|Table of Contents|

Properties of C/SiC composites prepared by modified precursor(PDF)

《火箭推进》[ISSN:1672-9374/CN:CN 61-1436/V]

Issue:
2017年03期
Page:
67-73
Research Field:
工艺与材料
Publishing date:

Info

Title:
Properties of C/SiC composites prepared by modified precursor
Author(s):
WANG Fuyuan;  WANG Yi;  YANG Xiaohui;  BAI Longteng
Xi’an Aerospace Propulsion Institute, Xi’an 710100, China
Keywords:
C/SiC;  modified precursor;  mechanical property;  ablative property;  microstructure
PACS:
V425-34
DOI:
-
Abstract:
A crosslinking agent is used to modify the polycarbosilane (PCS) precursor. The modified precursor is used to fabricate C/SiC composites. Because of the relative high ceramic yield of the modified precursor, the densification time of C/SiC composite was reduced, while the porosity of samples was decreased by 7.2% and the density was increased by 2.01g/m3. With the improvement of the inner microstructure of C/SiC, the modified precursor can also improve the mechanical properties of C/SiC. The bending strength was increased by 459.4MPa and the fracture toughness was increased by 13.6 MPa·m1/2, which were increased by 51.9% and 32.0% respectively in comparison with samples fabricated by the single component PCS precursor. The performance test results of ablation show that the mass ablative rate and the linear ablative rate are 8.3×10-3mm/s and 4.3×10-3g/s respectively, which have been reduced 85.7% and 73.1% respectively in comparison with samples fabricated by the single component PCS precursor. The analysis results of the surface morphology and the inner microstructure of C/SiC indicate that the improvement of mechanical and ablation properties benefit by the dense matrix and the matrix protection for the fiber.

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