Effects of preform structure on microstructure and mechanical properties of C/SiC composites reinforced by Si3N4 nanowires

Pengfei Tao; Kaiyuan Li; Yiguang Wang

doi:10.1016/j.ceramint.2017.12.225

Effects of preform structure on microstructure and mechanical properties of C/SiC composites reinforced by Si₃N₄ nanowires

Pengfei Tao, Kaiyuan Li, Yiguang Wang^*

^*Corresponding author for this work

Northwestern Polytechnical University Xian

Research output: Contribution to journal › Article › peer-review

13 Citations (Scopus)

Abstract

Three kinds of preforms containing Si₃N₄ nanowires were densified using chemical vapor infiltration (CVI) to form two-dimensional C/SiC composites. Effects of preform structure on microstructural and mechanical behaviors of composites were evaluated. Compared to C/SiC composite without nanowires, C/SiC composite with gradient distribution of Si₃N₄ nanowires (C/SiC-NW-G) had a 19% increase in density (2.35 g/cm³) and a 51% decrease in porosity (7%). Introducing gradient-distributed Si₃N₄ nanowires suppressed the formation of large closed pores during densification, which resulted in improved microstructure of C/SiC-NW-G. With an increase in the density and a decrease in the porosity, C/SiC-NW-G composites have tensile strength of 280 ± 22 MPa and flexural strength of 462 ± 31 MPa, which were improvements of 11% and 12%, respectively, compared to C/SiC without Si₃N₄ nanowires.

Original language	English
Pages (from-to)	5719-5725
Number of pages	7
Journal	Ceramics International
Volume	44
Issue number	5
DOIs	https://doi.org/10.1016/j.ceramint.2017.12.225
Publication status	Published - 1 Apr 2018
Externally published	Yes

Keywords

C/SiC composites
Mechanical properties
Preform structure
SiN nanowires

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10.1016/j.ceramint.2017.12.225

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title = "Effects of preform structure on microstructure and mechanical properties of C/SiC composites reinforced by Si3N4 nanowires",

abstract = "Three kinds of preforms containing Si3N4 nanowires were densified using chemical vapor infiltration (CVI) to form two-dimensional C/SiC composites. Effects of preform structure on microstructural and mechanical behaviors of composites were evaluated. Compared to C/SiC composite without nanowires, C/SiC composite with gradient distribution of Si3N4 nanowires (C/SiC-NW-G) had a 19% increase in density (2.35 g/cm3) and a 51% decrease in porosity (7%). Introducing gradient-distributed Si3N4 nanowires suppressed the formation of large closed pores during densification, which resulted in improved microstructure of C/SiC-NW-G. With an increase in the density and a decrease in the porosity, C/SiC-NW-G composites have tensile strength of 280 ± 22 MPa and flexural strength of 462 ± 31 MPa, which were improvements of 11% and 12%, respectively, compared to C/SiC without Si3N4 nanowires.",

keywords = "C/SiC composites, Mechanical properties, Preform structure, SiN nanowires",

author = "Pengfei Tao and Kaiyuan Li and Yiguang Wang",

note = "Publisher Copyright: {\textcopyright} 2017 Elsevier Ltd and Techna Group S.r.l.",

year = "2018",

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T1 - Effects of preform structure on microstructure and mechanical properties of C/SiC composites reinforced by Si3N4 nanowires

AU - Tao, Pengfei

AU - Li, Kaiyuan

AU - Wang, Yiguang

PY - 2018/4/1

Y1 - 2018/4/1

N2 - Three kinds of preforms containing Si3N4 nanowires were densified using chemical vapor infiltration (CVI) to form two-dimensional C/SiC composites. Effects of preform structure on microstructural and mechanical behaviors of composites were evaluated. Compared to C/SiC composite without nanowires, C/SiC composite with gradient distribution of Si3N4 nanowires (C/SiC-NW-G) had a 19% increase in density (2.35 g/cm3) and a 51% decrease in porosity (7%). Introducing gradient-distributed Si3N4 nanowires suppressed the formation of large closed pores during densification, which resulted in improved microstructure of C/SiC-NW-G. With an increase in the density and a decrease in the porosity, C/SiC-NW-G composites have tensile strength of 280 ± 22 MPa and flexural strength of 462 ± 31 MPa, which were improvements of 11% and 12%, respectively, compared to C/SiC without Si3N4 nanowires.

AB - Three kinds of preforms containing Si3N4 nanowires were densified using chemical vapor infiltration (CVI) to form two-dimensional C/SiC composites. Effects of preform structure on microstructural and mechanical behaviors of composites were evaluated. Compared to C/SiC composite without nanowires, C/SiC composite with gradient distribution of Si3N4 nanowires (C/SiC-NW-G) had a 19% increase in density (2.35 g/cm3) and a 51% decrease in porosity (7%). Introducing gradient-distributed Si3N4 nanowires suppressed the formation of large closed pores during densification, which resulted in improved microstructure of C/SiC-NW-G. With an increase in the density and a decrease in the porosity, C/SiC-NW-G composites have tensile strength of 280 ± 22 MPa and flexural strength of 462 ± 31 MPa, which were improvements of 11% and 12%, respectively, compared to C/SiC without Si3N4 nanowires.

KW - C/SiC composites

KW - Mechanical properties

KW - Preform structure

KW - SiN nanowires

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JO - Ceramics International

JF - Ceramics International

IS - 5

ER -

Effects of preform structure on microstructure and mechanical properties of C/SiC composites reinforced by Si₃N₄ nanowires

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Keywords

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