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Characterizing flowability of metal powders
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
KTH, School of Industrial Engineering and Management (ITM), Materials Science and Engineering.
2019 (English)Independent thesis Basic level (degree of Bachelor), 10 credits / 15 HE creditsStudent thesis
Abstract [en]

Powder metallurgy is a growing field with much potential. The core purpose and problem in this work is attempting to describe and understand what and how metal powder properties impact powder flowability.

Several powder flow experiments have been performed on eight different metal powders with varying size and of material types to examine correlations and seeing what parameters are important for a well flowing metal powder. Experiments performed consists of hall flow, tap density, angle of repose and a more complex Rheometer analysis.

The results found display plenty correlations between different experiments with some deviations as expected due to the nature of occurring errors. The results are all displayed in tables comparing the different metal powders for all experiments.

The powder with the best flowability (highly free flowing) scored best across all experiments and tests indicating all tests as significant. A well and free flowing powder is characterized by low values in cohesion, angle of repose, specific energy, etc.

Abstract [sv]

Pulvermetallurgi är en växande industri med stor potential. Syftet samt problemet med detta arbete är att försöka beskriva och förstå vilka pulveregenskaper som är betydande för flödet och hur dessa egenskaper påverkar hur pulvret flödar.

Flera olika experiment har utförts på åtta olika metallpulver, av varierande sorter material och pulverstorlek, har utförts för att undersöka samband och se vilka pulveregenskaper som är viktiga för ett metallpulver ska ha eftertraktade flödesegenskaper. Utförda experiment består av Hall flöde, tappdensitet, rasvinkel (angle of repose) samt en mer komplex Rheometer analys.

Resultaten visar många samband mellan olika experiment och metallpulver med en del avvikelser som väntat på grund av flertalet felkällor. Resultaten för alla pulver och experiment uppvisas i stapelgrafer för enkel överblick och jämförelse.

Metallpulvret som påvisade bäst flödesegenskaper (fritt flödande pulver) rankades som bästa pulver i varje experiment vilket indikerar att alla experiment är relevanta. Ett väl flödande metallpulver indikeras av låga värden på kohesion, rasvinkel, specifik energi osv.

Place, publisher, year, edition, pages
2019. , p. 30
Series
TRITA-ITM-EX ; 2019:524
Keywords [en]
Powder Metallurgy
National Category
Metallurgy and Metallic Materials
Identifiers
URN: urn:nbn:se:kth:diva-254754OAI: oai:DiVA.org:kth-254754DiVA, id: diva2:1335126
Educational program
Master of Science in Engineering - Materials Design and Engineering
Supervisors
Examiners
Available from: 2019-07-09 Created: 2019-07-03 Last updated: 2019-07-09Bibliographically approved

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