Oxidation Resistance and Residual Strength of Laminated ZrB2-SiC-G Ceramics at 1300

doi:10.15541/jim20160638

Abstract

Abstract:

The laminated ZrB₂-SiC-G ultra high temperature ceramic with different graphite interface layers were successfully prepared by tap-casting-stacking-hot press. The oxidation behavior at 1300℃ for 0.5-10 h and the influence of oxidation time on residual strength at room temperature were studied. In addition, the gain weight along with the change of oxidation time was observed, and phase and morphology were analyzed. The results show that the laminated ZrB₂-SiC-G ultra high temperature ceramic prepared by adding 40vol%ZrB₂ and 10vol% SiC in the graphite interface layer obtains the best mechanical properties with room temperature flexural strength of 670 MPa and the fracture toughness of 13.7 MPa·m^1/2. After 10 h oxidation, the flexural strength is still up to 429 MPa, and the fracture toughness is still up to 10.25 MPa·m^1/2. The excellent residual strength is attributed to the formation of a dense glass layer of SiO₂ on the surface which prevents the internal material from being oxidized.

Key words: ZrB2, Laminated ceramics, oxidation, residual strength

CLC Number:

TG33

LIU Xiao-Yan, WEI Chun-Cheng, NIU Jin-Ye, YANG Zan-Zhong, YU Chang-Xin. Oxidation Resistance and Residual Strength of Laminated ZrB₂-SiC-G
Ceramics at 1300[J]. Journal of Inorganic Materials, 2017, 32(9): 961-966.

Figures/Tables 8

Table1 Composition ratio of each layer in laminated ZrB2-SiC-G ceramics

Sample	Matrix layer	Interface layer
LZS-1	ZrB₂-20vol%SiC	Graphite-20vol%ZrB₂- 10vol% SiC
LZS-2	ZrB₂-20vol%SiC	Graphite-30vol%ZrB₂- 10vol% SiC
LZS-3	ZrB₂-20vol%SiC	Graphite-40vol%ZrB₂- 10vol% SiC

Fig. 1 SEM images of laminated ceramics (a, b) Surface of laminated LZS-3 ceramic; (c, d) Fracture surface of laminated LZS-3 ceramic; (e, f) Fracture surface of laminated LZS-1 ceramic

Fig. 2 XRD patterns of laminated ZrB2-SiC-G ceramic after oxidation for (a) 0.5 h and (b) 10 h

Fig. 3 Plots of weight gain of the laminated ZrB2-SiC-G ceramic at 1300℃

Table2 k values of the laminated ZrB2-SiC-G ceramic after oxidation for 10 h

Sample	LZS-1	LZS-2	LZS-3
k / [(mg·cm^-2)²﹒h^-1]	0.85	0.54	0.42

Fig. 4 SEM images of the surface of laminated LZS-3 ceramic after oxidation at 1300℃ for (a, b) 0.5 h and (c, d)10 h

Fig. 5 SEM images of fracture surface laminated LZS-3 ceramic after oxidation at 1300℃ for (a, b) 0.5 h and (c, d)10 h

Fig. 6 Lexural strength (a) and fracture toughness (b) of laminated ZrB2-SiC-G ceramic after oxidation at 1300℃for different time

References 16

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Oxidation Resistance and Residual Strength of Laminated ZrB₂-SiC-G
Ceramics at 1300

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