Zirconia

Zirconia

Zirconia, ZrO2, is a ceramic with an exceptionally high melting point -- 2760 C when pure. It has the highest useful strength and toughness at room temperature of all the readily available ceramics. It is used (with 5% CaO) as a firebrick, and, in sintered form (with MgO or Y2O3 additives) for high strength, high temperature applications. The exceptional toughness is imparted by transformation toughening - a change in crystal structure from tetragonal to monoclinic, with an associated change in volume of the ZrO2 crystals when subjected to stress at a crack tip. The volume expansion squeezes the crack shut, impeding crack growth. Transformation toughening is made possible by additions of magnesia, MgO, or yttria, Y2O3, to give PSZ (partially stabilized zirconia) or TZP (tetragonal zirconia polycrystal). Zirconia is also available as foam for thermal insulation and filtration, and as fibers, used to make fabrics that can tolerate temperatures up to 2425 C.

Source:
"Zirconia", Granta CES Edupack 2018, accessed June 2020

General Applications: Bearing wear sleeves; microtools and tweezers; knife blades; replacement for steel in surgical applications; electrical and thermal insulation at high and low temperatures; cutting applications; extrusion and drawing dies; catalyst supports; cylinder liners; turbo-charger blades and other engine components for automotive applications; wear plates, thermal barrier coatings for turbine blades.

Related Processes: Flexible Adhesives|Threaded Fasteners|Brazing|Laser powder forming|Selective laser sintering, metals and ceramics|Extrusion|Drilling|Grinding|Abrasive jet machining and cutting|Laser cutting|Tape casting|Hot isostatic pressing|Cubic printing|Organic solvent-based painting|Vitreous enameling|Water-based painting|Grinding and mechanical polishing|Texturing|Vapor metallizing (PVD)

Related Products: Peeler (Ceramic Blade, Kyocera)

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Record number: 1021