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Silicon nitride riser
Silicon nitride riser is a kind of special refractory ceramic material, it is one of the key components of low pressure casting machine, its performance and stability directly affect the quality and production efficiency of casting products.
The working principle is: the lower end is inserted into the aluminum alloy molten liquid of the holding furnace, the upper end is connected to the casting mold cavity, and the aluminum alloy molten liquid enters the mold cavity from the bottom to the top through the pressure. According to the working conditions, the riser pipe should have good thermal shock resistance, corrosion resistance of aluminum alloy molten liquid, non-wetting with aluminum alloy molten liquid, good air tightness and thermal shock fatigue resistance.
Advantages of silicon nitride riser :
Corrosion resistance
High temperature resistance
Good sealing performance
Good thermal shock resistance, no slag, no explosion
The oxidation resistance and non-wetting characteristics with aluminum molten liquid and other metal solutions make it an ideal material for the riser pipe, water nozzle, riser and so on in the metallurgical low pressure casting industry
Long service life, small loss: its service life is 5-20 times that of the traditional riser, which greatly reduces the number of replacement of the riser, fully realizes the continuity and automation of production, and fundamentally solves the bottleneck problem of China's low-pressure casting industry and auto parts industry
Silicon nitride riser 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 : aluminum smelting industry, wheel casting industry, etc. (riser for wheel 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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