NSiC Riser Tube
Silicon Nitride Bonded Silicon Carbide (Si₃N₄ bonded SiC) riser tube is a high-performance ceramic component specially developed for low-pressure die casting and gravity casting of aluminum alloys. It is manufactured by high-temperature reaction sintering of silicon carbide and silicon powder under nitrogen atmosphere, featuring excellent thermal shock resistance, high strength, low thermal expansion, superior corrosion resistance against molten aluminum, and long service life.
This riser tube serves as the core channel for transporting molten aluminum from the holding furnace to the mold in low-pressure casting systems. It stays stable under repeated rapid heating and cooling cycles, hardly wets by molten aluminum, reduces aluminum adhesion and clogging, cuts downtime for cleaning and replacement, and effectively improves casting yield and production consistency.
1. Excellent Molten Aluminum Resistance
Non-wetting property with aluminum melt, minimal aluminum buildup on inner and outer surfaces. Less frequent cleaning, avoids blockage and casting defects.
2. Outstanding Thermal Shock Stability
Low thermal expansion coefficient, resistant to cracking under frequent temperature fluctuations during cyclic casting runs. Greatly reduces unexpected breakage risk.
3. High Mechanical Strength & Wear Resistance
High bending strength at both room and high temperatures, good abrasion resistance, maintains structural integrity under long-term continuous production.
4. Dense & Stable Microstructure
Low porosity, airtight structure. No gas release when contacting molten aluminum, prevents pores and inclusions in aluminum castings.
5. Customizable Dimensions
Available in various diameters, lengths, flange shapes and connection sizes. We support custom machining to match different low-pressure casting furnaces and production lines.
- Low-pressure die casting of aluminum alloy: automotive wheel hubs, engine parts, chassis components
- Aluminum gravity casting & aluminum liquid transfer systems
- Holding furnace for aluminum alloy foundry
- New energy vehicle aluminum casting parts production
Frequently Asked Questions
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We are a real manufacturer, our factory is specialized in producing refractory materials for more than 30 years. We promise to provide the best price, the best pre-sale and after-sale service.
For each production process, RBT has a complete QC system for chemical composition and physical properties. And we will test the goods, and the quality certificate will be shipped with the goods. If you have special requirements, we will try our best to accommodate them.
Depending on the quantity, our delivery time is different. But we promise to ship as soon as possible with guaranteed quality.
Of course, we provide free samples.
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We have been making refractory materials for more than 30 years, we have strong technical support and rich experience, we can help customers design different kilns and provide one-stop service.
