Production and Characterization of Ceramic Bushings from Alumina-Toughened Yttrium-Stabilized Tetragonal Zirconia Composites for Projection Welding Applications

The citrate gel method, similar to the polymerized complex method, was used to synthesize homogenous tetragonal zirconia at 800oC and 1000oC. Nanocrystalline tetragonal single phase has been fully stabilized with 3, 7, 10 mol% CaO and 10, 15 mol% MgO at 800oC, respectively. In addition, the XRD analysis showed the absence of monoclinic phase after addition of 7 and 10 mol% CaO into zirconia-based solid solutions, which have been fully stabilized both 800oC and 1000oC. The crystallite sizes of the t-ZrO2 with 3, 7 and 10 mol% CaO at 1000oC were 32, 28 and 29nm, respectively. For ZrO2- x mol% MgO (x=3, 10, 15) solid solution, the crystallite sizes of samples at 800oC were less than 29nm, however it was increased up to 69nm at 1000oC. The prepared gel and subsequent heat-treated powders were characterized by X-ray diffraction (XRD), Raman spectroscopy and transmission electron microscopy (TEM) to get detail information regarding to differentiation of polymorphs of zirconia as well as formation of powders.

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Multigram Scale Synthesis and Characterization of Monodisperse Tetragonal Zirconia Nanocrystals

Journal of the American Chemical Society ◽

10.1021/ja034258b ◽

2003 ◽

Vol 125 (21) ◽

pp. 6553-6557 ◽

Cited By ~ 281

Author(s):

Jin Joo ◽

Taekyung Yu ◽

Young Woon Kim ◽

Hyun Min Park ◽

Fanxin Wu ◽

...

Keyword(s):

Tetragonal Zirconia ◽

Synthesis And Characterization

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Preparation and characterization of mullite-zirconia composites from various starting materials

Journal of the European Ceramic Society ◽

10.1016/0955-2219(94)90066-3 ◽

1994 ◽

Vol 14 (4) ◽

pp. 295-302 ◽

Cited By ~ 10

Author(s):

Toshiyuki Koyama ◽

Shigeo Hayashi ◽

Atsuo Yasumori ◽

Kiyoshi Okada

Keyword(s):

Zirconia Composites

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Properties and rapid sintering of a nanostructured tetragonal zirconia composites

Metals and Materials International ◽

10.1007/s12540-017-7069-y ◽

2017 ◽

Vol 23 (5) ◽

pp. 940-947 ◽

Cited By ~ 4

Author(s):

In-Jin Shon ◽

Jin-Kook Yoon ◽

Kyung-Tae Hong

Keyword(s):

Tetragonal Zirconia ◽

Zirconia Composites ◽

Rapid Sintering

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Characterization of Intergranular Phases in Doped Zirconia Polycrystals

MRS Proceedings ◽

10.1557/proc-589-383 ◽

1999 ◽

Vol 589 ◽

Author(s):

N. D. Evans ◽

P. H. Imamura ◽

J. Bentley ◽

M. L. Mecartney

Keyword(s):

Grain Boundary ◽

Grain Boundaries ◽

Analytical Electron Microscopy ◽

Tetragonal Zirconia ◽

Barium Ions ◽

Analytical Electron ◽

Scanning Transmission ◽

Triple Points ◽

Boundary Chemistry

AbstractAnalytical electron microscopy at high spatial resolution in a scanning-transmission mode has been used to investigate the effects of glassy or crystalline material additions on grain boundary chemistry in yttria-stabilized zirconia polycrystals. Powders of additive phase were mixed into 3-mol% yttria-stabilized tetragonal zirconia polycrystals (‘3Y-TZP’) or 8-mol% yttria-stabilized cubic zirconia polycrystals (‘8Y-CSZ’). Zirconias processed without additive phases were also examinedWithout additives, grain boundaries were depleted in zirconium and enriched in yttrium. In 3Y-TZP with I wt% borosilicate glass, silicon was observed only at triple points, but not in grain boundaries. In 3Y-TZP with 1 wt% barium silicate glass, barium was observed both along grain boundaries and at triple points, whereas silicon was detected only within the triple points. This suggests either the composition of the additive phase at the grain boundary is different from that at the triple points, or that barium ions segregate to grain boundaries during processing. In 8Y-CSZ with I wt% silica, silicon was observed in grain boundaries by an EDS spatial differencing technique. In 8Y-CSZ with 10 wt% alumina, EDS revealed aluminum at all grain boundaries examined

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