A Preliminary Study on Cell Wall Architecture of Titanium Foams
- PDF / 462,307 Bytes
- 6 Pages / 612 x 792 pts (letter) Page_size
- 80 Downloads / 178 Views
1188-LL02-04
A Preliminary Study on Cell Wall Architecture of Titanium Foams Nihan Tuncer*, Luc Salvo+, Eric Maire† and Gursoy Arslan* *Anadolu University, Dept. of Mater. Sci. & Eng., Iki Eylul Campus, 26555, Eskisehir, Turkey. †
INSA Lyon MATEIS lab, Bat St Exupery 25 Av Capelle, 69621, Villeurbanne cedex, France.
+
INPG Grenoble, Laboratoire SIMaP/GPM2, BP 46 38402 Saint Martin d'Heres, France.
ABSTRACT Bio-inspired architectures, especially metallic foams, have been receiving an increasing interest for the last 10 years due to their unusual mechanical properties. Among commonly dealt foamed metals, like aluminum and steel, titanium possesses a distinctive place because of its high strength-to-weight ratio, excellent corrosion resistance and biocompatibility. In this study, Ti foams were produced by a very simple and common method, sintering under inert atmosphere with fugitive space holder. Removal of the space holder was conducted by dissolution in hot deionized water which makes it possible to minimize contamination of Ti. Sintering of remaining Ti skeleton at 1300 ºC offered a wide range of properties and cost savings. The effects of the processing parameters such as sintering temperature and powder characteristics on the 3D foam architecture were investigated by using X-ray microtomography (µ-CT). Use of bimodal Ti powders caused a decrease in final theoretical density when compared to the ones prepared with the same amount of space holder but with monomodal Ti powders. It was also observed that the use of bimodal Ti powders decreased compressive strength, by introducing pores into the cell walls, when compared to the ones having the same theoretical density. INTRODUCTION Although the vast majority of research on the processing and characterisation of metallic foams has focused on melt processing of Al and steel foams [1-4], Ti and its alloys are very attractive since they combine unique properties such as high strength-to-weight ratio, excellent corrosion resistance and biocompatibility. These properties offer special application areas including biomedical applications and aircraft and spacecraft engineering [5]. As in all branches of material science, it is important to link physical properties of cellular solids to their density and complex microstructure, in order to understand how such properties can be optimized for a given application. In literature, there exist simple predictions of mechanical properties which are mainly based on the porosity amount and on an assumption concerning the architecture of the solid phase [6]. However, very often, certain amounts of discrepancy exist between the predicted and experienced results which arise from underestimation of real architectural affects. In studies carried out so far, certain tendencies in compressive strength and energy absorption regarding to Ti foams were determined [7]. However, it is important to explain the reason of the deviation from ideality and what happens if the parameters other than porosity such as the internal architecture were furt
Data Loading...
