高固相含量浆料浸渗法制备C/C-SiC复合材料及其性能

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Abstract C/C-SiC composites were prepared by high-solid-loading slurry impregnation and densified by precursor infiltration and pyrolysis (PIP) process. The rheological properties of the slurry, the microstructure, the mechanical properties and the ablative properties of the composites were studied. The results show that a good fluidity and permeability high-solid-loading (40%) SiC slurry can be prepared with 5% ethanol water, when the pH value of slurry is 6 and the mass fraction of PEI is 0.7%. SiC mainly concentrates in the fiber webs between the non-woven layers homogeneously. The bending strength and fracture toughness of C/C-SiC composites are 335.7 MPa and 16.2 MPa·m^1/2, respectively. C/C-SiC composites have good ablation resistance at 2 000 ℃, and the oxidation product SiO₂ can fill the defects such as pores and cracks to prevent the further oxidation of the materials.

Key words： C/C-SiC composites slurry microstructure mechanical property ablative property

Received: 13 March 2018 Published: 12 July 2019

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	YIN Huan
	PENG Ke
	RAO Fei
	YI Maozhong

Cite this article:

YIN Huan,PENG Ke,RAO Fei, et al. Preparation and properties of C/C-SiC composites by high-solid-loading slurry impregnation[J]. Materials Science and Engineering of Powder Metallurgy, 2018, 23(5): 539-546.

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http://pmbjb.csu.edu.cn/EN/ OR http://pmbjb.csu.edu.cn/EN/Y2018/V23/I5/539

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