Microstructure and properties of porous SiC ceramics by LPCVI technique regulation

被引：15

作者：

You, Qiangwei ^{[1
]}

Liu, Yongsheng ^{[1
,2
]}

Wan, Jiajia ^{[1
]}

Shen, Zhijian ^{[2
]}

Li, Hongxia ^{[3
]}

Yuan, Bo ^{[2
,3
]}

Cheng, Laifei ^{[1
]}

Wang, Gang ^{[3
]}

机构：

[1] Northwestern Polytech Univ, Sci & Technol Thermostruct Composite Mat Lab, Xian 710072, Shaanxi, Peoples R China

[2] Stockholm Univ, Arrhenius Lab, Dept Mat & Environm Chem, S-11418 Stockholm, Sweden

[3] Sinosteel Luoyang Inst Refractories Res Co Ltd, Luoyang 471039, Henan, Peoples R China

来源：

CERAMICS INTERNATIONAL | 2017年 / 43卷 / 15期

关键词：

Gradient porous SiC ceramics; Mechanical property; CVI-SiC; Permeability; GROWTH; PERMEABILITY; NANOWIRES;

D O I：

10.1016/j.ceramint.2017.06.031

中图分类号：

TQ174 [陶瓷工业]; TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

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.

引用

页码：11855 / 11863

页数：9

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