Introduction Si3N4 silicon nitride stopper pipe
Stopper pipe–Silicon nitride ceramic has high density and abrasion resistanc. It is most suitable material used for low pressure die casting. The stopper pipe has the most favorable properties of protectiveness, impermeability and excellent precision.
The life time of stopper pipe can be used for many years if keeping regular maintenance. Otherwise, incorrect coperation and less attention to a maintenance will reduce the life time.
Characteristics Si3N4 silicon nitride stopper pipe
The impermeability is very important when used for low pressure die casting.
1. Low energy consumption
We use submergible heating element and heat source is in the centre of aluminum solution .So we have great heat-transfer performance which can save more energy consumption than traditional heating methods..
2. Low raw material loss ,improve the quality of die casting parts
Heat source in the centre of aluminum solution can fully ensure it heated evenly. Aluminum solution at the top of the kiln will not be oxidated because of overheated. As thus, the loss of aluminum will be lower, the quality of aluminum casting parts will be better, at the same time, the damage due to residue of aluminum dregs in the kiln wall will be reduced.
3. long life time
Excellent corrosion resistance, the best mechanical strength and excellent thermal shock resistance, these characteristics extend the lifespan..
Technical Data Sheet of Si3N4 silicon nitride stopper pipe
| Item | Unit | F-200 | F-500 |
| Bulk density | g/cm3 | 3.2 | 3.2 |
| Water absorption | % | 0 | 0 |
| Bending strength | Mpa | 750 | 800 |
| Young modulus | Gpa | 280 | 290 |
| Fracture toughness | Mpa.m1/2 | 6.5 | 7 |
| Poisson’s ratio | – | 0.28 | 0.28 |
| Vickers hardness | Gpa | 15 | 15 |
| Coefficient of linear expansion | x10-6℃ | 3.4 | 3.5 |
| Thermal conductivity | W/(m.k) | 26 | 50 |
| Specific heat | J/(g.k) | 0.65 | 0.61 |
| Volume resistivity | Ω.cm | >10^14 | >10^14 |
| Heat shock resistance | ℃ | 800 | 900 |
| Max operation temp. | ℃ | 1150 | 1150 |
