|SILICON CARBIDE (SiC)|
|The product||Silicon carbide is a non-oxide material artificially produced in electric kilns at high temperature, two crystalline phases exist: ALPHA and BETA. Our types are all in the ALPHA phase.|
|Properties||Excellent resistance to wear, thermal shock and corrosion. Low thermal expansion, high thermal conductivity, high strength at low and high temperatures, good electrical conductor, low friction coefficient.|
|Applications|| Thanks to the typical high thermal conductivity, silicon carbide thread guides are particularly suitable for highly aggressive yarns and where there are thread guide over heating problems.
Low temperature of thread guide drastically reduces problems connected with spin finishes.
In addition, thanks to its good electrical conductivity antistatic thread guides can be produced, to discharge the electrostatic charges, which can form on man-made fibres at high speeds.
|Production processes||Dry and isostatic pressing; injection moulding; hot pressing.|
The following table gives physical and mechanical data. Material data are obtained from specimens according to international test specifications. The indicated values cant be extended to components and parts with different shapes and surface finishings.
Bettini S.r.l. reserves the right to make technical modifications.
Bettini also produces infiltrated silicon carbide and hot moulded silicon carbide for mechanical applications (see Bettini technical catalogue).
Standard tolerances: up to 10mm: ± 0.2mm, above 10mm: ± 2%
Bending deformation: max. 0.5% of part length
Very close tolerances can be reached by grinding and polishing sintered parts, normally up to quality class IT8. Few microns tolerances can be achieved if needed.
|Surface finishings|| The sintered products are manufactured with the following surface finishings|
|Some examples of microstructure||
The examples reported are indicative only. For further information please contact our
Friction coefficient diagram for material with Ra ≤ 0,4µm