What are the characteristics of black alumina ceramics

Black alumina ceramics are precision ceramic materials primarily made of alumina (Al₂O₃), by adding transition metal oxides as colorants and combining them with sintering additives, and sintering at a specific temperature.

Black alumina ceramics have high light-shielding performance, which enable them absorb all wavelengths of light within the visible light range. The ability to effectively suppress the reflection and scattering of light, make its superior optical performance to satisfy the semiconductor integrated circuit, optical devices and similar strict requirements in the field of high precision. In its typical application in the photolithography process, it can reduce stray light interference and improve pattern precision.

In the electrical and thermal performance, black alumina ceramics showed excellent electrical insulation, the resistivity can be more than 10 ⁸ Ω · cm. They further exhibit remarkable thermal stability, enabling the preservation of consistent performance even amid high-temperature surroundings. Thanks to these combined traits, they can operate reliably under high-temperature and high-voltage conditions, making them widely utilized in high-frequency circuits and the packaging of power devices.

Durability is another key advantage of black alumina ceramic products. This is rooted in their high strength, high hardness, and strong wear resistance—qualities that let them withstand mechanical stress in complex working scenarios.

Black alumina ceramics boast outstanding chemical stability, is resistant to acid and alkali corrosion, and has anti-oxidation properties. Therefore, they are suitable for electronic devices that are constantly exposed to harsh environments, especially outdoors or in high-humidity conditions.

Moreover, the density of black alumina ceramics is lower than that of packaging materials constructed from metal. They are lightweight and have better air tightness than plastic packaging, combining the advantages of lightweight and high reliability. They are suitable for military, aerospace and other fields with strict requirements for volume and sealing performance.

Black alumina, thanks to its unique light-blocking property, durability, electrical insulation, low density, high air tightness and chemical stability, has become a key material in high-end fields such as semiconductors, optics and aerospace, especially irreplaceable in scenarios that are sensitive to light or have high reliability requirements.

Semicorex provides high-quality black alumina ceramic products, such as Al2O3 vacuum chucks, If you have any inquiries or need additional details, please touch with us.