Alumina/zirconia composites toughened by the addition of graphene flakes

Boniecki, Marek; Gołębiewski, Przemysław; Wesołowski, Władysław; Woluntarski, Michał; Anna, P.; Romaniec, M.; Ciepielewski, P.; Krzyżak, K.

doi:10.1016/j.ceramint.2017.05.025

Cited by 43 publications

(17 citation statements)

References 18 publications

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“…Graphene oxide (GO) flakes dispersed in water were obtained from natural graphite by the modified Hummers’ method [29–30] in the Department of Chemical Synthesis and Flake Graphene, Institute of Electronic Materials Technology, Warsaw, Poland. Then, the GO flakes in water were transferred by solvent exchange into isopropanol (IPA) and were sonicated to achieve a stable GO-IPA suspension of a known concentration.…”

Section: Methodsmentioning

confidence: 99%

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

Mrukiewicz

Kowiorski

Perkowski

et al. 2019

Beilstein J. Nanotechnol.

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We report a threshold voltage decrease in a nematic liquid crystal compound, 4-cyano-4′-pentylbiphenyl (5CB), doped with graphene oxide (GO) flakes at a concentration of 0.05–0.3 wt %. The threshold voltage decrease was observed at the same concentration in electro-optic and dielectric spectroscopy measurements. The effect is related to the disrupted planar alignment due to the strong π–π stacking between the 5CB’s benzene rings and the graphene oxide’s structure. Additionally, we present the GO concentration dependence on the isotropic–nematic phase transition temperature, electric anisotropy, splay elastic constant, switch-on time, and switch-off time. The shape and dimensions of the GO flakes were studied using atomic force microscopy (AFM) and scanning electron microscopy (SEM). The influence of the GO concentration on the physical properties and switching process in the presence of the electric field was discussed.

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Section: Methodsmentioning

confidence: 99%

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

Mrukiewicz

Kowiorski

Perkowski

et al. 2019

Beilstein J. Nanotechnol.

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“…7. In some cases [77,86,87], crack propagation changed from the intergranular mode to the transgranular mode, because graphene located in a grain boundary weakened the grain boundary. Tough ceramics have wide applications in ballistic armors [48], cutting tools [15], wear and corrosion resistance coatings [100], and aerospace applications [101].…”

Section: Mechanical Properties and Applicationsmentioning

confidence: 99%

Controllable fabrication and multifunctional applications of graphene/ceramic composites

Huang¹,

Wan²

2020

J Adv Ceram

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Graphene with excellent comprehensive properties has been considered as a promising filler to reinforce ceramics. While numerous studies have been devoted to the improvement of mechanical and electrical properties, incorporating graphene to ceramics also offers new opportunities for endowing ceramics with versatility. In this review, the recent development of graphene/ceramic bulk composites is summarized with the focus on the construction of well-designed architecture and the realization of multifunctional applications. The processing technologies of the composites are systematically summarized towards homogeneous dispersion and even ordered orientation of graphene sheets in the ceramic matrix. The improvement of composites in mechanical, electrical, electromagnetic, and thermal performances is discussed. The novel multifunctional applications brought by smart integration of graphene in ceramics are also addressed, including microwave absorption, electromagnetic interference shielding, ballistic armors, self-monitor damage sensors, and energy storage and conversion.

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“…Наилучшие успехи на этом пути достигнуты при комбинировании стабилизированного диоксида циркония (обладающего рекордно высокими для оксидных керамик прочностью на изгиб и ударной вязкостью) и корунда, характеризующегося высокой твердостью [1][2][3]. Несмотря на сохранение общей закономерности в соотношении твердость/трещиностойкость, это позволяет получать композиционные керамики ZrO 2 −Al 2 O 3 с высокими показателями механических свойств (рис.…”

Section: Introductionunclassified

“…Несмотря на сохранение общей закономерности в соотношении твердость/трещиностойкость, это позволяет получать композиционные керамики ZrO 2 −Al 2 O 3 с высокими показателями механических свойств (рис. 1) [2,[4][5][6][7][8][9][10][11]. Введение мелкодисперсных частиц корунда в матрицу стабилизированного диоксида циркония повышает твердость образуемого композита.…”

Section: Introductionunclassified

Структура и механические свойства композиционной керамики CaO-ZrO-=SUB=-2-=/SUB=--Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- при малых концентрациях корунда

Dmitrievskii¹,

Zhigachev²,

Zhigacheva³

et al. 2019

Журнал Технической Физики

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We have studied the effect of the ratio between concentrations of zirconium dioxide (stabilized by CaO) and corundum on phase composition and mechanical properties of nanostructured CaO–ZrO_2–Al_2O_3 ceramic composites. The CaO–ZrO_2–Al_2O_3 composites sintered at temperatures typical of ZrO_2 are found to be characterized by the optimal microhardness/fracture toughness ratio at corundum content $${{C}_{{{\text{A}}{{{\text{l}}}_{2}}{{{\text{O}}}_{3}}}}}$$ = 5%. These composites have a high flexural strength; their porosity, coefficient of friction, and wear are typical of those for CaO–ZrO_2 ceramics.

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Alumina/zirconia composites toughened by the addition of graphene flakes

Cited by 43 publications

References 18 publications

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

Threshold voltage decrease in a thermotropic nematic liquid crystal doped with graphene oxide flakes

Controllable fabrication and multifunctional applications of graphene/ceramic composites

Структура и механические свойства композиционной керамики CaO-ZrO-=SUB=-2-=/SUB=--Al-=SUB=-2-=/SUB=-O-=SUB=-3-=/SUB=- при малых концентрациях корунда

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