Authors: Eduard Hryha Henrik Borgström Karin Sterky Lars Nyborg
Publish Date: 2014/05/25
Volume: 118, Issue: 2, Pages: 695-704
Abstract
Binders present an important part of the powder metallurgy technology as they are vital to provide efficient powder agglomeration and/or lubrication during shaping At the same time they have to be easily removed from the compacts during initial stages of sintering without any harmful effect for the base material as well as for the environment Therefore behavior of gelatin as a binder for stainless and toolsteel gasatomised powder compacts was studied by thermal analysis and electron microscopy Thermal analysis showed that peak massloss occurred in the range between 340 and 370 °C depending on the base powder and heating rate Risk for base powder oxidation at temperatures below 425 °C was detected Based on the obtained results it is recommended to perform debinding at ~425 °C after applying a heating rate of around 75 °C min−1 Only in this way efficient enough binder removal can be obtained concurrently to avoiding base powder oxidationPart of this work was done in the frame of project work performed by Yoann de Rancourt during his diploma work at Chalmers University Therefore his contribution to this paper is greatly acknowledged Metec Technologies AB is greatly acknowledged for providing the material for analysis and scientific discussion during writing the paper
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