Syalon 201

Syalon 201 is an advanced silicon nitride (Si3N4) ceramic offering outstanding mechanical properties up to 1350°C.

Syalon 201, a silicon nitride based advanced ceramic, is a specially formulated grade based on the β-sialon phase found in Syalon 101 but with a crystalline intergranular phase of yttrium aluminium garnet (YAG). This enables Syalon 201 to exhibit significant retention of strength at high temperatures up to 1350°C.

Syalon 201 is an outstanding engineering grade material which is characterised by excellent high temperature strength and hardness. It has found use in molten metal handling applications where the use of Syalon 101 is limited due to its reduction in strength above about 1000°C.

The table below lists typical mechanical, thermal and electrical property data for Syalon 201.

Physical property data for Syalon 201

Property Value Units
Composition β-Sialon -
Density 3.24 g/cc
Porosity 0 %
3 point Modulus of Rupture at 20°C
(Specimen 3 × 3 × 50mm, span 19.05mm)
825 MPa
3 point Modulus of Rupture at 1000°C 750 MPa
3 point Modulus of Rupture at 1350°C 600 MPa
Weibull Modulus 10 -
Young's Modulus of Elasticity 290 GPa
Poisson's Ratio 0.23 -
Hardness (HRA) 92.7 -
Hardness (Vickers Hv50) 16.18 (1650) GPa (Kg/mm2)
Fracture Toughness K1C 4.5 MPa m½
Thermal Expansion Coefficient (0-1200°C) 3.0X10-6 K-1
Thermal Conductivity 21 W/(mK)
Thermal Shock Resistance 600 ΔT°C quenched in cold water
Maximum Use Temperature 1450 °C
Electrical Resistivity 1012 ohm cm

Typical physical property data obtained under test conditions. All properties have been measured by independent testing authorities. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.

The successful integration of advanced technical ceramics into engineering systems requires close collaboration between you, the end-user, and ourselves, the material suppliers. Please contact our Technical Department to discuss your requirments in detail and assist in exploiting the significant advantages which silicon nitride based sialon fine ceramics offer.

In addition, see our resources section for guides on designing with ceramics and more property data comparing Syalon 201 with other engineering ceramics.