Microstructure and mechanical properties of porous Si3N4-SiO2 ceramics fabricated by a process combining carbothermal reduction and sol-gel infiltration-sintering

被引：23

作者：

Cai, Yaohui ^{[1
]}

Li, Xiangming ^{[1
]}

Dong, Jiahui ^{[1
]}

机构：

[1] Northwest A&F Univ, Coll Water Resources & Architecture Engn, Yangling 712100, Shaanxi, Peoples R China

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2014年 / 601卷

基金：

中国博士后科学基金; 中国国家自然科学基金;

关键词：

Si3N4; SiO2; Porous; Carbothermal reduction; Sol-gel; SILICON-NITRIDE CERAMICS; DIELECTRIC-PROPERTIES; KINETICS; PRESSURE;

D O I：

10.1016/j.msea.2014.01.087

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

Porous Si3N4-SiO2 ceramics were fabricated at low-cost by combining carbothermal reduction and sol-gel infiltration-sintering. Using nano-sized diatomite grains as a silica source and dextrin as a carbon source, highly porous Si3N4 ceramics with micron-sized pores were fabricated by carbothermal reduction of diatomite preforms. Si3N4 ceramics fabricated from 20 wt% dextrin preforms at 1450 degrees C had the highest flexural strength (13.4 MPa), high porosity (80.1%) and small pore size (0.8 mu m). Using the obtained porous Si3N4 ceramics as preforms, porous Si3N4-SiO2 ceramics were fabricated by silica sol-gel infiltration-sintering. These porous Si3N4-SiO2 ceramics possessed high flexural strength (48.7 MPa), high porosity (43.5%) and small pore size (0.4 mu m). (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：111 / 115

页数：5

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