Magnesia crucible

Overview of Magnesia crucibles

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 oxide. Yttrium Oxide is completely inert and behaves similarly to MgO in all applications.

Magnesia crucibleshave 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 2,000˚C.

MgO Magnesia crucibles possess relatively good mechanical strength but are sensitive to thermal shock. Uniform heating and cooling conditions are necessary to prevent thermal shock-related damage. Maximum heating and cooling rates of 200 °C per hour are recommended, and thermal gradients should be avoided. When used at temperatures exceeding approximately 1,200 °C, limitations in creep resistance should also be considered.

Chemical analysis of Magnesia crucibles

• MgO + Y2O3 99.38 %
• CaO 0.38 %
• SiO2 0.4 %
• Al2O3 0.03 %
• Fe2O3 0.07 %
• B2O3 0.01 %

Benefits of Magnesia crucibles

Magnesia crucibles offer several advantages:

• Better chemical resistance than alumina in certain applications
• Proven alternative to alumina in slag testing
• Operating temperatures exceeding 2,200 °C in specific environments
  

Applications of Magnesia crucibles 

They are used in various fields, including glass industry and metallurgy.

• Processing of molten metal alloys
• Viable alternative to alumina-based ceramics (Al2O3)
• Compatibility with nickel-based alloys
• Proven performance in plutonium and uranium refining
• High-temperature ceramic superconducting materials
• Compatibility with perovskite structure
• Processing of piezoelectric materials
• Resistant to lead-based materials

Technical data of Magnesia crucibles

Side thickness of 2.5 to 4 mm depending on the crucible diameter.