In aluminum alloy production, alumina ceramic foam filters are a key equipment, and their porosity is crucial to the filtering effect. Alumina foam ceramic filters with different pore sizes (such as 10PPI, 15PPI, 20PPI, 25PPI, 30PPI and 40PPI) have differences in filtering effects and applicable scenarios.
Effect of Porosity on Filtering Effect
- Small porosity (higher PPI value): Small pore size helps to filter fine impurities, but it is easy to clog and increase the resistance of liquid passage.
- Large porosity (lower PPI value): Large pore size is conducive to liquid flow, but may cause fine impurities to pass through.
Characteristics of Different Types of Alumina Ceramic Foam Filters
- 10PPI: Good permeability, but weak filtering effect, suitable for processes with low filtering requirements.
- 15PPI: Balance permeability and filtering effect, suitable for general aluminum alloy casting.
- 20PPI: Good filtering performance and permeability, suitable for casting of various aluminum alloys.
- 25PPI: Better filtering effect, suitable for production with high requirements for product quality.
- 30PPI: Efficient filtering effect, suitable for aluminum alloy casting with high quality requirements.
- 40PPI: Excellent filtering effect, suitable for production with particularly high requirements for aluminum liquid purity.
How to Choose the Appropriate Pore Size of Ceramic Foam Filters
- Product requirements: Select the appropriate pore size according to the product quality requirements, balancing the filtering effect and permeability.
- Production process: Consider the characteristics and requirements of the production process and select the appropriate pore size.
- Impurity type: Select the appropriate filter according to the type and content of impurities in the aluminum liquid.
Other Factors Affecting the Filtering Effect of Aluminum Liquid
In addition to the PPI value, there are other factors that affect the filtering effect of aluminum liquid:
- Filter structure: The design and structure of the filter will affect the filtering effect.
- Filter quality: The manufacturing quality of the filter determines its performance.
- Operating temperature: High temperature may affect the effect of the filter.
- Aluminum liquid quality: The type and content of inclusions in aluminum liquid are also one of the influencing factors.
In summary, choosing an alumina ceramic foam filter with an appropriate pore size is a key factor in ensuring the quality of aluminum products. When selecting a filter, factors such as product requirements, production process and aluminum liquid quality need to be considered to ensure the best filtration effect and production efficiency.