Aluminum Titanate-silicate Ceramics
Aluminum titanate
Spruebush is located between the lift tube and the lower mold to form a low-pressure runner. In the pouring process, it can make the alloy liquid fill the mold smoothly and remove the inclusions in the alloy liquid, which is conducive to the exhaust of the mold. The spruebush ensures that no secondary oxidation slag inclusion occurs in the medium chamber during the whole die casting process.
During low-pressure die casting, the aluminum liquid in the holding furnace of die casting machine enters the mold chamber from the lift tube through the sprue cup and spruebush under pressure, then becoming sequentially solidified by the cooling system under pressure. Thus, the sprue part plays the role of die casting head.
In the low-pressure die casting process of aluminum alloy wheel hub, the sprue system is particularly important. It can make the mold chamber smoothly filled with molten aluminum. It will also play a feeding role in the solidification stage of product green body to obtain a die casting product with dense internal structure. Locating at the junction of sprue system and molding system, the spruebush is a core part of the aluminum alloy wheel hub die casting system. It can be called the throat of the die casting system. Its structure design and material selection play an important role in the filling and solidification of product profile.
Comparing with ceramic spruebush, the traditional metal spruebush has problems such as fast corrosion, fast heat conduction, difficult adjustment of die casting process, large fluctuations and so on in low-pressure die casting process. Especially, the traditional one is greatly affected by the environment and raw material temperature in low-pressure die casting process.
Aluminum titanate ceramic spruebush has strong corrosion resistance, non adhesion to aluminum, better thermal insulation and high temperature resistance. It effectively ensures the temperature of the feeding channel. In this way, it makes the die casting feeding unaffected when the cooling intensity of other die casting parts is significantly increased. Meanwhile, the production efficiency and quality of die castings have been significantly improved. The weight of waste at the final solidified lift tube is only half of that of traditional one.
Aluminum titanate is a mixture of aluminum oxide and titanium dioxide in a certain chemical proportion. Its structure belongs to the orthorhombic crystal system.
Characteristics of Aluminum titanate
1. Low coefficient of thermal expansion;
2. Excellent thermal shock resistance;
3. It does not infiltrate with non-ferrous metal melt such as aluminum melt;
4. Excellent corrosion resistance.
Lift tube
Aluminum titanate is a mixture of alumina and titanium dioxide in a certain chemical proportion. Its structure belongs to the orthorhombic system.
Aluminum titanate ceramics have high melting point (1860 ℃ ± 10 ℃) and low coefficient of thermal expansion (at rt-1000 ℃, α＜ two × 10-6 / ℃), as well as excellent thermal shock resistance. In addition, it has the characteristics of non wetting with many metal melts and glass melts, especial for non-ferrous metals. Thus, aluminum titanate ceramics can be widely used in harsh environments, such as high temperature resistance, thermal shock resistance, corrosion resistance, and so on.
Low-pressure die casting lift tube is one of the key components of low-pressure die casting machine. During the die casting process, the aluminum melt with temperature of 700 ℃ ~ 900 ℃ is pressed into the mold chamber from the lift tube every 3 ~ 5 minutes. In the traditional production process, steel liquid lift tube is used. Due to its poor thermal shock resistance and corrosion resistance, its short service life and frequent replacement can not meet the requirements of continuous and high-quality production. Aluminum titanate is an ideal material for liquid lift tube due to its low coefficient of thermal expansion, excellent thermal shock resistance, non-stick aluminum and so on. Our company adopts German technique to produce aluminum titanate liquid lift pipe, whose service life and comprehensive performance have reached the international advanced level.
Characteristics of aluminum titanate liquid lift pipe
1. Low coefficient of thermal expansion
2. Excellent thermal shock resistance
3. It is not wetted with aluminum melt and other non-ferrous metal melt
4. Excellent corrosion resistance
5. High temperature resistance (it can be used at 1400 ℃).
6. It can well adapt to the oxidation problem at high temperature and make the low-pressure die casting machine realize automation and continuity in the production process, thus improving its production efficiency and reducing production costs.
Production technique
Isostatic pressure
Technical index of lift pipe
|
Volume density |
3.3-3.5g/cm3 |
|
Bending strength at room temperature |
30-50MPa |
|
Apparent porosity |
< 8% |
|
Coefficient of thermal expansion |
0.5-1.5*10-6/℃ |
|
Thermal conductivity |
0.86 W/m.k |
|
Outer diameter (mm) |
Inner diameter 内径(mm) |
Length (mm) |
|
Φ78 |
Φ58 |
850 |
|
Φ100 |
Φ80 |
400 |
|
Φ120 |
Φ100 |
600，800 |
|
Φ130 |
Φ110 |
1063 |
|
Φ130 |
Φ100 |
750 |
|
Φ120 |
Φ70 |
1220 |
|
Φ120 |
Φ80 |
950 |
|
Φ100 |
Φ60 |
900 |
|
Φ114 |
Φ68 |
1100 |
|
Φ100 |
Φ60 |
970 |
|
Φ110 |
Φ63.5 |
900 |
|
Φ90 |
Φ61 |
850 |
|
Φ105 |
Φ75 |
1050 |
|
Φ120 |
Φ80 |
930 |
Spoon of die casting material
Aluminum titanate spoon of die casting material is mainly used for transferring aluminum melt. It can withstand high temperature. Depending on its excellent thermal insulation performance and characteristics of non-stick alumina, the product has high cost performance.
Application
used for aluminum die-casting soup feeding machine
Characteristics
- Non-stick aluminum
- No requirement of coating agent
- No impurity in aluminum liquid
- Superior performance to casting iron spoon
Scoop of application
- Die Casting of high-quality aluminum alloy parts
Product Description
- Aluminum titanate spoon of die casting material has a high melting point (1860 ℃ ± 10 ℃), the low coefficient of thermal expansion (at rt-1000 ℃, α＜ two × 10-6 / ℃) and the excellent thermal shock resistance. It can be applied to the extraction of aluminum, magnesium, zinc, copper and other metal liquids.
Product characteristics
- 1.Aluminum inlet of the aluminum titanate scoop is designed as a closed small opening. Compared with the open feeding aluminum water of the traditional scoop, it can effectively block the oxide skin from entering the clean aluminum soup, thus improving the defective rate of die castings.
2.Without maintenance, aluminum titanate scoop does not need to be coated with coating agent.
3.Aluminum titanate scoop has long service life, which is generally 3 to 6 months.
4.Aluminum titanate scoop can avoid the pollution to workplace due to using coating agent.
5.Aluminum titanate scoop can minimize the labor intensity of workers.
6.Aluminum titanate scoop minimize the downtime, due to changing the scoop.
7.Aluminum titanate scoop has excellent insulation effect. Its heat transfer efficiency is 1/15 of casting iron spoon.
Notes
- 1.Service life of aluminum titanate scoop can be prolonged effectively by preheating before using.
2,If there is a small amount of aluminum hanging, please do not knock it. You can remove it by hand after cooling
Advantages
- 1.Excellent thermal shock resistance
2.Non-stick aluminum
3.Excellent corrosion resistance
4.Low coefficient of thermal expansion.
Regular size
- Customized products based on drawings from clients
- Physical and chemical indexes:
Items Parameters Density 3.3-3.5g/cm3 Flexural strength 30-50Mpa Porosity <8% Thermal expansion coefficient 0.5-1.5*10-6℃ Thermal conductivity (800 ℃) 0.86W/m.K
Aluminum silicate sprue cup
-
Aluminum silicate sprue cup is a funnel-shaped external sprue. It can be separately or directly formed in the mold, which will become an enlarged part of the sprue top. Its function is to receive the molten metal from casting ladle in order to prevent splashing and overflow, which is positive to facilitate pouring. In addition, it can also reduce the direct impact of molten metal on the mold. It can also skim off part of the slag and impurities and prevent them from entering the sprue, as well as increasing the hydrostatic pressure of metal.
Aluminum silicate filter tank
- Aluminum silicate filter tank is composed of special ceramic fibers and inorganic ceramic materials. It is a necessary accessory to form a stable filtering chamber, when the workers use foam ceramic filter plate to filter aluminum and aluminum alloy solution. Aluminum silicate filter tank has excellent thermal shock resistance, high strength, strong mechanical strike resistance and low thermal conductivity.
Product application
- Casting occasion of reticulated ceramic foam filtration
Product advantages
- Aluminum silicate filter tank can be used directly at room temperature without worrying about thermal shock.
- Aluminum silicate filter tank has no thermal expansion and low thermal conductivity.
- Aluminum silicate filter tank can float in aluminum, which reduces the possibility of refractory inclusion.
Application method
- 1.Clean the filter tank
2.Gently put the filter plate into the filter box, and press the sealing gasket around the filter plate by hand to prevent the aluminum liquid from flowing by side.
3.Uniformly preheat the filter tank and filter plate to make them close to the temperature of molten aluminum. Preheat to remove moisture, which can facilitate initial instantaneous filtration. Electric or gas heating can be adopted to make preheating. Under normal circumstances, it takes about 15-30 minutes.
4.During casting, please pay attention to the change of aluminum hydraulic head. The normal starting pressure is 100-150mm. When the molten aluminum starts to pass, the pressure head will drop below 75-100mm. Subsequently, the pressure head will gradually increase.
5.During normal filtering, please avoid knocking or vibrating the filter plate. At the same time, the launder shall be filled with molten aluminum to avoid excessive disturbance of molten aluminum.
6.After filtration, please take out the filter plate and clean the filter tank.The standard forming size can provide reliable support for effectively realizing the filtration efficiency of foam ceramic filter plate. In addition to the general specifications, it can be designed and produced according to the clients’ needs.
Aluminum silicate chute
-
Aluminum silicate chute is a kind of excellent high temperature resistant guide chute lining in the process of conveying aluminum and aluminum alloy melt, which can directly contact with the melt. It has excellent thermal insulation performance, thermal shock resistance, and compressive strength. It also can withstand long-term scouring of aluminum melt with collapse. Meanwhile, it is not easy to peel off in application.
Aluminum silicate chute minimizes the secondary pollution of aluminum melt during the conveying process of the guide chute. In this way, its service life is relatively long.
Color: white
Raw material composition: ceramic fiber and inorganic ceramic materials
External dimension: Aluminum silicate chute can be customized based on the required drawings. Its standard dimension tolerance is length ± 2mm and width ± 1mm.
Other properties: Density of Aluminum silicate chute can be adjusted based on customer requirements.
Thermal conductivity: ＜0.12W/m.k when the temperature at 720℃.
Maximum operating temperature: 1250 ℃
Continuous use temperature: 800 ℃
KSINO produces standpipes, floats, ears, gaskets, diverter plates, conduits, and chutes, as well as low-pressure casting Sprue cups which have advantages of erosion resistance, non-stick aluminum, high strength, good insulation and so on. KSINO can design and produce these products with various specifications based on customer requirements.
Aluminum silicate casting nozzle
-
Aluminum silicate casting nozzle is the key part of the aluminum strip continuous casting and rolling mill. Its quality directly affects the strip quality and the production yield.
Aluminum silicate nozzle is a ceramic composite product developed and produced by KSINO. It is scientifically composed of ceramic fibers and inorganic ceramic materials. It has advantages of moderate elasticity, small deformation and long service life. The surface of aluminum silicate nozzle surface is specially treated with aluminum titanate coating. Depending on its special technique, aluminum silicate nozzle can effectively prevent the corrosion of molten aluminum to the casting nozzle and avoid carbonization. Its fine and uniform laminar fiber structure on the fracture part can prevent the existence of flaky flocculent structure. The even and smooth coating on working surface can prevent the occurrence of particle cracks and coating peeling, which guarantee the high quality cast and bound plates. KSINO can customize various types of casting nozzles with different flow modes based on required drawings.
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Density（kg/m3）
Maximum use temperature
Coefficient of expansion （0-1000℃）
Thermal conductivity（900w/m.k）
Shrinkage coefficient（700℃×12h）
Compressive strength
（MPa）
1#
390-430
≥1000℃
2.5×10-6
≤0.12
≤0.5
≥0.10
2#
450-490
≥1200℃
2.1×10-6
≤0.14
≤0.5
≥0.15
-
Item
Common type
High aluminum type
Color
White
Spotlessly white
Working temperature（℃）
1000
1260
Fiber diameter（μm）
2-3
2-3
AL2O3 （%）
44
52-54
AL2O3+SiO2（%）
96
99
Fe3O3（%）
＜1.2
0.2
Na2O+K2O（%）
≤0.5
0.2