Sinter forging of rapidly quenched eutectic Al2O3–ZrO2(Y2O3)-glass powders

Balasubramanian, Sreeram; Keshavan, H.; Cannon, W. Roger

doi:10.1016/j.jeurceramsoc.2005.01.010

Cited by 16 publications

(8 citation statements)

References 12 publications

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“…The cooling rate of the above mentioned process is still too high to obtain bulk (more than 1 cm) ceramics with fine grains, limiting the achievable forms to thin film, ribbons, fibers and small spheres [9][10][11]. It is generally regarded that providing external field could take effect in solving such a problem.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of bulk Al2O3 by combustion synthesis melt-casting under ultra-high gravity

Pei

Liu

et al. 2009

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 99%

Fabrication of bulk Al2O3 by combustion synthesis melt-casting under ultra-high gravity

Pei

Liu

et al. 2009

Journal of Alloys and Compounds

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“…The challenge then is to maintain the fine microstructure in the dense compact. We have been successful in at least maintaining some of the microstructure features in the nanosize range (<100 nm) 6,7 …”

Section: Introductionmentioning

confidence: 99%

Hot Pressing of Spherical, Polycrystalline 3Y‐TZP Particles

Auechalitanukul

Cannon

2010

Journal of the American Ceramic Society

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As an alternative route to hot‐pressing fine powders for obtaining fine‐grained microstructures, coarse spherical polycrystalline particles having a fine‐grained microstructure were hot pressed. Three size fractions of particles, nominally 25, 45, and 75 μm, were prepared by presintering Tosoh yttria‐stabilized zirconia (Y‐TZP) spray‐dried granules. Samples were hot pressed at 1350°C for 1 h using pressures of 6, 10, 20, and 40 MPa. It was found that dense (>98%) 3Y‐TZP monolith could be produced at 40 MPa, which retained the fine grain size (0.3 μm) of the starting polycrystalline particles. The densification rate was particle size independent when the pressure was at least 10 MPa. It was determined that the densification rates agreed with Helle et al.'s predicted rates based on superplastic creep‐controlled hot pressing.

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“…Most studies of pressure‐assisted densification of multigrain powder, where the particle size is much larger than the grain size, were performed on rapidly solidified powder. For instance, in References and spherical 5–25 μm‐sized particles were synthesized by passing spray‐dried agglomerates through an inert plasma flame above the melting temperature and rapidly quenching them in water. The most widely studied material is the Al 2 O 3 –ZrO 2 eutectic composition.…”

Section: Introductionmentioning

confidence: 99%

“…An alternative, which has recently been considered, is to hot press or hot forge micrometer-sized spherical particles having nanoscale microstructures while attempting to maintain the nanostructure during densification. [1][2][3] The advantage of this process over the nanoparticulate route is that powders are much easier to handle, do not hydrate or adsorb appreciable gases from the atmosphere, and are easily formed to green bodies with densities on the order of 60% or more. The process also avoids health hazards associated with ingesting nanoparticulate powders.…”

Section: Introductionmentioning

confidence: 99%

Hot Forging of Spherical Particles with Nanocrystalline Microstructures

2012

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An alternate method for fabricating ceramics with fine‐ or nano‐ scale microstructures is presented. Powder consisting of 2–25 μm diameter spherical particles (average 16 μm) obtained by plasma melting of spray‐dried powder and quenching into water, were hot pressed and hot forged. Three different compositions were studied: eutectic alumina‐zirconia, the eutectic composition with 1%Y2O3, and the eutectic composition with borosilicate glass. As‐quenched particles (Al2O3–(1%Y2O3)ZrO2) contained both amorphous material and 50–80 nm crystallites. Microstructural development of the Al2O3–(1%Y2O3) ZrO2 was followed from room temperature up to hot pressing/hot forging temperatures. When fully dense after forging at 1350°C, the microstructure contained ZrO2 phases <100 nm in diameter embedded in the Al2O3 matrix. Al2O3 grains had an irregular morphology and were on the scale of ~1 μm diameter. A higher order structure designated as cells, containing a few of these grains, were enclosed by boundaries decorated with ZrO2 particles.

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Sinter forging of rapidly quenched eutectic Al2O3–ZrO2(Y2O3)-glass powders

Cited by 16 publications

References 12 publications

Fabrication of bulk Al2O3 by combustion synthesis melt-casting under ultra-high gravity

Fabrication of bulk Al2O3 by combustion synthesis melt-casting under ultra-high gravity

Hot Pressing of Spherical, Polycrystalline 3Y‐TZP Particles

Hot Forging of Spherical Particles with Nanocrystalline Microstructures

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