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Alumina/Silica/Boria ( Al2O3 70/SiO2 28/B2O3 2 )

Material Information

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We stock and supply the following standard forms:
Fibre
Fibre

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Common Brand Names:
Nextel® 440
 
General Description:  

Nextel® 440 and Nextel® 312 are two similar materials - compositions of ceramic specially developed for the production of continuous filament yarns which are sufficiently flexible to manufacture conventional textile articles such as fabrics and sewing threads whilst retaining much of the high temperature and chemical resistance typical of ceramics. Nextel® 440 has somewhat better tensile properties and a higher upper working temperature but is less flexible than Nextel® 312 and is available from Goodfellow as a yarn.

The fibres are coated with finishes during manufacture which can be removed, if desired, by "heat cleaning" at about 550C. If the best possible properties are required, further heat treatment at about 1215C should be used. More details of recommended treatment methods are available on request.

   

Chemical Resistance

Acids - concentrated Fair
Acids - dilute Good
Alkalis Poor-Fair

Electrical Properties

Dielectric constant 5.7 @ 9.4GHz

Mechanical Properties

Tensile modulus ( GPa ) 185

Physical Properties

Density ( g cm-3 ) 3.05
Refractive index 1.62

Thermal Properties

Coefficient of thermal expansion @20-1000C ( x10-6 K-1 ) 5
Specific heat @500C ( J K-1 kg-1 ) 1000
Sublimation point ( C ) 1800
Upper continuous use temperature ( C ) 1350-1650

Properties for Alumina/Silica/Boria Fibre

Property Value
Coefficient of thermal expansion - Longitudinal x10-6 K-1 4.4
Density g cm-3 3.05
Modulus GPa 180
Tenacity GPa 2.0

Buy Alumina/Silica/Boria on-line

We stock and supply the following standard forms:
Fibre
Fibre

Choose a form to search our on-line catalogue  

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