TY - JOUR
T1 - Combining direct ink writing with reactive melt infiltration to create architectured thermoelectric legs
AU - Prӧschel, Alexander
AU - Lun Lau, Miu
AU - Post Guillen, Donna
AU - Dunand, David C.
N1 - Funding Information:
This work was supported through the Idaho National Laboratory (INL) Laboratory Directed Research & Development (LDRD) Program under DOE Idaho Operations Office Contract DE-AC07-05ID14517. This research made use of the resources of the High Performance Computing Center at INL, which is supported by the Office of Nuclear Energy of the U.S. Department of Energy and the Nuclear Science User Facilities under Contract No. DE-AC07-05ID14517. The authors gratefully acknowledge M.M. Al Malki and H.Y. Xie as well as Profs. G.J. Snyder and M.G. Kanatzidis for assistance with, and access to, thermoelectric measurement equipment. Additionally, we wish to thank Dr. Dennis Tucker (INL) for his guidance on thermoelectric materials synthesis and laboratory procedures as well as John Misiaszek who aided in the LPBF synthesis of TiNiSn. This work made use of the EPIC facility of Northwestern University’s NUANCE Center, MatCI Facility and J.B. Cohen X-Ray Diffraction Facility which have received support from the MRSEC program of the National Science Foundation (DMR-1720139) at the Materials Research Center of Northwestern University, the IIN and the Soft and Hybrid Nanotechnology Experimental (SHyNE) Resource (NSF ECCS-1542205.)
Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/1/1
Y1 - 2024/1/1
N2 - We present a new additive-reactive synthesis method where inks – cast into molds or 3D-additively extruded into architectured shapes – are reacted into intermetallic thermoelectric compounds. The new method, as demonstrated for equiatomic TiNiSn, combines: (i) extrusion printing (or casting) of inks containing Ni and Ti powders, (ii) debinding and reactive sintering to form a porous NiTi network, (iii) network infiltration with liquid Sn and subsequent reaction to synthesize the TiNiSn phase. Thin plates, created through this method, show high phase purity and low residual porosity. A thermoelectric figure of merit zT = 0.47 ± 0.05 is achieved at 800 K, within the broad range of values (zT = 0.3–1.0) reported for TiNiSn created via traditional powder hot-pressing methods. Layered TiNiSn microlattices – after 3D ink-extrusion printing and infiltration – exhibit high relative densities and minimal undesirable secondary phase content, with a Seebeck coefficient on par with the ink-cast TiNiSn plates, demonstrating that thermoelectric legs with far-ranging architectural freedom can be created additively with this novel reactive manufacturing method. Numerous other thermoelectric (and other) compounds, currently limited to basic geometries due to brittleness, are amenable to this new method based on a sequence of reactive sintering/infiltration of cast or ink-extruded precursors.
AB - We present a new additive-reactive synthesis method where inks – cast into molds or 3D-additively extruded into architectured shapes – are reacted into intermetallic thermoelectric compounds. The new method, as demonstrated for equiatomic TiNiSn, combines: (i) extrusion printing (or casting) of inks containing Ni and Ti powders, (ii) debinding and reactive sintering to form a porous NiTi network, (iii) network infiltration with liquid Sn and subsequent reaction to synthesize the TiNiSn phase. Thin plates, created through this method, show high phase purity and low residual porosity. A thermoelectric figure of merit zT = 0.47 ± 0.05 is achieved at 800 K, within the broad range of values (zT = 0.3–1.0) reported for TiNiSn created via traditional powder hot-pressing methods. Layered TiNiSn microlattices – after 3D ink-extrusion printing and infiltration – exhibit high relative densities and minimal undesirable secondary phase content, with a Seebeck coefficient on par with the ink-cast TiNiSn plates, demonstrating that thermoelectric legs with far-ranging architectural freedom can be created additively with this novel reactive manufacturing method. Numerous other thermoelectric (and other) compounds, currently limited to basic geometries due to brittleness, are amenable to this new method based on a sequence of reactive sintering/infiltration of cast or ink-extruded precursors.
KW - Additive manufacturing
KW - Half-Heusler
KW - Liquid phase sintering
KW - Thermoelectric power generation
UR - http://www.scopus.com/inward/record.url?scp=85179778653&partnerID=8YFLogxK
U2 - 10.1016/j.cej.2023.147845
DO - 10.1016/j.cej.2023.147845
M3 - Article
AN - SCOPUS:85179778653
SN - 1385-8947
VL - 479
JO - Chemical engineering journal
JF - Chemical engineering journal
M1 - 147845
ER -