Advanced Technical Ceramics - Aluminium Oxide

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Technology abstract

Aluminium Oxide, Al2O3 is a major engineering material. It offers a combination of good mechanical properties and electrical properties leading to a wide range of applications.

Technology Description

The advanced technical ceramics aluminium oxide (Al2O3) is the most well known and cost effective ceramic material. Due to a combination of good strength, a high E- module, hardness and thermal shock resistance ceramics made of Al2O3 (alumina) are applied in high-temperature applications such as rings, cones, rods, disks, as well those where low friction is required.

These kind of parts are used in various applications like communication-amplifiers for satellites, travelling wave tubes, klystrons, (ion)thrusters, radars and sensors for onboard and ground systems for civil aerospace and (multi-pin) feed-throughs, power tubes, insulators etc.

Alumina can be produced in a range of purities with additives designed to enhance properties. A wide variety of ceramic processing methods can be applied including machining or net shape forming to produce a wide variety of sizes and shapes of component. In addition it can be readily joined to metals or other ceramics using metallizing and brazing techniques.
Process Capabilities:

  • Primary forming methods: isostatic and die pressing
  • Secondary forming: conventional and CNC green machining
  • Sintering kilns
  • Final forming: conventional and CNC hard machining
  • Metallising: cleanroom paint application
  • Metallising: sintering furnaces
  • Metallising: galvanic and cleaning lines
  • Brazing: lab vacuum brazing furnace
  • Various test equipments

Primary forming methods: isostatic and die pressing
Secondary forming: conventional and CNC green machining
In many cases it makes sense to replace metal by alumina due to the superior properties of ceram-ic material. The technology provider offers know how and service for companies considering the alternative for using a professional and technically matured ceramic solution.

The company received DIN EN ISO 9001 certification in 1996 and since 2004, DIN EN ISO 14001 certification is approved.
 

Innovations & Advantages

Material:
Until now Alumina is an excellent all-round material amongst all technical ceramics. Due to chang-ing requirements other materials such as AlN (aluminum nitride) is becoming more popular. It is lower in density and has a better thermal conductivity compared to alumina.

Depending on the specific type, these aluminium oxide ceramics feature a variety of properties:

  • Good strength and stiffness
  • Good hardness and wear resistance
  • Good corrosion resistance
  • Good thermal stability
  • Excellent dielectric properties (from DC to GHz frequencies)
  • Low dielectric constant
  • Low loss tangent

Process:
The metallizing process is very sophisticated. From the production of metallizing paint to the sinter-ing furnace and last but not least the clean-room, we entirely control this process

Current and Potential Domains of Application

Typical applications include:

  • Seal rings
  • Medical prostheses
  • Laser tubes
  • Electronic substrates
  • Ballistic armour
  • Thermocouple tubes
  • Electrical insulators
  • Grinding media
  • Thread guides
  • Wear components

Aluminium oxide ceramics are also used in components for medical device such as X-ray, CT-scanner and laser.

Due to a much higher life span or higher hardness/resistance to wear and tear ceramic material could easily replace plastic material or metal in many applications.