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Why Choose Alumina (Al2O3) Ceramics for Your Equipment Components?

  Choosing the Right Purity Level for Your Alumina Ceramics
Alumina ceramics (Al2O3), also known as corundum, is one of the most widely used  ceramic materials in the industrial sector. Renowned for its exceptional hardness,
high-temperature resistance,and electrical insulation properties, alumina ceramics also boasts excellent thermal conductivity, chemical resistance, and wear resistance,
coupled with an extremely low thermal expansion coefficient.These properties make it ideal for use in military, aerospace, semiconductor manufacturing, energy,
chemical industries, and various equipment components that operate under harsh conditions.

Choosing the Right Purity Level for Your Alumina Ceramics יִשְׂרָאֵל

The purity of alumina ceramics varies and should be selected based on specific application needs. The most common purity levels are 95%, 99%, and 99.7%, with higher purity correlating to
enhanced performance.

Below is a comparison of the mechanical, thermal, and electrical properties of alumina ceramics at different purity levels:

Mechanical Properties

Material 95% Al2O3 99% Al2O3 99.7% Al2O3 ZTA
Colour White Pale Yellow Light Yellow White
Density 3.72 g/cm³ 3.9 g/cm³ 3.92g/cm³ 4.3g/cm³
Hardness  Mohs 9 9 9 14.4
Tensile Modulus 320 GPa 360 GPa 390 GPa
Poisson's Ratio 0.22 0.23 0.23 0.23
Flexural Strength 300 MPa 350 MPa 380 MPa 600 Mpa
Compressive Strength (25℃) 2400 MPa 2500 MPa 2500 MPa 2500Mpa
Fracture Toughness 4.00 MPa`m½ 4.00 MPa`m½ 5.40 MPa`m½ 4.80 MPa-m½
Weibull Modulus 7-8 9-10 9-10


Thermal Properties

Material 95% Al2O3 99% Al2O3 99.7% Al2O3 ZTA
Specific Heat Capacity 0.880 J/g`°C 0.880 J/g-°C 0.900 J/g-°C 0.800 J/g-°C
Thermal Conductivity 25.0 W/m`K 26.5 W/m-K 30W/m-K 28W/m K
CTE, linear (20.0-400°C) 7.50 µm/m`°C 7.5 µm/m`°C 7.50 μm/m`°C 7.50 μm/m`°C
CTE, linear (20.0-1000°C) 8.1 µm/m`°C 8.20µm/m`°C 8.50 μm/m`°C 8.20µm/m`°C
Max. Service Temp. Air 1450°C 1550℃ 1600 1650 °C


Electrical Properties

Material 95% Al2O3 99% Al2O3 99.7% Al2O3 ZTA
Volume Resistivity (400°C) >= 1.00×10^12 ohm`cm 1.00×10¹⁴ ohm`cm 1.00×10¹⁴ ohm`cm 7.78 × 10^9 ohm-cm
Dielectric Constant (1e+6 Hz) 9.5 9.6 10 12.2
Dielectric Strength 10-20 kV/mm 20-25 kV/mm 30.0-43 KV/mm 50 V/mm
Dielectric Loss Index (9.00e+9 Hz 0.0010) 0.001 0.001 0.001 0.001

Note: The data presented is based on laboratory conditions and may vary in real-world applications. It is for reference only.

Applications of Alumina Ceramics

Choosing the Right Purity Level for Your Alumina Ceramics

  • DM_20241024140334_003.JPEG

    Ceramic Thermocouple Tube

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    Ceramic Classification Wheel

  • DM_20241024140334_005.JPEG

    Large Size Alumina Plate(Maximum size available: up to 3 meters，No mold cost required）

  • DM_20241024140334_006.JPEG

    ZTA Refractory Brick

  • DM_20241024140334_007.JPEG

    Ceramic Shaft

  • DM_20241024140334_008.JPEG

    Alumina ceramic parts for oil extraction equipment

How is Alumina Ceramic Manufactured?

The Alumina Ceramic Manufacturing Process involves several key stages:
1  Powder Preparation: Ensures the finest quality material for ceramic production.
2  Forming Methods (Green Body): Techniques include dry pressing, injection molding, tape casting, hot pressing, and isostatic pressing.
3 Sintering Techniques:
            *Conventional high-temperature furnace sintering
            *Hot isostatic pressing (HIP)
            *Microwave sintering
4 Machining:
             *CNC machining
             *Grinding
             *Cutting
5 Surface Treatment: Various finishing methods depending on the final application.
6 Quality Inspection: Advanced tools like coordinate measuring machines (CMM) and image measurement instruments ensure high standards.


Alumina  Company
Founded in 2016,WEIERT Ceramics is an advanced manufacturer of technical ceramics, not a trading intermediary. We offer both standard and custom-engineered ceramics, including crucibles, and pre-fabricated
ceramic tubes and plates. Our capabilities include producing ceramic plates up to 1.6 x 0.53m and tubes with diameters less than 80mm, designed for secondary processing to meet specific customer needs.
Our commitment is to provide the most competitive pricing and service through innovation in technology and management.
Choosing the Right Purity Level for Your Alumina Ceramics

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