Method for manufacturing metal foam

A method for manufacturing a metal foam comprising applying an electromagnetic field to a green structure formed by using a slurry,

• wherein the applying of the electromagnetic field to the green structure sinters the green structure to form the metal foam,
• wherein the green structure, formed by coating the slurry on a plate, is a film having a thickness of 200 μm or less,
• wherein the slurry consists of a metal component, water, ethyl cellulose, and a binder,
• wherein the metal component comprises a conductive metal having a relative magnetic permeability of 90 or more or an alloy comprising the conductive metal,
• wherein the water is contained in the slurry at a ratio of 80 to 300 parts by weight relative to 100 parts by weight of the metal component,
• wherein the ethyl cellulose is contained in the slurry at a ratio of 10 to 100 parts by weight relative to 100 parts by weight of the metal component,
• wherein the binder has a solubility in the water of 100 mg/mL or more at room temperature,
• wherein the metal foam has a porosity of 80% or more, and
• wherein the electromagnetic field is formed by applying a current in a range of 250 A to 400 A at a frequency in a range of 250 kHz to 400 kHz for a time of 1 minute to 30 minutes.