Direct coagulation casting of yttria-stabilized zirconia using magnesium citrate and glycerol diacetate

Xu, Jie; Gan, Ke; Yang, Minghao; Qu, Yanan; Wu, Jia‐Min; Yang, Jinlong

doi:10.1016/j.ceramint.2014.12.163

Cited by 27 publications

(8 citation statements)

References 35 publications

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“…Nevertheless, the compressive strength of green body prepared was 3.01~3.60 MPa. It is higher than the strength of green bodies prepared by other DCC methods but much lower than the samples prepared by gelcasting . The high strength of green body in gelcasting process is mainly due to the high content of organics.…”

Section: Introductionmentioning

confidence: 76%

In situ coagulation of yttria‐stabilized zirconia ceramic with enhancement of green body via polyvinyl pyrrolidone crosslink

Gan

et al. 2020

J of Applied Polymer Sci

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In situ coagulation for yttria-stabilized zirconia (YSZ) suspension via polyvinyl pyrrolidone (PVP) crosslink is reported. PVP is used to prepare sterically stabilized YSZ suspension. Influence of PVP on the dispersion of YSZ suspension was investigated. It indicates that well disperse YSZ suspension with 0.3 wt % PVP can be prepared. Dimethyl sulfate (DMS) was added at 40 C to coagulate the suspension after degassing. Influence of DMS content and coagulation temperature on coagulation process and properties of green bodies were investigated. It indicates that sufficiently high viscosity to coagulate the suspension is achieved with the addition of 1 vol % DMS at 60~80 C. The coagulation mechanism is proposed that the YSZ suspension is destabilized by the self-crosslink of PVP. Coagulated samples with the highest wet compressive strength of 6.34 MPa could be demolded without deformation by treating 50 vol % YSZ suspension at 60 C. Dense YSZ ceramics with relative density above 99.1% and flexural strength of 920 AE 90 MPa had been prepared by this method sintered at 1450 C for 3 h.

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Section: Introductionmentioning

confidence: 76%

In situ coagulation of yttria‐stabilized zirconia ceramic with enhancement of green body via polyvinyl pyrrolidone crosslink

Gan

et al. 2020

J of Applied Polymer Sci

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“…We assessed the stability of YSZ dispersions in the presence of different amounts of polymers through zeta potential measurements (Figure 1a). The neat YSZ suspension showed a zeta potential value (ζ) of +33 mV at pH ∼ 5.6, 26 indicating a stable colloidal dispersion. Upon the addition of AMPScontaining polymers, the surface potential of YSZ particles decreased compared to AA100, VPA100, and VPA50.…”

Section: Electrokinetic Study and Stabilitymentioning

confidence: 99%

Polymer Bridging Induced by a Single Additive Imparts Easy-To-Implement Green Machinability to Yttria-Stabilized Zirconia

Zemberekci

Demir

Akaoğlu

et al. 2021

ACS Appl. Polym. Mater.

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Cold isostatic pressing, gelcasting, and protein coagulation are the main methods to produce machinable green bodies of ceramics. They generally employ multiple additives, such as binders, dispersants, and coagulants, and require numerous steps to embody a green body that can withstand further shaping and machining. This study reports a method that forms a ceramic dough that can be manipulated by hand, cut, or pushed into a mold. This facile method relies on a single additivea linear copolymerto homogeneously coagulate yttria-stabilized zirconia through polymer bridging. The structure of the additive is systematically designed, and the amount to be used in the formulations is optimized through electrokinetic and rheological studies. The use of this additive at 1 wt % generates ceramic objects with ∼22% shrinkage and a density of 5.95 ± 0.02 g cm −3 after sintering and enables the fabrication of intricate shapes such as structures with triangle and hexagonal cavities via laser cutting and holes in high aspect ratio objects via conventional machining.

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“…In order to avoid problems while casting tape from a ceramic mass or pouring a slip into a mold, as well as to ensure good mold impression and good mechanical parameters of raw shapes, it is necessary to ensure a low viscosity and high solid phase content of the ceramic slurry. According to literature reports, in order to ensure good deaeration and slip settling, the suspension should exhibit shear thinning properties and its viscosity in the shear range from 10 to 100 s −1 should be no more than 1 Pa·s [ 17 , 18 , 19 ]. In addition to using rheological measurements to prepare suspensions with the desired viscosity, they can also be used to explain certain phenomena occurring in the gelling phase of the gelcasting method.…”

Section: Introductionmentioning

confidence: 99%

ZTA Pipes with a Gradient Structure-Effect of the Rheological the Behavior of Ceramic Suspensions on the Gradient Structure and Characterized of the Obtained Products

et al. 2021

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This paper focuses on the verifying the possibility of producing Al2O3-ZrO2 composite pipes with a gradient structure using centrifugal slip casting method. The aim of the research is to define the correlation between the rheological properties of aqueous suspensions of ceramic powders with different solid loading and obtaining the ZrO2 phase gradient in the Al2O3 matrix. Such products, due to their unique properties, can be utilized in the transport of aggressive substances, even in extreme temperature or corrosive conditions. The suspensions and the sintered samples were characterized by: broad rheological analysis, scanning electron microscopy, X-ray diffraction, stereological analysis and Vickers hardness tests. The study reports on a series of samples produced of ceramic suspensions (70 vol.% Al2O3–30 vol.% ZrO2) differing in the total solid loading in the range of 30–55 vol.%. The results clearly indicate that obtaining the gradient structure of ceramic-ceramic composite pipes is closely related to the rheological properties of the suspensions from which the samples are cast. The phase gradient is obtainable from suspensions 30–40 vol.%, in which the possibility of moving ZrO2 particles relative to the Al2O3 is quite high—these suspensions are characterized by low viscosity and the dominance of viscous over elastic properties (G′ > G″).

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Direct coagulation casting of yttria-stabilized zirconia using magnesium citrate and glycerol diacetate

Cited by 27 publications

References 35 publications

In situ coagulation of yttria‐stabilized zirconia ceramic with enhancement of green body via polyvinyl pyrrolidone crosslink

In situ coagulation of yttria‐stabilized zirconia ceramic with enhancement of green body via polyvinyl pyrrolidone crosslink

Polymer Bridging Induced by a Single Additive Imparts Easy-To-Implement Green Machinability to Yttria-Stabilized Zirconia

ZTA Pipes with a Gradient Structure-Effect of the Rheological the Behavior of Ceramic Suspensions on the Gradient Structure and Characterized of the Obtained Products

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