Sialon Powders – Syalon 21R and 21RF Polytype Powders

International Syalons manufacture a range of sialon powders. Theses include 21R Polytype and 21RF Polytype powders.

21R and 21RF Polytype SiAlON Powders

Syalon 21R Polytype is a silicon aluminium oxynitride structural modification of aluminium nitride (AlN), having the formulation (SiAl6O2N6). It is a refractory material which is predominately used in sialon formulations. It is used to increase the aluminium and nitrogen content of sialon formulations but has the advantage over AlN in that it is not readily hydrolysed by water. This allows sialon formulations containing 21R Polytype to be processed by aqueous slip casting or spray drying, for example.

Composition and Particle Size of 21R Polytype SiAlON Powders

The table below shows the typical composition and particle size for 21R Polytype, which is available in two grades, standard 21R and fine 21RF.

Table 1. Typical property data for 21R Polytype and 21RF Polytype.

21R Polytype SiAlON Powder
21RF Polytype SiAlON Powder
Property
Value
Units
Property
Value
Units
21R Polytype
>90
%
21RF Poyltype
>90
%
Aluminium Nitride (AlN)
<10
%
Aluminium Nitride (AlN)
<10
%
Iron (F)
<0.10
%
Iron (F)
<0.10
%
Calcia
<0.02
%
Calcia
<0.02
%
Oxygen (O)
9.3
%
Oxygen (O)
10.3
%
D50
<5.50
μm
D50
<2.50
μm

This information has been sourced, reviewed and adapted from materials provided by Internatrional Syalons.

For more information on this source, please visit International Syalons.

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