Powders
International Syalons manufacture a range of sialon powders. Theses include 21R Polytype, Beta-Sialon and Alpha-Sialon.
21R Polytype
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. Its principle advantage over AlN is that it is stable in aqueous environments, unlike AlN, which hydrolyses very rapidly in water. This allows sialon formulations containing 21R Polytype to processed by aqueous slip casting or spray drying, for example.
The table below shows the typical composition and particle size for 21R Polytype, which is available in two grades, standard 21R and fine 21RF.
Typical property data for 21R Polytype and 21RF Polytype
| Property | Value | Units |
|---|---|---|
| 21R Polytype | > 90 | % |
| Aluminium Nitride (AlN) | < 10 | % |
| Iron (Fe) | < 0.10 | % |
| Calcia (CaO) | < 0.02 | % |
| Oxygen (O) | 9.3 | % |
| D50 | < 5.50 | μm |
| Property | Value | Units |
|---|---|---|
| 21R Polytype | > 90 | % |
| Aluminium Nitride (AlN) | < 10 | % |
| Iron (Fe) | < 0.10 | % |
| Calcia (CaO) | < 0.02 | % |
| Oxygen (O) | 10.3 | % |
| D50 | < 2.50 | μm |
Typical property data obtained under test conditions. The values given only apply to the test bodies on which they were determined, and therefore can only be recommended values. See our disclaimer.
Beta-Sialon
Beta-Sialon is a pressureless sinterable powder, which under the right conditions can be sintered into a fully dense beta-sialon body, with physical properties equivalent to those of Syalon 101. It is available in a spray dried ready to press form, containing binders, or a slip castable form, without binders.
The table below shows the typical composition and particle size for spray dried Beta-Sialon.
Typical property data for Beta-Sialon
| Property | Value | Units |
|---|---|---|
| Silicon Nitride (Si3N4) | 90 | % |
| Aluminium Nitride (AlN) | 1 | % |
| Yttrium Oxide (Y2O3) | 6 | % |
| Aluminium Oxide (Al2O3) | 3 | % |
| D50 | < 1.0 | μm |
| Spray dried D50 | 90 | μm |
Typical property data obtained under test conditions. The values given only apply to the test bodies on which they were determined, and therfore can only be recommended values. See our disclaimer.
Alpha-Sialon
Alpha-Sialon is a pressureless sinterable powder, which under the right conditions can be sintered into a fully dense alpha-sialon body, with physical properties equivalent to those of Syalon 050. It is available in a spray dried ready to press form, containing binders, or a slip castable form, without binders.
The table below shows the typical composition and particle size for spray dried Alpha-Sialon.
Typical property data for Alpha-Sialon
| Property | Value | Units |
|---|---|---|
| Silicon Nitride (Si3N4) | 80 | % |
| Aluminium Nitride (AlN) | 12 | % |
| Yttrium Oxide (Y2O3) | 6 | % |
| Aluminium Oxide (Al2O3) | 2 | % |
| D50 | < 1.0 | μm |
| Spray dried D50 | 90 | μm |
Typical property data obtained under test conditions. The values given only apply to the test bodies on which they were determined, and therfore can only be recommended values. See our disclaimer.
For more information on these powders or to get a quotation, please contact us. Alternatively download our Sialon Powders PDF.