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Title:	Development of titanium foam using tapioca starch as spacer through space holder technique
Authors:	Amirhossein Mansourighasri (P48000)
Supervisor:	Norhamidi Muhamad, Prof. Dr.
Keywords:	Composite materials Titanium Foamed materials Universiti Kebangsaan Malaysia -- Dissertations Dissertations, Academic -- Malaysia
Issue Date:	22-Sep-2011
Description:	Cellular metals are new class of materials which attracted researches due to their unique mechanical, thermal, biomedical, electrical and chemical properties. Among the production methods, space holder technique, which is classified among powder metallurgical methods, is promising due to its considerable advantages. The most significant advantages of this method are low cost, better control and the ability of near net shape production. High melting titanium is intensely reactive with atmosphere gases; hence, solid processing techniques seem more stable. In space holder technique, selecting proper spacer plays the most crucial role. In this study, the fabrication of open cellular titanium foams by using an innovative spacer through powder metallurgy was investigated. This study covers examination for feasibility of utilising alternative for the current spacer such as tapioca starch, Purity D starch, Poly methyl methacrylate and corn starch. Among the experimented spacers, the foams that were fabricated using tapioca starch showed the best results, so it was selected as a proper alternative to fabricate titanium foam by space holder technique. Titanium with purity of ≥99.9% and spherical particle size of less than 20µm was used in this study as the metal powder. Tapioca starch with spherical particles in the size range of 100-400 µm was used in the experiment. Tapioca starch-titanium compositions were mixed for more than 1 hour in agate mortar with ratio of 30%-70% wt, 40%-60% wt and 50%-50% wt. The mixture was cold-compacted into a cylindrical mould with pressure of 100 MPa uniaxially. The space holder removal and sintering process were carried out in the vacuum furnace. At fist samples were heated up to 450°C and were kept for 2 hours for removing the spacer and then temperature was raised to 1200 °C for the sintering of titanium powders. The pore morphology and mechanical properties and of fabricated foams were investigated by scanning electron microscopy and compression test respectively. The porosities of the fabricated titanium foams were 64-79%, and the sizes of open cellular pores were 100-300 µm. The observed yield strength of the foams was in the range of 23-41 MPa, and the Young’s modules were 1.6-3.7 GPa. Finally, the XRD results of titanium before and after sintering were studied to ensure that the produced foams featured no oxidation, contamination and formation of new compounds.,Certification of Master's / Doctoral Thesis" is not available
Pages:	112
Call Number:	TA418.9.F6M343 2012 3 tesis
Publisher:	UKM, Bangi
Appears in Collections:	Faculty of Engineering and Built Environment / Fakulti Kejuruteraan dan Alam Bina

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