The reinforcing effect of graphene nano-platelets on the cryogenic mechanical properties of GNPs/Al2O3 composites

Wu, Weiwei; Gui, Jingya; Wei, Sai; Xie, Zhipeng

doi:10.1016/j.jallcom.2016.08.314

Cited by 28 publications

(17 citation statements)

References 33 publications

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“…A spark plasma sintered silicon nitride material incorporating 3 wt.% GNPs has also been fabricated, with a 56% reduction in dry sliding wear rate [10]. Other work has investigated varying wt.% levels of GNP from 0.5 to 2.0, in spark plasma sintered GNP/alumina composite [11,12]. In the case of 1% GNP loading, at room temperature, the effect of toughening was seen via direct observation of the crack deflection around a single GNP after fracture of the material.…”

Section: Introductionmentioning

confidence: 99%

Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Murray

Rance

et al. 2018

Journal of the European Ceramic Society

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An alumina coating containing 1 wt.% graphene nanoplatelets (GNPs) is deposited for the first time by suspension high velocity oxy-fuel (SHVOF) thermal spraying -an emerging coating deposition technique. Raman spectroscopy shows the GNPs survive the process albeit with a two-fold increase in the density of defects in the graphitic lattice. Dry-sliding wear testing at a 10 N load yields a two order of magnitude reduction in the specific wear rate for the alumina/GNP composite in comparison to the equivalent pure alumina coating. Testing with varying loads shows that the transition to the severe wear regime is prevented until between 30 and 35 N for the alumina + GNP coating which otherwise occurs between 5 and 7.5 N in the absence of GNPs. A reinforced microstructure, and specifically fracture toughness, explains the improved wear behaviour as opposed to tribofilm formation.

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Section: Introductionmentioning

confidence: 99%

Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Murray

Rance

et al. 2018

Journal of the European Ceramic Society

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“…The thin graphene sheets are usually located at the grain boundaries but sometimes lie within the grain, as shown in Figs. 5(a) and 5(b) [16,75]. It is difficult to build the special structure of graphene in the ceramic matrix by colloidal processing method, but through building the core-shell structure in the powder nanocomposites and viscous sintering caused by SiO 2 , Ru et al [69] realized the anisotropic structure in rGO/mullite composites.…”

Section: Microstructure Of the Bulk Compositesmentioning

confidence: 99%

“…To [15,73,98,99], the single-edge notched beam (SENB) method [52,79], the Chevron notch technique [69,75], the single-edge v-notched beam (SEVNB) method [92,95], and single-edge pre-cracked beam (SEPB) method. Typically, during micro-hardness testing, fracture toughness can be simply determined by measuring the crack lengths produced by Vickers indentation; at the same time, hardness can be obtained.…”

Section: Mechanical Properties and Applicationsmentioning

confidence: 99%

“…Compared with CNTs, graphene with ultrahigh electrical conductivity and a larger contact area for building the conductive path, show greater potential to dramatically alter the electrical performances of the composites. For instance, the percolation threshold of the GNSs/Al 2 O 3 [26,27,45,50,70,76,77,[80][81][82], colloidal processing [52,79], and molecular level mixing [17,75,84,85] composite was as low as 3 vol%. When the GNSs content increased to15 vol%, the electrical conductivity achieved 5709 S/m, which was 170% higher than the highest conductivity previously reported in CNT/Al 2 O 3 composites [105].…”

Section: Electrical/electromagnetic Properties and Applicationsmentioning

confidence: 99%

See 1 more Smart Citation

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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“…An example of using the cryogenic chamber to determine mechanical properties of materials at the cryogenic temperature of joints is the one in the article [22]. Graphene [23] and alloy steels [24] and austenitic steels [25] are also tested under cryogenic conditions.…”

Section: Introductionmentioning

confidence: 99%

The Influence of Cryogenic Conditions on the Process of AA2519 Aluminum Alloy Cracking

2020

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This study presents the results of tests involving determining quantities used to describe fracture toughness of a heat-treated AA2519 aluminum alloy applied in, among other things, constructing American military amphibians. These quantities were determined using the J–R curve method for two temperature values, 293 K and 77 K. The low temperature was provided by putting the tested specimen into a liquid nitrogen bath and keeping it there throughout the experiment. Based on the tests results, cryogenic conditions cause an increase in the maximum experimental value of the J–JQ integral, from 66.3 to 87.3 kJ/m2 Moreover, an analysis of the fatigue fracture microstructure revealed differences between specimens tested in ambient temperature and those tested in cryogenic temperature.

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The reinforcing effect of graphene nano-platelets on the cryogenic mechanical properties of GNPs/Al2O3 composites

Cited by 28 publications

References 33 publications

Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Alumina-graphene nanocomposite coatings fabricated by suspension high velocity oxy-fuel thermal spraying for ultra-low-wear

Controllable fabrication and multifunctional applications of graphene/ceramic composites

The Influence of Cryogenic Conditions on the Process of AA2519 Aluminum Alloy Cracking

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