The industrial world of Technical Ceramics is a very wide and varied area covering many different material grades, such as AL203 Aluminium Oxide, Zr02 Zirconium Oxide, Si3N4 Silicon Nitride, SiC Silicon Carbise, AIN Aluminium Nitride, BN Boron Nitride, MgO Magnesium Oxide Etc ……………………. to mention but a few, Also, machinable ceramics such as,…….. Macor MGC Machinable Glass Ceramic, Shapal M soft & BNP2 machinable aluminium nitride can also be termed as technical ceramics, however, by far the most popular globally, is Alumina.
The use of technical ceramics in a large application field, IE, Very high temperature, Thermal Shock, Very high voltage resistance & instances of extreme wear, is justified by the diversity of properties offered by materials used for parts manufacturing, so you individual material selection is crucial to ensure the correct combination of properties. Usually they are shaped from the “green body” at room temperature and acquire their typical properties during a kiln firing / sintering process at high temperatures, there are many ways to for the green body shape, such as, …. Dry powder compaction, Isostatic pressing & HIP, Hot isostatic pressing, High & Low pressure injection molding, process dependent on component complexity and extrusion, all of these methods of manufacture allow for green machining in-between the molding process and the final sintering stage, these processes are usually subject to a mold tool being produced.
The chosen method of manufacture is usually determined by material selection combined with critical tolerances as some processes allow for far greater accuracy, however, when extremely tight tolerances are required, above and beyond those achievable by green machining & sintering alone, then we often combine this technique with a final diamond grinding process carried out after firing, where GS (grinding stock) would be carefully calculated and left on the parts, making it possible to achieve very tight tolerances of in some extreme cases of just a few microns via grinding lapping & polishing, it is course, only possible to check / measure these components on a CMM Coordinate Measuring Machine.
The following images are of Technical Ceramics in a range of materials ………………………….
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