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
				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	-
Dielectric Constant	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