A Multi-interlayer LMAS Joint of C/C-SiC Composites and LAS Glass Ceramics

doi:10.1016/j.jmst.2014.11.024

Abstract

Abstract: Porous C/C-SiC composites were prepared through a two-step chemical vapor infiltration process, and a multi-interlayer joint of Li₂O-MgO-Al₂O₃-SiO₂ (LMAS) was applied to join C/C-SiC composites and lithium aluminum silicate (LAS) glass ceramics by means of a vacuum hot-pressing technique. Plenty of SiC whiskers were generated in the pores of low-density C/C composites during chemical vapor deposition process, which is essential to form a zigzag interface structure between C/C-SiC substrate and the LMAS interlayer. The average shear strength of the LMAS joint was improved from 12.17 to 19.91 MPa after changing the composites from high-density C/C composites (1.75 g/cm³) with a CVD-SiC coating to the C/C-SiC composites with a low density (1.48 g/cm³). The improvement of the joint strength is mainly attributed to the formation of the inlay structure at the SiC-C/C and SiC-LMAS interfaces.

Key words: C/C-SiC, Interface, Interlayer, Joining and ceramic

Qiangang Fu, Fengling Zhao, Hejun Li, Han Peng, Xiaoying Nan. A Multi-interlayer LMAS Joint of C/C-SiC Composites and LAS Glass Ceramics[J]. J. Mater. Sci. Technol., 2015, 31(5): 467-472.

Figures/Tables 10

Preparation schematic of LMAS joint of C/C-SiC to LAS

Sample and clamp configuration for the shear strength

Surface microstructure and XRD patterns of C/C-SiC composites: (a) surface

(b) enlarged view of (a)

Microstructure of SiC coating on C/C composites prepared by CVD method: (a) surface (inset refers to the partial enlarged view)

(b) cross-section

Cross-section image of C/C-SiC to LAS joint: (a) microstructure of the joint

(b) enlarged view of LMAS/C/C-SiC interface (inset refers to the schematic diagram of the fiber)

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