Ceramics

Glazed Substrates

Glazed Substrates

Features


Glazed Substrates
The surface of Alumina substrates are glazed with alkali-free and lead-free amorphous glasses. They have excellent durability and surface smoothness. One of their uses is for thermal print heads.

Applications


Thermal print head, Thin film hybrid IC

Glaze Materials and Characteristic Values


Item/Unit Measurement Equipment Glaze Material and Substrate Types
GS-31 GS-32 GS-40 GS-62
HA-96-2 HA-96-2 HA-96-2 HA-96-2
Color - White White White White
Glass Transition Temperature (°C) TG-DTA 688±20 697±20 750±20 692±20
Yield Point (°C) TMA 757±20 763±20 861±20 746±20
Softening Point (°C) TG-DTA 969±20 875±20 935±20 -
Coefficient of Thermal Expansion ×10-7/K TMA 68±3 72±3 67±3 65±3
Thermal Conductive 30°C (W/mK) Laser Flash Thermal Constants Analyzer 1.05 0.88 0.80 0.93
300°C (W/mK) Laser Flash Thermal Constants Analyzer 1.13 1.10 1.06 -
600°C (W/mK) Laser Flash Thermal Constants Analyzer 1.51 1.76 1.47 -
Density (g/㎤) - 2.99 3.10 3.17 3.03
Dielectric Constant 1MHz - 8.6 - 9.3 -
1GHz - 8.4 - 9.0 -
Volume Resistivity 20°C (Ω・㎝) - >1014 >1014 >1014 -
300°C (Ω・㎝) - 1*>1014 1*>1014 1*>1014 -
500°C (Ω・㎝) - 1*>1010 1*>1010 1*>1010 -
Specific Heat (J/g°C) - 0.576 0.631 0.638 0.684
Features Alkali-Free Lead-Free Alkali-Free Lead-Free Alkali-Free Lead-Free Ultra Heat Resistance Alkali-Free Lead-Free
Use Partial Grazing Full Grazing Full Grazing Partial Grazing Full Grazing

Glaze Processing


Item/Unit Type
HA-96-2
As Fired (Ra ㎛) 0.2~0.5
Lapping (Ra ㎛) 0.3~1.0
Polishing (Ra ㎛) 0.05 or less
Tolerance after Grinding (㎜) ±0.05

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