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Features

  • Available for Alumina- and Sapphire- integrated Complex Shaped Products
  • Maintains Superior Ceramic Properties like heat resistance, chemical resistance and plasma resistance without adhesives
  • Monolithic Structure ensures High Hermeticity and Mechanical Strength at the bonded boundary

Case 1

Transparent parts with Exceptional Resistance against Plasma and Chemicals
(Sapphire Monolithic Bonding)

The adhesive-free Sapphire monolithic bonding maintains superior sapphire properties such as plasma resistance, chemical resistance, heat resistance and mechanical strength even under a severe environment with plasma or exposed chemicals. In addition, it can be used where transparency is required, as the bonding boundary is not visible.

Design
Samples

  • Plasma Generating Tube

    Plasma Generating Tube (Size: Φ100mm)
  • Flow Cells

    Flow Cells (Size: 30×25mm)
  • Side

    Side
  • A-A'

    A-A' Bonding
    Area

Chemical Resistance of Sapphire

Compared to Quartz and Alumina, Sapphire has superior chemical resistance.

 
Chemical Resistance of Sapphire
 

Amount of reduction when immersed in each chemical

Amount of reduction when immersed in each chemical
Measurement conditions

1 x 1 x 0.02 (inches)
Sapphire piece immersed for 6 days

HCl :35% 20℃
HNO3 :50% 20℃
HF :46% 60℃
HF/HNO3 :40/10% 60℃
H3PO4 :60% 100℃
H2SO4 :95% 95℃
NaOH :30% 100℃

Plasma Resistance of Sapphire

High durability under both fluorine-based gas and chlorine-based gas plasma environment. *Measured on polished surfaces

 

Etching amount in fluorine-based gas (SF6) plasma environment

Etching amount in fluorine-based gas (SF6) plasma environment
Measurement conditions
Apparatus Magnetron type RIE Equipment
Pressure 25mTorr
Gas flow rate 50sccm
RF output 600W
Magnetic force 150gauss
Vdc 210V
Time 1 hour
 

Etching amount in chlorine-based gas (Cl2) plasma environment

Etching amount in chlorine-based gas (Cl2) plasma environment
Measurement conditions
Apparatus Magnetron type RIE Equipment
Pressure 25mTorr
Gas flow rate 50sccm
RF output 600W
Magnetic force 150gauss
Vdc 270V
Time 1 hour

Light Transmission Characteristics of Sapphire

Sapphire has consistent transmittance over a wide wavelength range.

 
Light Transmission Characteristics of Sapphire

Case 2

Sapphire and Alumina bonded bodies form highly hermetic seals

Sapphire and Alumina have high bonding strength and can be used where hermeticity is required. In addition, since no adhesive is used, the generation of impurities and particles is reduced around the bonded area. It is possible to use Sapphire and Alumina bonded parts, instead of all Sapphire parts, where transparency is required. Sapphire portion can be applied where transparency is required.

Bonded Body Sample

  • Bonded body Sample

    Measuring Window in Biochemical Analyzer

    Bonded body Sample

Hermeticity

  • Achieve high vacuum requirement of 10-9 Pa・m3/s or less by helium leak test
  • Ensure high hermeticity and mechanical strength by integrated bonding boundary

SEM Image
(×100)

SEM image (×100)
SEM image (×100) SEM image (×100)

Values are based on typical material properties and
may vary according to product configuration and manufacturing process.