Ceramic Zirconium Alloy Services

Ceramic Zirconium Alloy Services

Ceramic zirconium alloys have a very low absorption cross-section of thermal neutrons. It provides high hardness, ductility, and corrosion resistance.

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Ceramic Zirconium Alloys at 3Diligent ProdEX

Ceramic zirconium alloys have a very low absorption cross-section of thermal neutrons. It provides high hardness, ductility, and corrosion resistance.

Yttria-stabilized zirconia (YSZ) is a ceramic zirconium subdivision in which the cubic crystal structure of zirconium dioxide is made stable at room temperature by an addition of yttrium oxide. These oxides are commonly called “zirconia” (ZrO2) and “yttria” (Y2O3), hence the name.

Zirconium dioxide is one of the most studied ceramic materials. ZrO2 adopts a monoclinic crystal structure at room temperature and transitions to tetragonal and cubic at higher temperatures. The change of volume caused by the structure transitions from tetragonal to monoclinic to cubic induces large stresses, causing it to crack upon cooling from high temperatures. When the zirconia is blended with some other oxides, the tetragonal and/or cubic phases are stabilized. Effective dopants include magnesium oxide (MgO), yttrium oxide (Y2O3, yttria), calcium oxide (CaO), and cerium(III) oxide (Ce2O3). Zirconia is often more useful in its phase ‘stabilized’ state. Upon heating, zirconia undergoes disruptive phase changes. By adding small percentages of yttria, these phase changes are eliminated, and the resulting material has superior thermal, mechanical, and electrical properties. In some cases, the tetragonal phase can be metastable. If sufficient quantities of the metastable tetragonal phase is present, then an applied stress, magnified by the stress concentration at a crack tip, can cause the tetragonal phase to convert to monoclinic, with the associated volume expansion. This phase transformation can then put the crack into compression, retarding its growth, and enhancing the fracture toughness. This mechanism is known as transformation toughening, and significantly extends the reliability and lifetime of products made with stabilized zirconia.

Check out our 3Depot Material and Technology database to find the specific type of ceramic zirconium alloy you need.

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