99 Alumina Ceramic Comprehensive Performance Parameter Analysis

99% Alumina Ceramic is a high-performance material with α-Al₂O₃ as its main crystalline phase. Its alumina content exceeding 99% endows it with a series of excellent physical and chemical properties. Below is a detailed introduction to its core performance parameters:

I. Mechanical Properties

High Hardness: Mohs hardness up to Grade 9 (second only to diamond), with excellent wear resistance.

Strong Compressive Strength: Up to 2000-3000MPa at room temperature, capable of withstanding heavy loads.

High Rigidity: Elastic modulus of approximately 350GPa, not easily deformed.

II. Thermal Properties

High Temperature Resistance: Long-term service temperature up to 1600-1700℃, melting point at 2050℃.

Good Thermal Conductivity: Room-temperature thermal conductivity of about 30W/(m·K), excellent heat dissipation performance.

Low Thermal Expansion Coefficient: Approximately 7.2×10⁻⁶/℃, outstanding thermal stability.

III. Electrical Properties

Excellent Insulation: Room-temperature volume resistivity >10¹⁴Ω·cm, maintaining good insulation even at high temperatures.

High Dielectric Strength: About 15-20kV/mm, with high breakdown voltage.

Moderate Dielectric Constant: 8-10 (at 1MHz), suitable for high-frequency circuits.

IV. Chemical Stability

Corrosion Resistance: Resists acid and alkali corrosion (except hydrofluoric acid and hot concentrated alkali solutions).

Biological Inertness: Non-toxic and harmless, suitable for medical implants.

V. Other Characteristics

Density: 3.7-3.9g/cm³

Surface Finish: Can be polished to a mirror-like surface, with surface roughness Ra<0.1μm

Thanks to these properties, 99% Alumina Ceramic is widely used in electronic substrates, mechanical seals, wear-resistant components, medical implants, and high-temperature equipment. It is an indispensable key material in modern industry and technology.