Enhanced properties of alumina–aluminium titanate composites obtained by spark plasma reaction-sintering of slip cast green bodies

Borrell, Amparo; Salvador, M. D.; Rocha, Victoria García; Fernández, Adolfo; Molina, Tamara; Moreno, Rodrigo

doi:10.1016/j.compositesb.2012.11.010

Cited by 30 publications

(14 citation statements)

References 31 publications

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“…Nowadays, a bulk ceramic piece with a nanostructured microstructure can be produced by sintering nano-sized powders via fast routes (to prevent grain growth) such as microwave furnaces [7,8] or Spark Plasma Sintering techniques [9,10].…”

Section: Introductionmentioning

confidence: 99%

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

Klyatskina

Rayón

Darut

et al. 2015

Surface and Coatings Technology

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Section: Introductionmentioning

confidence: 99%

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

Klyatskina

Rayón

Darut

et al. 2015

Surface and Coatings Technology

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“…The adsorbed oxygen molecule picks up the CB electron to form superoxide radical ion (O 2 •–) which through a series of reactions provides reactive oxidizing species. Alumina is an insulator with band gap energy of about 9 eV, it is a metal oxide with high mechanical strength, high specific area, and thermal, chemical and mechanical resistance …”

Section: Introductionmentioning

confidence: 99%

Alumina coating with TiO₂and its effect on catalytic photodegradation of phenol andp-cresol

Gómez

Angel

Ramos-Ramírez

et al. 2016

J. Chem. Technol. Biotechnol.

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BACKGROUND This study is focused on the peptization of Boehmite and titanium alkoxide (modified sol–gel method) to obtain Al2O3–TiO2 mixed oxides taking advantage of the physicochemical properties of TiO2 and Al2O3. TiO2 is an important semiconductor and the most active photocatalyst. Al2O3 is an insulator with high surface area and thermal, chemical and mechanical resistance. It is possible to produce high surface area materials, where TiO2 is dispersed on the alumina surface for photodegradation of pollutants. RESULTS γ‐Al2O3–TiO2 (5, 10 and 15 wt% TiO2) mixed oxides presented stabilization of the anatase phase. Rietveld studies showed incorporation of the Al3+ into the TiO2 anatase and Ti4+ into the Al2O3. They exhibit higher specific surface area than pure TiO2. The TiO2‐coated alumina surface with small TiO2 particles produced a large number of active sites on the surface. The sample with 15 wt% of TiO2 presented the highest photodegradation of p‐cresol and phenol. CONCLUSION The addition of TiO2 to the alumina improved the photoactivity of pure TiO2 producing materials with higher surface area covered with TiO2. Alumina delayed the recombination of photogenerated electron–hole pairs favoring the formation of highly reactive •OH radicals. The photodegradation of p‐cresol and phenols increased with TiO2 loading increase. © 2016 Society of Chemical Industry

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“…To improve the dispersion of such nanoparticles one possible route is the colloidal filtration, which has been also explored recently to obtain dense A/AT materials [9,10]. Recently, we have described also the possibility to obtain dense A/AT materials by a spark plasma reaction sintering (SPS) process using cast green bodies instead of the conventional mixture of powders [11]. This method has the 3 advantage that the components of the mixture have been already dispersed and shaped to a green body with high particle packing.…”

Section: Introductionmentioning

confidence: 99%

“…The colloidal stability of aqueous suspensions of TiO 2 nanopowders was studied in previous works by measuring the zeta potential as a function of deflocculant content and pH and the conductivity [10,11] for obtaining concentrated suspensions of both studied materials [16,17]. The suspensions were prepared by first adding the PAA required to disperse the nanosized titania particles (4 wt.% PAA in relation to the titania content); the titania nanopowder was subsequently added and homogenized by sonication for 1 min.…”

Section: Preparation and Characterization Of Suspensionsmentioning

confidence: 99%

EPD and spark plasma sintering of bimodal alumina/titania concentrated suspensions

Borrell

Salvador

Rocha

et al. 2013

Journal of Alloys and Compounds

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ElsevierBorrell Tomás, MA.; Salvador Moya, MD.; Rocha, VG.; Fernández, A.; Molina, T.; Moreno, R. (2013). EPD and Spark Plasma Sintering of bimodal alumina/titania concentrated suspensions. Journal of AbstractAlumina-aluminium titanate (A-AT) composites and laminates have been recently investigated because they can provide improved flaw tolerance and toughness associated to a microcracking mechanism. A-AT composites have been produced by slip casting and reaction sintering of submicron sized alumina and titania powders. This work deals with the preparation of thick selfsustained A-AT films from mixtures of submicron sized alumina and nano sized titania powders and further sintering by conventional and non-conventional (spark plasma sintering, SPS) methods.Suspensions were prepared in water to high solid loadings, up to 50 vol.%. Self-sustained films were obtained by aqueous electrophoretic deposition (EPD) using graphite substrates under constant 2 current density conditions. The evolution of mass per unit area with current density and deposition time was recorded. The films were characterized in the green state and after sintering at different temperatures (1300-1400) ºC. Fully dense A-AT reaction sintered materials were obtained at low temperature by SPS.

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Enhanced properties of alumina–aluminium titanate composites obtained by spark plasma reaction-sintering of slip cast green bodies

Cited by 30 publications

References 31 publications

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

Alumina coating with TiO₂and its effect on catalytic photodegradation of phenol andp-cresol

EPD and spark plasma sintering of bimodal alumina/titania concentrated suspensions

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Enhanced properties of alumina–aluminium titanate composites obtained by spark plasma reaction-sintering of slip cast green bodies

Cited by 30 publications

References 31 publications

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

A study of the influence of TiO2 addition in Al2O3 coatings sprayed by suspension plasma spray

Alumina coating with TiO2and its effect on catalytic photodegradation of phenol andp-cresol

EPD and spark plasma sintering of bimodal alumina/titania concentrated suspensions

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Alumina coating with TiO₂and its effect on catalytic photodegradation of phenol andp-cresol