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In this work, various backbone binders were used in wax-based binder system to formulate zirconia parts by ceramic injection molding (CIM). The effect of different backbone binders on the molding, debinding, and sintering behaviors was investigated. After blending process, the feedstock using multi-polymer components exhibited more homogeneous structure compared with that using the mono-polymer ones due to the synergistic effect of multi-polymers. During solvent debinding, some defects such as “slumping” and “peeling” appeared in the parts containing ethylene-vinyl acetate copolymer (EVA), but they were not found in the parts with other thermal polymers. Also, as for the parts after sintering, the one using low density polyethylene (LDPE) and high density polyethylene (HDPE) as backbone binders presented a more uniform microstructure with finer zirconia grains among all the investigated compositions, and thus obtained the highest flexural strength (~949 MPa) and relative density (~98.9%).


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Effects of different backbone binders on the characteristics of zirconia parts using wax-based binder system via ceramic injection molding

Show Author's information Jiaxin WENaZhipeng XIEb( )Wenbin CAOaXianfeng YANGc
School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100084, China
State Key Laboratory of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
College of Physics and Electronics Science, Changsha University of Science & Technology, Changsha 410014, China

Abstract

In this work, various backbone binders were used in wax-based binder system to formulate zirconia parts by ceramic injection molding (CIM). The effect of different backbone binders on the molding, debinding, and sintering behaviors was investigated. After blending process, the feedstock using multi-polymer components exhibited more homogeneous structure compared with that using the mono-polymer ones due to the synergistic effect of multi-polymers. During solvent debinding, some defects such as “slumping” and “peeling” appeared in the parts containing ethylene-vinyl acetate copolymer (EVA), but they were not found in the parts with other thermal polymers. Also, as for the parts after sintering, the one using low density polyethylene (LDPE) and high density polyethylene (HDPE) as backbone binders presented a more uniform microstructure with finer zirconia grains among all the investigated compositions, and thus obtained the highest flexural strength (~949 MPa) and relative density (~98.9%).

Keywords:

ceramic injection molding (CIM), ZrO2, backbone binders, solvent debinding, sintering
Received: 19 June 2016 Revised: 22 August 2016 Accepted: 25 August 2016 Published: 23 December 2016 Issue date: December 2016
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Publication history

Received: 19 June 2016
Revised: 22 August 2016
Accepted: 25 August 2016
Published: 23 December 2016
Issue date: December 2016

Copyright

© The author(s) 2016

Acknowledgements

This work was financially supported by National Natural Science Foundation of China (Grant No. 51572035).

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