A novel ceramic-polymer hybrid composite is fabricated by co-curing lay-up process to combine a carbon nanotube (CNT) reinforced ceramic composite film with a carbon fiber reinforced polymer (CFRP) composite substrate. A transition layer made of non-woven carbon fiber tissues and both ceramic and polymeric matrices are introduced to improve the bonding strength of CNT ceramic composite and CFRP. Volume fraction of CNTs in the CNT ceramic composite is variable from 30% to 60% depending on the CNT preform employed. 6K T300 carbon fiber 2×2 plain weave fabric reinforced bismaleimide (BMI) composites are used as the CFRP substrate. The hybrid composite has good structural integrity with a pull-off bonding strength up to 8.3 MPa. Microstructures are characterized to investigate the bonding mechanism. Ceramic and polymeric matrices are evenly distributed and interlocked each other by the carbon fibers in the transition layer. Carbon fibers in the transition layer bond to the CNT ceramic composite and CFRP tightly with the help of the ceramic or polymeric matrices. Flexural fatigue, heating-cooling thermal fatigue and wet-conditioning test are fulfilled to investigate the structural stability. The hybrid composite developed maintains good properties stability after these tests. Thermal properties of the hybrid composite are studied by both theoretical simulation and experimental method. Micro-hardness test is taken to characterize the surface hardness of the hybrid composite, CFRP and bulk ceramics. Microstructure analysis of the indentation dent confirms that the hybrid composite shares the same mechanical response to micro-hardness test as the bulk ceramics. Sandblasting test in accordance with ASTM C418-12 is applied on both CFRP and the hybrid composite. The CNT ceramic composite layer of the hybrid composite is effective protecting the CFRP substrate from erosions. Microstructure of the sandblasted surfaces is characterized to analyze the failure mode. The erosion resistance mechanism of the hybrid composite is discussed. / A Dissertation submitted to the Materials Science and Engineering Program in partial fulfillment of the requirements for the degree of Doctor of Philosophy. / Spring Semester 2018. / April 9, 2018. / bonding, ceramic matrix composite, CFRP, Hybrid composite / Includes bibliographical references. / Cheryl Xu, Professor Co-Directing Dissertation; Eric Hellstrom, Professor Co-Directing Dissertation; Peng Xiong, University Representative; Richard Liang, Committee Member; Zhibin Yu, Committee Member; Chen Huang, Committee Member.
| Identifer | oai:union.ndltd.org:fsu.edu/oai:fsu.digital.flvc.org:fsu_654728 |
| Contributors | Ju, Licheng (author), Xu, Cheryl (professor co-directing dissertation), Hellstrom, Eric (professor co-directing dissertation), Xiong, Peng (university representative), Liang, Zhiyong (committee member), Yu, Zhibin (committee member), Huang, Chen (committee member), Florida State University (degree granting institution), Graduate School (degree granting college), Program in Materials Science (degree granting departmentdgg) |
| Publisher | Florida State University |
| Source Sets | Florida State University |
| Language | English, English |
| Detected Language | English |
| Type | Text, text, doctoral thesis |
| Format | 1 online resource (106 pages), computer, application/pdf |
Page generated in 0.0014 seconds