Preparation and characteristics of highly porous BN-Si3N4 composite ceramics by combustion synthesis

Nitride based ceramics are considered as a kind of promising material for structural and functional integration due to their robust structure, extreme environmental resistance and electromagnetically transparency. It is still challenging to prepare nitride based ceramics with homogeneous and control...

Full description

Saved in:
Bibliographic Details
Published in:Journal of the European Ceramic Society 2022-09, Vol.42 (12), p.4835-4845
Main Authors: Chen, Shile, Wang, Liang, He, Gang, Shao, Gang, Wang, Hailong, Li, Jiangtao, Wang, Chang-An
Format: Article
Language:English
Subjects:
BN-Si3N4
Combustion synthesis
Composite ceramics
Gelcasting
High porosity
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:Nitride based ceramics are considered as a kind of promising material for structural and functional integration due to their robust structure, extreme environmental resistance and electromagnetically transparency. It is still challenging to prepare nitride based ceramics with homogeneous and controllable microstructure because of their low self-diffusion coefficient and difficulty in sintering. Here, we developed a gelcasting-SHS process by combining gelcasting forming and self-propagating high temperature synthesis (SHS) for the preparation of porous BN-Si3N4 composite ceramics. First, carbon residue problem in the gelcasting -SHS process was studied. Based on the result, porous BN-Si3N4 composite ceramics with high porosity (69.42 ~ 86.48%), high strength (21.7 ~ 81.0 MPa) and low dielectric constants (1.42 ~ 2.87) were synthesized. In addition, the thermal shock resistance of porous BN-Si3N4 composite ceramics until 1000 ℃ was evaluated.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2022.05.022