Development of Nanocrystalline Wear‐Resistant Y‐TZP Ceramics

Abstract

The present contribution reports some interesting and new results obtained while developing yttria‐stabilized tetragonal zirconia (Y‐TZP) using spark plasma sintering (SPS). The experimental results clearly showed that ZrO2‐nanoceramics with high hardness(∼14.5 GPa) can be processed at a lower sintering temperature of 1200°C in a short time (5 min). Another important result is that the newly developed Y‐TZP nanoceramics, compared with the conventional sintered TZP, exhibit better fretting wear resistance against bearing steel. The intergranular fracture and the grain pullout were observed as the major wear mechanisms of the zirconia nanoceramics.

R-curve behaviour of 2Y-TZP with submicron grain size

“…a better wear resistance. 1 Considerable efforts have recently lead to production of nanocrystalline powders on an industrial scale and a large push for related materials into the marketplace. Before these materials may be used, however, a better understanding of their mechanical properties is required.…”

Densification and properties of transition metal borides-based cermets via spark plasma sintering

“…SPS process is reported to trigger superfast densification of nanomaterials without considerable grain growth. [10][11][12][13] In the present investigation, the densification study on the TiB 2 and ZrB 2 is conducted with the use of the metallic binder addition (Cu) in SPS route. The aim of the present investigation is to illustrate the influence of Cu binder on the densification behavior of two different borides in an electric field assisted sintering process.…”

Effect of Sintering Profiles on the Properties and Ageing Resistance of Y-TZP Ceramic

“…These methods enable the use of rapid sintering rates to produce powders with high density and ultrafine grain structure. These processes, however, are not favourable for most industrial applications simply because of the high production cost, shape complexity and small product size (Basu et al, 2004;Dobedoe et al 2003). It is a general fact that the increase in grain size during presureless sintering depends on the forming method and the firing temperature (Mazaheri et al, 2008).…”