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Information @ a Glance

General
  • Aluminium Oxide (Al2O3 ) or alumina is one of the most versatile of refractory ceramic oxides and finds use in a wide range of applications.

  • It is found in nature as corundum in emery, topaz, amethyst, and emerald and as the precious gemstones ruby and sapphire, but it is from the more abundant ores such as bauxite, cryolite and clays that the material is commercially extracted and purified.

Production Process

  • The most common process for the extraction and purification of alumina is the ‘Bayer’ process. The yield of alumina from these processes can approach 90%.
  • Through a series of chemical baths, ground aluminum substrates are plated with a nickel phosphorus ("NiP") layer in order to provide support for the magnetic layer.
  • A modified Ziegler alcohol process produces high purity gels, derived from aluminum metal. This manufacturing process for these products begins with primary aluminum to produce an alumina of extraordinary purity.

Applications

  • This high grade alumina substrate is applied for thin film integrated circuit in high frequency waves, capacitor or resistor and for sensors.
  • Alumina is used as milling media in a wide range of particle size reduction processes.
  • IRC has developed an aluminum alloy substrate for surface mounted LEDs using an aluminum core with a chemically grown dielectric layer and printed conductor tracks. This technique produces an insulated, yet thermally conductive PC board with extremely low thermal resistance from the die or chip to the substrate in power LED applications.

Technology

  • EMC Technology introduces an entire line of new surface mount (SMT) alumina chip terminations made with the telecom market in mind. These terminations can be used in applications from DC to 3 GHz and are ideal for Cellular, GSM, PCS, and UMTS applications.
  • Application of alumina ceramics can be greatly enhanced and fabrication costs reduced if simple and reliable joining techniques are developed.

Report

  • The sensor is fabricated by screen printing three distinct materials on an alumina substrate.
  • It is reported that diffusion resistance in the Vycor layer can be reduced by depositing a thin Vycor layer (10-20 pm thick) onto a macroporous alumina support tube, followed by sequential CVD of silica precursors.

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