Graphite Crucible

Graphite crucibles are refractory containers made from graphite that are designed to withstand extremely high temperatures and aggressive chemical environments. They are primarily used for melting, holding, and processing a wide variety of materials, including metals, alloys, and glass. The unique combination of properties offered by graphite makes it an ideal material for these demanding applications.

Why does graphite matieral suitable for smelting and casting for jewelry industry and other industry? 

The crucible is made from high quality graphite which makes the graphite crucible to have a good thermal conductivity, resistant to acidity and alkalinity and a high temperature resistance, therefore, ensuring quality of products.

Graphite crucibles do not contaminate molten metals because the graphite material is fused and does not loosen. The quality of a graphite crucible is determined by how it is manufactured, which influences its structure, density, porosity, and strength.

As the graphite has an excellent heat performance, the time spent on melting is short, therefore saving energy.Their excellent heat performance helps in melting metals quickly for faster production cycles.

Since graphite crucibles are resistant to chemicals and corrosion, they are not affected by workshop conditions, characteristics that make them durable and long lasting.

So graphite crucible is suitable for foundries, jewelry industry and other industries where metal melting and casting is necessary.

Types of Graphite Used for Crucibles:

Different types of graphite are used in crucible manufacturing, depending on the specific application requirements:

Clay-Graphite Crucibles: These crucibles contain a mixture of graphite and clay. They are relatively inexpensive and suitable for melting non-ferrous metals and alloys at moderate temperatures.

Carbon-Bonded Graphite Crucibles: These crucibles are made from graphite particles bonded together with carbon. They offer higher temperature resistance and strength than clay-graphite crucibles and are suitable for melting ferrous metals and alloys.

Isostatic Graphite Crucibles: These crucibles are made from isostatically pressed graphite, which provides uniform density and strength throughout the crucible. They are highly resistant to thermal shock and erosion and are suitable for demanding applications.

Silicon Carbide Coated Graphite Crucibles: These crucibles are made from graphite coated with silicon carbide. The silicon carbide coating provides excellent oxidation resistance and extends the crucible's lifespan at high temperatures.

Key Features of Graphite Crucibles:

Shape and Size: Graphite crucibles are available in a wide range of shapes and sizes to accommodate different melt volumes and furnace designs. Common shapes include cylindrical, conical, and bowl-shaped.

Wall Thickness: The wall thickness of the crucible is determined by the material being melted, the maximum temperature, and the handling requirements. Thicker walls provide greater strength and durability.

Lid (Optional): Some crucibles are equipped with lids to prevent oxidation and minimize heat loss during melting and holding.

Spout (Optional): Many crucibles have a pouring spout to facilitate controlled pouring of the molten material.

Handle or Lip: Crucibles often have a handle or lip for safe and easy handling.

Purity: High-purity graphite crucibles are used for applications where contamination of the melt must be minimized.