Alumina Ceramic 95-99.8%

Capable of precision machining of shaped, round and curved ceramic components

As a widely used industrial ceramic, its purity ranges from 90% to over 99.8%. It is a highly durable material. The higher the purity, the better the performance. It has high hardness, wear resistance and chemical resistance. It is suitable for semiconductors, medical, automation and other fields

Alumina Advantages

優れた生体適合性
Strong electrical insulation properties
High chemical corrosion resistance.
Superior high-temperature stability and thermal shock resistance
Mohs hardness up to 9, with high hardness and mechanical strength
Capable of withstanding large mechanical loads
Low thermal expansion coefficient and specific thermal conductivity rates
Excellent thermal conductivity and antioxidant performance
Wear and abrasion resistant
Transparent to microwave radio frequencies
High compressive and dielectric strength

Alumina Applications

Equipment lining
High voltage insulator
Artificial joints, dental implants
Igniter insulator
Valve seals, chemical pumps
High-temperature support structures
Laser optical components
Sealing rings in mechanical equipment
Electronic components & substrates
High-temperature electrical insulators
High voltage insulators
Laser tubes
Machine components
Mechanical seals
Precision shafts and axles in high wear environments
Roller and ball bearings
Seal rings
Semiconductor parts
Shot blast nozzles
Thermocouple tubes
Tap plates
Valve seats
Wear components

99.8%Alumina Material Properties

機械的特性

プロパティ	単位	アルミナ
密度	g/cm³	3.93
ビッカース硬度	GPa	18
曲げ強度	MPa	416
圧縮強度	MPa	2556
Water Absorption Rate	%	0
Alumina Content	%	99.8
ヤング率	GPa	358

Thermal Performance

プロパティ	単位	アルミナ
熱伝導率	W/mK	30.8
Thermal Shock Resistance Strength	J/m²·K	2700
最高使用温度	°C	1765

Electrical Characteristics

プロパティ	単位	アルミナ
Permittivity (1 MHz)	-	9.28
Electric Strength	KV/mm	14.7
体積抵抗率	Ω・cm	2.7×10¹⁴

注：この値は参考値であり、バッチ条件により多少異なる場合がある。

Machining Alumina

アルミナ is available in various purities, typically ranging from 90% to 99.9%, with Jundro Ceramics specializing in 99.8% purity material.
The material can be processed through several methods, including injection molding, die pressing, isostatic pressing, slip casting, and extrusionFurthermore, alumina can be effectively joined to metals or other ceramics using metalizing and brazing processes.

At Jundro Ceramics, we specialize in high-precision, complex machining. With our extensive in-house capabilities, including 4th and 5th axis machining centers, drilling, grinding, milling, polishing, sawing, tapping, threading, and turning, we ensure the highest quality alumina components that meet strict specifications.

5軸アルミナセラミック加工

Alumina Prototype Customization Case

We specialize in precision machining of Macor with complex shapes, and are able to achieve high-precision machining to meet the needs of various complex designs.

よくある質問

アルミナ（酸化アルミニウム）とは何ですか？

アルミナ（Al2O3）は、卓越した機械的、電気的、熱的特性を持つ高耐久性のテクニカルセラミックです。高い硬度（モース硬度は最大9）、耐摩耗性、耐薬品腐食性、優れた高温安定性を誇り、融点は2050℃を超える。アルミナはまた、電気絶縁性、生体適合性、低熱膨張性でもあり、電子機器、航空宇宙、医療機器などの産業での用途に適している。

アルミナの主な工業用途は？

アルミナは、その汎用性の高い特性により、様々な産業分野で広く使用されている。主な用途には、電子パッケージ基板、マイクロ波窓、高電圧絶縁体、バルブシール、ケミカルポンプ、半導体部品、熱電対チューブ、高温構造支持体、耐摩耗性部品、人工関節や歯冠などの医療用インプラントなどがある。

アルミナはどのように製造・加工されるのか？

Alumina is produced through different forming techniques, including injection molding, die pressing, isostatic pressing, slip casting, and extrusion. Following sintering, it is primarily machined using diamond grinding methods due to its hardness. Specialized techniques such as green and biscuit state machining allow for more complex geometries prior to sintering, while fully sintered alumina requires diamond-coated tools for precise final machining.

What are the different purity grades of Alumina and their respective uses?

Alumina is available in various purities, typically ranging from 90% to 99.9%. The highest-purity alumina (above 99.8%) is used in high-performance applications such as semiconductor devices, medical implants, and optical components. Lower-purity alumina (90-97%) is commonly used in industrial applications where wear resistance, electrical insulation, and corrosion resistance are required but not to the extreme precision of high-purity grades.

How is Alumina bonded to metals or other ceramics?

Alumina can be joined to metals or other ceramics using advanced techniques such as brazing, metalizing, or diffusion bonding. These methods allow for strong, reliable bonds that maintain the material’s integrity, particularly in high-temperature, high-stress environments such as in aerospace, electronics, and chemical processing equipment.

What are the machining challenges associated with Alumina and how are they addressed?

Alumina’s high hardness and toughness present challenges during machining. In its green or biscuit state, alumina is relatively easy to machine into complex shapes, but it undergoes approximately 20% shrinkage during sintering, making tight tolerances difficult to achieve. After sintering, precise machining requires the use of diamond-coated tools or grinding wheels to achieve tight tolerances, which can be a time-consuming and costly process due to the material’s inherent hardness.