Titanium with controllable pore fractions by thermoreversible gelcasting of TiH2

Kendra A. Erk; David C. Dunand; Kenneth R. Shull

doi:10.1016/j.actamat.2008.06.035

Titanium with controllable pore fractions by thermoreversible gelcasting of TiH₂

Kendra A. Erk, David C. Dunand, Kenneth R. Shull^*

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

78 Scopus citations

Abstract

Thermoreversible gelcasting, a near-net-shape processing technique, is demonstrated here for titanium. The gelcasting system is composed of TiH₂ particles suspended in a triblock copolymer gel that behaves as a viscous liquid above 56 °C and an elastic solid at room temperature, a temperature-dependent transition that is fully reversible when solvent is present. Organic pyrolysis to remove the gel followed by vacuum sintering to densify the Ti powders (produced by decomposition of the hydride) results in titanium with near full density and low contamination. Incorporation of polypropylene and poly(methyl methacrylate) space-holder particles into the gel results in titanium with controlled porosities up to 44 vol.% and with low contamination. These foams exhibit tailorable stiffness and strength, together with excellent compressive ductility and energy absorption.

Original language	English (US)
Pages (from-to)	5147-5157
Number of pages	11
Journal	Acta Materialia
Volume	56
Issue number	18
DOIs	https://doi.org/10.1016/j.actamat.2008.06.035
State	Published - Oct 2008

Funding

This study is supported by a National Science Foundation Graduate Research Fellowship (K.A.E.), by the Northwestern University Materials Research Center (K.A.E. and K.R.S.), and the National Science Foundation through Grant DMR-0505772 (D.C.D.).

Keywords

Foams
Mechanical properties
Porous material
Powder processing
Titanium hydride

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2008.06.035

Cite this

@article{ea7c893e428449c99b25d1248ba347dc,

title = "Titanium with controllable pore fractions by thermoreversible gelcasting of TiH2",

abstract = "Thermoreversible gelcasting, a near-net-shape processing technique, is demonstrated here for titanium. The gelcasting system is composed of TiH2 particles suspended in a triblock copolymer gel that behaves as a viscous liquid above 56 °C and an elastic solid at room temperature, a temperature-dependent transition that is fully reversible when solvent is present. Organic pyrolysis to remove the gel followed by vacuum sintering to densify the Ti powders (produced by decomposition of the hydride) results in titanium with near full density and low contamination. Incorporation of polypropylene and poly(methyl methacrylate) space-holder particles into the gel results in titanium with controlled porosities up to 44 vol.% and with low contamination. These foams exhibit tailorable stiffness and strength, together with excellent compressive ductility and energy absorption.",

keywords = "Foams, Mechanical properties, Porous material, Powder processing, Titanium hydride",

author = "Erk, {Kendra A.} and Dunand, {David C.} and Shull, {Kenneth R.}",

note = "Funding Information: This study is supported by a National Science Foundation Graduate Research Fellowship (K.A.E.), by the Northwestern University Materials Research Center (K.A.E. and K.R.S.), and the National Science Foundation through Grant DMR-0505772 (D.C.D.). ",

year = "2008",

month = oct,

doi = "10.1016/j.actamat.2008.06.035",

language = "English (US)",

volume = "56",

pages = "5147--5157",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Acta Materialia Inc",

number = "18",

}

TY - JOUR

T1 - Titanium with controllable pore fractions by thermoreversible gelcasting of TiH2

AU - Erk, Kendra A.

AU - Dunand, David C.

AU - Shull, Kenneth R.

N1 - Funding Information: This study is supported by a National Science Foundation Graduate Research Fellowship (K.A.E.), by the Northwestern University Materials Research Center (K.A.E. and K.R.S.), and the National Science Foundation through Grant DMR-0505772 (D.C.D.).

PY - 2008/10

Y1 - 2008/10

N2 - Thermoreversible gelcasting, a near-net-shape processing technique, is demonstrated here for titanium. The gelcasting system is composed of TiH2 particles suspended in a triblock copolymer gel that behaves as a viscous liquid above 56 °C and an elastic solid at room temperature, a temperature-dependent transition that is fully reversible when solvent is present. Organic pyrolysis to remove the gel followed by vacuum sintering to densify the Ti powders (produced by decomposition of the hydride) results in titanium with near full density and low contamination. Incorporation of polypropylene and poly(methyl methacrylate) space-holder particles into the gel results in titanium with controlled porosities up to 44 vol.% and with low contamination. These foams exhibit tailorable stiffness and strength, together with excellent compressive ductility and energy absorption.

AB - Thermoreversible gelcasting, a near-net-shape processing technique, is demonstrated here for titanium. The gelcasting system is composed of TiH2 particles suspended in a triblock copolymer gel that behaves as a viscous liquid above 56 °C and an elastic solid at room temperature, a temperature-dependent transition that is fully reversible when solvent is present. Organic pyrolysis to remove the gel followed by vacuum sintering to densify the Ti powders (produced by decomposition of the hydride) results in titanium with near full density and low contamination. Incorporation of polypropylene and poly(methyl methacrylate) space-holder particles into the gel results in titanium with controlled porosities up to 44 vol.% and with low contamination. These foams exhibit tailorable stiffness and strength, together with excellent compressive ductility and energy absorption.

KW - Foams

KW - Mechanical properties

KW - Porous material

KW - Powder processing

KW - Titanium hydride

UR - http://www.scopus.com/inward/record.url?scp=53049092737&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=53049092737&partnerID=8YFLogxK

U2 - 10.1016/j.actamat.2008.06.035

DO - 10.1016/j.actamat.2008.06.035

M3 - Article

AN - SCOPUS:53049092737

SN - 1359-6454

VL - 56

SP - 5147

EP - 5157

JO - Acta Materialia

JF - Acta Materialia

IS - 18

ER -