Browse & Explore

Search & Select

Crystalline Ceramics:

Refractory Ceramics

Category Summary

Refractories are materials of construction that can withstand high temperatures and maintain their physical properties within a furnace environment. They are therefore widely used to build structures that can resist the thermal shock, physical wear and corrosive chemicals associated with iron and steel production, copper and aluminium smelting, glass and ceramics production and similar processes. Refractories can be used for kiln linings, fire radiants, incinerators or crucibles, reactorsand other equipment in chemical processes.

Two thirds of all refractories used by the industry are preformed bricks and other fired shapes. The mechanical properties are strongly dependent on their surfaces and the presence of defects resulting from their finishing and handling. Production of ceramic articles start with fine powder which is given shape by various casting and pressing methods prior to sintering at approximately 0.7 of the melting temperature.

Category Details

Features

Refractories are especially fit for applications in unfriendly environments, where they are subject to high temperatures or abbrasive substances.

  • High temperature resistant
  • High corrosion resistance
  • Very good resistance to acidic or caustic environments
  • Heat shock resistant
  • Fine compressive strength

But keep in mind that refractories in general:

  • Are brittle
  • Have a low resistance to tensional stress
  • Have a low resistance to flexurial stress
  • Limited processing options

Classification

Refractories are crystalline ceramics with very high resistance to high temperatures, corropsion and abbrasive environments. Examples of refractories are:

  • Chamotte, also known asfiresan, fire-clay or grog
  • Magnesia or magnesium oxide (MgO)
  • Mullite or porcelainite

Classification Sources

Idemat 2003

Wikipedia

Health

Known health effects for this category.

Toxicity

No relevant data available on this level.

Environment

Known environmental effects for this category.

No relevant data available on this level.