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      Investigation of Electromagnetic Pulse Compaction on Conducting Graphene/PEKK Composite Powder

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          Abstract

          Polymer-composite materials have the characteristics of light weight, high load, corrosion resistance, heat resistance, and high oil resistance. In particular, graphene composite has better electrical conductivity and mechanical performance. However, the raw materials of graphene composite are processed into semi-finished products, directly affecting their performance and service life. The electromagnetic pulse compaction was initially studied to get the product Graphene/PEKK composite powder. Simultaneously, spark plasma sintering was used to get the bars to determine the electrical conductivity of Graphene/PEKK composite. On the basis of this result, conducting Graphene/PEKK composite powder can be processed by electromagnetic pulse compaction. Finite element numerical analysis was used to obtain process parameters during the electromagnetic pulse compaction. The results show that discharge voltage and discharge capacitance influence on the magnetic force, which is a main moulding factor affecting stress, strain and density distribution on the specimen during electromagnetic pulse compaction in a few microseconds.

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          Measurement of the elastic properties and intrinsic strength of monolayer graphene.

          Changgu Lee, Xiaoding Wei, Jeffrey Kysar … (2008)
          We measured the elastic properties and intrinsic breaking strength of free-standing monolayer graphene membranes by nanoindentation in an atomic force microscope. The force-displacement behavior is interpreted within a framework of nonlinear elastic stress-strain response, and yields second- and third-order elastic stiffnesses of 340 newtons per meter (N m(-1)) and -690 Nm(-1), respectively. The breaking strength is 42 N m(-1) and represents the intrinsic strength of a defect-free sheet. These quantities correspond to a Young's modulus of E = 1.0 terapascals, third-order elastic stiffness of D = -2.0 terapascals, and intrinsic strength of sigma(int) = 130 gigapascals for bulk graphite. These experiments establish graphene as the strongest material ever measured, and show that atomically perfect nanoscale materials can be mechanically tested to deformations well beyond the linear regime.
          Article 0 comments Cited 1564 times – based on 0 reviews     Review now
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            Additive manufacturing (3D printing): A review of materials, methods, applications and challenges

            Gabriele Imbalzano, Kate T.Q. Nguyen, David Hui … (2018)
            Article 0 comments Cited 1052 times – based on 0 reviews     Review now
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              Graphene-based composite materials.

              Sasha Stankovich, Dmitriy A Dikin, Geoffrey Dommett … (2006)
              Graphene sheets--one-atom-thick two-dimensional layers of sp2-bonded carbon--are predicted to have a range of unusual properties. Their thermal conductivity and mechanical stiffness may rival the remarkable in-plane values for graphite (approximately 3,000 W m(-1) K(-1) and 1,060 GPa, respectively); their fracture strength should be comparable to that of carbon nanotubes for similar types of defects; and recent studies have shown that individual graphene sheets have extraordinary electronic transport properties. One possible route to harnessing these properties for applications would be to incorporate graphene sheets in a composite material. The manufacturing of such composites requires not only that graphene sheets be produced on a sufficient scale but that they also be incorporated, and homogeneously distributed, into various matrices. Graphite, inexpensive and available in large quantity, unfortunately does not readily exfoliate to yield individual graphene sheets. Here we present a general approach for the preparation of graphene-polymer composites via complete exfoliation of graphite and molecular-level dispersion of individual, chemically modified graphene sheets within polymer hosts. A polystyrene-graphene composite formed by this route exhibits a percolation threshold of approximately 0.1 volume per cent for room-temperature electrical conductivity, the lowest reported value for any carbon-based composite except for those involving carbon nanotubes; at only 1 volume per cent, this composite has a conductivity of approximately 0.1 S m(-1), sufficient for many electrical applications. Our bottom-up chemical approach of tuning the graphene sheet properties provides a path to a broad new class of graphene-based materials and their use in a variety of applications.
              Article 0 comments Cited 856 times – based on 0 reviews     Review now
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                Author and article information

                Journal
                Journal ID (nlm-ta): Materials (Basel)
                Journal ID (iso-abbrev): Materials (Basel)
                Journal ID (publisher-id): materials
                Title: Materials
                Publisher: MDPI
                ISSN (Electronic): 1996-1944
                Publication date (Electronic): 30 January 2021
                Publication date Collection: February 2021
                Volume: 14
                Issue: 3
                Electronic Location Identifier: 636
                Affiliations
                [1 ]Department of Oil & Gas Production Equipment, Research Institute of Petroleum Exploration and Development, Xueyuan Road 20#, Beijing 100083, China; wqb_upc@ 123456petrochina.com.cn (Q.W.); jiadeli422@ 123456petrochina.com.cn (D.J.); peixh@ 123456petrochina.com.cn (X.P.)
                [2 ]School of Mechanical Engineering, Jiangsu University, Xuefu Road 301#, Zhenjiang 212000, China; 2211903042@ 123456stmail.ujs.edu.cn (H.W.); 18356635336@ 123456163.com (M.C.); chd0527@ 123456163.com (H.C.)
                Author notes
                [* ]Correspondence: xlwu@ 123456ujs.edu.cn (X.W.); xufan-00@ 123456126.com (F.X.)
                Author information
                https://orcid.org/0000-0002-2595-6207
                Article
                Publisher ID: materials-14-00636
                DOI: 10.3390/ma14030636
                PMC ID: 7866504
                SO-VID: 6db75fac-2895-4638-a42a-8831f215dc59
                Copyright © © 2021 by the authors.
                License:

                Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license ( http://creativecommons.org/licenses/by/4.0/).

                History
                Date received : 25 December 2020
                Date accepted : 25 January 2021
                Categories
                Subject: Article

                Keywords: graphene composite,conductivity,spark plasma sintering,magnetic force,electromagnetic pulse compaction
                Data availability:
                Keywords: graphene composite, conductivity, spark plasma sintering, magnetic force, electromagnetic pulse compaction

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