Our silicon nitride components, in the high temperature and high pressure working environment of aluminum casting, not only can maintain good mechanical strength and heat conduction properties, but also they do not react with aluminum liquid, do not stick to aluminum slag, and have extremely excellent heat shock, wear and corrosion resistance. It can replace imported products from Japan and has a higher cost performance. We are confident that our products will minimize molten aluminum liquid impurity pollution, while the service life in hot and cold chamber aluminum casting equipment is longer, so as to help you produce higher quality aluminum castings, improve production efficiency, and for you to significantly reduce labor maintenance costs, increase profits.

Heater Protection Tube 

Ruihong's heater protection tube (radiation tube) advantages: high temperature resistance, corrosion resistance, thermal shock resistance, strong oxidation resistance, fast thermal conductivity, and molten aluminum does not infiltrate. Thus reducing and eliminating the occurrence of cracking and crushing in the installation and use process, long service life, low replacement frequency, not only greatly reduce the cost of equipment maintenance for customers, but also ensure the purity of molten aluminum, improve the quality of aluminum die-casting parts, and meet the needs of customers for low-pressure casting continuous, high-quality production.

■  Low energy consumption 

The immersion heating method is used, and the heat source is located in the middle of the molten aluminum, so the heat transfer performance is excellent, which can help you greatly reduce the consumption of electric energy and save costs compared to the previous upper radiant heating method.

■  Improve the quality of molten aluminum

Because the heat source is located in the middle of the molten aluminum, the heat is transferred from bottom to bottom, so the molten aluminum forms convection from top to bottom, fully ensuring that the molten aluminum is heated evenly, and the molten aluminum in the upper part of the furnace will not be oxidized because of overheating, reducing the loss of aluminum, helping you improve the quality of the molten aluminum, and reducing the damage of the furnace wall.

■  Long life

It has strong corrosion resistance, does not penetrate in molten aluminum, and has high mechanical strength and excellent impact resistance, thus extending the service life.

Riser tube & Stalk 

Riser tube & Stalk is the key part of the low pressure casting machine for casting aluminum alloy products(such as aluminum wheels,other aluminum alloy products), In die casting process ,molten aluminum(700-900)is sent from riser tube to mould cavity evert 3-5 minutes . Ruihong's silicon nitride riser tubes have excellent corrosion resistance, low thermal-expansion coefficient ,its service life is 5-20 times longer than usual material , after using,it can improve the quality of aluminum alloy products,Significantly reduce labor maintenance costs and increase profits for you.

The performance of our products can replace those imported from Japan, while the price is over 50% lower than that of imported products. Our company has been a long-term partner of YAMAHA, SRTIKO WESTOFEN, DICASTAL, Changan, Aikedi and Wencan, etc.  We will constantly carry out research and development and innovation in technology to provide customers with a complete set of all-round alloy casting and refining processing solutions. The company has established a professional R&D center and after-sales service team. Adhering to the business philosophy of "excellent quality, integrity as the foundation, and service first", it provides customers with high-quality products, reasonable prices and sincere services.

When riser tube & stalk is connected with the furnace and the mold, the seal should be tight. The tightness of the gas seal gap and the selection of sealing materials are very important. When it is too tight, the pressure is large, the force is easy to fracture for a long time, and the gas will leak in a short time when it is too loose. In addition, the selection of the sealing pressing part should be reasonable to avoid the displacement of the stalk's  flange force and shorten the service life. To grasp the gap, materials, installation methods and other links gradually accumulate experience.

■  Preparation before use

The stalk should be fully preheated before entering the furnace. If it is heated with a gas torch, it should be slowly and evenly inside and outside to avoid local excessive heating. When the temperature reaches 600°C, the tank will turn dark red, and the time will be about 30 minutes. You can also put the stalk in the furnace, so that the bottom of the stalk is about 2 centimeters away from the aluminum liquid surface, and wait for the wall of the stalk to be all red (about 30 minutes), you can slowly put into the molten aluminum. This operation can not only dry the moisture in the stalk, but also avoid the explosion caused by sudden temperature rise of the stalk. 

■  Pay attention in use

When using the stalk, we must pay attention to reduce the knock on the pipe mouth, especially after plugging aluminum can not be hard hit. When replacing the mold and repairing the equipment, the impact vibration should be reduced as much as possible, and the exposed parts of the stalk should be kept warm to prevent acute cooling. When slagging, pay attention not to directly collide with the stalk, and when adding molten aluminum, pay attention to avoid directly pouring on the body of stalk.

■  Furnace maintenance

When the furnace shutdown maintenance equipment must take the stalk out of the oven, do not put the hot stalk directly on the ground, should be wrapped with refractory materials and placed in a place that is not directly blown by cold wind.

Thermocouple Protection Tube

Ruihong's silicon nitride ceramic has the best thermal conductivity when used for aluminum melting. Its quickly response to the temperature is widely used as temperature sensor in aluminum and other nonferrous metals melting. 

■  Excellent shock resistance and light weight make it easier to operate and maintain.

■  Long service life (1 to 2 years)

■ Thermocouple set: straight and L type

■ OD28 / ID16     L400-1200mm

■ OD30 / ID20     L400-1200mm

ADVANTAGES: 

■  There is no eluted contamination into molten aluminum.Therefore, the purity of the metal is maintained.

■  Superb thermal shock resistance.

■  Light weight, high strength, and easy to handle.

■  Even with flux, Ruihong's thermocouple protecgtion tubes are hardly eroded, which ensures long life.

Degassing Rotor

To remove H2 gas from molten aluminum, a silicon nitride pipe is used to feed the N2 or Ar gas. As silicon nitride rotor is used to stir and disperse the gas throughout the molten aluminum bath.

■ Unlike graphite,the silicon nitride is hardly eroded by oxygen at elevated temperatures. This permits long operating life.

■  High density and high strength assure reliable and stable operation in high speed rotation.

■ High thermal shock resistance allows repeated insertion and  withdrawal from molten aluminum in batch operation.

■ Strong corrosion resistance and good corrosion resistance, no pollution to molten aluminum, help to improve the quality of molten aluminum, to ensure high processing accuracy and tightness.

■ Non-adhesive aluminum, no accumulation of aluminum slag, improve the reliability of equipment, reduce equipment maintenance costs.

■ The degassing efficiency varies greatly depending on the shape of the rotor and other conditions, so we can offer you the right solution for the application environment.