Black Aluminum Oxide is a ceramic material known for its enhanced mechanical properties and unique appearance. This change in composition significantly improves its wear resistance, thermal conductivity and electrical properties.
Properties of Black Alumina Ceramic
Compared with traditional white alumina, black alumina ceramic has the following significant performance advantages:
- Highly wear-resistant
- Efficient heat conduction
- Higher strength and better toughness
- Acid and alkali corrosion resistance
- Aesthetics and surface finish
- Low expansion coefficient
Material Properties Comparison
Property | Black Alumina Ceramic | White Alumina Ceramic |
Color | Black | White |
Density (g/cm³) | 3.60 – 3.80 | 3.60 – 3.95 |
Hardness (Vickers HV) | 1200 – 2000 | 1500 – 2100 |
Compressive Strength (MPa) | 1500 – 2500 | 2000 – 2500 |
Flexural Strength (MPa) | 200 – 300 | 250 – 300 |
Young’s Modulus (GPa) | 300 – 380 | 350 – 380 |
Thermal Conductivity (W/m·K) | 20 – 30 | 25 – 35 |
Electrical Resistivity (Ω·cm) | 10¹⁴ – 10¹⁶ | 10¹⁴ – 10¹⁶ |
Max Service Temperature (°C) | 1650 | 1750 |
Porosity (%) | 0 – 1 | 0 – 1 |
Thermal Expansion (10⁻⁶/°C) | 7.5 – 8.0 | 8.0 – 9.0 |
Applications | Wear-resistant, electrical insulators, aerospace | Structural components, electrical insulators, industrial machinery |
Black Aluminum Oxide Application
Aerospace and Defense
Black alumina’s exceptional strength-to-weight ratio and high-temperature resistance make it a key material in aerospace applications. Components such as nozzles, insulators, and heat shields benefit from the material’s durability and thermal stability. Furthermore, black alumina’s ability to resist thermal expansion makes it ideal for high-precision aerospace components.
Automotive Industry
In the automotive industry, black alumina is used in the manufacture of engine components, brake pads, and wear-resistant parts. The material’s superior wear resistance allows these components to withstand the extreme pressures and temperatures typically encountered in automotive systems. Black alumina is also used in electronic systems for its insulating properties.
Semiconductor and Electronics
Due to its excellent electrical insulating properties and thermal conductivity, black alumina is widely used in the semiconductor industry. It is used in components such as substrates, heat sinks, and insulators. The material’s ability to handle high temperatures and electrical loads without degradation makes it critical for high-performance electronics.
Medical Devices
In medical applications, black alumina is often used for implants and prosthetics. Its biocompatibility, wear resistance, and ability to handle stress make it an ideal choice for components that require long-lasting performance in the human body.
Industrial Wear Parts
Due to its hardness and wear resistance, black alumina is commonly used in industrial applications such as valves, seals, and bearings. Its resistance to abrasion and corrosion ensures long-lasting performance in machinery that operates in demanding environments.
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