Efficient separation of reinforcements and matrix alloy from aluminum matrix composites by supergravity technology

A supergravity-induced separation method was proposed to recover matrix alloy and SiC particles from scrap aluminum matrix composites (AMCs). Effects of the gravity coefficient (G), temperature (T), and separation time (t) on the separation efficiencies were evaluated and the corresponding separatio...

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Veröffentlicht in:Journal of alloys and compounds 2020-11, Vol.843, p.155814, Article 155814
Hauptverfasser: Sun, Ningjie, Wang, Zhe, Guo, Lei, Wang, Lu, Guo, Zhancheng
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Wang, Zhe
Guo, Lei
Wang, Lu
Guo, Zhancheng
description A supergravity-induced separation method was proposed to recover matrix alloy and SiC particles from scrap aluminum matrix composites (AMCs). Effects of the gravity coefficient (G), temperature (T), and separation time (t) on the separation efficiencies were evaluated and the corresponding separation mechanism was analyzed. Under optimum conditions (T = 710 °C, G = 600, and t = 300 s), the recovery rates of Al and SiC reached 83.9 and 98.2%, respectively. The theoretical calculated separating efficiencies based on the capillary law were in good consistent with the observed values. At 710 °C, the interfacial reaction between liquid Al and SiC that produced Al4C3 and free Si was limited. A small amount of Al4C3 was retained in the residue. After removing Al4C3 and excess metallic Al from the residue by acid pickling, the SiC particles were thoroughly recovered and could be directly reused as fresh reinforcements. Moreover, an amplified centrifugal separation apparatus was conceptually designed for recycling AMC scraps on an engineering scale. Preliminary results indicate that supergravity technology can be potentially employed as a practical process for recovering reinforcements and matrix alloy from scrap AMCs. •The supergravity field was employed for recycling AMC scraps.•High separation efficiencies of Al alloy and SiC particles were achieved.•The recovered SiC particles can be reused as fresh reinforcements.•A conceptual design of supergravity apparatus on industrial scale was conducted.
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Effects of the gravity coefficient (G), temperature (T), and separation time (t) on the separation efficiencies were evaluated and the corresponding separation mechanism was analyzed. Under optimum conditions (T = 710 °C, G = 600, and t = 300 s), the recovery rates of Al and SiC reached 83.9 and 98.2%, respectively. The theoretical calculated separating efficiencies based on the capillary law were in good consistent with the observed values. At 710 °C, the interfacial reaction between liquid Al and SiC that produced Al4C3 and free Si was limited. A small amount of Al4C3 was retained in the residue. After removing Al4C3 and excess metallic Al from the residue by acid pickling, the SiC particles were thoroughly recovered and could be directly reused as fresh reinforcements. Moreover, an amplified centrifugal separation apparatus was conceptually designed for recycling AMC scraps on an engineering scale. 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Preliminary results indicate that supergravity technology can be potentially employed as a practical process for recovering reinforcements and matrix alloy from scrap AMCs. •The supergravity field was employed for recycling AMC scraps.•High separation efficiencies of Al alloy and SiC particles were achieved.•The recovered SiC particles can be reused as fresh reinforcements.•A conceptual design of supergravity apparatus on industrial scale was conducted.</abstract><cop>Lausanne</cop><pub>Elsevier B.V</pub><doi>10.1016/j.jallcom.2020.155814</doi></addata></record>
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subjects Aluminum
Aluminum base alloys
Aluminum carbide
Aluminum matrix composite
Aluminum matrix composites
Gravitational effects
Interface reactions
Metal scrap
Particulate composites
Pickling
Recycling
Residues
Separation
Separation mechanism
Silicon carbide
Supergravity
title Efficient separation of reinforcements and matrix alloy from aluminum matrix composites by supergravity technology
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