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Materials
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Development and Exploitation of Technologies to Recycling Waste Composites
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Development and Exploitation of Technologies to Recycling Waste Composites

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (20 May 2022) | Viewed by 4724

Special Issue Editor

Dr. Olga Rodríguez Largo

E-Mail Website
Guest Editor
Department of Primary Metallurgy and Materials Recycling, National Center for Metallurgical Research (CENIM-CSIC), 28040 Madrid, Spain
Interests: recycling; waste; hydrometallurgy; circular economy; mining waste; battery waste; metals; rare earth
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue “Development and Exploitation of Technologies to Recycling Waste Composites” aims to collect a large range of contributions concerning different aspects, technologies and advances in recycling waste composites. The steadily growing demand for composites, mainly fiber-reinforced ones, is due, on the one hand, to their excellent properties and, on the other hand, to the decrease in their price over the years. The production of these materials leads to a worldwide concern because of their production’s environmental impact and because the final destinations of waste composites are, in most cases, landfills. The recycling of composites is not an easy task, and their heterogeneity, which makes them excellent materials, makes their recycling difficult. For this reason, investigations about processes and techniques to recover this waste are an important aim of the scientific community. Nowadays, various technologies are being investigated to efficiently recover composite waste, mainly mechanical, chemical and thermochemical technologies, or a combination of them. Articles and reviews dealing with the development of any cited recycling technology, and any innovative technologies that could be used for composites, as well as their exploitation, are very welcome.

Dr. Olga Rodríguez Largo
Guest Editor

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2600 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • composites
  • waste
  • fiber-reinforced composite
  • recycling
  • technologies
  • exploitation
  • mechanical recycling
  • chemical recycling
  • thermal recycling
  • thermochemical recycling

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Published Papers (2 papers)

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8 pages, 3144 KiB  
Article
Recycling of Carbon Fibres and Subsequent Upcycling for the Production of 3D-CFRP Parts
by David Rabe, Eric Häntzsche and Chokri Cherif
Materials 2022, 15(14), 5052; https://doi.org/10.3390/ma15145052 - 20 Jul 2022
Cited by 5 | Viewed by 1665
Abstract
Carbon fibres (CF) are used in CF reinforced plastic (CFRP) components. However, waste from CF yarn trim, CFRP and the end of life (EOL) CFRP structures will cause a recycling challenge in the next decades because of strict environmental regulations. Currently, recycling is [...] Read more.
Carbon fibres (CF) are used in CF reinforced plastic (CFRP) components. However, waste from CF yarn trim, CFRP and the end of life (EOL) CFRP structures will cause a recycling challenge in the next decades because of strict environmental regulations. Currently, recycling is carried out almost entirely by the use of pyrolysis to regain CF as a valuable resource. This high temperature process is energy consuming, and the resulting fibres are brittle. Hence, they are not suitable for processing of textiles into yarns or new reinforcement structures. To enable grave to cradle processing, a new approach based on a solvolysis recovery of CF and subsequent yarn spinning to obtain hybrid yarns suitable for textile processing, especially by weft knitting, was the focus of the international research project IGF/CORNET 256EBR. For the first time, it was possible to process hybrid yarns made of rCF on a weft knitting machine to produce biaxial reinforced structures to form CFRP from recycled carbon fibres. Therefore, various modifications were done on the textile machinery. In this way, it was possible to process the rCF and to get out a reproducible textile structure for the production of 3D recycled CFRP (rCFRP) parts. Full article
(This article belongs to the Special Issue Development and Exploitation of Technologies to Recycling Waste Composites)
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Review

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14 pages, 10434 KiB  
Review
Recycling of Aluminum-Based Composites Reinforced with Boron-Tungsten Fibres
by Viktors Mironovs, Yulia Usherenko, Irina Boiko and Jekaterina Kuzmina
Materials 2022, 15(9), 3207; https://doi.org/10.3390/ma15093207 - 29 Apr 2022
Cited by 2 | Viewed by 2469
Abstract
High strength fibres of carbon, boron, silicon carbide, tungsten, and other materials are widely used to reinforce metal matrix composite materials. Carbon and boron fibers are usually used to reinforce light alloys based on aluminum and magnesium. Products made from these materials are [...] Read more.
High strength fibres of carbon, boron, silicon carbide, tungsten, and other materials are widely used to reinforce metal matrix composite materials. Carbon and boron fibers are usually used to reinforce light alloys based on aluminum and magnesium. Products made from these materials are characterized by high strength and rigidity and can be used for a long time. Technological waste containing such fibres are hazardous to the environment because they are durable and have needle-like and other sharp shapes. Therefore, they must be disposed of with extreme care. A significant incentive for the processing and reuse of waste composites of this type is the relatively high cost of production of the primary fibre and the material as a whole. With the increase in the production of such materials in recent years, the need to recycle composite waste is becoming increasingly important. Three main options for primary processing are used to prepare composites for their subsequent use. They are mechanical, thermal, and chemical grinding technologies. One of the actual and practical areas of processing technology is the method of powder metallurgy. This paper presents the main stages of processing composite materials based on an aluminium matrix and B-W fibres to obtain powder compositions. The results of the studies showing the possibility of the effective use of the obtained crushed waste to manufacture concrete products and the production of cutting and grinding tools are presented. Full article
(This article belongs to the Special Issue Development and Exploitation of Technologies to Recycling Waste Composites)
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