Research on the interfacial structure and property improvement of the Cfiber/2Si-B-3C-N ceramic matrix composite

Journal Article · Wed Aug 15 00:00:00 EDT 2018 · Materials Characterization

DOI:https://doi.org/10.1016/J.MATCHAR.2018.05.024· OSTI ID:22832989

Zhang, Pengfei ^[1]; Jia, Dechang; Yang, Zhihua ^[2]; Yang, Bin; Wang, Guangxin ^[1]

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1. School of Materials Science and Engineering, Henan University of Science and Technology, Luoyang 471023 (China)
2. Institute for Advanced Ceramics, Harbin Institute of Technology, Harbin 150080 (China)

Highlights: • The C{sub fiber}/2Si-B-3C-N composite with nice properties was successfully prepared. • ZrO{sub 2} promotes the densification process, homogeneous nucleation and grain growth. • The interface reaction in the composite was well controlled by the addition of ZrO{sub 2}. • The damage to carbon fiber was largely avoided by the addition of ZrO{sub 2}. - Abstract: A mixture of the mechanically alloyed 2Si-B-3C-N powder and short carbon fiber was hot pressed at 1800 °C for 30 mins in nitrogen. Careful investigation to the prepared C{sub fiber}/2Si-B-3C-N ceramic matrix composite revealed that the composite was very difficult to be densified. Heterogeneous nucleation, abnormal grain growth and severe interface reaction occurred on the fiber surface or between the fiber and the ceramic matrix, leading to a small density and weak mechanical properties of the composite. For the prepared composite without any additive, the relative density, flexural strength, elastic modulus and fracture toughness is 71.7%, 64.6 MPa, 14.7 GPa and 1.47 MPa·m{sup 1/2}, respectively. The average size of the SiC grains close to and far away from the carbon fiber is 249.10 nm and 50.45 nm, respectively. However, with the addition of ZrO{sub 2} (7.5 mol%), the above mentioned phenomenons are changed noticeably, and those properties are significantly increased to 88.5%, 112.4 MPa, 111.1 GPa and 2.94 MPa·m{sup 1/2}, respectively. At the same time, the SiC grains close to or far away from the carbon fiber almost have the same average size of about 448.21 nm, and almost no interface reaction occurs. It shows that the addition of ZrO{sub 2} not only facilitates the sintering and densification process, but also depresses the interface reaction, promotes the homogeneous nucleation and grain growth, and hence significantly improves the mechanical properties of the C{sub fiber}/2Si-B-3C-N composite. This interesting finding is favorable for the preparation of carbon fiber reinforced ceramic matrix composite, which requires both a large relative density and well controlled interface reaction.

• OSTI ID: 22832989
• Journal Information: Materials Characterization, Vol. 142; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1044-5803
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BORON COMPOUNDS
CARBON COMPOUNDS
CARBON FIBERS
CERAMICS
COMPOSITE MATERIALS
DAMAGE
DENSITY
FLEXURAL STRENGTH
FRACTURE PROPERTIES
GRAIN GROWTH
INTERFACES
MATRIX MATERIALS
NITROGEN COMPOUNDS
NUCLEATION
PRESSES
PRESSURE RANGE GIGA PA
PRESSURE RANGE MEGA PA
SILICON COMPOUNDS
SINTERING
SURFACES
ZIRCONIUM OXIDES