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. 2024 Mar 3;17(5):1182.
doi: 10.3390/ma17051182.

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Chang Zou  1   2 , Yangxin Ou  1 , Weiliang Zhou  3 , Zhiqiang Li  3 , Pu Zheng  3 , Xingzhong Guo  1   2
Affiliations

Microstructure and Properties of Hot Pressing Sintered SiC/Y3Al5O12 Composite Ceramics for Dry Gas Seals

Chang Zou et al. Materials (Basel). .

Abstract

Silicon carbide (SiC) ceramics with high bending strength were prepared by hot pressing sintering (HPS) with yttrium aluminum garnet (Y3Al5O12, YAG) as sintering additive, and the effects of YAG content and sintering temperature on the sintering behavior, microstructure and mechanical properties of SiC ceramics were investigated in detail. The uniform distribution of YAG to form a liquid phase and the driving force provided by hot pressing sintering decrease the sintering temperature, improve the densification of SiC ceramics, and refine the crystal size. By means of suitable sintering conditions with the additional amount of YAG of 5 wt%, the sintering temperature of 1950 °C and a pressure of 30 MPa, the resultant SiC/YAG composite ceramics possesses high sintering and mechanical properties with the relative density of 98.53%, the bending strength of 675 MPa, the Vickers hardness of up to 17.92 GPa, and the elastic modulus of 386 GPa. The as-prepared SiC/YAG composite ceramics are promisingly used as the dry gas seal materials in the centrifugal compressors.

Keywords: ceramic material; hot pressing sintering; microstructure; silicon carbide; yttrium aluminum garnet.

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Conflict of interest statement

Weiliang Zhou, Zhiqiang Li, Pu Zheng were employed by the company Zhejiang Dongxin New Material Technology Co., Ltd. The remaining authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.

Figures

Figure 1
Figure 1
Photo (a) and structure diagram (b) of hot pressing sintering furnace.
Figure 2
Figure 2
SEM photos of SiC/YAG composite powder. (a) 5 wt% YAG; (b) 10 wt% YAG.
Figure 3
Figure 3
EDS of SiC/YAG composite powder (5 wt% YAG). (a) Si; (b) C; (c) Al; (d) Y; (e) O.
Figure 4
Figure 4
XRD patterns of SiC/YAG composite ceramics (5 wt% YAG) after hot pressing sintered at different temperatures (a) and refined XRD data of SiC/YAG composite ceramics sintered at 1950 °C (b).
Figure 5
Figure 5
SEM photos of the fracture surface of SiC/YAG composite ceramics after hot pressing sintered at different YAG contents and sintering temperatures. (a) 5 wt% YAG, 1900 °C; (b) 5 wt% YAG, 1950 °C; (c) 5 wt% YAG, 2000 °C; (d) 10 wt% YAG, 1900 °C; (e) 10 wt% YAG, 1950 °C; (f) 10 wt% YAG, 2000 °C.
Figure 6
Figure 6
Hardness (a) and bending strength (b) of SiC/YAG composite ceramics after hot pressing sintered at different YAG contents and sintering temperatures.
Figure 7
Figure 7
Elastic modulus (a) and fracture toughness (b) of SiC/YAG composite ceramics after hot pressing sintered at different YAG contents and sintering temperatures.
Figure 8
Figure 8
Crack deflecting of SiC/YAG composite ceramic (5 wt% YAG) after hot pressing sintered at 1950 °C.
See this image and copyright information in PMC

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