Spherical Ceramic Foundry Sand AFS20 AFS25 Low Broke Rate
1. Ceramic Foundry Sand Introduction
Ceramic Foundry Sand is widely used in various casting ways ( investment casting, full mold casting, lost foam casting and so on ); It is a new type casting sand used in precision casting, resin coated sand,self-hardening sand. In particular, it has the characteristic of low expansion sintering, no pulverization, no cracking, no sand sticking (to eliminate the negative impact of casting quality), good regeneration performance, and improve the casting yield.
2. Ceramic Foundry Sand Specifications
Thermal expansion :
| Sand Type | Linear thermal expansion | ||
| 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 |
Compositions:
| 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 | 113 |
3. Ceramic Foundry Sand General advantages
1. Low thermal expansion coefficient;
2. High strength with good compressive strength and bending resistance ability and low broke rate;
3. spherical shape, good flowability, easy to shakeout;
4. smooth surface, compact structure;
5. chemically neutral material;
6. high-temperature resistance, good refractoriness;
7. Recycle up to 40 times.
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
1,Widely used in foundry technique like resin-bonded sand, sodium silicate sand, and clay- bonded sand for sand core and casting mould making.
2,Replace chromite sand and widely used in sand core making like jacket core, oil duct core, tappet core of engine.
3,Replace chromite sand for steel casting facing sand and sub-layer of molding sand (backing sand).
4,Widely used as dry sand and sand box for EPC process and V method of casting processes.
5,Widely used as the main raw materials of advanced refractory products (Ladle drainage sand,gravity casting material, casting coating, etc.).
6,Widely used as cleaning sand for copper and aluminum alloy castings.
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