Zirconia Ceramic Foam Filter is a premium molten metal filtration solution specifically engineered for high-temperature steel and alloy casting processes. Manufactured from stabilized zirconium dioxide (ZrO₂), this filter offers exceptional thermal stability, chemical inertness, and inclusion removal efficiency, even under the most demanding casting environments.
Designed with a uniform open-cell foam structure, zirconia foam filters effectively trap non-metallic inclusions while maintaining smooth metal flow, helping foundries achieve cleaner melts, improved mechanical properties, and higher casting yield.
1.High-Efficiency Filtration – Effectively removes non-metallic inclusions.
2.Ultra-High Temperature Stability – Reliable performance up to 1700 °C.
3.Excellent Chemical Inertness – Safe for molten steel and alloy melts.
4.Strong & Thermal Shock Resistant – Durable foam structure resists cracking.
5.Customizable Options – Multiple PPI grades, sizes, and shapes available.
Zirconia ceramic foam filters are specially designed for high-temperature steel and alloy casting processes, including carbon steel, stainless steel, and high-alloy steel casting. They effectively remove non-metallic inclusions, reduce melt turbulence, and ensure cleaner metal flow under extreme pouring conditions.
In addition to steel, zirconia foam filters are also suitable for special alloy and precision casting applications where superior thermal stability and chemical inertness are required. Available in multiple PPI grades and shapes, they can be easily integrated into various gating systems and filtration setups in modern foundries.
| Item | Typical Value |
| Chemical Composition | ≥ 94–96 % ZrO₂ |
| Apparent Porosity | 80–90 % |
| Bulk Density | 0.45–0.65 g/cm³ |
| Cold Crushing Strength | ≥ 1.0 MPa |
| Maximum Service Temperature | ≤ 1700 °C |
| Thermal Shock Resistance | Excellent |
| Pore Density (PPI) | 10 / 20 / 30 PPI |
Note: Specifications can be adjusted according to application requirements.
Zirconia Ceramic Foam Filter is a premium molten metal filtration solution specifically engineered for high-temperature steel and alloy casting processes. Manufactured from stabilized zirconium dioxide (ZrO₂), this filter offers exceptional thermal stability, chemical inertness, and inclusion removal efficiency, even under the most demanding casting environments.
Designed with a uniform open-cell foam structure, zirconia foam filters effectively trap non-metallic inclusions while maintaining smooth metal flow, helping foundries achieve cleaner melts, improved mechanical properties, and higher casting yield.
Key Advantages
Ultra-high temperature resistance (up to 1700 °C)
Excellent chemical stability against molten steel and alloys
Superior inclusion removal with low pressure drop
Stable pore structure and consistent filtration performance
Available in multiple PPI grades and customizable sizes
👉 Request Technical Datasheet | Get a Quotation
A Zirconia Ceramic Foam Filter is a three-dimensional porous ceramic filter used in molten metal filtration systems. It is placed in the gating system during pouring to remove slag, oxides, and other non-metallic inclusions from molten metal before it enters the mold cavity.
Unlike conventional alumina or silicon carbide filters, zirconia foam filters are specifically developed for extreme temperatures and chemically aggressive melts, such as carbon steel, stainless steel, and high-alloy steel.
The filter’s interconnected open-cell structure forces molten metal to flow through tortuous paths. During this process:
Large inclusions are mechanically trapped
Fine inclusions adhere to the ceramic surface
Flow turbulence is reduced, creating a more laminar metal stream
The result is cleaner molten metal, fewer casting defects, and improved consistency across production batches.
Zirconium dioxide is widely recognized as one of the most advanced high-temperature ceramic materials. Its unique properties make it particularly suitable for demanding filtration applications:
Extremely high melting point
Ensures structural integrity under prolonged exposure to molten steel.
Outstanding thermal shock resistance
Minimizes cracking during sudden temperature changes.
Excellent chemical inertness
Resists corrosion and reaction with molten steel and alloy elements.
Low wettability with molten metal
Prevents metal penetration and blockage, ensuring stable filtration.
These properties allow zirconia foam filters to perform reliably where other ceramic materials may soften, react, or degrade.
| Property | Zirconia (ZrO₂) | Alumina (Al₂O₃) | Silicon Carbide (SiC) |
| Max Service Temperature | ★★★★★ | ★★★★☆ | ★★★☆☆ |
| Chemical Stability in Steel | ★★★★★ | ★★★★☆ | ★★☆☆☆ |
| Thermal Shock Resistance | ★★★★☆ | ★★★☆☆ | ★★★★☆ |
| Suitable for High-Alloy Steel | Yes | Limited | Not recommended |
| Typical Applications | Steel, stainless, superalloys | Cast iron, aluminum | Iron, non-ferrous |
Conclusion: For steel and high-alloy casting, zirconia foam filters provide the most reliable and stable filtration performance.
50 × 50 × 22 mm
75 × 75 × 25 mm
100 × 100 × 25 mm
150 × 150 × 25 mm
Square
Rectangular
Round
Customized shapes for special gating systems
Customized thickness and dimensions
Tailored PPI grades for specific flow rates
Composition optimization for special alloy melts
OEM and private-label solutions available
👉 Tell us your casting parameters — we help you select the right filter.
Zirconia ceramic foam filters are widely used in high-temperature and high-purity casting processes, including:
Carbon steel
Low-alloy steel
Structural steel components
Austenitic and martensitic stainless steels
Precision cast components with high surface quality requirements
Tool steels
Heat-resistant steels
Wear-resistant alloys
Complex geometries requiring clean metal flow
Thin-wall castings sensitive to inclusions
Filter boxes
Runners and pouring cups
Choosing the correct filter is critical for achieving optimal filtration performance.
10 PPI – Large inclusions, high flow rate
20 PPI – Balanced filtration for most steel castings
30 PPI – Fine filtration for high-quality or precision components
Match filter area to pouring rate
Ensure sufficient thickness for inclusion capture without excessive pressure drop
Higher alloy content → higher chemical aggressiveness
Higher pouring temperature → zirconia recommended
Choosing too fine PPI, causing flow restriction
Undersized filters leading to breakthrough inclusions
Ignoring preheating requirements
Recommended preheating to remove moisture
Avoid thermal shock by gradual heating
Securely placed in the gating or filter box
Ensure full metal flow through the filter surface
Maintain stable pouring rate
Avoid direct metal impact on filter edges
Skipping preheating
Improper filter alignment
Excessive pouring speed
Every zirconia ceramic foam filter undergoes strict quality control procedures to ensure consistent performance:
High-purity zirconia raw material selection
Controlled foaming and pore structure formation
High-temperature sintering for strength and stability
Dimensional inspection and porosity testing
Mechanical strength and thermal shock testing
This ensures uniform pore distribution, reliable strength, and repeatable filtration results in industrial production.
Q1: What metals are zirconia foam filters suitable for?
A: Primarily carbon steel, stainless steel, high-alloy steel, and special alloys.
Q2: What is the maximum service temperature?
A: Up to approximately 1700 °C under normal casting conditions.
Q3: How do I choose the correct PPI?
A: It depends on metal cleanliness requirements, pouring rate, and casting complexity.
Q4: Can you customize sizes and shapes?
A: Yes, custom dimensions, shapes, and PPI grades are available.
Q5: How does zirconia compare with alumina filters?
A: Zirconia offers better high-temperature stability and chemical resistance for steel casting.
Q6: How should filters be stored?
A: Store in a dry environment, protected from moisture and mechanical damage.
Our technical team is ready to help you select the most suitable Zirconia Ceramic Foam Filter for your casting process.
📄 Request Technical Datasheet
💬 Free filter selection consultation
📦 Sample support available
⚙️ Customized solutions for your foundry
👉 Contact us today to improve your molten metal quality and casting yield.
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