Crucibles

Final Advanced Materials offer a range of crucibles suitable for calcinating and melting various alloys.

The main quality of a crucible is its ability to withstand temperatures above the melting temperatures of the alloys deposited by metallurgists without altering or polluting the molten metal. In some cases, when a crucible is brought to these very high temperatures, it must be strong enough to withstand being moved for the casting of parts (bronze foundry for example).

Our team is available to help you choose the crucible and the material that best meet your requirements.

Materials available

• 99.7% Sintered alumina
• Sintered vitreous carbon
• Magnesium Oxide (MgO)
• Porous zirconia
• Specific developments
• Isostatic pressing

Please do not hesitate to contact us and send us your specifications so that we can help determine which product will best meet your requirements.

99.7% sintered alumina

Sintered alumina enables use up to 1700°C. This product is ideal for very high temperature applications.

It is resistant to chemical attacks from most acids and alkaline solutions as well as hydrogen and other reducing gases, with the exception of :

• High concentration hydrofluoric acid
• Phosphoric acid at boiling point
• Potassium hydroxide solution at boiling point
• Sodium hydroxide solution
• Alkali salt melt

Vitreous carbon

Vitreous carbon is resistant to very high temperatures up to 3000°C in inert gas. Unlike many high temperature products, vitreous carbon increases in strength, peaking at 2400°C. It is twice as resistant at 2400°C than at room temperature. There is no weakening of the product at high temperatures and resistance to thermal shock is very high. Temperature increases followed by repeated cooling pose no problem.

Magnesium oxide MgO

Magnesium Oxide MgO crucibles have a fine-grained structure with low open porosity. The density is 3.45 g/cm3 with less than 1% open porosity.

This material contains 2% Yttrium Oxide (Y2O3) to facilitate the sintering of Magnesium. Yttrium Oxide is completely inert and behaves similarly to MgO in all applications.

Magnesia crucibles have a mechanical strength and thermal shock resistance lower than those of Alumina crucibles. They require heating and cooling to be as homogeneous as possible.

They resist up to around 2000˚C.

Porous zirconia

Partly (magnesia) stabilised zirconium oxide obtained by isostatic pressing, ideal for use up to 1800˚C.

Advantages

• Can be used up to 1800°C
• Very good resistance to thermal shock
• Erosion resistant
• Very low thermal expansion
• Resistant to wetness from molten metals

Specific developments : silicone carbide

In addition to our standard items, we also offer tailor-made items developed according to your requirements. You can select the material from our range and entrust us with creating your crucibles.

Some of our developments

• Silicon carbide crucible ext. diameter 24 mm - int. diameter 20 mm - H 40 mm
• Zirconium oxide crucible ext. diameter 6 mm - int. diameter 4 mm - H 10 mm

Crucibles made by isostatic pressing

Final Advanced Materials offers a range of melting crucibles that are made by isostatic pressing. For non-ferrous metals only.

Compatible metals

• Brass
• Aluminium
• Zinc
• Precious metals

Dimensions

• Crucibles from 30 g to 5 tons
• Height of 29 to 1600 mm
• Maximum diameter 950 mm

Crucibles and accessories of various shapes and sizes available on request, in all qualities. Just send us your design or specific dimensions.

Contact us