Materials

Alumina (Al₂O₃)

What is Alumina?

Alumina, also known as Aluminum Oxide or simply Al₂O₃, is a chemically stable, high-hardness, heat-resistant ceramic. As it is one of the most versatile fine ceramic materials, alumina is widely used in the electronics industry. Kyocera offers a range of alumina formulations for microelectronic packaging applications and can recommend tailored options to meet various customer requirements.

Features

Material Properties
- High flexural strength
- High thermal conductivity
- Coefficient of thermal expansion closer to Si
- Low dust generation
Design Flexibility
- Multi-layer structure
- Thin-film process options on polished surface
- Metal bonding (brazing)
Hermetic Sealing Options

Typical Applications

Ceramic Packages / Lids for Quartz Crystal Devices

Ceramic Packages for Image Sensors

Ceramic Packages, Submounts, and Lids for Optical Communications

Ceramic Packages for Light Emitting / Sensing Devices

Product Categories

Material Properties

Material Name			A440	A443	A473	AO610W	AO700	AO800	A476
Color			Black purple	Black	White	Light pink	Gray	Gray	White
Laminating Structure			Applicable	Applicable	Applicable	Applicable	Applicable	Applicable	Not applicable
Dissimilar Material Bonding			Applicable	Applicable	Applicable	Applicable	Applicable	Applicable	Not applicable
Characteristics			General-Purpose	Higher flexural strength	Lower Transmission Loss	Lower Conductor Resistance	Higher flexural strength		Higher Reflectivity / Flatness
Applications			General-Purpose	Smaller surface mount devices	High-frequency devices or optical communication devices	Higher heat- generating devices (light sources/optical communication)	Smaller quartz crystals		RF / optical communication
Electrical Characteristics	Dielectric Constant	1MHz	9.8	9.6	9.1	9.2	9.4	9.4	9.4
	Dielectric Constant	2GHz	-	-	8.5	9.0	9.2	9.4	-
	Dielectric Loss Tangent (x1.0E-4)	1MHz	24	5	5	9	6	4	4
	Dielectric Loss Tangent (x1.0E-4)	2GHz	-	-	10	11	6	13	-
Thermal Characteristics	CTE	(ppm/K) (RT~400℃)	7.1	6.9	6.9	6.9	7.2	7.5	7.2
Thermal Characteristics	Thermal Conductivity	(ppm/K) (W/(m･K))	14	18	18	17	21	16	24
Mechanical Characteristics	Flexural Strength	(MPa)	400	460	400	460	620	740	350
Mechanical Characteristics	Young's Modulus of Elasticity	(GPa)	310	310	270	281	315	300	320
Co-Fired Conductor Material			W,Mo	W,Mo	W,Mo	CuW,Mo	Mo	CuW,Mo	ー

* The above material properties are representative values. These values are subject to change due to improvements or changes in materials or processes.