Aluminum Oxide, Alumina (Al2O3) at Best Price

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Ceramic Material Comparison Chart

Explore our interactive ceramic material comparison chart below, designed to help you easily compare different materials based on their key properties, and find the best fit for your application.

Aluminum Oxide, Alumina (Al2O3)

Alumina, or aluminum oxide (Al2O3), is a foundational element in the realm of technical ceramics, with a high melting point of 2,072℃. This makes it the most prevalent ceramic material used across industries, renowned for its role as a traditional yet essential material. The high-purity aluminum oxide version of alumina finds extensive applications in a variety of sectors, credited to its comprehensive utility and adaptability. Its widespread use in technology and industry is attributed to alumina's exceptional properties, including superb electrical insulation, high thermal conductivity, and strong chemical resistance, which collectively make it a versatile and indispensable material.

Moreover, the characteristics of alumina such as good wear resistance and low thermal expansion further enhance its suitability for diverse applications, ensuring components made from alumina can endure extreme conditions and mechanical stress. This positions alumina as a critical resource in applications demanding high durability and reliability. From its insulating properties crucial in electronics to its wear resistance vital in mechanical systems, and thermal conductivity essential for thermal management, alumina's multifaceted performance solidifies its standing as a key material in pushing the boundaries of modern industry and technological innovation.

We offer alumina products in four purity grades: 95%, 99%, 99.5%, and 99.7%. Use the table below to compare their properties, or browse our product list to find the right part for your application.

More Info About Alumina

Products

Aluminum Oxide Specifications

Material		Alumina
Properties	Units	AL997	AL995	AL99	AL95
%Alumina	-	99.70%	99.50%	99.00%	95.00%
Color	-	Ivory	Ivory	Ivory	Ivory & White
Permeability	-	Gas-tight	Gas-tight	Gas-tight	Gas-tight
Density	g/cm3	3.94	3.9	3.8	3.75
Straightness	-	1‰	1‰	1‰	1‰
Hardness	Mohs Scale	9	9	9	8.8
Water Absorption	-	≤0.2	≤0.2	≤0.2	≤0.2
Flexural Strength（Typical 20℃）	Mpa	375	370	340	304
Compressive Strength （Typical 20℃）	Mpa	2300	2300	2210	1910
Coefficient of Thermal Expansion (25℃ to 800℃）	0-6/℃	7.6	7.6	7.6	7.6
Dielectric Strength （5mm Thickness)	AC-kv/mm	10	10	10	10
Dielectric Loss 25ºC@ 1MHz	-	< 0.0001	< 0.0001	0.0006	0.0004
Dielectric Constant	25º C@ 1MHz	9.8	9.7	9.5	9.2
Volume Resistivity (20℃）（300℃）	Ω·cm³	>10¹⁴ 2*10¹²	>10¹⁴ 2*10¹²	>10¹⁴ 4*10¹¹	>10¹⁴ 2*10¹¹
Long-term Operating Temperature	℃	1700	1650	1600	1400
Thermal Conductivity (25℃）	W/m·K	35	35	34	20

Aluminum Oxide Formulations

ACM's product formulations are developed to address the varied application problems in which ceramic components are commonly used. Many industrial applications push the envelope on specific requirements, leading to the development of new formulations to successfully address them.

Properties

Unit

Fused Alumina

Reactive Grade Alumina

Ready To Press Alumina (RTP Alumina)

Activated Alumina

Al₂O₃Content

95.5

99.8

Bulk Density

g/cm³

3.95

~600

~1000

~600

~1100

~900

~1200

~1100

–

Grain Size

μm

Customized

≈130

≈170

≈100

≈200

customized

Color

–

White

Melting Point

℃

2000

–

Hardness

Mohs

–

Specific Surface Area

m²/g

–

0.2-0.5

3.5-5

2-3

6-9

6-10

–

200-260

Corundum vs. Alumina vs. Cordierite vs. Mullite

Aluminum Oxide Applications in Various Industries

1. Industrial Appliances
Alumina ceramics are critical in the manufacturing of components for industrial appliances due to their high thermal stability and resistance to wear and corrosion. This includes use in furnaces and as thermal couple protectors, where their ability to withstand extreme temperatures is essential.

2. Coatings
High-purity alumina provides excellent protective coatings for various applications, offering resistance to abrasion, corrosion, and thermal shock. These coatings are particularly valuable in extending the life and performance of equipment in harsh environments.

3. Labware
Alumina's chemical inertness and high melting point make it suitable for labware, such as crucibles and mortars and pestles, used for grinding and heating chemical compounds in laboratories.

4. Engineered Ceramics
Engineered alumina ceramics serve in advanced applications, including CVD processes, ion implants, photolithography, and semiconductor manufacturing, where parts require high purity and precision.

5. Refractories
Alumina's high melting point and resistance to thermal shock make it an ideal material for refractories used in the lining of furnaces, kilns, and reactors in various industrial sectors.

6. Artificial Bones and Joints
Due to its excellent biocompatibility, high strength, and wear resistance, alumina ceramics are used in medical applications to manufacture artificial bones and joints, enhancing the quality of life for patients.

7. Abrasives
The extreme hardness of alumina ceramics makes them perfect for abrasive applications, including grinding media and abrasive tools, where they outperform metals in durability and efficiency.

8. Consumer Electronics
Alumina's electrical insulation properties and thermal management capabilities are leveraged in consumer electronics, providing critical components such as insulators, substrates, and enclosures.

9. Traditional Industry Applications
In traditional industries, alumina ceramics are utilized in products like injector tubes, gas nozzles, and insulators, benefiting from their hardness and thermal resistance.

10. Grinding and Polishing Tools
Alumina's hardness and durability also make it the material of choice for grinding and polishing tools, including mortars and pestles widely used in laboratory settings for preparing samples.

Alumina ceramics stand out for their versatility across a broad spectrum of applications, from high-tech engineering and semiconductor manufacturing to traditional industries and medical prosthetics. Their unique combination of thermal stability, mechanical strength, and chemical inertness allows alumina products to meet the demanding requirements of various fields, driving innovation and enhancing performance in countless applications.

ACM Ceramic Product Categories

Your Aluminum Oxide Ceramics Supplier

Advanced Ceramic Materials (ACM) is a leading supplier of alumina ceramic products of the highest quality for various applications. We are happy to provide advice on materials, design, and application. Feel free to contact us with questions about Al2O3 or other ceramic materials not listed on the website.

FAQs

How Are Alumina Components Made?

Alumina components are typically manufactured through processes such as dry pressing, isostatic pressing, injection molding, slip casting, and extrusion. After forming, the parts are sintered at high temperatures (typically 1600-1800°C) to achieve full density and mechanical strength.

Do You Supply Customized Al2O3 Components?

We can supply customized products according to the drawings you provide, and our engineers can also provide technical support and advice for your design.

What Are the Characteristics of Aluminum Oxide?

Aluminum Oxide is characterized by high hardness, excellent resistance to corrosion, thermal stability, good dielectric properties (for converting from DC to GHz frequencies), low loss tangent, and stiffness. See the next section for more details on the properties of alumina ceramic materials.

What Are the Different Types of Aluminum Oxide Ceramic?

Depending on the content of Al2O3 and additives used, there are different series of aluminum oxide mateials. Based on the Al2O3 content, alumina can be categorized as 75% alumina, 85% alumina, 95% alumina, 99% alumina, and so on. Based on the difference in crystal phase, there are mullite, corundum-mullite, and corundum; Based on the variety of additives used, there is the chromium corundum, titanium corundum, etc.

What Are the Differences Between Zirconia Toughened Alumina (zta) and Alumina Toughened Zirconia (atz)?

While both ZTA and ATZ have the same raw materials, it is important not to confuse the two composites. In alumina toughened zirconia (ATZ), the ratio of alumina to zirconia is low. In zirconia toughened alumina (ZTA), the opposite is the case.

96% vs 99% Alumina — Which One Should I Choose?

96% alumina is suitable for most general industrial applications where cost is a consideration. 99% and above is recommended for semiconductor processing, high-voltage electronics, and medical implants where purity and reliability are critical.

How Does Alumina Compare to Other Ceramic Materials?

Alumina offers a superior combination of hardness, thermal stability, and chemical resistance compared to many other ceramic materials, making it more versatile and widely applicable in various industries.

Is Alumina Environmentally Friendly?

Alumina is inert and non-toxic, posing minimal environmental impact. Its durability and recyclability further contribute to its environmental friendliness in various applications.

Properties

Chemical Formula	Al2O3
Mechanical
Density	3.9 g/cm3
Hardness	17.2 GPa
Modulus of Elasticity	380 GPa
Flexural Strength	380 MPa
Compressive Strength	2450 MPa
Poisson's Ratio	0.23
Fracture Toughness	4 MPa m½
Electrical
Dielectric Strength	15 ac V/mm
Dielectric Constant	9.9 (@ 1 MHz)
Volume Resistivity	10^14 ohm-cm
Thermal
Coefficient of Thermal Expansion	7.2 x 10^-6/°C
Thermal Conductivity	37 W/(m*K)
Specific Heat	780 J/(Kg*K)
Shock Resistance	250 °C Diff.
Maximum Working Temperature	1700 °C