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Alumina Ceramics

Alumina ceramics, also known as aluminum oxide ceramics, are among the most widely used advanced ceramic materials due to their outstanding combination of mechanical, thermal, and chemical properties. Composed primarily of Al₂O₃, these ceramics offer excellent hardness, wear resistance, and thermal stability, making them suitable for demanding applications across various industries. Their unique characteristics allow them to outperform many traditional materials under extreme conditions, such as high temperatures, corrosive environments, or abrasive processes. With their exceptional versatility, alumina ceramics have become an indispensable material in modern engineering and scientific research.

Main Features

Alumina ceramics possess a range of outstanding properties, which can be summarized as follows:

High Hardness and Wear Resistance: Exceptional mechanical strength and superior durability under abrasive and high-stress conditions.
Outstanding Thermal Stability: Capable of withstanding temperatures above 1000 °C without losing structural integrity.
Low Thermal Expansion & High Thermal Conductivity: Ensures excellent dimensional stability and efficient heat dissipation.
Excellent Chemical Resistance: Inert to most acids, alkalis, and organic solvents, making it ideal for harsh environments.
Superior Electrical Insulation: High dielectric strength and low dielectric loss support reliable performance in electronic applications.
Good Corrosion Resistance: Maintains stability and integrity in corrosive environments.
Biocompatibility: Safe and effective for medical implants, prosthetic components, and surgical instruments.

Product Specifications

We mainly offer three series of alumina ceramics. The specific specifications of these ceramics are as follows:

Catalog Number	ALCM-AC-01	ALCM-AC-02	ALCM-AC-03
Material	Al₂O₃ > 99.7%	Al₂O₃ > 99%	Al₂O₃ > 95%
Color	White, Ivory	Ivory	White
Density	3.9 g/cm³	3.78 g/cm³	3.65 g/cm³
Flexural Strength	390 MPa	368 MPa	300 MPa
Compressive Strength	3900 MPa	3000 MPa	3400 MPa
Elastic Modulus	390 GPa	350 GPa	350 GPa
Impact Strength	5.2 MPa m^1/2	4.6 MPa m^1/2	4 MPa m^1/2
Weibull Modulus	12 m	10 m	10 m
Vickers Hardness	2000 (HV 0.5)	2000 (HV 0.5)	1800 (HV 0.5)
Coefficient of Thermal Expansion	5.5-8.4 × 10^-6K^-1	5.1-8.3 × 10^-6K^-1	5.0-8.3 × 10^-6K^-1
Thermal Conductivity	28 W/mK	25 W/mK	24 W/mK
Thermal Shock Resistance	280 △T°C	250 △T°C	250 △T°C
Maximum Operating Temperature	1700 °C	1600 °C	1500 °C
Volume Resistivity at 20 °C	>10¹⁵ Ω·cm	>10¹⁴ Ω·cm	>10¹⁴ Ω·cm
Dielectric Strength	30 kV/mm	30 kV/mm	20 kV/mm
Dielectric Constant	10 εr	10 εr	10 εr
Dielectric Loss Angle (1MHz, 20 °C)	0.0005 tanδ	0.0005 tanδ	0.0001 tanδ

These properties are measured on test samples. Due to different manufacturing processes and product forms, the actual properties of ceramics may vary.

Typical Applications

Due to their superior properties, alumina ceramics are widely used in industries such as electronics, aerospace, metallurgy, medical technology, and automotive engineering. In the electronics sector, they serve as substrates for circuit boards, insulators, and sensor housings. In the medical field, their biocompatibility allows for applications such as prosthetic components, surgical tools, and dental implants. In heavy industries, alumina ceramics are used in cutting tools, wear-resistant nozzles, bearings, and seals, significantly extending the service life of critical components.

With rich experience in the field of advanced ceramic materials, Alfa Chemistry is capable of providing customers with high-quality alumina ceramics. These products can meet the diverse industrial and research needs of customers. If you are interested in our products, please feel free to contact us to learn more.

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