99% Alumina Ceramic Ring With Internal Teeth for Lithium Battery Material Handling

• Ultra-high mechanical strength and wear resistance: With a density exceeding 3.90 g/cm³, 99% alumina ceramic offers a flexural strength of up to 330 MPa at room temperature and a Mohs hardness of 9. The internal gear meshing surfaces show no significant wear or deformation even under prolonged, high-frequency friction, resulting in a service life several times longer than that of metal internal gear rings.
• Excellent chemical stability: Extremely low impurity content ensures immunity to corrosion in the vast majority of acidic, alkaline, and oily media. It completely eliminates the rusting and media contamination issues common with metal rings, making it suitable for high-purity production environments.
• Outstanding high-temperature resistance and thermal stability: Capable of stable operation at temperatures up to 1600°C, it features a low linear expansion coefficient (7–8 × 10⁻⁶/℃). Even under conditions of drastic temperature fluctuation, the internal gear's geometric tolerances remain unaffected, ensuring highly stable structural dimensions.
• Superior electrical insulation: With a volume resistivity exceeding 10¹⁷ Ω·cm at 100°C and a dielectric strength of up to 18 kV/mm, it completely eliminates the risk of arc breakdown in high-voltage applications, serving the dual functions of power transmission and electrical insulation.
• Adaptability to specialized internal gear structures: The integrally formed internal spline gear profile avoids the stress concentration at the tooth root—often caused by mismatched thermal expansion and contraction in composite metal structures—resulting in smoother operation during transmission without abnormal noise or wear.

1. Corrosion-resistant and metal-contamination-free transport in the chemical and lithium battery industries

This is one of the most typical application scenarios for alumina ceramic internal gear rings. 

• Operating Conditions: In pumps transporting highly corrosive fluids (such as strong acids or alkalis) or in transport systems for lithium-ion battery cathode and anode materials, contamination of the medium by metal debris or dust is strictly prohibited.
• Function: Serves as an internal gear or internal gear ring for corrosion-resistant or precision metering pumps. Ceramic materials are impervious to acid and alkali corrosion and possess extreme hardness, preventing wear-induced particle shedding and ensuring fluid purity.

• Operating Conditions: High-precision devices—such as semiconductor wafer manufacturing equipment and vacuum coating systems—often operate in high-temperature, ultra-clean environments and require superior electrical insulation. 
• Function: Serves as an insulating gear transmission sleeve. Leveraging the ceramic's excellent insulation, vacuum compatibility, and high-temperature resistance, it transmits torque while electrically isolating components to block static electricity or high-voltage currents and prevent arcing.

• Operating Conditions: In high-frequency electromagnetic environments—such as microwave heating systems, radar communication equipment, and high-frequency induction furnaces—standard metal components can overheat or even melt. 
• Function: Serves as a wave-transparent transmission shaft sleeve or gear. Alumina ceramics offer excellent dielectric properties and a low loss tangent, allowing microwaves or high-frequency beams to pass through without loss; this makes them ideal for mechanical transmission within high-frequency energy fields.

• Operating Conditions: Couplings made of standard rubber or nylon soften, deform, or outgas at temperatures exceeding 150°C, leading to failure. 
• Function: Serves as the internal gear sleeve for high-temperature-resistant couplings. Ceramics maintain exceptional mechanical strength and dimensional stability at temperatures reaching several hundred degrees Celsius, serving as a perfect replacement for nylon or metal couplings to ensure precision transmission with zero deformation and zero outgassing.