Si3N4 Silicon Nitride Riser Tubes

Silicon nitride liquid riser tube (liquid riser tube for automobile aluminum alloy wheel hub casting)

Lift tubes are mainly used in low-pressure casting aluminum alloy products, especially in low-pressure casting machines for automobiles, motorcycle wheels and other components. During operation, the die-casting machine is placed in a closed holding furnace containing aluminum melt, directly in contact with the metal solution, and the temperature is about 700°C. Every 3-5 minutes, the die-casting machine applies a certain air pressure to the aluminum solution surface, and the aluminum solution is The flow is lifted from the riser tube to the mold cavity for casting, realizing automation and continuity. During the aluminum filling process, there is a pressure of 0.8~1㎏/㎝2, which requires the liquid riser tube to have excellent thermal shock fatigue resistance, excellent corrosion resistance, high strength and good air tightness.

Silicon nitride liquid riser tube has excellent properties such as corrosion resistance, low thermal expansion coefficient, good thermal shock resistance, no slag, no explosion, and long service life. Its excellent oxidation resistance, thermal shock stability, and non-wetting characteristics with molten aluminum and other molten metals make it an ideal material for the metallurgical low-pressure casting industry. The use of silicon nitride liquid riser tubes not only improves the quality of castings, but also significantly reduces the operating costs of low-pressure casting. Its service life is 5-20 times that of traditional liquid liters, which greatly reduces the number of replacements of the liquid liter pipe, fully ensuring the continuity and automation of production, and is widely used in the aluminum smelting industry, non-ferrous smelting industry, etc.