Melting crucible

 Here are some key performance data for silicon carbide crucibles:

Melting point: 2700℃

Density: 3.21 g/cm3

Bending strength: 400-600 MPa

Thermal conductivity: 120W/m·K

Thermal expansion coefficient: 4.0×10⁻⁶/℃ (in the range of 20-1000℃)

Hardness: 9.2 (Mohs hardness)

Wear resistance: wear amount 0.005-0.01 mm³/N·m (during friction test)

These properties allow silicon carbide crucibles to maintain structural integrity and resist deformation or fracture in extremely high temperature environments.

Carbonized silicon carbide crucible and its manufacturing process

Carbonized silicon carbide crucible is an improved version of silicon carbide crucible, specifically solving the problems of ordinary crucibles such as low strength, poor thermal shock resistance, and short service life.  Carbonized silicon carbide crucible is composed of carbon fiber and silicon carbide composite materials and is manufactured through the following process:

1. Preform: Preprocess carbon fiber to form a preform.

2. Carbonization: radially carbonize the preform to initially form a silicon carbide structure.

3. Densification: Through further carbonization, the density of the crucible material is increased and its strength is enhanced.

4. Purification: Purify the materials at high temperature to remove impurities and improve chemical stability.

5. Siliconing: Dip the crucible material into molten silicon to enhance its strength and corrosion resistance.

6. Carbonization: Carry out high-temperature carbonization again to ensure the stability of the internal structure of the material.

7. Shaping: Finally the material is shaped into the desired crucible shape.

Through this process, carbonized silicon carbide crucibles significantly reduce the thickness of the crucible, increase its strength and thermal shock resistance, and extend its service life.

 Thickness reduction: The crucible thickness is reduced by 30% to improve thermal conductivity.

 Increased strength: Strength increased by 50%, able to withstand higher mechanical stress.

 Thermal shock resistance: Thermal shock resistance is increased by 40%, and cracks are less likely to occur during rapid heating and cooling.

 Service life: The service life is doubled, significantly reducing replacement frequency and production costs.

Advantages and Performance

 High temperature strength:

Silicon carbide crucibles can remain stable at temperatures up to 1700°C, far exceeding the melting point of aluminum at 660.37°C.  This high-temperature strength ensures that the crucible will not be deformed or damaged during long-term high-temperature melting.

 Corrosion resistance:

Silicon carbide has excellent corrosion resistance and can resist corrosion from metals such as molten aluminum.  This feature extends the service life of the crucible and reduces replacement frequency and production costs.

 Chemically inert:

Under high temperature conditions, silicon carbide does not react with aluminum and its alloys, ensuring the purity of the molten metal.  The chemical inertness of silicon carbide crucibles helps maintain the chemical stability of the metal and avoid contamination by impurities.

 Excellent thermal conductivity:

Silicon carbide has a high thermal conductivity of 120 W/m·K, enabling fast and uniform heat transfer.  This function improves smelting efficiency, reduces smelting time, and improves production efficiency.

 Thermal shock resistance:

Silicon carbide crucibles have excellent thermal shock resistance and can withstand severe temperature changes without cracking.  This feature is particularly important during rapid heating and cooling processes, ensuring safe use of the crucible.

 Mechanical strength:

Silicon carbide crucibles have extremely high mechanical strength with a flexural strength of 400-600 MPa, allowing them to withstand heavy loads and high-pressure conditions.

Application areas：

Silicon carbide crucibles are widely used in the smelting and casting processes of aluminum and its alloys, especially in the following fields:

Aluminum smelting plant: used for melting and purifying aluminum ingots to ensure high purity of aluminum products.

Improve production efficiency: Using silicon carbide crucible can reduce melting time by 20% and reduce energy consumption at the same time.

Aluminum alloy foundry: During the casting process of aluminum alloy parts, silicon carbide crucible provides a stable high-temperature environment and improves product quality.

Quality control: Using silicon carbide crucible, the scrap rate of aluminum alloy castings can be reduced by 30%.

Laboratories and research institutions: Used for high-temperature experiments and metal materials research. The chemical inertness and high-temperature performance of silicon carbide crucibles ensure the reliability of experimental results.

Data accuracy: The stability of silicon carbide crucibles at high temperatures increases the accuracy of experimental data by 15%.