Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

Qiangwei You; Yongsheng Liu; Jiajia Wan; Zhijian Shen; Hongxia Li; Bo Yuan; Laifei Cheng; Gang Wang

doi:10.1016/j.ceramint.2017.06.031

Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

Qiangwei You
, Yongsheng Liu
, Jiajia Wan
, Zhijian Shen
, Hongxia Li
, Bo Yuan
, Laifei Cheng
, Gang Wang

School of Materials Sience and Engineering

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

13 Scopus citations

Abstract

A new gradient pore structure in porous SiC ceramics was fabricated by low pressure chemical vapor infiltration (LPCVI). Effects of deposition duration on the mechanical properties and permeability of porous SiC ceramics were investigated. Results demonstrated that pore diameter and shapes decreased from the surface to the interior along with LPCVI duration. Porous SiC ceramics with deposition duration of 160 h exhibited flexural strength of 48.05 MPa and fracture toughness of 1.30 MPa m^1/2, where 221% and 189% improvements were obtained compared to porous SiC ceramics without LPCVI, due to CVI-SiC layer strengthening effect. Additionally, at the same gas velocity, pressure drop increase rate was faster due to apparent porosity and pore size change.

Original language	English
Pages (from-to)	11855-11863
Number of pages	9
Journal	Ceramics International
Volume	43
Issue number	15
DOIs	https://doi.org/10.1016/j.ceramint.2017.06.031
State	Published - 15 Oct 2017

Keywords

CVI-SiC
Gradient porous SiC ceramics
Mechanical property
Permeability

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10.1016/j.ceramint.2017.06.031

Cite this

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title = "Microstructure and properties of porous SiC ceramics by LPCVI technique regulation",

abstract = "A new gradient pore structure in porous SiC ceramics was fabricated by low pressure chemical vapor infiltration (LPCVI). Effects of deposition duration on the mechanical properties and permeability of porous SiC ceramics were investigated. Results demonstrated that pore diameter and shapes decreased from the surface to the interior along with LPCVI duration. Porous SiC ceramics with deposition duration of 160 h exhibited flexural strength of 48.05 MPa and fracture toughness of 1.30 MPa m1/2, where 221\% and 189\% improvements were obtained compared to porous SiC ceramics without LPCVI, due to CVI-SiC layer strengthening effect. Additionally, at the same gas velocity, pressure drop increase rate was faster due to apparent porosity and pore size change.",

keywords = "CVI-SiC, Gradient porous SiC ceramics, Mechanical property, Permeability",

author = "Qiangwei You and Yongsheng Liu and Jiajia Wan and Zhijian Shen and Hongxia Li and Bo Yuan and Laifei Cheng and Gang Wang",

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

year = "2017",

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TY - JOUR

T1 - Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

AU - You, Qiangwei

AU - Liu, Yongsheng

AU - Wan, Jiajia

AU - Shen, Zhijian

AU - Li, Hongxia

AU - Yuan, Bo

AU - Cheng, Laifei

AU - Wang, Gang

PY - 2017/10/15

Y1 - 2017/10/15

N2 - A new gradient pore structure in porous SiC ceramics was fabricated by low pressure chemical vapor infiltration (LPCVI). Effects of deposition duration on the mechanical properties and permeability of porous SiC ceramics were investigated. Results demonstrated that pore diameter and shapes decreased from the surface to the interior along with LPCVI duration. Porous SiC ceramics with deposition duration of 160 h exhibited flexural strength of 48.05 MPa and fracture toughness of 1.30 MPa m1/2, where 221% and 189% improvements were obtained compared to porous SiC ceramics without LPCVI, due to CVI-SiC layer strengthening effect. Additionally, at the same gas velocity, pressure drop increase rate was faster due to apparent porosity and pore size change.

AB - A new gradient pore structure in porous SiC ceramics was fabricated by low pressure chemical vapor infiltration (LPCVI). Effects of deposition duration on the mechanical properties and permeability of porous SiC ceramics were investigated. Results demonstrated that pore diameter and shapes decreased from the surface to the interior along with LPCVI duration. Porous SiC ceramics with deposition duration of 160 h exhibited flexural strength of 48.05 MPa and fracture toughness of 1.30 MPa m1/2, where 221% and 189% improvements were obtained compared to porous SiC ceramics without LPCVI, due to CVI-SiC layer strengthening effect. Additionally, at the same gas velocity, pressure drop increase rate was faster due to apparent porosity and pore size change.

KW - CVI-SiC

KW - Gradient porous SiC ceramics

KW - Mechanical property

KW - Permeability

UR - https://www.scopus.com/pages/publications/85020476304

U2 - 10.1016/j.ceramint.2017.06.031

DO - 10.1016/j.ceramint.2017.06.031

M3 - 文章

AN - SCOPUS:85020476304

SN - 0272-8842

VL - 43

SP - 11855

EP - 11863

JO - Ceramics International

JF - Ceramics International

IS - 15

ER -

Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

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Keywords

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