Sialon

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For over 60 years we have been a precision machining and polishing fabricator of parts from all technical ceramics, sapphire, glass and quartz. We machine these materials to very precise tolerances (many times measured in millionths of an inch) for dimension, flatness, wedge and roundness or cylindricity. Our customers typically have a critical application that requires extremely tight tolerances in ultra-hard materials. We also have the capability to grind and polish spherical radius parts in a variety of hard materials, both inside and outside diameters, to optical requirements.

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Sialon is a reacted mixture of SiN, SiO2, Al2O3 and AlN

PropertyValue
General
Chemical Formula

SiN-SiO2-Al2O3-AlN

Mechanical
Density
3.1 - 3.7 gm/cc
Hardness

1600-1800 Knoop

Tensile Strength
28 kpsi
Modulus of Elasticity

46 x 106 psi

Flexural Strength
110 kpsi
Compressive Strength
300 - 510 kpsi
Poisson's Ratio
0.21
Fracture Toughness
4 - 5 MPa m<sup>½</sup>
Electrical
Dielectric Strength
212 ac V/mil
Dielectric Constant
9.3 (@ 1 MHz)
Volume Resistivity

> 1014 ohm-cm

Thermal
Coefficient of Thermal Expansion

2.7 - 6.8 x 10-6/°C

Thermal Conductivity
18 - 25 W/mK
Specific Heat
0.21 cal/g °C
Shock Resistance
300 °C Diff.
Maximum Working Temperature
1700 °C

All properties are at room temperature unless otherwise noted.

Engineering data are representative, and are not intended as absolute nor warrantable. Manufacturer’s Data shown is blended from multiple sources and therefore illustrates the marketplace.

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