Refractory

This article is about heat resistance. For other uses, see Refractory (disambiguation).
Refractory bricks in a torpedo car used for hauling molten iron

In materials science, a refractory (or refractory material) is a material that is resistant to decomposition by heat or chemical attack and that retains its strength and rigidity at high temperatures.[1] They are inorganic, non-metallic compounds that may be porous or non-porous, and their crystallinity varies widely: they may be crystalline, polycrystalline, amorphous, or composite. They are typically composed of oxides, carbides or nitrides of the following elements: silicon, aluminium, magnesium, calcium, boron, chromium and zirconium.[2] Many refractories are ceramics, but some such as graphite are not, and some ceramics such as clay pottery are not considered refractory. Refractories are distinguished from the refractory metals, which are elemental metals and their alloys that have high melting temperatures.

Refractories are defined by ASTM C71 as "non-metallic materials having those chemical and physical properties that make them applicable for structures, or as components of systems, that are exposed to environments above 1,000 °F (811 K; 538 °C)".[3] Refractory materials are used in furnaces, kilns, incinerators, and reactors. Refractories are also used to make crucibles and molds for casting glass and metals. The iron and steel industry and metal casting sectors use approximately 70% of all refractories produced.[4]

  1. ^ Ailsa Allaby and Michael Allaby (1996). Concise Dictionary of Earth Sciences. Oxford Paperbacks Oxford University Press.
  2. ^ "Refractories and Classification of Refractories". IspatGuru. Retrieved 6 March 2020.
  3. ^ ASTM Volume 15.01 Refractories; Activated Carbon, Advanced Ceramics
  4. ^ "How cool are refractory materials?" (PDF). The Journal of the Southern African Institute of Mining and Metallurgy. 106 (September): 1–16. 2008. Retrieved 22 April 2016.