Product Description

ALUMINA CERAMICS This is ceramics produced of aluminum oxide (alumina) having the Al2O3 content of even up to *9.*9%.

There are various technologies used for fabrication of ceramic products and the most frequently used ones are pressing, single-and double side and isostatic, then extruding and casting. Choice of technology depends on the desired shape and quality of products. The pressed green parts ere strong enough to be machined to the final shape and approximate dimensions.

The most important operation in production of ceramic parts is high-temperature sintering. Ceramics is sintered at temperature of ********3 °K and fine polycrystalline structure is achieved.

Owing to such a high purity and manufacturing technology, ceramics has excellent mechanic, electric, thermal and chemical characteristics. Ceramic products produced in this way have dimensional deviations of about 2%, as defined by DIN ****0 standards. Therefore, an effort should be made that design tolerances are within the allowed limits. The best effects are achieved by a mutual agreement between a manufacturer and customer.

If requirements upon dimensional preciseness of the ceramic products are more demanding, these can be met by subsequent machining (grinding, lapping, polishing), what enables the dimensional accuracy equivalent to metallic parts.

Diamond tools do subsequent machining and polishing pastes so that high quality of surface finish is obtained:

Surface roughness

- As fired surface Ra = 0.4 - 1.6 µm
- Ground and lapped surface Ra = 0.4 - 0.8 µm
- Polished surface Ra = 0.1 - 0.4 µm