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Related Concept Videos

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Dissolution kinetics, an essential aspect of oral drug delivery, is significantly influenced by the drug's particle size. According to the Noyes-Whitney dissolution model, the dissolution rate correlates directly with the drug's surface area. The larger the surface area, the higher the drug's solubility in water, leading to a faster drug dissolution rate. Reducing particle size increases the effective surface area, enhancing the dissolution process. Micronization and nanosizing are...
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Changes in polymorphic forms can significantly influence the bioavailability of poorly soluble drugs. Although the FDA defines pharmaceutical equivalence based on having the same active ingredient, dosage form, and route of administration, it does not automatically disqualify products with different polymorphic forms. This means two products with different polymorphs can still be deemed pharmaceutically equivalent. However, polymorphic differences can affect properties like wettability,...
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Effects of Particle Size Distribution with Efficient Packing on Powder Flowability and Selective Laser Melting

Zachary Young1,2, Minglei Qu2,3, Meelap Michael Coday1,2,3

  • 1Department of Mechanical and Aerospace Engineering, Missouri University of Science and Technology, Rolla, MO 65409, USA.

Materials (Basel, Switzerland)
|February 15, 2022
PubMed
Summary
This summary is machine-generated.

Particle size distribution significantly impacts powder flowability and selective laser melting (SLM) quality in additive manufacturing. Non-linear effects of dense packing ratios reduce flowability, affecting part repeatability and quality.

Keywords:
additive manufacturingflowabilityparticle size distributionpowder bed fusion

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Area of Science:

  • Materials Science
  • Manufacturing Engineering
  • Powder Metallurgy

Background:

  • Powder bed additive manufacturing (AM) faces challenges in part repeatability and quality due to uncertainties in powder spreading and bed formation.
  • Particle size distribution (PSD) is a critical feedstock parameter influencing powder behavior and process outcomes.

Purpose of the Study:

  • To investigate the non-linear influence of particle size distribution (PSD) on powder flowability and the selective laser melting (SLM) process.
  • To identify how PSD-induced uncertainties affect the quality and repeatability of additively manufactured parts using Ti6Al4V.

Main Methods:

  • Utilized a revolution powder analyzer to measure powder flowability, including avalanche angle and break energy, across various PSDs.
  • Employed in-situ high-speed X-ray imaging to observe melt pool dynamics during the SLM process.
  • Analyzed the relationship between PSD, powder flowability, and build height in SLM.

Main Results:

  • Flowability is non-linearly affected by PSD; dense packing ratios significantly decrease flowability.
  • Powder beds formed from powders with dense packing ratios exhibit increased build height during laser melting.
  • Specific PSDs impact melt pool dynamics and overall part quality in SLM.

Conclusions:

  • Understanding the effects of PSD on powder flowability and SLM is crucial for mitigating process uncertainties.
  • Optimizing PSD can enhance feedstock powder performance and improve the quality of additively manufactured components.
  • This research provides insights for developing strategies to control powder characteristics for better AM outcomes.