Polyamide Sinter Powder Broadens Laser Sintering Window
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Solution Overview
Problem
Existing sinter powders for selective laser sintering have a reduced sintering window, leading to warpage issues in produced shaped bodies, which limits their usability and requires frequent recycling.
Innovation Solution
A sinter powder composition comprising at least one semicrystalline polyamide, nylon-6I/6T, and a polyaryl ether, which broadens the sintering window, reducing warpage and enhancing recyclability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If existing sinter powder compositions are used, then the sintering window is reduced, but warpage of shaped bodies increases
Solution Approach 1:
The patent applies composite materials by combining polyamide 6I/6T with specific additives (polyethylene glycol with Mn=1000 and zinc stearate) to create a sinter powder composition that achieves both a broad sintering window and minimal warpage. The composite formulation allows the material to maintain structural integrity during sintering while enabling precise dimensional control of the shaped bodies.
2Reliability
If existing sinter powder compositions are used, then warpage occurs frequently, but recyclability of sinter powder is reduced
Solution Approach 1:
The patent implements discarding and recovering by formulating a sinter powder composition that maintains high recyclability through careful selection of additives that do not degrade during thermal cycling. The polyethylene glycol and zinc stearate components allow the powder to be reused multiple times without significant loss of sintering performance or increase in warpage, enabling efficient recovery and reuse of the sinter powder.
3Productivity
If sintering window is reduced, then production efficiency decreases, but process complexity increases due to frequent recycling
Solution Approach 1:
The patent applies parameter changes by optimizing the chemical composition of the sinter powder, specifically adjusting the ratios of polyamide 6I/6T, polyethylene glycol (Mn=1000), and zinc stearate to achieve ideal sintering characteristics. This compositional parameter optimization broadens the sintering window and reduces warpage, thereby improving production efficiency and simplifying the overall manufacturing process.
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 proposed sinter powder composition significantly reduces warpage in shaped bodies, improves elongation at break, and maintains high recyclability even after thermal aging, resulting in improved mechanical properties and process efficiency.
Implementation Method 1
selectively exposing a polymer powder in a chamber to a laser beam. The powder melts, and the molten particles coalesce and solidify again.
Implementation Method 2
The powder melts, and the molten particles coalesce and solidify again.
Implementation Method 3
The powder melts, and the molten particles coalesce and solidify again.
Data Source
AI summary
The present invention relates to a process for producing a shaped body by selective laser sintering of a sinter powder (SP). The sinter powder (SP) comprises at least one semicrystalline polyamide, at least one nylon-6I/6T and at least one polyaryl ether. The present invention further relates to a shaped body obtainable by the process of the invention and to the use of a polyaryl ether in a sinter powder (SP) for broadening the sintering window (WSP) of the sinter powder (SP).