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알루미나 세라믹(Al2O3)

알루미나 세라믹(Al2O3)

Alumina Ceramics (Al₂O₃) and corundum.
Alumina ceramics (Al₂O₃),  are a key member of advanced ceramics family, made from high-purity synthetic alumina powder. The process involves molding the powder into green bodies with pressure-forming equipment, followed by high-temperature sintering. For high-precision components, CNC machining is often used before or after sintering.
With the rise of 3D printing, alumina photopolymerization has become an important shaping method as well.
Alumina ceramics come in various forms based on crystal structure, mainly including α-Al₂O₃, β-Al₂O₃, and γ-Al₂O₃. After high-temperature sintering (typically over 1200°C), all structures transform into α-Al₂O₃, also called corundum.
The most commonly used alumina ceramics contain 90% or more Al₂O₃, with varieties such as 95%, 99%, 99.7%, and 99.99% purity. Alumina with 99.99% purity is often semi-transparent or transparent, known as sapphire.

Key Properties of Alumina Ceramics 장점:
High Melting Point
High Hardness
Chemical Corrosion Resistance
Outstanding Dielectric Properties
Superior Optical Properties (for 99.99% Transparent Alumina)

Disadvantages:
Low toughness, relatively brittle.

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일반

속성 단위 95%Al2O3 99%Al2O3 99.8%Al2O3 99.99%Al2O3
색상 흰색 Ivory Ivory Icy/Off White
밀도 g/cm³ 3.72g/cm³ 3.9g/cm³ 3.92 g/cm³ 3.98 g/cm³
수분 흡수 % 0 0 0 0
가스 투과성 ATMS-CC/SEC 기밀 <10-¹º 기밀 <10-¹º 기밀 <10-¹º 기밀 <10-¹º
Optical Transmission μm 0.3 ~ 5
Reflection Loss dB 0.2

 

기계적 특성

속성 단위 95%Al2O3 99%Al2O3 99.8%Al2O3 99.99%Al2O3
비커스 경도(500g) GPa (kg/mm2 ) 11.5 (1175) 12.7 (1300) 15（1530） 19.6（2000）
로크웰 경도 R45N 79 81 86 91
25°C에서 압축 강도 MPa(psi x 103) 1827 (265) 2241 (325) 2240 (325) 2413 (350)
굴곡 강도(MOR)
(3점) @ 25°C		 MPa(psi x 103) 310 (45) 393 (57) 379 (55) 455 (66)
골절 인성(노치 빔) MPam1/2 3-4 4-5 3-4 5-6
탄성 계수 GPa(psi x 106) 303 (44) 345 (50) 379 (55) 393 (57)
포이즌 비율 0.22 0.23 0.23 0.23
인장 계수 @ 25°C MPa(psi x 103) 151 (22) 221 (32) 200 (29) 275 (40)

 

열 속성

속성 단위 95%Al2O3 99%Al2O3 99.7%Al2O3 99.99%Al2O3
25°C에서의 열 전도성 W/m-K 20 30 30 35
비열 용량 J/g-°C 0.88 0.88 0.90
C.T.E. 25 - 100°C x 10-6/C 6.1 6.2 6.5 6.5
C.T.E. 25°-300°C x 10-6/C 7.0 6.8 7.8 7.8
C.T.E. 25°-600°C x 10-6/C 7.7 7.6 8.0 8.1
Max.Service Temp.Air/불활성 화씨(°F) 3000 3000 3000 3000
섭씨(°C) 1650 1650 1650 1650

 

전기적 특성

속성 단위 95%Al2O3 99%Al2O3 99.7%Al2O3 99.99%Al2O3
유전체 상수 @ 1MHz 9.2 9.5 10
유전체 상수 @ 기가헤르츠 11 9.8 9.6
유전체 손실 @ 1MHz 0.0009 0.0005  < .0001
유전체 손실 @ 기가헤르츠 12.5 9.8 9.6
유전체 강도(.125" 두께) V/mil 250 260 290 430
체적 저항률 @ 25°C ohms-cm > 1 x 10¹⁴ > 1 x 10¹⁴ > 1 x 10¹⁴ > 1 x 10¹⁴
체적 저항률 @ 300°C ohms-cm 5 x 10¹² 8 x 10¹¹ 3 x 10¹² 1 x 10¹³
체적 저항률 @ 500°C ohms-cm 3 x 10⁹ 2 x 10⁹ 6 x 10¹º 5 x 10¹²
700°C에서의 체적 저항 ohms-cm 3 x 10⁸ 2 x 10⁸ 6 x 10⁹ 1 x 10¹²

*The values represent typical material properties and may vary depending on product configuration and the manufacturing process. For further information, do not hesitate to 문의하기.

Applications of Alumina Ceramics

Alumina ceramics are widely used across a range of industrial and biomedical fields, including but not limited to:

  • Vacuum Electronic Devices
  • Thick and Thin Film Circuit Substrates
  • Spark Plug Insulators
  • Textile Ceramic Components
  • Abrasives, Grinding Tools, and Ceramic Cutting Tools
  • High-Temperature Structural Parts
  • Sapphire (99.99% Al₂O₃) can be used for periscopes, scopes, and measurement instrument lenses.

 

Alumina Ceramic Material Grades-4 Purity Levels


95% Alumina （A12O3）

99% Alumina （A12O3）

99.7% Alumina （A12O3）

99.99% Alumina ( A12O3)

 

CNC-machining Alumina ceramics
Yixing WEIERT Ceramics Technology Co., Ltd. is a leading manufacturer and exporter of alumina ceramics. With a dedicated research and development (R&D) department for ceramic materials, we continuously innovate and enhance material performance to meet the diverse needs of our customers. Unlike trading intermediaries, we are a direct manufacturer with full in-house capabilities, allowing us to control the entire technical ceramic production process—from raw material production and sintering to CNC machining. Since 2016, we have produced over 5,000 types of precision ceramic products for hundreds of companies.

Alumina ceramic production process diagram, including Al2O3 powder preparation, dry pressing, sintering process, and CNC machining.

Custom Alumina Oxide Ceramic Component Services：

Alumina ceramic tubes
CNC-machining Alumina ceramics
Precision Alumina ceramics
Custom Alumina ceramic parts
Large Alumina plates （High Purity Alumina）
Large Alumina Components
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