无机材料学报 ›› 2023, Vol. 38 ›› Issue (5): 569-576.DOI: 10.15541/jim20220548
吴爽(), 苟燕子(), 王永寿, 宋曲之, 张庆雨, 王应德()
收稿日期:
2022-09-19
修回日期:
2022-11-10
出版日期:
2022-11-16
网络出版日期:
2022-11-16
通讯作者:
苟燕子, 副研究员. E-mail: y.gou2012@hotmail.com;作者简介:
吴 爽(1996-), 女, 博士研究生. E-mail: alanwu37@163.com
基金资助:
WU Shuang(), GOU Yanzi(), WANG Yongshou, SONG Quzhi, ZHANG Qingyu, WANG Yingde()
Received:
2022-09-19
Revised:
2022-11-10
Published:
2022-11-16
Online:
2022-11-16
Contact:
GOU Yanzi, associate professor. E-mail: y.gou2012@hotmail.com;About author:
WU Shuang(1996-), female, PhD candidate. E-mail: alanwu37@163.com
Supported by:
摘要:
高结晶近化学计量比SA型SiC纤维以其优异的耐温性, 在新一代航空发动机和高超声速飞行器等领域得到广泛应用。对比国产第二代SiC纤维(F-II), 本工作研究了第三代SA型SiC纤维(F-III)高温热处理前后的微观结构演变和拉伸强度及断裂行为。结果表明, F-III纤维主要由β-SiC晶粒(~200 nm)和少量游离碳组成, F-II纤维则由β-SiC晶粒(~5 nm)、游离碳和SiCxOy无定形相组成。与F-II纤维相比, F-III纤维具有更大的晶粒尺寸与孔隙, 室温下的拉伸强度较低。但经1800 ℃热处理后, F-III纤维结构和强度基本保持不变, 而F-II纤维由于发生了SiCxOy相的分解和晶粒长大, 强度明显降低。SA型SiC纤维的耐高温性能优异, 可归因于纤维组成结构上的高结晶、大晶粒和低碳氧含量。
中图分类号:
吴爽, 苟燕子, 王永寿, 宋曲之, 张庆雨, 王应德. 高温热处理对国产KD-SA型SiC纤维组成结构与力学性能的影响[J]. 无机材料学报, 2023, 38(5): 569-576.
WU Shuang, GOU Yanzi, WANG Yongshou, SONG Quzhi, ZHANG Qingyu, WANG Yingde. Effect of Heat Treatment on Composition, Microstructure and Mechanical Property of Domestic KD-SA SiC Fibers[J]. Journal of Inorganic Materials, 2023, 38(5): 569-576.
Parameter | F-II | F-II-1800 ℃ | F-III | F-III-1800 ℃ |
---|---|---|---|---|
C/Si | 1.34 | 1.42 | 1.08 | 1.08 |
Al content/ (%, in mass) | / | / | <1.00 | <1.00 |
O content/ (%, in mass) | 0.98 | 0.53 | 0.07 | 0.05 |
Diameter/μm | 12.0 | 11.9 | 9.9 | 9.9 |
Density/ (g·cm-3) | 2.72 | 2.66 | 3.08 | 3.09 |
Tensile strength/ GPa | 2.7 | 0.9 | 1.8 | 1.8 |
Elastic modulus/GPa | 260 | 207 | 372 | 366 |
表1 热处理前后SiC纤维的组成和基本性能
Table 1 Composition and general properties of SiC fibers before and after heat treatment
Parameter | F-II | F-II-1800 ℃ | F-III | F-III-1800 ℃ |
---|---|---|---|---|
C/Si | 1.34 | 1.42 | 1.08 | 1.08 |
Al content/ (%, in mass) | / | / | <1.00 | <1.00 |
O content/ (%, in mass) | 0.98 | 0.53 | 0.07 | 0.05 |
Diameter/μm | 12.0 | 11.9 | 9.9 | 9.9 |
Density/ (g·cm-3) | 2.72 | 2.66 | 3.08 | 3.09 |
Tensile strength/ GPa | 2.7 | 0.9 | 1.8 | 1.8 |
Elastic modulus/GPa | 260 | 207 | 372 | 366 |
图1 (a)F-II, (b)F-II-1800 ℃、(c)F-III 和(d)F-III-1800 ℃ 纤维的Si2p的XPS图谱
Fig. 1 Si2p XPS spectra of (a) F-II, (b) F-II-1800 ℃, (c)F-III, and (d)F-III-1800 ℃ fibers
Sample | D Band | G Band | ID/IG | La/nm | ||
---|---|---|---|---|---|---|
Position/cm-1 | FWHM | Position/cm-1 | FWHM | |||
F-II | 1356.3 | 112.5 | 1599.8 | 122.7 | 1.39 | 13.8 |
F-II-1800 ℃ | 1351.3 | 59.9 | 1586.8 | 63.2 | 1.09 | 17.6 |
F-III | 1352.9 | 79.9 | 1590.1 | 89.0 | 1.12 | 17.2 |
F-III-1800 ℃ | 1354.3 | 64.9 | 1593.0 | 72.8 | 1.18 | 16.3 |
表2 纤维中自由碳的拉曼峰信息
Table 2 Raman characteristics of free carbon phase of the fibers
Sample | D Band | G Band | ID/IG | La/nm | ||
---|---|---|---|---|---|---|
Position/cm-1 | FWHM | Position/cm-1 | FWHM | |||
F-II | 1356.3 | 112.5 | 1599.8 | 122.7 | 1.39 | 13.8 |
F-II-1800 ℃ | 1351.3 | 59.9 | 1586.8 | 63.2 | 1.09 | 17.6 |
F-III | 1352.9 | 79.9 | 1590.1 | 89.0 | 1.12 | 17.2 |
F-III-1800 ℃ | 1354.3 | 64.9 | 1593.0 | 72.8 | 1.18 | 16.3 |
图3 (a~c)F-II, (d~h)F-II-1800 ℃, (i~l)F-III, and (m~p)F-III-1800 ℃纤维的SEM形貌照片
Fig. 3 SEM morphologies of (a-c) F-II, (d-h) F-II-1800 ℃, (i-l) F-III, and (m-p) F-III-1800 ℃ fibers
图4 (a~e) F-II、(f~j) F-II-1800 ℃和(k~o) F-III-1800 ℃纤维的TEM和HRTEM照片
Fig. 4 TEM and HRTEM images of (a-e) F-II fibers, (f-j)F-II-1800 ℃ fibers, and (k-o) F-III-1800 ℃ fibers
图6 (a)F-II-1800 ℃纤维皮芯结构示意图和(b)F-III纤维热稳定性的示意图
Fig. 6 Schematic diagram of (a) formation process of skin-core structure of F-II-1800 ℃and (b) thermal stability of F-III fibers
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