Alumina Ceramic Rods

Alumina ceramic rods are a high-performance fine ceramic material with a wide range of applications and excellent physical and chemical properties.

 

Manufacturing process

Molding technology: It uses a variety of processes such as isostatic pressing, dry pressing, extrusion, and injection molding. Among them, isostatic pressing is suitable for complex shapes, and the extrusion process can produce rods with a diameter of 0.5-90 mm and a length of up to 1000 mm.

Sintering and processing: After sintering, precise size control is achieved through diamond grinding, CNC processing or laser cutting. The surface roughness can be as low as mirror level, and the tolerance accuracy can reach micron level.

Mechanical properties

• High strength and wear resistance: The bending strength of alumina ceramic rods can reach 45-300 MPa, the compressive strength is as high as 400-2000 MPa, and the density is 3.5-3.9 g/cm³ (only half of steel), which is both lightweight and high-strength. Its Vickers hardness (HV0.5) reaches 1400-1600, and the Mohs hardness is 9, second only to diamond, with excellent wear resistance.
• Improved toughness: Through toughening treatment, ceramic rods show better fracture resistance in mold materials and other fields.

Thermal properties

• High temperature resistance: The working temperature can reach 1500-1750℃, the short-term tolerance temperature can reach 1800℃, and it has a low thermal expansion coefficient and excellent thermal shock resistance.
• Thermal conductivity: The thermal conductivity of high-purity (99%) alumina is 29-32 W/(m·K), which is suitable for high-temperature heat dissipation scenarios.

Electrical and chemical properties

• Insulation: Volume resistivity>10¹⁴ Ω·cm, dielectric strength 15-20 kV/mm, ideal electrical insulation material for high temperature environments.
• Corrosion resistance: Strong resistance to acids, alkalis and chemical solvents, suitable for chemical corrosion environments.

• High temperature industry: Alumina ceramic rods can be used as furnace tubes, rollers, thermocouple protectors, etc., for metallurgy, glass manufacturing and heat treatment equipment.
• Electronics and semiconductors: Used for CVD reactors, ion implantation equipment, photolithography machine parts and insulators. Materials with a purity of more than 99% meet high cleanliness requirements.
• Mechanical and chemical industry: Used as wear-resistant shaft rods, sealing rings, nozzles and corrosion-resistant pipes to extend equipment life.
• Emerging fields: Gradually expanding in aerospace (high temperature resistant structural parts), medical (surgical instruments) and new energy (fuel cell components).

• Purity selection:

95% alumina: Low cost, suitable for general wear-resistant scenarios (such as textile machinery), temperature resistance of 1500℃.

99%-99.8% alumina: High performance demand scenarios (such as semiconductors), temperature resistance of 1750℃ and mechanical strength increased by 10-15%.

• Processing requirements: Dimensional tolerances (such as roundness ≤ 0.01 mm), surface treatment (polishing/thread) and special structures (hollow/conical) must be clearly defined.
• Environmental adaptation: High thermal conductivity models are preferred in high temperature environments, and chemical stability must be ensured in corrosive media.