Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system

In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than...

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Main Authors:	Muhammad Hussain Ismail, Bram, Martin, Barbosa, Ana Paula Cysne, Kohl, Manuel, Davies, Hywel A., Todd, Iain
Format:	Article
Language:	English
Published:	Universiti Kebangsaan Malaysia 2013
Online Access:	http://journalarticle.ukm.my/6688/ http://journalarticle.ukm.my/6688/ http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf

id	ukm-6688
recordtype	eprints
spelling	ukm-66882016-12-14T06:41:55Z http://journalarticle.ukm.my/6688/ Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system Muhammad Hussain Ismail, Bram, Martin Barbosa, Ana Paula Cysne Kohl, Manuel Davies, Hywel A. Todd, Iain In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than 22 μm and powder loading of 69.5 vol. % was used. The binder consisted of a water soluble binder system, mainly polyethylene glycol (PEG), with two different backbone binders, namely polyethylene 520 (PE 520) and poly-methyl- methacrylate (PMMA). The latter was used in the form of a powder and as an emulsion. Green parts were prepared by warm-press the feedstock into a cylindrical shape. The samples were then leached in warm water, thermally debound in Argon and finally, vacuum sintered at 1240°C for 10 h. The experimental results indicate that the oxygen content in the as-sintered condition increased to almost double than that of the powder state (from 0.08 to 0.14 - 0.16 wt. %) and the carbon increased by one third to half (from 0.06 to 0.08 - 0.09 wt. %). This consequently resulted in a shift of the phase transformation temperature to lower values and consequently broadened the reversible austenite to martensite transformation. The uptake of oxygen and carbon during the process led to the formation of the well-known Ti4Ni2Ox and TiC precipitate phases which were evident from grey-scale images of back-scattered SEM. Universiti Kebangsaan Malaysia 2013-12 Article PeerReviewed application/pdf en http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf Muhammad Hussain Ismail, and Bram, Martin and Barbosa, Ana Paula Cysne and Kohl, Manuel and Davies, Hywel A. and Todd, Iain (2013) Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system. Sains Malaysiana, 42 (12). pp. 1769-1773. ISSN 0126-6039 http://www.ukm.my/jsm/
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Kebangasaan Malaysia
building	UKM Institutional Repository
collection	Online Access
language	English
description	In this work, the effects of backbone polymer in the binder system mixed with pre-alloyed NiTi powder, on impurity contents, phase transformation temperatures and microstructures were investigated. A spherical gas-atomised pre-alloyed NiTi powder (50.3 at. %Ni) with a mean particle size of less than 22 μm and powder loading of 69.5 vol. % was used. The binder consisted of a water soluble binder system, mainly polyethylene glycol (PEG), with two different backbone binders, namely polyethylene 520 (PE 520) and poly-methyl- methacrylate (PMMA). The latter was used in the form of a powder and as an emulsion. Green parts were prepared by warm-press the feedstock into a cylindrical shape. The samples were then leached in warm water, thermally debound in Argon and finally, vacuum sintered at 1240°C for 10 h. The experimental results indicate that the oxygen content in the as-sintered condition increased to almost double than that of the powder state (from 0.08 to 0.14 - 0.16 wt. %) and the carbon increased by one third to half (from 0.06 to 0.08 - 0.09 wt. %). This consequently resulted in a shift of the phase transformation temperature to lower values and consequently broadened the reversible austenite to martensite transformation. The uptake of oxygen and carbon during the process led to the formation of the well-known Ti4Ni2Ox and TiC precipitate phases which were evident from grey-scale images of back-scattered SEM.
format	Article
author	Muhammad Hussain Ismail, Bram, Martin Barbosa, Ana Paula Cysne Kohl, Manuel Davies, Hywel A. Todd, Iain
spellingShingle	Muhammad Hussain Ismail, Bram, Martin Barbosa, Ana Paula Cysne Kohl, Manuel Davies, Hywel A. Todd, Iain Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
author_facet	Muhammad Hussain Ismail, Bram, Martin Barbosa, Ana Paula Cysne Kohl, Manuel Davies, Hywel A. Todd, Iain
author_sort	Muhammad Hussain Ismail,
title	Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_short	Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_full	Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_fullStr	Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_full_unstemmed	Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system
title_sort	phase transformation temperatures (ppts) and microstructure of moulded niti alloy using a water soluble binder system
publisher	Universiti Kebangsaan Malaysia
publishDate	2013
url	http://journalarticle.ukm.my/6688/ http://journalarticle.ukm.my/6688/ http://journalarticle.ukm.my/6688/1/12_Muhammad_Hussain_Ismail.pdf
first_indexed	2023-09-18T19:47:36Z
last_indexed	2023-09-18T19:47:36Z
_version_	1777406004362739712

Phase transformation temperatures (PPTs) and microstructure of moulded NiTi alloy using a water soluble binder system

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