期刊
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
卷 41, 期 5, 页码 3045-3050出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.jeurceramsoc.2020.05.032
关键词
UHTCMC; Carbon fibres; Mechanical properties; Microstructure; Self-Healing
资金
- European Union's Horizon 2020 Research and innovation programme [685594]
The microstructure and mechanical properties of two different Cf/ZrB2-SiC composites reinforced with continuous PyC coated PAN-derived fibers or uncoated pitch-derived fibers were compared. It was found that coated PAN-derived fibers provided higher strengths and damage tolerance due to a higher degree of fiber pull-out, but also resulted in a less homogeneous microstructure. On the other hand, the weaker fiber/matrix interface in coated bundles led to lower interlaminar shear, off-axis strength, and ablation resistance compared to uncoated pitch-derived fibers.
In this paper the microstructure and mechanical properties of two different Cf/ZrB2-SiC composites reinforced with continuous PyC coated PAN-derived fibres or uncoated pitch-derived fibres were compared. Pitch-derived carbon fibres showed a lower degree of reaction with the matrix phase during sintering compared to PyC/PAN-derived fibres. The reason lies in the different microstructure of the carbon. The presence of a coating for PAN-derived fibres was found to be essential to limit the reaction at the fibre/matrix interface during SPS. However, coated bundles were more difficult to infiltrate, resulting in a less homogeneous microstructure. As far as the mechanical properties are concerned, specimens reinforced with coated PAN-derived fibres provided higher strengths and damage tolerance than uncoated pitch-derived fibres, due to the higher degree of fibre pull-out. On the other hand, the weaker fibre/matrix interface resulted in lower interlaminar shear, off-axis strength and ablation resistance.
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