Silicon Carbide Graphite Crucible

Silicon Carbide Graphite Crucible

1. Core performance of silicon carbide (SiC)

High hardness and high mechanical strength: silicon carbide has a Mohs hardness of 9.5, second only to diamond, showing excellent wear resistance and impact resistance.

Excellent thermal conductivity and high temperature resistance: thermal conductivity up to 120-200 W/(m·K), can quickly and evenly conduct heat. Our crucible can work stably for a long time in the high temperature environment from **1600°C to 2000°C.

Oxidation resistance and chemical resistance: silicon carbide at high temperature to form a dense SiO2 protective layer, effectively prevent oxidation. It is suitable for harsh working conditions such as molten metal and corrosive slag.

2. Characteristics and functions of graphite

High conductivity and thermal conductivity: graphite has high thermal conductivity, which promotes rapid heat conduction and improves smelting efficiency.

Good thermal shock resistance: low thermal expansion coefficient, adapt to drastic temperature changes, reduce the risk of cracking.

3. Composite advantage of silicon carbide and graphite

Material synergy: The composite structure of silicon carbide and graphite has both high strength and high thermal conductivity.

Extended service life: high temperature resistance, oxidation resistance and wear resistance greatly extend the service life of the crucible.

4. Key performance parameters

Thermal expansion coefficient: low thermal expansion, good thermal stability.

Oxidation resistance index: maintain stable structure under high temperature conditions.

Thermal conductivity and thermal shock stability: improve the efficiency of smelting process, adapt to complex temperature conditions.

Silicon Carbide Graphite Crucible Uses

Metallurgical industry: used in the smelting process of aluminum, copper, magnesium and other non-ferrous metals, with high thermal conductivity efficiency and good structural stability.

Foundry industry: Ensure high-precision casting manufacturing, reduce energy loss during smelting, and improve production efficiency.

Semiconductor industry: it shows high purity and temperature stability in the smelting and crystal drawing of monocrystal silicon and polycrystalline silicon.

Importance:

The application of silicon carbide graphite crucible improves the industrial production efficiency, reduces the production cost, promotes the technological innovation and industrial development, especially plays an irreplaceable role in the high temperature material preparation and new energy industry.

Metal Foundries’ Advantages

High temperature stability and excellent thermal conductivity: efficient and uniform heat conduction, maintain stability in high temperature environment.

Long service life, high economy: reduce maintenance costs, improve the overall economic benefits.

Oxidation resistance, corrosion resistance and high mechanical strength: suitable for harsh working conditions, prolong the service life of the crucible.

Preparation process of silicon carbide graphite crucibles

Selection and handling of raw materials

High purity silicon carbide powder and natural/artificial graphite are selected.

Control particle size distribution and material ratio to optimize performance parameters.

Process of forming

Isostatic pressing molding: ensure uniform density of crucible and high molding accuracy.

Molding: suitable for large-scale production, low process cost.

Sintering and densification process

Atmosphere sintering and reaction sintering: increase the density and structural strength of the crucible.

Hot isostatic pressing (HIP) : further optimize mechanical properties and densibility.

Surface oxidation resistant coating technology

Coating materials such as silicon oxide (SiO2) are selected to form a protective layer.

Improve the oxidation resistance and service life of crucible.

Quality control and performance testing

Mechanical strength, thermal conductivity and oxidation resistance were tested.

The service life and thermal shock resistance are tested by simulating the actual working conditions.