Preparation and Mechanical Property of Short Carbon Fiber Reinforced Silicon Carbide Matrix Composites

doi:10.15541/jim20180578

Abstract

Abstract:

In this study, high-strength silicon carbide (SiC) matrix composites reinforced by short carbon fiber (C_sf) (SiC/C_sf) were fabricated by slip casting and reaction sintering. The effects of the dispersant (tetramethylammonium hydroxide, TMAH) content and mixing time on the viscosity of the slurry were investigated. In addition, the influences of the volume fraction of C_sf and particle size of SiC powder on the mechanical property were also studied. It is found that the viscosity of slurry with 0.1wt% TMAH is the lowest and the mixing time is preferably controlled at 6 h. The composites with 35vol% C_sf shows the highest flexural strength of (412±47) MPa. The composites with 5 μm SiC powder achieves the highest flexural strength of (387±40) MPa. Grain composition demonstrates that the sample prepared by a mixture of 5 and 50 μm SiC powder at a ratio of 2 to 1 shows relatively excellent mechanical properties with the flexural strength up to (357±41) MPa.

Key words: C_sf/SiC composites, slip casting, reaction sintering

CLC Number:

TQ174

MENG Xiang-Wei,WU Xi-Shi,PEI Bing-Bing,ZHU Yun-Zhou,HUANG Zheng-Ren. Preparation and Mechanical Property of Short Carbon Fiber Reinforced Silicon Carbide Matrix Composites[J]. Journal of Inorganic Materials, 2019, 34(9): 1015-1020.

Figures/Tables 14

References 16

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Item	Specification
Tensile strength	≥ 3.5 GPa
Density	1.75 g/cm³
Monofilament diameter	7 μm
Aspect ratio	2 : 1-8 : 1
Coefficient of linear expansion	-0.1 × 10^-6

Item	Specification
Tensile strength	≥ 3.5 GPa
Density	1.75 g/cm³
Monofilament diameter	7 μm
Aspect ratio	2 : 1-8 : 1
Coefficient of linear expansion	-0.1 × 10^-6

No.	Mixing time/h	Solid content/ %	Carbon fiber volume fraction/vol%	SiC particle size/μm	TMAH/wt%	PVP/ wt%
1	4	70	45	5	0.3	2
2	6	70	45	5	0.3	2
3	8	70	45	5	0.3	2

No.	Mixing time/h	Solid content/ %	Carbon fiber volume fraction/vol%	SiC particle size/μm	TMAH/wt%	PVP/ wt%
1	4	70	45	5	0.3	2
2	6	70	45	5	0.3	2
3	8	70	45	5	0.3	2

Volume Fraction/%	Green body		Sintered bulk
Volume Fraction/%	Apparent porosity/%	Bulk density/ (g·cm^-3)	Apparent porosity/%	Bulk density/ (g·cm^-3)
30	(46.09±0.25)	(1.26±0.01)	(1.17±0.26)	(3.06±0.02)
35	(47.14±0.46)	(1.19±0.01)	(0.38±0.12)	(3.08±0.007)
40	(45.08±1.20)	(1.16±0.03)	(1.17±0.23)	(3.01±0.01)