Glazed Substrates
Features
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 | |
Related Information
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Product Information
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List of Characteristic Values (for Glazed Substrates)
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