cost will also be decreased by 1/3.
Ceramsite price is higher than silica sand. But if we take the above advantage into consideration, ceramsite is also the good choice for you. As the ceramsite has lower expansion rate. When we produce, iron castings especially spheroidal graphite iron castings, casting mould has limited expansion resists on the castings expansion because of graphitization. So the castings may has shringage, to avoid which casting head is needed.
Contact Person: Jason Chen
Tel: 86-18603794999
