What is Alumina Ceramic and its Types

1. What is alumina ceramic?

Aluminum oxide ceramic (Al₂O₃ ceramic) is an advanced ceramic material mainly composed of high-purity aluminum oxide, which is made through precision sintering technology. Compared with traditional ceramics, its unique crystal structure and densification preparation technology endow it with excellent mechanical strength, thermal stability, and chemical inertness. With its hardness second only to diamond, as well as excellent wear resistance, corrosion resistance, insulation, and biocompatibility, alumina ceramics have become the core material in strategic fields such as electronic power, high-end equipment, biomedicine, and new energy.

2. Classification and characteristics of alumina ceramics

According to the differences in alumina content and microstructure, it can be divided into three categories:

Ultra high purity alumina (over 99.9%)

The content of grain boundary impurities is extremely low, and the transmittance can reach over 80%

Temperature resistance exceeding 1800 ℃, dielectric loss below 10 ⁻⁴

Mainly used in cutting-edge fields such as laser tube windows, semiconductor etching rings, artificial joints, etc

High purity alumina (95% -99.8%)

Industrial grade choice that combines strength and economy

Bending strength up to 400MPa, volume resistivity>10 ¹⁴Ω· cm

Typical applications: Integrated circuit substrate, oil drilling valve ball, chemical wear-resistant lining plate

Composite modified alumina

Strengthening and toughening through additives such as ZrO₂/MgO

Improved fracture toughness to 6MPa · m ¹/² or above

Specially designed for extreme working conditions such as armor protection and aerospace nozzles

From insulation components for 5G communication base stations to ceramic ball heads for artificial hip joints, alumina ceramics are constantly breaking through material performance boundaries. With the advancement of nanotechnology and sintering processes, this "industrial tooth" will demonstrate greater potential in emerging fields such as third-generation semiconductors and nuclear reactors.