Silicon Carbide Porous Foam honeycomb Ceramic Filter
Foam ceramic filter products are ceramic products with foam-like porous structure made by a special process. They have many advantages such as stable chemical properties, high strength, high temperature resistance, good thermal shock resistance, and large specific surface area. They are widely used. In metallurgy, casting, environmental protection and other fields.
| Model | BHA | BHS-1 | BHS-2 |
| Materials | Alumina (Al2O3) | Silicon Carbide (SiC) | Silicon Carbide (SiC) |
| Suitable for filtering molten metal types | Aluminum alloy | Copper alloy, gray iron casting | Ductile Iron Casting |
| Operating temperature (℃) | 1200 | 1500 | 1550 |
| Perforation Density (ppi) | 10～40 | 8～25 | 8～25 |
| Metal filtration per unit volume (kg/cm2) | 1～1.5 | 3～5 | 3～5 |
| open cell ratio（%） | 80～90 | 80～90 | 80～90 |
| Compressive strength at room temperature (MPa) | ≥0.8 | ≥1.0 | ≥1.2 |
| Bulk density (g/cm3) | 0.35～0.5 | 0.35～0.5 | 0.35～0.5 |
Features:
1. Reduce the rejection rate of castings and reduce porosity defects
2, has a very significant filtering effect
3. Improve the mechanical ability of castings
4. Simplify the gating system and improve the utilization rate of the template
5. Has a large metal flow rate, and the flow rate is stable
6. Higher working strength at high temperature, thermal shock resistance and metal flow impact resistance
7. Reduce machining time and tool damage
8. Has very high dimensional accuracy.
Application:
1. Place in the pouring cup or the bottom of the sprue
2. It is placed horizontally on the runner, so that the molten metal can be filled smoothly, avoiding direct impact on the filter or placing it vertically on the runner. The flow rate of the molten metal is fast and it has a good filling ability.
3. The size of the filter should be determined according to factors such as modeling and smelting and the characteristics of the filter itself.
4. The casting head should be controlled as much as possible to reduce the impact of the molten metal on the filter
5. The filter should not be used over temperature
6. Avoid using filters to control casting speed
Select filter size and mesh size:
1. Consider the cleanliness of the molten metal and the pouring temperature
2. Consider the pouring iron head and calculate the flow control area to meet the requirements of the pouring time
3. Try to use an open gating system to avoid air entrapment
4. Calculate and select the filter area according to the filtering capacity and pouring time requirements. The filtering capacity of the silicon carbide foam ceramic sheet (Kg/cm2): Gray iron: 4.0 Ductile iron: 2.0 Alloy cast iron: 1.0-2.0
5. General gray iron uses 20ppi, ductile iron uses 10ppi. 15 or 25ppi can also be selected, and the mesh selection is related to many factors in the actual pouring.
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