Fabrication of SiCf/SiC composites through hybrid processing via chemical vapor infiltration, electrophoretic deposition, and liquid silicon infiltration

Journal of Asian Ceramic Societies

Seyoung Kim¹  Young-Hoon Seong¹  Hyung-Joon Bang¹  In-Sub Han¹  Soo-Hyun Kim¹  Sang-Kuk Woo¹  Kati Raju²  Hyun-Kwuon Lee³ 

[1] Energy Efficiency and Materials Research Division, Korea Institute of Energy Research, Daejeon, South Kore;Energy Efficiency and Materials Research Division, Korea Institute of Energy Research, Daejeon, South Kore;School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, South Kore;School of Advanced Materials Science and Engineering, Kumoh National Institute of Technology, Gumi, South Kore;

关键词: SiC/SiC composites;    CVI;    EPD;    LSI;    Microstructure;    Flexural strength;   

DOI  :  10.1080/21870764.2021.1935121

来源: Taylor & Francis

【 摘 要 】

The present work demonstrates the effectiveness of a novel hybrid process comprising chemical vapor infiltration (CVI), electrophoretic deposition (EPD), and liquid silicon infiltration (LSI) techniques for the successful fabrication of low-porosity SiCf/SiC composites. For this purpose, fiber/matrix interphase dual coating layers of BN and SiC were coated onto SiC fabrics using CVI. A ceramic matrix consisting of SiC and carbon black nanoparticles was then infiltrated into the fine voids of the fabrics using EPD. Finally, LSI was performed to obtain dense microstructures with low porosities by filling the remaining small gaps and reacting Si with C to form SiC. Microstructural results observed by scanning electron microscopy revealed a dense structure with no damage to the fibers. The experimental density was found to be 2.62 g/cc, with an open porosity of 0.55. The room-temperature flexural strength was evaluated to be 111 MPa, and the composites displayed little fiber pull-out.

【 授权许可】

CC BY