Microstructural evolution of Li-Ti ferrite/composite braze/Li-Ti ferrite joints reinforced by Bi5(Ti3Fe)O15 whiskers

Panpan Lin; Tiesong Lin; Peng He; Dusan P. Sekulic; Ziyang Xiu; Jiandong Wang

doi:10.1016/j.jeurceramsoc.2016.06.039

Microstructural evolution of Li-Ti ferrite/composite braze/Li-Ti ferrite joints reinforced by Bi₅(Ti₃Fe)O₁₅ whiskers

Panpan Lin, Tiesong Lin, Peng He, Dusan P. Sekulic, Ziyang Xiu, Jiandong Wang

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

14 Scopus citations

Abstract

The composite brazes consisting of (i) Bi₂O₃-B₂O₃-SiO₂ glass and (ii) Li-Ti ferrite powder were used to join the Li-Ti ferrite. The microstructural evolution and resulting mechanical strength of the joint were systematically investigated. Both needle-like and plate-like Bi₅(Ti₃Fe)O₁₅ phases were observed in the joint. With a sufficiently pronounced Ti concentration gradient, the Bi₅(Ti₃Fe)O₁₅ crystal nucleuses evolve into whiskers along the c-axis orientation. Contrary to that, the Bi₅(Ti₃Fe)O₁₅ plates were observed when the Ti concentration gradient was small enough to make the driving force of the preferential growth markedly weaker in comparison to the attraction between the (Bi₂O₂)²⁺ and (A_m₋₁B_mO_3m+1)²⁻ domains in a bismuth layer-perovskite structure. The Bi₅(Ti₃Fe)O₁₅ whiskers having a large size could potentially absorb the fracture force by deflecting or stopping its propagation. The highest shear strength of 81.0 MPa was obtained for the joint with the composite braze containing 10.0 wt% of Li-Ti ferrite powder.

Original language	English
Pages (from-to)	4065-4070
Number of pages	6
Journal	Journal of the European Ceramic Society
Volume	36
Issue number	16
DOIs	https://doi.org/10.1016/j.jeurceramsoc.2016.06.039
State	Published - Dec 1 2016

Bibliographical note

Publisher Copyright:
© 2016

Funding

This research is supported by “ National Natural Science Foundation of China (NSFC, Grant numbers 51275135 , 51474081 and 51475103 )” and “ The Funds for Distinguished Young Scientists of Heilongjiang Province (Grant number JC2015011 )”. One of the authors (DPS) acknowledges a support through the 1000 Foreign Expert Professor Plan.

Funders	Funder number
National Natural Science Foundation of China (NSFC)	51475103, 51275135, 51474081
China National Funds for Distinguished Young Scientists	JC2015011

Keywords

Bi(TiFe) O whisker
Bi(TiFe)O plate
Composite braze
Joint strength
Li-Ti ferrite
Microstructure

ASJC Scopus subject areas

Ceramics and Composites
Materials Chemistry

Access to Document

10.1016/j.jeurceramsoc.2016.06.039

Cite this

@article{90e18846d70c497fa75b74804367e761,

title = "Microstructural evolution of Li-Ti ferrite/composite braze/Li-Ti ferrite joints reinforced by Bi5(Ti3Fe)O15 whiskers",

abstract = "The composite brazes consisting of (i) Bi2O3-B2O3-SiO2 glass and (ii) Li-Ti ferrite powder were used to join the Li-Ti ferrite. The microstructural evolution and resulting mechanical strength of the joint were systematically investigated. Both needle-like and plate-like Bi5(Ti3Fe)O15 phases were observed in the joint. With a sufficiently pronounced Ti concentration gradient, the Bi5(Ti3Fe)O15 crystal nucleuses evolve into whiskers along the c-axis orientation. Contrary to that, the Bi5(Ti3Fe)O15 plates were observed when the Ti concentration gradient was small enough to make the driving force of the preferential growth markedly weaker in comparison to the attraction between the (Bi2O2)2+ and (Am−1BmO3m+1)2− domains in a bismuth layer-perovskite structure. The Bi5(Ti3Fe)O15 whiskers having a large size could potentially absorb the fracture force by deflecting or stopping its propagation. The highest shear strength of 81.0 MPa was obtained for the joint with the composite braze containing 10.0 wt% of Li-Ti ferrite powder.",

keywords = "Bi(TiFe) O whisker, Bi(TiFe)O plate, Composite braze, Joint strength, Li-Ti ferrite, Microstructure",

author = "Panpan Lin and Tiesong Lin and Peng He and Sekulic, {Dusan P.} and Ziyang Xiu and Jiandong Wang",

year = "2016",

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T1 - Microstructural evolution of Li-Ti ferrite/composite braze/Li-Ti ferrite joints reinforced by Bi5(Ti3Fe)O15 whiskers

AU - Lin, Panpan

AU - Lin, Tiesong

AU - He, Peng

AU - Sekulic, Dusan P.

AU - Xiu, Ziyang

AU - Wang, Jiandong

PY - 2016/12/1

Y1 - 2016/12/1

N2 - The composite brazes consisting of (i) Bi2O3-B2O3-SiO2 glass and (ii) Li-Ti ferrite powder were used to join the Li-Ti ferrite. The microstructural evolution and resulting mechanical strength of the joint were systematically investigated. Both needle-like and plate-like Bi5(Ti3Fe)O15 phases were observed in the joint. With a sufficiently pronounced Ti concentration gradient, the Bi5(Ti3Fe)O15 crystal nucleuses evolve into whiskers along the c-axis orientation. Contrary to that, the Bi5(Ti3Fe)O15 plates were observed when the Ti concentration gradient was small enough to make the driving force of the preferential growth markedly weaker in comparison to the attraction between the (Bi2O2)2+ and (Am−1BmO3m+1)2− domains in a bismuth layer-perovskite structure. The Bi5(Ti3Fe)O15 whiskers having a large size could potentially absorb the fracture force by deflecting or stopping its propagation. The highest shear strength of 81.0 MPa was obtained for the joint with the composite braze containing 10.0 wt% of Li-Ti ferrite powder.

AB - The composite brazes consisting of (i) Bi2O3-B2O3-SiO2 glass and (ii) Li-Ti ferrite powder were used to join the Li-Ti ferrite. The microstructural evolution and resulting mechanical strength of the joint were systematically investigated. Both needle-like and plate-like Bi5(Ti3Fe)O15 phases were observed in the joint. With a sufficiently pronounced Ti concentration gradient, the Bi5(Ti3Fe)O15 crystal nucleuses evolve into whiskers along the c-axis orientation. Contrary to that, the Bi5(Ti3Fe)O15 plates were observed when the Ti concentration gradient was small enough to make the driving force of the preferential growth markedly weaker in comparison to the attraction between the (Bi2O2)2+ and (Am−1BmO3m+1)2− domains in a bismuth layer-perovskite structure. The Bi5(Ti3Fe)O15 whiskers having a large size could potentially absorb the fracture force by deflecting or stopping its propagation. The highest shear strength of 81.0 MPa was obtained for the joint with the composite braze containing 10.0 wt% of Li-Ti ferrite powder.

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KW - Microstructure

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