Mechanical Properties of Reaction-bonded Si3N4/SiC Composite Ceramics

doi:10.3724/SP.J.1077.2014.13469

Abstract

Abstract:

With Y₂O₃:Al₂O₃(A 2:3; B 3:1 total amount 15wt%) as sintering additives and SiC as the second phase, high flexural strength Si₃N₄/SiC composite ceramics were prepared via nitridation of Si powder. The phase composition, relative density, microstructure as well as mechanical properties were investigated. The experimental results showed that the α→β-Si₃N₄ phase transformation could be completed at 1700℃ for 2 h with sintering additives A or B. With the sintering additive A and 5wt% SiC addition, the maximum relative density of 94.8% and maximum flexural strength of 521.8 MPa were obtained for the Si₃N₄/SiC composite ceramics. As compared with the specimen without SiC addition which flexural strength was 338.7 MPa, flexural strength of the above mentioned Si₃N₄/SiC composite ceramics was improved by 54.1%. SiC powder can effectively improve the mechanical properties of the specimen and the fracture of Si₃N₄/SiC composite ceramics followed the typical intergranular fractural mode.

Key words: reaction-bonded, Si₃N₄/SiC composite ceramics, sintering additives, SiC content

CLC Number:

TQ174

HU Hai-Long, YAO Dong-Xu, XIA Yong-Feng, ZUO Kai-Hui, ZENG Yu-Ping. Mechanical Properties of Reaction-bonded Si₃N₄/SiC Composite Ceramics[J]. Journal of Inorganic Materials, 2014, 29(6): 594-598.

Figures/Tables 6

Fig. 1 XRD patterns of different Si3N4/SiC composite ceramics

Fig. 2 Effect of SiC content on the relative density of Si3N4/SiC composite ceramics

Fig. 3 SEM fracture surfaces of Si3N4/SiC composite ceramics prepared with additive A and different contents of SiC

Fig. 4 SEM fracture surfaces of Si3N4/SiC composite ceramics prepared with B additive and different contents of SiC

Fig. 5 (a) SEM image of fracture surface of the sintered sample A5 (Inset is the corresponding TEM image); (b) SEM image of fracture surface of the sintered sample B0

Fig. 6 Effect of SiC content on the flexural strength of Si3N4/SiC composite ceramics with additives A or B

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Mechanical Properties of Reaction-bonded Si₃N₄/SiC Composite Ceramics

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