99% Alumina Ceramic Plates High-Purity Alumina Ceramic Plates with Multiple Holes

Alumina ceramic plates with multiple holes are flat plates made of high-purity alumina (Al₂O₃, commonly 96% or 99% purity) ceramic. They are machined with a large number of precisely arranged holes according to design requirements. These holes can be round, square, or irregularly shaped, arranged in straight or oblique patterns, and have specific hole diameters, hole spacing (pitch), and porosity.

They are typically manufactured through dry pressing and isostatic pressing, followed by high-temperature sintering, and finally punched using precision machining techniques.

This type of ceramic plate combines the material advantages of alumina with the structural advantages of multiple holes:

1. Material Properties:

• High Hardness & High Wear Resistance: Resists material erosion and offers an extremely long service life.
• High Temperature Resistance: Operates in environments exceeding 1500°C.
• Corrosion Resistance: Resists acid, alkali, and solvent attack, and resists rust.
• High Strength and Rigidity: Resists deformation under high pressure or vacuum.
• Insulating & Non-Magnetic: Suitable for use in specialized environments.

2. Functions of Porous Structures:

• Precise Filtration and Diversion: Pore size and distribution can be precisely controlled for separation, screening, or uniform distribution of fluids/gases.
• Permeability and Barrier Properties: Allows media to pass through while blocking particles larger than the pore size.
• Large Surface Area: Provides ample surface area for chemical reactions, catalysis, or coatings.
• Weight Reduction: Reduces material usage and weight while maintaining structural strength.

The applications of alumina ceramic plates with multiple holes are extremely diverse, almost entirely determined by their hole diameter and performance:

1. As distributors and diffusers

Applications: Used as gas distribution showerheads in semiconductor manufacturing (CVD, PVD, etching equipment) and photovoltaic (LPCVD) equipment. 
Function: Uniformly and smoothly injects reactant gases (such as silane and hydrogen nitride) into the reaction chamber through countless micropores, forming a uniform plasma. This is a key component for forming uniform thin films (such as SiO₂ and Si₃N₄). The pores must be extremely precise and highly clean.

2. As a Filter and Separator Plate
Applications:

• Molten Metal Filtration: In the foundry industry, it is used to filter inclusions and slag from molten aluminum, copper, and cast iron, significantly improving casting quality.
• Chemical Filtration: Used to filter corrosive chemicals and catalysts.
• High-Temperature Flue Gas Dust Removal: Serves as a core filter component, capturing dust particles.

Function: Utilizes different pore sizes to block particles of specific sizes and purify the medium.

3. As a Fixing and Support Plate
Applications:

• Catalyst Carrier: Coating catalysts onto ceramic plates with multiple pores for automotive exhaust purification or industrial chemical reactors. The large surface area provides abundant reaction sites.
• Sintering Setter: Used to support products in sintering furnaces for electronic ceramics and lithium battery materials. Holes facilitate the circulation of hot air, ensuring more even heating.
• Vacuum chucks: In semiconductor and flat panel display manufacturing, vacuum pressure is used to secure silicon wafers and glass substrates through micropores, ensuring a flat and flawless surface.

4. As a flame-retardant and breathable plate
Applications: Used in battery safety valves and electrical equipment housings.
Function: Allows internal gas to slowly escape when pressure rises, preventing explosions, while also blocking external flames from entering, providing explosion-proof and flame-retardant properties.

5. As an acoustic and heat sink
Applications: Used in speaker diaphragms for high-end audio equipment and mufflers for industrial equipment.
Function: Its porous structure aids in the conduction or attenuation of sound waves. Furthermore, the multiple holes in the structure facilitate heat dissipation.