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

材料学院

科研成果: 期刊稿件 › 文章 › 同行评审

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摘要

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.

源语言	英语
页（从-至）	11855-11863
页数	9
期刊	Ceramics International
卷	43
期	15
DOI	https://doi.org/10.1016/j.ceramint.2017.06.031
出版状态	已出版 - 15 10月 2017

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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.",

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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

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SN - 0272-8842

VL - 43

SP - 11855

EP - 11863

JO - Ceramics International

JF - Ceramics International

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ER -

Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

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