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Preparation of SiC Ceramics by Laminated Object Manufacturing and Pressureless Sintering

H. Zhong, H. Zhong, X. Yao, Y. Zhu, J. Zhang, D. Jiang, J. Chen, Z. Chen, X. Liu, Z. Huang

Journal of Ceramic Science and Technology, Vol. 6, No. 2 (2015), pp. 133-140

DOI: 10.4416/JCST2014-00049

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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.

Keywords

LOM, SiC, tape casting, binder removal, pressureless sintering, mechanical properties

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