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Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings

State Key Laboratory of Powder Metallurgy, Central South University; Changsha 410012, Hunan, China
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Materials 2019, 12(9), 1537; https://doi.org/10.3390/ma12091537
Received: 1 April 2019 / Revised: 1 May 2019 / Accepted: 6 May 2019 / Published: 10 May 2019
(This article belongs to the Special Issue Carbon-based and Silicon-based Nanomaterials)
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Abstract

SiC particles (SiCp)-reinforced Al–Si matrix composite coatings were synthesized on 4032 aluminum alloy by laser cladding using powder mixtures of Al-20 wt.% Si alloy and electroless copper-plated SiC particles (SiCp-Cu). The effects of SiCp-Cu content on microstructure, phase composition, and microhardness of the SiCp/Al–Si laser cladding layer (LCL) were investigated systematically. The results showed that the microstructure of SiCp-Cu/Al–Si LCL was mainly composed of undissolved SiCp, lump-like primary Si, lump-like Al2Cu, plate-like Al4SiC4, and Al–Si–Cu ternary eutectic. In addition, the eutectic microstructure became finer with the increasing of SiCp-Cu content. The average microhardness of the LCL increased with the increasing of SiCp-Cu content. When SiCp-Cu content was 50 wt.%, the average microhardness of the LCL reached 508 HV0.05, which was about 3.5 times larger than that of the substrate. The LCL reinforced with a SiCp-Cu content of 30 wt.% exhibits the best wear resistance. View Full-Text
Keywords: laser cladding layer; laser processing; electroless copper; microhardness laser cladding layer; laser processing; electroless copper; microhardness
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Liu, Y.; Li, G.; Jiang, W. Effects of Cu-Coated SiC Content on Microstructure and Properties of Laser Cladding SiCp/Al–Si Composite Coatings. Materials 2019, 12, 1537.

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