Design and Fabrication of Metal Matrix Syntactic Foams by Low-Pressure Injection Molding
Metal matrix syntactic foams are particulate composite foams composed of a supporting metal matrix and high-strength hollow particles. These materials have higher specific strengths and specific stiffnesses compared to solid metals and metal foams. The reinforced porosity in these foams is the primary cause of this increase in strength-to-density ratio. Metal matrix syntactic foams can be difficult to manufacture, however, without extensive fracture of the hollow particles. The first goal of this study was to optimize a water-based binder for low-pressure injection molding of metal matrix syntactic foams. The optimized binder composition was 7% agar, 4% glycerin, and 89% water. The second goal of this study was to test the material compatibility between silicate glass materials and copper alloys. It was found the common copper sintering aids reacted negatively with silicate glasses such that they melted at or below the sintering temperature of the metal. Pure copper does not have this issue, but it is conversely difficult to sinter to full density.
M. Spratt et al., "Design and Fabrication of Metal Matrix Syntactic Foams by Low-Pressure Injection Molding," Proceedings of the 11th International Conference on Porous Metals and Metallic Foams (2019, Dearborn, MI), pp. 95-106, Springer, Aug 2020.
The definitive version is available at https://doi.org/10.1007/978-3-030-42798-6_9
11th International Conference on Porous Metals and Metallic Foams, MetFoam 2019 (2019: Aug. 20-23, Dearborn, MI)
Materials Science and Engineering
Mechanical and Aerospace Engineering
Keywords and Phrases
Injection molding; Metal; Syntactic foam
International Standard Book Number (ISBN)
International Standard Serial Number (ISSN)
Article - Conference proceedings
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01 Aug 2020