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Preparation of SiC Ceramics by Laminated Object Manufacturing and Pressureless Sintering
H. Zhong1,2, X. Yao2, Y. Zhu2, J. Zhang2, D. Jiang2, J. Chen2, Z. Chen2, X. Liu2, Z. Huang2
1 Graduate University of the Chinese Academy of Sciences, Beijing 100049, China
2 State Key Laboratory of High Performance Ceramics and Superfine Microstructures, Shanghai Institute of Ceramics, Chinese Academy of Sciences, Shanghai 200050, China
received November 11, 2014, received in revised form January 24, 2015, accepted Febuary 20, 2015
Vol. 6, No. 2, Pages 133-140 DOI: 10.4416/JCST2014-00049
Abstract
In this paper, laminated object manufacturing (LOM) and pressureless sintering were applied to obtain complex-shaped SiC ceramic articles. The SiC green tapes measuring 0.15 mm in thickness used for LOM were prepared by means of organic-solvent-based tape casting. The influences of the binder content, plasticizer/binder ratio and solid loading on the tape properties were investigated and optimized. The binder removal and pressureless sintering processes were studied and optimized to obtain high-quality SiC samples. The relationships between the mechanical properties of the sintered body and the solid loading of green tape were studied. The final part with a relative density of 98.16 % can be obtained with a bending strength, hardness, toughness and elastic modulus of 402 ± 23 MPa, 19.86 ± 0.71 GPa, 3.32 ± 0.29 MPa m1/2 and 393 ± 41 GPa respectively. The result shows that LOM is suitable for the manufacture of SiC products with complex shape and beneficial for the design and small batch fabrication of complex-shaped ceramic parts.
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Keywords
LOM, SiC, tape casting, binder removal, pressureless sintering, mechanical properties
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