Yttria stabilised zirconia coating

EB-PVD partially yttria stabilised zirconia coatings offer a very promising concept to reduce service temperatures on y-TiAl components. 

Yttria-partially stabilised zirconia coatings were manufactured by SPS of submicrometre-sized particles (50 and 400 nm) with several sets of spray operating parameters (Bacciochini et al., 2010). The average void size was comparable to the solid precursor structure showing nanometre-size scale with multimodal size... 

A supersaturated bioinspired solution was used to coat alumina and zirconia substrates with a thin, poorly crystalline layer of OCP that after heat treatment at 1050 °C for 1 h was converted to hydroxyapatite with particle size of 300 nm (Pribosic, Beranic-Klopcic and Kosmac, 2010). Stefanic et al. (2012) applied a related method to rapidly deposit an OCP layer by a two-step process onto yttria-stabilised tetragonal zirconia polycrystal (Y-TZP). 80vol% Mg-PSZ/20 vol% alumina substrates were used by Nogiwa and Cortes (2006) to deposit biomimetically by immersion in 1.4 SBF a bone-like apatite coating of 15-30 pm thickness, using a bed of either wollastonite ceramics or bioactive glass as an additional source of Ca2+ ions. 

---