Reminder for Naotaka’s Prelim Seminar—see below

From: Son, Rosemary E
Sent: Thursday, May 04, 2017 8:40 AM
To: 'msefaculty-list@ecn.purdue.edu' <msefaculty-list@ecn.purdue.edu>; 'msegradstudent-list@ecn.purdue.edu' <msegradstudent-list@ecn.purdue.edu>; 'mseposdoc-list@ecn.purdue.edu' <mseposdoc-list@ecn.purdue.edu>
Cc: 'Naotaka Ogura' <nogura@purdue.edu>; Cline, Vicki L. <vicline@purdue.edu>; Son, Rosemary E <son39@purdue.edu>
Subject: Seminar Notice for Naotaka Ogura's Preliminary Exam, May 12, 8:00 a.m., in ARMS 3115, "Gas-Solid Magnesiothermic Reduction of Titanium Oxide into Titanium"

Please consider attending the following:

MATERIALS ENGINEERING

SEMINAR

“Gas-Solid Magnesiothermic Reduction of Titanium Oxide into Titanium”

By

Naotaka Ogura

Purdue MSE Ph.D. Preliminary Exam

Advisor: Professor Kenneth Sandhage

ABSTRACT

Titanium exhibits high strength to weight ratio, corrosion resistance and biocompatibility, which made it a common material in our daily lives. Nanocrystalline and ultrafine-grained titanium are found to have strength enhancement and ductility improvement. One of the other interesting expectations of nanoporous titanium is an induction of osteogenic differentiation. However, it is difficult to produce such nanoporous titanium in desired shape with current techniques.

One approach to satisfy this challenge is the shape preserving microstructural conversion of TiO₂ with arbitrary shape into porous titanium via gas/solid magnesiothermic reduction. Titanium replicas with nanoscale porosity will be produced via a three-step chemical process. First, a titanium substrate will be thermally oxidized in air to form a thin, uniform, continuous TiO₂ scale of desired thickness. The substrate will then be exposed to magnesium gas to convert the TiO₂ scale into a nanocrystalline MgO-Ti composite scale, via the following displacement reaction, 2Mg (g) + TiO₂ (s) = 2MgO (s) + Ti (s). Finally, MgO will be selectively dissolved to yield a nanoporous, nanocrystalline titanium scale on external surfaces of the substrate. Papers about the hydrogen reduction of metal oxide particle, and hydrogen assisted magnesiothermic reduction of titanium oxide will be covered in the presentation, to understand the kinetics and the mechanism of gas/solid magnesiothermic reduction of TiO₂.

Date: Friday, May 12, 2017

Time: 8:00 A.M.

Place: ARMS 3115