Final answer:
In Selective Laser Sintering, the amount of thermally damaged powder that can be partially reused usually revolves around 50%. This percentage can fluctuate based on various factors such as material type and printing conditions. The careful management of this powder is vital for maintaining product quality and cost-effectiveness.
Step-by-step explanation:
In the process of Selective Laser Sintering (SLS), the amount of powder that is thermally damaged and can be partially reused varies. A significant portion of the powder does not melt and can be recycled; however, during the printing process, a fraction of the powder typically degrades because of the high temperatures involved. The exact percentage of reusability can depend on the machine, the material being sintered, and the specific printing conditions, but generally, industry standards suggest that only about 50% of the unused powder can be safely mixed with fresh powder for reuse in new prints. The degradation is due to thermal and oxidative stresses that cause changes in the molecular weight and crystallinity of the thermoplastic powders, potentially impacting the final product's mechanical properties.
The management of this powder is an important aspect of SLS printing economy and part of the broader field of manufacturing engineering. Recycling of powder reduces waste and costs, but it requires careful consideration to maintain the quality of printed parts. Consistent testing and quality control are essential to ensure that the recycled powder will not negatively affect the sintering process and the properties of the final product.