PAEK Powder Composition for Lower-Temperature Laser Sintering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing polyaryl ether ketone (PAEK) powders used in laser sintering processes undergo significant ageing at high construction temperatures, leading to reduced recyclability and diminished mechanical properties of the sintered pieces due to prolonged exposure, making it difficult to reuse the unsintered powder.
Innovation Solution
A pulverulent composition with specific endothermic peak temperatures and enthalpy profiles, comprising PAEK powders with distinct thermal properties, allows for sintering at lower construction temperatures, enhancing recyclability and maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high construction temperature is used in laser sintering, then sintering effectiveness is improved, but powder ageing accelerates and recyclability deteriorates
Solution Approach 1:
The patent changes the thermal parameters of the PAEK powder by introducing a specific endothermic peak at 200-280°C through controlled heat treatment. This parameter modification enables the powder to undergo phase transition at lower temperatures, allowing sintering to proceed effectively at reduced construction temperatures (below 280°C) while minimizing powder ageing and maintaining recyclability.
Solution Approach 2:
The patent applies a preliminary heat treatment to the PAEK powder before sintering to create the characteristic endothermic peak. This preliminary action modifies the powder's thermal properties in advance, enabling it to sinter effectively at lower temperatures during the actual sintering process while preventing excessive ageing of the unsintered powder.
2Reliability
If construction temperature is reduced, then powder ageing is minimized and recyclability is improved, but sintering effectiveness may deteriorate
Solution Approach 1:
The patent modifies the thermal parameters of the PAEK powder by creating a specific endothermic peak at 200-280°C through controlled heat treatment. This parameter change enables the powder to undergo phase transition at lower temperatures, allowing sintering to proceed effectively at reduced construction temperatures while maintaining both recyclability and sintering effectiveness.
Solution Approach 2:
The endothermic peak at 200-280°C acts as an intermediary thermal event that facilitates the sintering process at lower temperatures. This intermediate phase transition serves as a mediator between the heating process and the final sintering, enabling effective bonding at temperatures that would otherwise be insufficient while protecting the powder from excessive ageing.
3Ease of manufacture
If conventional PAEK powder is used, then manufacturing simplicity is maintained, but mechanical properties of sintered pieces deteriorate due to porosity
Solution Approach 1:
The patent changes the thermal parameters of the PAEK powder by introducing a specific endothermic peak at 200-280°C. This parameter modification enables the powder to sinter more effectively at lower temperatures, producing denser sintered pieces with reduced porosity and improved mechanical properties while maintaining manufacturing simplicity.
Solution Approach 2:
The patent replaces the need for high-temperature sintering (which causes porosity and mechanical property degradation) with a controlled low-temperature sintering process utilizing the endothermic peak. This substitution of the thermal mechanism enables effective sintering at lower temperatures, producing denser materials with better mechanical properties.
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 composition enables sintering at lower temperatures, reducing powder ageing, improving recyclability, and producing objects with good mechanical properties and dimensional accuracy.
Implementation Method 1
The composition has at least a first endothermic peak and a second endothermic peak, the first endothermic peak having a peak temperature strictly greater than 280° C. and the second endothermic peak having a peak temperature equal to a value of 200° C. to 280° C.
Implementation Method 2
a process for the electromagnetic radiation-mediated layer-by-layer sintering construction of objects
Implementation Method 3
the PAEK powder of a layer under construction is heated in a construction environment to a temperature Tc, known as the 'construction temperature' or 'bath temperature'
Data Source
AI summary
The invention relates to a pulverulent composition comprising a powder based on at least one polyaryl ether ketone, said composition having at least a first endothermic peak and a second endothermic peak, the first endothermic peak having a peak temperature strictly greater than 280° C., and the second endothermic peak having a peak temperature equal to a value of 200° C. to 280° C.; the endothermic peaks are measured on a thermogram obtained by differential scanning calorimetry, according to the standard ISO 11357-3: 2018, on first heating, using a temperature ramp of 20° C./minute. The invention also relates to a method for the electromagnetic radiation-mediated layer-by-layer sintering construction of a three-dimensional object from the pulverulent composition, to a method for determining the minimum construction temperature to be used, and also to objects that may be manufactured via this construction process.