Metal Additive Powder in Sheets for Laser Sintering
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Solution Overview
Problem
Current additive manufacturing systems, particularly those using selective laser melting (SLM), are limited to printing with single materials at a time, leading to inefficiencies, safety concerns, and lengthy clean-up times when switching between materials.
Innovation Solution
The introduction of a metal powder-polymer composite sheet, known as Metal Additive Powder in Sheets (MAPS), which replaces loose metal powders. This composite sheet is fed onto the build area using rollers and vaporizes the polymer while the metal powders are sintered or fused using a laser beam.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If loose metal powder is used in SLM, then manufacturing flexibility is maintained, but safety hazards increase due to powder suspension and combustibility
Solution Approach 1:
The patent uses composite sheets combining metal powder with a binder material to create a stable, non-powdery form that eliminates safety hazards while maintaining manufacturing flexibility. The composite structure allows the metal powder to be contained and handled safely as a sheet material rather than loose powder.
Solution Approach 2:
The patent employs thin sheet form factor for the metal powder delivery medium. This thin film approach replaces loose powder with a controlled, flexible sheet that can be precisely positioned and fed into the build chamber without creating airborne suspension or combustion risks.
2Adaptability or versatility
If multiple powder materials are stored in a single LPBF system, then material versatility is improved, but clean-up time increases dramatically to up to two working days
Solution Approach 1:
The patent segments different metal powder materials into separate, pre-formed sheets. Each sheet is a discrete unit that can be independently removed and replaced, eliminating the need for extensive chamber clean-up when switching materials. The segmentation allows for quick material changes by simply swapping sheets rather than cleaning residual powder from the chamber.
3Productivity
If roller mechanism is used to feed composite sheets, then build time is reduced by eliminating powder recoating, but device complexity increases
Solution Approach 1:
The patent extracts and eliminates the complex powder recoating mechanism from traditional SLM systems by using pre-formed composite sheets. The roller feeding mechanism is a simpler alternative that directly delivers material layers without requiring the complex powder spreading, leveling, and recoating equipment needed in conventional powder-based systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The MAPS approach enhances safety, reduces clean-up time, enables multi-material printing in a single chamber, and decreases overall build-time by eliminating the need for powder recoating, while also allowing for control of stiffness and flexibility through cross-section homogeneity.
Implementation Method 1
During the MAPS manufacturing process, the polymer is vaporised
Implementation Method 2
the metal powders are sintered or fused together when a laser beam is focused on the target area
Implementation Method 3
the metal powders are sintered or fused together when a laser beam is focused on the target area
Data Source
AI summary
A recyclable and flexible metal powder composite sheet, the sheet comprising at least one metal powder and at least one polymer, wherein the polymer fraction of the composite sheet is non-homologous in cross-section.