Pulse Electric Current Sintering of Transition Alumina/Zirconia Composite Powders Prepared by a Novel Sol-Gel Route

将大, 飛田; 洋一, 矢島; 朋浩, 山口; 誠一, 樽田; 圀夫, 北島

doi:10.2109/jcersj.113.543

Cited by 4 publications

(2 citation statements)

References 18 publications

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“…We have shown that the use of M 2+ -doped -aluminas [3,7,8] synthesized through a polyhydroxoaluminum (PHA) sol-gel process [9][10][11] yields a fine grain size upon sintering due to the intimate mixing of dopants at an atomic level. Among the divalent cation dopants reported in our previous study, Ca 2+ is by far the best dopant for suppressing the grain growth of -alumina upon heating [7].…”

Section: Introductionmentioning

confidence: 99%

Densification of rare-earth (Lu, Gd, Nd)-doped alumina nanopowders obtained by a sol–gel route under seeding

Odaka

Yamaguchi

Fujita³

et al. 2009

Powder Technology

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Rare-earth (RE: Lu, Gd, Nd, 0.10 mol%)-doped alumina nanopowders were prepared by a new sol-gel route using polyhydroxoaluminum (PHA) and RECl3 solutions under -alumina (~75 nm) seeding. Among the rare-earth dopants studied, Lu yields the most suitable nanopowders for low-temperature densification. The 0.10 mol% Lu-doped nanopowders, which were obtained at a calcination temperature of 900°C under 5 mass% -alumina seeding, consisted of ~80-nm -alumina particles and -alumina nanoparticles. Using these Lu-doped alumina nanopowders, fully densified alumina ceramics with a uniform microstructure composed of fine grains with an average size of 0.61 μm could be obtained at 1400°C by pressureless sintering. Clearly, the Lu-doped nanopowders obtained here represent a viable option for fabricating dense, finer-grained alumina ceramics because an undoped sample with 5 mass% seeds gave a microstructure with an average grain size of 1.78 μm at 1400°C.

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Section: Introductionmentioning

confidence: 99%

Densification of rare-earth (Lu, Gd, Nd)-doped alumina nanopowders obtained by a sol–gel route under seeding

Odaka

Yamaguchi

Fujita³

et al. 2009

Powder Technology

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“…A promising solution for avoiding these problems could be the direct synthesis of alumina nanoparticles on the CNFs surface. There are many processes for synthesizing ceramic nanopowders such as mechanical synthesis, vapor phase reaction, precipitation and combustion or sol-gel methods [17]. Although there are different limitations in all the aforementioned methods [18][19], wet chemical methods are especially useful for this purpose.…”

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confidence: 99%

Surface coating on carbon nanofibers with alumina precursor by different synthesis routes

Borrell

Rocha

Torrecillas

et al. 2011

Composites Science and Technology

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ElsevierBorrell Tomás, MA.; Rocha, VG.; Torrecillas, R.; Fernandez, A. (2011) ABSTRACTAlumina-reinforced carbon nanofiber nanocomposites were prepared using different routes; powders mixture, colloidal route and sol-gel process followed by spark plasma sintering (SPS). CNFs/xAl2O3 (x=10-50 vol.%) were prepared through nanopowders mixing in a high-energy attrition milling. The main limitations in the preparation of this kind of nanocomposites are related to the difficulty in obtaining materials with a homogeneous distribution of both phases and the different chemical nature of CNFs and Al2O3, which causes poor interaction between them. A surface coating of CNFs by wet chemical routes with an alumina precursor is proposed as a very effective way to improve the interaction between CNFs and Al2O3. An improvement of 50% in fracture strength was found for similar nanocomposite compositions when the surface coating 2 was used. The improved mechanical properties of these nanocomposites are caused by stronger interaction between the CNFs and Al2O3.

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Consolidation/synthesis of materials by electric current activated/assisted sintering

Orrù

Licheri

Locci

et al. 2009

Materials Science and Engineering: R: Reports

1,138

546

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Pulse Electric Current Sintering of Transition Alumina/Zirconia Composite Powders Prepared by a Novel Sol-Gel Route

Cited by 4 publications

References 18 publications

Densification of rare-earth (Lu, Gd, Nd)-doped alumina nanopowders obtained by a sol–gel route under seeding

Densification of rare-earth (Lu, Gd, Nd)-doped alumina nanopowders obtained by a sol–gel route under seeding

Surface coating on carbon nanofibers with alumina precursor by different synthesis routes

Consolidation/synthesis of materials by electric current activated/assisted sintering

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