The influence of PMMA content on the properties of 316L stainless steel MIM compact

Citation
Ma. Omar et al., The influence of PMMA content on the properties of 316L stainless steel MIM compact, J MATER PR, 113(1-3), 2001, pp. 477-481
Citations number
8
Categorie Soggetti
Material Science & Engineering
Journal title
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY
ISSN journal
09240136 → ACNP
Volume
113
Issue
1-3
Year of publication
2001
Pages
477 - 481
Database
ISI
SICI code
0924-0136(20010615)113:1-3<477:TIOPCO>2.0.ZU;2-U
Abstract
The influence of the PMMA content in a composite binder comprising PMMA and PEG on the moulding, debinding and sintering behaviour of injection moulde d samples of 316L stainless steel powder has been investigated. The PEGs co mponent of the binder is readily soluble in water, so that, after leaching, a network of open pores is provided to facilitate the extraction of the PM MA by pyrolysis. This has been shown to lead to a reduction in overall debi nding time. It is shown in the present study that reduction in the PMMA con tent allows injection moulding to be carried out at a lower temperature, wh ile having the unfavourable consequences of reducing the stiffness and the green and brown strengths of the mouldings. It was also found that the moul dings had to be left in the die for a longer period before ejection because the temperature at which the binder stiffens was significantly reduced. It was shown that reducing the PMMA content of the binder enhanced the rate o f removal of the PEGs during the leaching. The sintered densities of the mo uldings were found to increase as the PMMA content increased as, consequent ly, did the hardness. (C) 2001 Elsevier Science B.V. All rights reserved.