Metal Foam Manufacturing via Induction Sintering

The patent applies preliminary action by forming a green structure with a pre-designed pore-forming agent distribution before sintering. The pore-forming agent is incorporated into the metal powder mixture in advance, creating a template structure that guides uniform pore formation during subsequent processing, thereby achieving both uniform pores and mechanical strength

The patent utilizes parameter changes by controlling the sintering temperature, holding time, and cooling rate to transform the green structure into a dense metal foam with uniform pores. The sintering temperature is optimized to bond metal particles while maintaining pore structure, and the holding time is controlled to achieve complete sintering without pore collapse, thereby simultaneously improving pore uniformity and mechanical strength

The patent applies local quality by creating a gradient distribution of pore-forming agent or using different metal powder sizes in different regions. This allows certain areas to have higher porosity for uniform pore formation while other areas maintain higher density for mechanical strength, achieving both objectives through spatially varying material properties

The patent uses composite materials by combining metal powders with pore-forming agents (such as organic compounds or gas-generating materials) in specific ratios. The pore-forming agent creates uniform pores when decomposed, while the metal matrix provides mechanical strength, achieving a synergistic effect where the composite structure delivers both uniform porosity and adequate strength

The patent replaces mechanical forming methods with a chemical/thermal process by using slurry casting followed by induction heating sintering. The slurry is poured into a mold to form thin films or sheets, and induction heating provides rapid, uniform heating that sinters the metal particles while maintaining the thin geometry, making thin-walled metal foam production feasible and simple

The patent applies parameter changes by optimizing the slurry viscosity, particle size distribution, and sintering temperature profile to enable successful fabrication of thin films and sheets. The slurry is formulated with specific rheological properties to flow into thin sections uniformly, and the sintering parameters are adjusted to achieve complete bonding without excessive grain growth that would compromise the thin-walled structure