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alumina

alumina

1 8.9
A hard white material used to make ceramics, glass and aluminum
  • noun
  • /əˈluːmɪnə/
  • Specialized
translation icon : alúmina
  • In the process of aluminum extraction, alumina is first produced from bauxite ore.
  • alumina ceramic
  • alumina abutments
  • alumina substrates

Examples

  • The unavoidable electric resistance within each cell produces sufficient heat to keep the cryolite-alumina mixture molten.

    Blog text (18)
  • An alumina-based abrasive coating on the blade tips reduces leakage losses by maintaining minimum clearances.

    Academic text (1994)
  • The original head consisted of widely used alumina ceramic.

    Academic text (2004)
  • We work with all aluminas and many other specialty materials.

    Academic text (1997)
  • Fisher has refined the joint head, using a ceramic of alumina and a small amount of zirconia, which he said gives greater fracture toughness.

    Academic text (2004)
  • The base substrate is alumina ceramic with multiple levels of coiled molybdenum wiring.

    Academic text (1998)
  • Nearly pure alumina, unlike graphite or titanium, is a relatively inexpensive material that can be fabricated reliably.

    Academic text (1993)
  • Stryker Orthopaedics claims that alumina-on-alumina ceramic bearings of its Trident Ceramic hip system (top right) wear less than other materials.

    Academic text (2004)
  • Alumina is a key ingredient in the production of high-quality alumina ceramics used in various industries.

  • The laboratory tested the hardness of the alumina sample to determine its suitability for glassmaking.

Synonyms

corundum
vsalumina
  • Specialized
1 9.9

A very hard mineral used to make rubies, sapphires and things like sandpaper

is the compound in general rather than only the gem or abrasive crystal form
aluminum oxide
vsalumina
  • Specialized
1 5.0

A hard white material made from aluminum and oxygen used for tools and coatings

is the alternative name commonly used in manufacturing ceramics and glass

Surface Forms

alumina singular
aluminas plural

Morphology

alumina = alum (semi-transparent) = alum + ina

Formally built from 'alum' + the chemical-forming suffix '-ina', but the specific technical meaning 'aluminium oxide' is specialized and not directly deducible by a general learner.

Etymology

Alumina comes from the old word alum, which meant 'bitter salt', plus the ending -ina that marks a substance. So alumina is the white, hard substance related to the metal aluminum, which is why it is used in ceramics, glass, and in making aluminum.