Effects of Al2O3 coating induced structural and mechanical changes of C/C composites
Jia, Jiangang1,2; Zhang, Bo1; Liu, Diqiang1; Liu, Shunwei1; Ji, Genshun2; Ji, Ruifang1
2020-03-25
Source PublicationJOURNAL OF ALLOYS AND COMPOUNDS
ISSN0925-8388
Volume818
AbstractDifferent C/C composites, identified as C-f/C, C-Al2O3/C, C-1600/C and C1600-Al2O3/C, were fabricated by condensation of different treated 3D needle-punched carbon fiber preforms through a thermal gradient chemical vapor infiltration (TG-CVI) method. Effects of high temperature treatment and Al2O3 coating of the carbon fiber preforms on matrix texture and mechanical properties of C/C composites were investigated. SL PyC is obtained for C-f/C and C-1600/C, which preforms are without Al2O3 coating. Whereas the texture of carbon matrix for C-Al2O3/C, and C1600-Al2O3/C changes to RL under the same deposition conditions, indicating that Al2O3 coating layer significantly affects the texture of carbon matrix. Heat treatment of the carbon fiber preforms at 1600 degrees C for 4 h obviously increase the toughness of the C/C composites. The fracture toughness increased by 226% from 0.938 MPa/m(2) for C-f/C to 3.061 MPa/m(2) for C1600-Al2O3/C. The significant toughness increasing is attributed to the unique fracture mode for C1600-Al2O3/C, where a hollow "cylindrical" PyC matrix is pulled out and a corresponding big hole is left with a central fiber in it. The flexural strength, however, is mainly affected by the final density of the C/C composites. (C) 2019 Elsevier B.V. All rights reserved.
KeywordC/C composites Interface coating layer Al2O3 Matrix texture Fracture toughness
DOI10.1016/j.jallcom.2019.152847
Indexed BySCI
Language英语
Funding ProjectNational Natural Science Foundation of China[51461029] ; Gansu Province science and technology major projects[1602GKDD012]
WOS Research AreaChemistry ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectChemistry, Physical ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
WOS IDWOS:000506166900046
PublisherELSEVIER SCIENCE SA
Document Type期刊论文
Identifierhttp://ir.lut.edu.cn/handle/2XXMBERH/64142
Collection材料科学与工程学院
Corresponding AuthorJia, Jiangang
Affiliation1.Lanzhou Univ Technol, Sch Mat Sci & Engn, Lanzhou 730050, Peoples R China
2.State Key Lab Adv Proc & Recycling Nonferrous Met, Lanzhou 730050, Peoples R China
First Author AffilicationColl Mat Sci & Engn
Corresponding Author AffilicationColl Mat Sci & Engn
First Signature AffilicationColl Mat Sci & Engn
Recommended Citation
GB/T 7714
Jia, Jiangang,Zhang, Bo,Liu, Diqiang,et al. Effects of Al2O3 coating induced structural and mechanical changes of C/C composites[J]. JOURNAL OF ALLOYS AND COMPOUNDS,2020,818.
APA Jia, Jiangang,Zhang, Bo,Liu, Diqiang,Liu, Shunwei,Ji, Genshun,&Ji, Ruifang.(2020).Effects of Al2O3 coating induced structural and mechanical changes of C/C composites.JOURNAL OF ALLOYS AND COMPOUNDS,818.
MLA Jia, Jiangang,et al."Effects of Al2O3 coating induced structural and mechanical changes of C/C composites".JOURNAL OF ALLOYS AND COMPOUNDS 818(2020).
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