层状ZrB2-SiC-G陶瓷在1300℃下的抗氧化性及其残余强度的研

doi:10.15541/jim20160638

摘要/Abstract

摘要：

采用流延-层叠-热压的方法制备了不同石墨界面层的层状ZrB₂-SiC-G超高温陶瓷, 研究其在1300℃下氧化0.5~10 h的氧化行为以及氧化时间对室温残余强度的影响, 观察了增重量随氧化时间的变化, 并对其物相和形貌进行了分析。结果表明, 石墨界面层中添加40vol% ZrB₂和10vol% SiC制备的层状ZrB₂-SiC-G超高温陶瓷, 室温弯曲强度为670 MPa, 断裂韧性为13.7 MPa·m^1/2, 氧化10 h后弯曲强度仍达429MPa, 断裂韧性仍达10.25 MPa·m^1/2, 优异的残余强度是由于表面形成了致密的SiO₂玻璃层而阻止了材料内部被氧化。

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关键词: ZrB2, 层状陶瓷, 氧化, 残余强度

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

中图分类号:

TG33

刘晓燕, 魏春城, 牛金叶, 杨赞中, 于长新. 层状ZrB₂-SiC-G陶瓷在1300℃下的抗氧化性及其残余
强度的研[J]. 无机材料学报, 2017, 32(9): 961-966.

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.

图/表 8

表1 层状ZrB2-SiC-G陶瓷各层的组成配比

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

图1 层状陶瓷的SEM照片

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

图2 层状ZrB2-SiC-G陶瓷1300℃氧化(a) 0.5 h和(b)10 h的XRD图谱

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

图3 层状ZrB2-SiC-G陶瓷在1300℃下的氧化增重曲线图

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

表2 层状ZrB2-SiC-G陶瓷氧化10 h的k值

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

图4 层状LZS-3陶瓷在1300℃下氧化(a, b) 0.5 h和(c, d)10 h的表面SEM照片

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

图5 层状LZS-3陶瓷在1300℃下氧化(a, b) 0.5 h 和(c, d)10 h的断面SEM照片

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

图6 层状ZrB2-SiC-G陶瓷1300℃下氧化不同时间后的弯曲强度(a)和断裂韧性(b)

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

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层状ZrB₂-SiC-G陶瓷在1300℃下的抗氧化性及其残余
强度的研

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

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