• Sialon Powder Synonyms:

sialon powder, Si₂ON₂, silicon aluminum oxynitride powder, aluminum silicon oxynitride, ceramic composite,

• Sialon Powder Designations:

a) Chemical Name: Silicon aluminum oxynitride

b) Chemical Formulas: Si₂ON₂ / SiN-SiO2-Al2O3-AlN

c) Chemical Family: Ceramic composite

• Sialon Powder Description:

a) Sialon, a fine grain nonporous technical grade engineering material, is a silicon nitride ceramic with a small percentage of aluminum oxide added. It is a reacted mixture of SiN, SiO2, Al2O3 and AlN. 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.

b) 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.

c) "The discovery of an alloy of silicon nitride made independently in the UK by Jack and Wilson, and in Japan by Osama et al, brought the advantages of a material based upon silicon nitride, which was sinterable. Complex shapes could now be produced by conventional ceramics forming processes and then fired to high density products. These alloys, based upon silicon nitride, are known as sialons."

• Sialon Powder Chemical Properties Available:
  

  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	—	—

  
  
• Sialon Powder Physical Properties Available:

a) Excellent thermal shock resistance
b) Not wetted or corroded by nonferrous
c) High strengthcheck
d) Good fracture toughness
e) Good high temperature strength
f)  Low thermal expansion
g) Good oxidation resistance  

• Sialon Powder Typical Applications:

a) Thermocouple protection tubes for nonferrous metal melting
b) Immersion heater and burner tubes
c) Degassing and injector tubes in nonferrous metals
d) Metal feed tubes in aluminum die casting
e) Welding and brazing fixtures and pins 

• Sialon Powder Packaging:

Usually to customer's specification. 

• Sialon Powder TSCA (SARA Title III) Status:

Unknown. For further information please call the E.P.A. at +1.202.554.1404

• Sialon Product Page Last Updated:

11 April 2012