Si3N4 Nozzle Silicon Nitride Ceramics Oxidation Resistance High
Toughness
Silicon nitride nozzles and covers have the characteristics of
oxidation resistance, high temperature strength and less sputter
adhesion, which can prolong the service life of the welding parts.
In the five methods of silicon nitride production, GPSN is most
commonly used to produce Si3N4 components. Here we introduce Gas
pressure sintering (GPS):
Gas pressure sintering of silicon nitride is performed at a
pressure of 1 to 10 MPa at a temperature of about 2000 ° C. The
high nitrogen pressure suppresses the pyrolysis of silicon nitride.
Due to the use of high-temperature sintering, it is sufficient to
promote Si3N4 grain growth with the addition of less sintering
aids, and obtain high-toughness ceramics with long columnar grains
in situ growth density of> 99%. High toughness, high strength
and good abrasion resistance can directly produce various complex
shaped products close to the final shape, which can greatly reduce
production costs and processing costs.
Silicon Nitride Nozzle & Covers Description
| Size | Customized |
| Color | Black |
| Density | 3.22 g/cm3 |
| Flexural strength | 800 MPa |
| Fracture toughness | 6.5 MPa m^1/2 |
| Thermal stress parameters | 569 K |
Data Sheet & Typical properties of silicon nitride material:
| Item | Unit | Si3N4 |
| Type | – | Gas pressure sintered |
| Density | g/cm3 | 3.22 |
| Color | – | dark grey |
| Water Absorption | % | 0 |
| Young Modulus | Gpa | 290 |
| Vickers Hardness | Gpa | 18 – 20 |
| Compressive Strength | Mpa | 2200 |
| Flexural Strength | Mpa | 650 |
| Thermal Conductivity | W/m.K | 25 |
| Thermal Shock Resistance | Δ(°C) | 450 – 650 |
| Max. Working Temp. | °C | 1200 |
| Volume Resistivity | Ω ·cm | > 10^14 |
| Dielectric Constant | – | 8.20 |
| Dielectric Strength | kV/mm | 16 |
* Tests under room temperature environment;
* The above information is offered for comparison only. Exact
properties will vary depending on the manufacturing method. |
Typical properties of silicon nitride ceramics
-High strength over a wide temperature range
-High fracture toughness
-High hardness
-Outstanding wear resistance
-Low thermal expansion and high thermal conductivity
-Good thermal shock resistance
-Good resistance to chemical and oxidation
Send inquires to sales@industrial-ceramicparts.com for more information or any questions.
Packing of Silicon Nitride Nozzle and Covers
As a ceramic material, silicon nitride is quite fragile in a lot of cases. Our
silicon nitride nozzle and covers are carefully handled to minimize
damage during storage and transportation. Suitable outer boxes and
inner cushioning materials are used for Si3N4products, vacuum
packing is also engaged for some of the parts.
