Relationship between mechanical properties and microstructure of yttria stabilized zirconia ceramics densified by spark plasma sintering

The efficiency of using the collector pressing scheme in the Spark Plasma Sintering (SPS) process has been confirmed in improving the optical, physical, and mechanical properties of yttria-stabilized zirconia (YSZ) ceramics with an increased shape factor. An approach for developing a seal surface and determining the optimal method of increasing pressure and temperature during SPS on this surface was used to optimize the consolidation modes of the materials. It has been shown that transparent/translucent YSZ ceramics with an increased shape factor (14 mm in diameter and up to 5 mm in height, h/d = 0.36) can be successfully fabricated by the SPS technique combined with the collector pressing scheme. The optical properties and microhardness of ceramics obtained using the collector scheme are better to the optical properties of ceramics obtained using the conventional uniaxial pressing scheme.

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In-situ high temperature micromechanical testing of ultrafine grained yttria-stabilized zirconia processed by spark plasma sintering

Acta Materialia ◽

10.1016/j.actamat.2018.05.062 ◽

2018 ◽

Vol 155 ◽

pp. 128-137 ◽

Cited By ~ 8

Author(s):

Jaehun Cho ◽

Jin Li ◽

Q. Li ◽

Jie Ding ◽

Han Wang ◽

...

Keyword(s):

High Temperature ◽

Spark Plasma Sintering ◽

Yttria Stabilized Zirconia ◽

Stabilized Zirconia ◽

Micromechanical Testing ◽

Plasma Sintering ◽

Ultrafine Grained ◽

Spark Plasma

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Spark Plasma Sintering of Yttria-Stabilized Zirconia/Titanium Nitride Composites

MRS Proceedings ◽

10.1557/opl.2015.155 ◽

2015 ◽

Vol 1735 ◽

Author(s):

Paulo S. M. Silva ◽

Fabio C. Fonseca

Keyword(s):

Titanium Nitride ◽

Spark Plasma Sintering ◽

Yttria Stabilized Zirconia ◽

X Rays ◽

Stabilized Zirconia ◽

Electrical Measurements ◽

Mechanical Mixing ◽

Metallic Behavior ◽

Plasma Sintering ◽

Spark Plasma

ABSTRACTComposites of 8 mol% yttria-stabilized zirconia (YSZ) and titanium nitride (TiN) were obtained by mechanical mixing of commercial powders. High-density samples of (1-x) YSZ / x TiN, with x = 0, 25, 50, and 75 wt.%, were obtained by spark plasma sintering (SPS) at 1450 °C for 5 min. Surface contamination with carbon from the SPS was eliminated by diamond sawing of parallel surfaces. X-rays diffraction analyses showed that samples are composed by a mixture of the initial phases, without appreciable reaction as inferred from calculated lattice parameters. dc 4-probe electrical measurements in the 100-850°C under showed that samples have a metallic behavior, indicating that the percolation threshold was attained for the sample with the lowest content of the TiN (x=25 wt.%), which corresponds to ∼27 vol.%.

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Overcoming the effect of contaminant in solid oxide fuel cell (SOFC) electrolyte: spark plasma sintering (SPS) of 0.5wt.% silica-doped yttria-stabilized zirconia (YSZ)

Materials Science and Engineering A ◽

10.1016/j.msea.2003.12.028 ◽

2004 ◽

Vol 374 (1-2) ◽

pp. 64-71 ◽

Cited By ~ 29

Author(s):

X.J Chen ◽

K.A Khor ◽

S.H Chan ◽

L.G Yu

Keyword(s):

Fuel Cell ◽

Solid Oxide Fuel Cell ◽

Spark Plasma Sintering ◽

Solid Oxide ◽

Yttria Stabilized Zirconia ◽

Oxide Fuel ◽

Stabilized Zirconia ◽

Plasma Sintering ◽

Spark Plasma

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Effect of Alumina Additions on Mechanical and Electrical Properties of 8mol% Yttria-Stabilized Zirconia Prepared by Spark Plasma Sintering

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.317-318.917 ◽

2006 ◽

Vol 317-318 ◽

pp. 917-920

Author(s):

Jae Kwang Kim ◽

Kyung Hun Kim ◽

Yong Ho Choa ◽

Jong Won Yoon ◽

Kwang Bo Shim

Keyword(s):

Electrical Conductivity ◽

Grain Size ◽

Relative Density ◽

Spark Plasma Sintering ◽

Average Particle Size ◽

Yttria Stabilized Zirconia ◽

Average Particle ◽

Stabilized Zirconia ◽

Plasma Sintering ◽

Spark Plasma

Dense 8mol% yttria-stabilized zirconia (8YSZ) consisting of submicrometer-sized grains was prepared using spark plasma sintering (SPS) along with Al2O3 additives. The starting powder with average particle size of 50nm was densified to 98% of the relative density with short sintering time (5min) at 1200 while preserving a submicrometer grain size. The fracture toughness and bending strength showed maximum values of 2.54MPam1/2 and 380MPa at 2vol% alumina-added 8YSZ, due mainly to the higher relative density and small grain size. The electrical conductivity of 2vol% alumina-added 8YSZ was 0.0278 S/cm at 700 in airThus, alumina additions in 8YSZ using the SPS method are an effective process to improve the mechanical strength and electrical conductivity.

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