A simple way to prepare a precursor for ZrC–SiC ceramics
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- 作者：Yong Li ; Si'an Chen ; Xin Ma ; Guangde Li ; Haifeng Hu…
- 刊名：Journal of Materials Science
- 出版年：2016
- 出版时间：June 2016
- 年：2016
- 卷：51
- 期：11
- 页码：5160-5169
- 全文大小：1,861 KB
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Si’an Chen (1)
Xin Ma (2)
Guangde Li (3)
Haifeng Hu (1)
Yudi Zhang (1)
1. Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, 410073, Hunan Province, China
2. School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing, 10083, China
3. The Fifth Research Institute, Equipment Academy of the Rocket Force, Beijing, 100094, China - 刊物类别：Chemistry and Materials Science
- 刊物主题：Chemistry
Materials Science
Characterization and Evaluation Materials
Polymer Sciences
Continuum Mechanics and Mechanics of Materials
Crystallography
Mechanics - 出版者：Springer Netherlands
- ISSN：1573-4803
文摘
For cost reduction and process simplification, a homogenous liquid precursor for zirconium carbide (ZrC)–SiC ceramics was prepared by blending Zr(OC4H9)4, divinylbenzene, and polycarbosilane (PCS). The mixture was cross-linked at 150 °C, decomposed to ZrO2, carbon, and SiC at 800 °C, and then ZrO2 and carbon reacted with each other via carbo-thermal reaction at 1500 °C to form ZrC–SiC ceramics that contained few ZrO2. The ZrO2 content was reduced either by increasing the temperature from 1500 to 1700 °C, or by extending the holding time from 1 to 2 h. Increasing the content of PCS in the precursor not only benefited the carbo-thermal reaction but also caused the generation of free carbon in the pyrolyzed ceramic products. When the precursor contained the optimal content of PCS, the ceramics fabricated from it had a Si/Zr molar ratio of 1. C/ZrC–SiC composites were successfully fabricated via precursor infiltration and pyrolysis using the precursor. The flexural strength and fracture toughness of the composites were 212 ± 44 MPa and 13.8 ± 1.6 MPa m1/2, respectively.