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Silicon nitride heater protection tube
Silicon nitride is the world's most effective material widely used in non-ferrous metal casting temperature measurement and temperature
control, silicon nitride heating element protection tube used in the casting industry immersion insulation furnace. The advantages of
immersion insulation furnace are very obvious, and in order to realize the heating body immersed in the metal melt, it is necessary to have
a protection tube that can protect the heating body well.
Advantages of silicon nitride protective tube :
Excellent thermal conductivity, thin tube wall (only a few millimeters), very fast response to temperature, can be measured in 1 minute liquid
metal temperature
It will not melt at high temperature, and there is no pollution to metal liquid
Excellent thermal shock resistance, oxidation resistance, thermal shock resistance
Strong erosion resistance, corrosion resistance, erosion resistance
Not easy to accumulate slag, easy to maintain
The product is electrical insulator
It can be used in alloy melts containing sodium and strontium components
The service life is more than 12 months, the longest can be used for several years, and the cost performance is very high
Comparison of performance of different heating methods:
No. | Compare Item | Radiant insulation furnace | Immersion holding furnace | Immersion method advantage |
1 | Heating method | The heating rod is radiatively heated at the aluminum liquid surface | The heating rod is heated inside the liquid aluminum | The heating rod is heated inside the liquid aluminum |
2 | Heating efficiency | 40-50% | 90-95% | High thermal efficiency |
3 | Heating power | 90Kw（1000Kg） | 16Kw（1000Kg） | Good power saving performance |
4 | Furnace temperature | 850-950°C | 650-700°C | Low aluminum loss |
5 | Burning rate of liquid aluminum | 1.5-2% | 0.30% | |
6 | Liquid surface slagging phenomenon | Grievous | Few | High quality liquid aluminum |
7 | Inspiratory phenomenon of liquid aluminum | Grievous | Lower | |
8 | Rate of warming | Slow | Fast | The temperature is rising fast |
9 | Furnace lining slagging and aluminizing | Grievous | Not easy to slag | Easy to maintain |
10 | Liquid aluminum depth | Less than 400mm | NO limit | More flexible |
11 | Temperature uniformity | The upper and lower temperatures differ by 10-20°C | Less than 5°C | Good quality |
12 | Furnace lining life | Slow | High | Long service life |
Silicon nitride protective tube performance indicators :
Performance | Ⅰ | Ⅱ | Ⅲ | ||
Density/(g/cm³) | 3.15≤ρ≤3.25 | ||||
Elastic modulus/GPa | 270≤E≤330 | ||||
Poisson's ratio | 0.23≤μ≤0.29 | ||||
Coefficient of thermal expansion (room temperature to 500℃)/X10-6/℃ | 2.0≤α≤3.7 | ||||
Bending strength/MPa | Four-point test | ≥750 | ≥650 | ≥530 | |
Three-point test | ≥820 | ≥720 | ≥550 | ||
Vickers hardness（HV） | ≥1420 | ≥1330 | ≥1270 | ||
Fracture toughness | ≥6 | ≥5 | ≥5 | ||
Crushing load ratio | 40% | 35% | 30% | ||
microcosmic structure | Air hole/μm | ≤10 | ≤10 | ≤25 | |
Inclusion | 25<S≤50 | ≤4 | ≤8 | ≤16 | |
50<S≤100 | ≤1 | ≤2 | ≤4 | ||
100<S≤200 | 0 | ≤1 | ≤25 | ||
S>200 | 0 | 0 | ≤1 | ||
Ceramic product processing accuracy :
Item | Precision value | ||||
Dimensional exact values | Up to 0.001mm | ||||
Degree of finish | Up to mirror | ||||
The number of concentricities | Up to 0.003mm | ||||
The number of parallelism | Up to 0.002mm | ||||
Bore tolerance | The minimum can be machined 0.005mm | ||||
Straight groove | The narrowest machined groove is 0.1*100mm | ||||
Thickness dimension | Minimum machining to 0.08mm | ||||
Screw thread | Min machining inner thread M2, outer thread no limited | ||||
Cylindricity dimension | Up to 0.004mm | ||||
Linear tolerance | Up to 0.001mm | ||||
Min aperture | The minimum processing capacity is 0.07mm |
Application area : low pressure casting.
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Jiangxi Silicon Nitride New Material Co., LTD  Building 19, Phase 4, Electronic Information Industrial Park, Hedong Industrial Park, Nancheng County, Fuzhou City, Jiangxi Province
19194976688 16679068073 sales@sixny.com.cn |
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