Oxidation Behavior of SiCf/SiC Composites Modified by Layered-Y2Si2O7 in Wet Oxygen Environment

doi:10.15541/jim20180590

Abstract

Abstract:

SiC_f/SiC composites modified by layered Y₂Si₂O₇were presented in this research. Layered Y₂Si₂O₇ was transformed from yttrium oxide by chemical vapor infiltration process in SiC fiber preform, in which yttrium oxide was generated by the solution impregnation and pyrolysis method. Oxidation behavior of the layered-Y₂Si₂O₇modified SiC_f/SiC composites was studied in the wet oxygen environment at 1400 ℃, showing that Y₂Si₂O₇ can concentrate on the oxidation surface to form a protective layer during the oxidation process. The bending strengths of SiC_f/SiC composites with one layer or three layers of Y₂Si₂O₇ remain 60.38% and 71.93%, respectively, after the oxidation for 80 h. In contrast, it is only 50.11% for SiC_f/SiC composites without Y₂Si₂O₇. Therefore, layered distribution of Y₂Si₂O₇ significantly improves the oxidation resistance of SiC_f/SiC composites in wet oxygen environment.

Key words: ceramic composites, rare-earth silicate, oxidation

CLC Number:

TQ174

WANG Peng, WANG Qing-Lei, ZHANG Xiang-Yu, YANG Jin-Shan, ZHOU Hai-Jun, HU Jian-Bao, DING Yu-Sheng, DONG Shao-Ming. Oxidation Behavior of SiC_f/SiC Composites Modified by Layered-Y₂Si₂O₇ in Wet Oxygen Environment[J]. Journal of Inorganic Materials, 2019, 34(8): 904-908.

Figures/Tables 6

Fig. 1 Micro-region XRD patterns of samples (a) C0, C1, C2 and P1, and (b) Y2O3 before and after CVI

Fig. 2 SEM images of samples (a) P1 and (b) C1 with insets showing EDS analysis of the white region in sample P1 and C1

Fig. 3 SEM images of the cutting surface of the composites Before oxidation: Sample (a) C0, (b) C1, (c) C2. After Oxidation: Sample (d) C0, (e) C1, (f) C2

Fig. 4 Oxidation models of SiCf/SiC-Y2Si2O7 in wet oxygen

Fig. 5 (a) Mechanical strength and (b) strength retention of the composites after oxidation for different time

	C₀	C₁	C₂
Porosity/%	8.69±0.27	11.49±0.93	13.63±0.35
Density/(g?cm^-3)	2.75±0.02	2.60±0.02	2.50±0.01

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Oxidation Behavior of SiC_f/SiC Composites Modified by Layered-Y₂Si₂O₇ in Wet Oxygen Environment

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