Ceramic fused sand is an advanced foundry material that offers superior properties compared to traditional silica sand.
1. What is Ceramic Fused Sand?
A synthetic sand made by melting and spheroidizing high-purity alumina or zirconia at high temperatures.
Forms spherical, dense particles with high refractoriness and thermal stability.
2. Key Properties
High Refractoriness (up to 1800°C) – Suitable for high-temperature alloys (steel, iron, superalloys).
Low Thermal Expansion – Reduces casting defects like veining and metal penetration.
Chemically Inert – Resists reactions with molten metal, improving surface finish.
Spherical Shape – Enhances flowability and reduces binder usage (~30% less than silica sand).
Reusability – Can be reclaimed multiple times with minimal degradation.
| Chemical Analysis[%] | |
| Al2O3 | 70-73 |
| SiO2 | 8-20 |
| Fe2O3 | ≤3 |
| TiO2 | ≤3.5 |
| CaO | ≤0.45 |
| MgO | ≤0.35 |
| K2O | ≤0.33 |
| Na2O | ≤0.08 |
| Physical Properties | |
| Grain shape | Spherical Ball |
| Roundness | 90% |
| Refractoriness: | ＞1790℃ |
| Shape Coefficient | ≤1.1 |
| Thermal Expansion Ratio | 0.13%（Heated up for 10 min at 1000℃） |
| Thermal expansion coefficient | 6×10-6 /℃(20-1000℃) |
| Thermal conductivity | 0.698W/M.K(1200℃) |
| Specific Gravity:: | 1.95-2.05g/cm3 |
| Bulk density(LPD): | 3.4 g/cm3 |
| Color: | Black |
| AVAILABLE SIZES | |
| AFS25-35,AFS35-45,AFS45-55,AFS55-65,AFS60-70,AFS70-80,AFS95-110 Customized sizes are available upon request | |
3. Applications in Foundries
Cores & Molds – Used in precision casting (investment, shell molding).
High-Performance Alloys – Ideal for steel, stainless steel, and Ni-based superalloys.
Complex Geometries – Better dimensional accuracy due to low expansion.
4. Advantages Over Silica Sand
✔ Less Veining & Rat Tails (due to low thermal expansion).
✔ Better Surface Finish (reduced metal penetration).
✔ Lower Binder Consumption (cost savings).
✔ Environmentally Friendlier – Less waste generation, reusable.