Stir Casting Routes for Processing Metal Matrix Syntactic Foams: A Scoping Review

• Type: Article in International Scientific Journal
• Date: 2022

Authors

de la Muela, AMS (Author) Other; Duarte, J (Author) FEUP; João Santos Baptista (Author) FEUP; Cambronero, LEG (Author) Other; Ruiz-Roman, JM (Author) Other; Elorza, FJ (Author) Other

Journal

The Journal is awaiting validation by the Administrative Services.

Title: PROCESSES

Vol. 10

Final page: 478

ISSN: 2227-9717

Indexing

ISI Web of Knowledge - 0 Citations

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Scientific classification

CORDIS: Technological sciences > Engineering > Mechanical engineering > Metalurgia Metallurgy

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-00W-6FH

DOI: 10.3390/pr10030478

Abstract (EN): Metal matrix syntactic foams (MMSFs) are advanced lightweight materials constituted by a metallic matrix and a dispersion of hollow/porous fillers. Physical and mechanical properties can be fitted regarding matrix and filler properties and processing parameters. Their properties make them potential materials for sectors where density is a limiting parameter, such as transport, marine, defense, aerospace, and engineering applications. MMSFs are mainly manufactured by powder metallurgy, infiltration, and stir casting techniques. This study focuses on the current stir casting approaches and on the advances and deficiencies, providing processing parameters and comparative analyses on porosity and mechanical properties. PRISMA approaches were followed to favor traceability and reproducibility of the study. Stir casting techniques are low-cost, industrially scalable approaches, but they exhibit critical limitations: buoyancy of fillers, corrosion of processing equipment, premature solidification of molten metal during mixing, cracking of fillers, heterogeneous distribution, and limited incorporation of fillers. Six different approaches were identified; four focus on limiting buoyancy, cracking, heterogeneous distribution of fillers, and excessive oxidation of sensitive matrix alloys to oxygen. These improvements favor reaching the maximum porosity of 54%, increasing the fillers' size from a few microns to 4-5 mm, reducing residual porosity by +/- 4%, synthesizing bimodal MMSFs, and reaching maximum incorporation of 74 vol%.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 24