Alumina porous ceramic plunger

Alumina porous ceramic plungers are functional components that combine the excellent physical properties of alumina ceramics with a controllable porous structure, primarily used in high-precision fluid control and filtration/separation applications. Their core characteristics and industry applications are as follows:

Core Performance Advantages

1. High Porosity and Precision Filtration:  Surface porosity (5%-40%) is controlled through the sintering process, with pore sizes ranging from 0.1 to 50 μm, enabling micron-level particle filtration. This is suitable for applications such as pharmaceutical purification and chemical raw material purification. The uniform pore distribution results in low pressure loss during fluid flow, avoiding the clogging problems of traditional filter elements.

2. Extreme Environment Adaptability:

• High Temperature Resistance: Withstands high temperatures of 1600℃ for extended periods (1800℃ short-term), suitable for metallurgical molten metal filtration and high-temperature gas purification systems.

• Corrosion Resistance: Resists strong acids (except concentrated hydrochloric acid and hydrofluoric acid), strong bases, and organic solvents. In chemical reactor conveying systems, its lifespan can be 10 times longer than metal components.

• Wear Resistance: With a Mohs hardness of 9, the wear rate is only 1/10 of metal plungers in the transportation of slurries containing solid particles (such as petroleum fracturing fluid).

3. Structural Stability and Cleanliness: Low thermal expansion coefficient (7.6×10⁻⁶/℃), resulting in minimal dimensional changes under high-temperature conditions, ensuring sealing accuracy. Non-toxic and non-leaching, meeting FDA food and pharmaceutical grade standards, used in insulin pumps with a dosing error of ≤0.1 μL.

Application Fields

1. New Energy and High-End Manufacturing:

• Lithium-ion battery electrolyte injection pump: Porous structure enables stable electrolyte delivery, with pulsation amplitude <1%, improving the uniformity of electrode coating and extending pump core life to 5000 hours (metal pump core life is approximately 500 hours).

• Hydrogen fuel cells: As a gas diffusion layer support, it is resistant to hydrogen embrittlement and corrosion, increasing system lifespan by 15%.

2. Chemical Industry and Environmental Protection:

• High-purity chemical filtration: In semiconductor etching solution production, it removes impurity particles ≥0.5μm, achieving a purity of 99.999%.

• Sludge dewatering equipment: Corrosion-resistant porous structure improves dewatering efficiency by 40%, and extends maintenance cycles by 3 times.

3. Biomedicine:

• Aseptic filling system: Mirror-grade surface treatment (Ra≤0.02μm) prevents microbial adhesion, reducing equipment cleaning frequency by 80%.

Supports custom specifications.