Electronic Substrates
Electronic substrates are base supports for production of electronic circuits used in applications such as computer chips, multi-chip modules, circuit boards and disk drives. Ceramic substrates are often tape cast or roll compacted into a long thick or thin film flexible sheets. The sheets are cut to size and are then available for a variety of processing steps that may or may not include being punched, filled and laminated scribed and co-fired. Once fired, the substrate or package often receives further processing such as laser machining, lapping, polishing, etching or plating.
Alumina is used in these electronic substrates to improve mechanical, thermal and dielectric properties. Mechanical strength, hardness and overall integrity are improved when alumina is added to formulations, as are thermal and electrical properties such as expansion coefficient, conductivity, dielectric constant and resistivity.
Almatis offers unground and continuous ground calcined aluminas for thick, mid and thin film electronic substrates. We offer unground products for users that want to wet or dry process the alumina to achieve a desired particle size distribution and continuous ground products for users that prefer to blend rather than grind the components. Our aluminas also feature low impurity levels, specifically low Na2O contents, for improved processing and final substrate properties.
Unground Calcined Aluminas
Primary Crystal Size = 4.8µm
Specific Surface Area = 0.20 m2/g
Na2O Content = 0.08%
Safety Data Sheet
Product Data Sheet
Primary Crystal Size = 4.1µm
Specific Surface Area = 0.30 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 2.1µm
Specific Surface Area = 0.60 m2/g
Na2O Content = 0.03%
Primary Crystal Size = 1.8µm
Specific Surface Area = 0.70 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 1.7µm
Specific Surface Area = 0.90 m2/g
Na2O Content = 0.06%
Primary Crystal Size = 1.7µm
Specific Surface Area = 0.70 m2/g
Na2O Content = 0.12%
Technical PaperContinuous Ground Calcined Aluminas
Ground Median Size = 8.0µm
Ground Surface Area = 0.50 m²/g
Na2O Content = 0.08%
Ground Median Size = 3.2µm
Ground Surface Area = 0.80 m²/g
Na2O Content = 0.03%
Ground Median Size = 4.2µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.06%
Ground Median Size = 3.9µm
Ground Surface Area = 0.90 m²/g
Na2O Content = 0.06%
Batch Ground Reactive Aluminas
Ground Median Size = 0.4µm
Ground Surface Area = 8.8 m²/g
Na2O Content = 0.07%
Ground Median Size = 0.4µm
Ground Surface Area = 7.5 m²/g
Na2O Content = 0.08%
Ground Median Size = 3.1µm
Ground Surface Area = 1.1 m²/g
Na2O Content = 0.06%