| Sialon Sialon, a fine grain nonporous technical grade engineering material, is a silicon nitride ceramic with a small percentage of aluminum oxide added. Sialon is outstanding in nonferrous metal contact. It is highly thermal shock resistant, strong, and is not wet or corroded by aluminum, brass, bronze, and other common industrial metals. | .Key Properties |  | Excellent thermal shock resistance | | Not wetted or corroded by nonferrous metals | | High strength | | Good fracture toughness | | Good high temperature strength | | Low thermal expansion | | Good oxidation resistance | .
Typical Uses | | Thermocouple protection tubes for nonferrous metal melting | | Immersion heater and burner tubes | | Degassing and injector tubes in nonferrous metals | | Metal feed tubes in aluminum die casting | | Welding and brazing fixtures and pins | General Information
The combination of silicon nitride and aluminum oxide produces a material with the excellent strength, hardness, fracture toughness and low thermal expansion of silicon nitride, enhanced by corrosion resistance, good high temperature strength and oxidation resistance imparted by the aluminum oxide. Back to top Engineering Properties* | Sialon | | Mechanical | SI/Metric (Imperial) | SI/Metric | (Imperial) | | Density | gm/cc (lb/ft3) | 3.24 | (202.3) | | Porosity | % (%) | <1% | (<1%) | | Color | — | gray | — | | Flexural Strength | MPa (lb/in2x103) | 760 | (110) | | Elastic Modulus | GPa (lb/in2x106) | 288 | (42) | | Shear Modulus | GPa (lb/in2x106) | 120 | (17.4) | | Bulk Modulus | GPa (lb/in2x106) | 220 | (32) | | Poisson’s Ratio | — | 0.25 | (0.25) | | Compressive Strength | MPa (lb/in2x103) | — | — | | Hardness | Kg/mm2 | 1430–1850 | — | | Fracture Toughness KIC | MPa•m1/2 | 6.0–7.5 | — | Maximum Use Temperature
(no load) | °C (°F) | 1200 | (2200) | | Thermal | | | | | Thermal Conductivity | W/m•°K (BTU•in/ft2•hr•°F) | 15–20 | (104–138) | | Coefficient of Thermal Expansion | 10–6/°C (10–6/°F) | 3 | (1.7) | | Specific Heat | J/Kg•°K (Btu/lb•°F) | — | — | | Electrical | | | | | Dielectric Strength | ac-kv/mm (volts/mil) | — | — | | Dielectric Constant | — | — | — | | Dissipation Factor | — | — | — | | Loss Tangent | — | — | — | | Volume Resistivity | ohm•cm | — | — | *All properties are room temperature values except as noted.
The data presented is typical of commercially available material and is offered for comparative purposes only. The information is not to be interpreted as absolute material properties nor does it constitute a representation or warranty for which we assume legal liability. User shall determine suitability of the material for the intended use and assumes all risk and liability whatsoever in connection therewith. Back to top Standard Products | Custom Products and Services | Case Studies | Materials
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