Enhancing the tensile properties of SiC composites by a two-dimensional CNT film. Issue 3 (1st February 2021)

• Record Type: Journal Article
• Authors: Chen, Jiasheng; Yan, Yuekai; Mei, Hui; Han, Daoyang; Cheng, Laifei
• Is Part Of: Ceramics international. Volume 47:Issue 3(2021)
• Page Start: 4111
• Page End: 4117
• Publication Date: 2021-02-01
• Subjects: CNT film -- Chemical vapor infiltration -- Tensile properties -- Pyrolytic carbon interfacial layer -- SiC ceramic; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.09.287
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: Tensile properties of silicon carbide (SiC) ceramics were improved by introducing a two-dimensional carbon nanotube film (CNTf ) with excellent mechanical properties. CNTf was first assembled by floating catalyst chemical vapor deposition (CCVD); then CNTf with the pyrolytic carbon interfacial layer (CNTf /PyC) was prepared by chemical vapor infiltration (CVI). Afterwards, SiC was infiltrated into the CNTf and CNTf /PyC preforms by the CVI process, to prevent the uneven dispersion and agglomeration of CNT and damage caused by high temperature sintering. Two composites (CNTf /SiC, CNTf /PyC/SiC) were ultimately prepared, and their microstructures and tensile properties were studied. The results show that the tensile strengths of CNTf /PyC, CNTf /SiC and CNTf /PyC/SiC are 716 ± 60, 153 ± 11, and 155 ± 12 MPa, respectively, which illustrates that SiC ceramic reinforced by CNTf exhibits excellent tensile properties. Besides, the porosities of CNTf /SiC and CNTf /PyC/SiC are 17.4% and 22.6%, respectively. CNTf /PyC/SiC shows higher porosity but better tensile properties, indicating that the PyC interfacial layer enhances the tensile properties of CNTf /SiC composite. In addition, the strengthening and toughening mechanisms are also discussed.