Single Crystal Sapphire

Fully transparent, with highly uniform optical and mechanical properties

The chemical composition of single crystal sapphire is α-alumina, which is transparent, colorless, high hardness, small thermal expansion, acid and alkali corrosion resistance, and not easily corroded by chemical substances.

メリット

高い硬度と耐摩耗性
High light transmittance
Biocompatible
High resistance to most acids, bases and solvents
Low thermal expansion coefficient (8×10⁻⁶/K)
High electrical insulation

アプリケーション

Lenses, windows, prisms, laser cavity windows
Watch mirrors, mobile phone protective covers
Semiconductor substrates and bases
Ultra-high vacuum components
Precision mechanical components
Light guide display windows
Medical endoscope windows, ultrasound probe protection windows
Fluid Control Water Valve Disc

Single Crystal Sapphire Properties

Mechanical properties

プロパティ	単位	Sapphire
密度	g/cm³	3.98
Vickers hardness	HV	2000
曲げ強度	MPa	400
Compressive strength	MPa	2000
Elastic modulus	GPa	370
Toughness	MPa·m¹/²	3.5
ポアソン比	-	0.23
ヤング率	GPa	370

熱特性

プロパティ	単位	Sapphire
熱伝導率	W/mK	46
融点	°C	2050
最高使用温度	°C	2000
Linear expansion coefficient	10-⁶/K	8

熱膨張

プロパティ	単位	Sapphire
Dielectric constant	1 MHz	9.3
Breakdown voltage	V/cm	30
Dielectric loss	1 MHz	≤10⁻⁴
抵抗率	Ω・cm	≥10¹⁶

Note: This value is for reference only and may vary slightly depending on the batch conditions.

Single Crystal Sapphire Machining Manufacturer

Jundro Ceramics is a professional ultra-hard materials machining manufacturer and factory, which can achieve high-precision machining of Single Crystal Sapphire, support special-shaped, curved, lightweight, micro-pores (φ0.1mm) to achieve ultra-high finish of Ra0.002um. If you have a related project that requires ultra-hard materials machining in the near future, please let us share some of the work for you! Experience our advantages for yourself: one-to-one engineering support, single point of contact, highly competitive prices, on-time delivery and quality control

よくある質問

Is single crystal sapphire blue?

Industrial-grade single-crystal sapphire is usually colorless and transparent (pure α-Al₂O₃), and its name "sapphire" comes from the material composition (the same as natural sapphire).

The blue color of natural sapphire comes from titanium/iron impurities, while industrial synthesis can control impurities to achieve colorless, blue or other colors (such as for jewelry).

Note: In high-end applications such as optical windows and semiconductor substrates, colorless and transparent are necessary characteristics.

Single crystal sapphire is so hard, why does it break?

High hardness ≠ high toughness!
Although single crystal sapphire has high hardness, its fracture toughness is low (about 2.5 MPa·m¹/²), and cracks are prone to propagation when subjected to local impact.

Can sapphire be processed with microstructures, such as drilling and grooving?

Yes. Through CNC precision machining, high-precision hole machining (minimum hole diameter can reach φ0.1mm), chamfering, grooving and other complex structures can be achieved, which are suitable for sensor windows, valve plates and special-shaped optical components.

Is sapphire material suitable for high temperature environment?

Applicable. Sapphire has a melting point of up to 2040°C and has excellent stability at high temperatures, does not deform or delaminate, and can be used in thermal environments ≥1000°C for a long time, such as infrared detection windows, high-temperature observation windows, vacuum furnace windows, etc.