Electromagnetic properties of porous Si3N4 ceramics with gradient distributions of SiC and pores fabricated by directional in–situ nitridation reaction

2018 ◽  
Vol 44 (1) ◽  
pp. 1176-1181 ◽  
Author(s):  
Xiangming Li ◽  
Guojian Yuan ◽  
Yanli Zhou ◽  
Xiaotao Zhu ◽  
Guina Ren
Keyword(s):  
Electromagnetic Properties ◽  
Nitridation Reaction ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

Dielectric Properties of Porous Si3N4 Ceramics Prepared by In Situ Cordierite Bonding

2010 ◽  
Vol 434-435 ◽  
pp. 701-704
Author(s):  
Yong Feng Xia ◽  
Yu Ping Zeng ◽  
Dong Liang Jiang
Keyword(s):  
Dielectric Constant ◽  
Phase Composition ◽  
Dielectric Properties ◽  
Sintering Temperature ◽  
Porous Si ◽  
Porous Si3n4 ◽  
Ceramic Process ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In situ bonding porous silicon nitride (Si3N4) ceramics were fabricated in air using a conventional ceramic process using Si3N4, Al2O3 and MgO as the starting materials. The effects of additives content, sintering temperature and holding time on phase composition, microstructure, dielectric properties and porosity were studied. The porous Si3N4 ceramics were composed of α- Si3N4, SiO2 (cristobalite) and cordierite. Porous Si3N4 ceramics with porosities of 34.12~50.22%, dielectric constant of 2.95~4.45 and dielectric loss of ~0.0025 were obtained.

A novel route for the fabrication of porous Si3N4 ceramics with unidirectionally aligned channels

2020 ◽  
Vol 276 ◽  
pp. 128264
Author(s):  
Ye Zhang ◽  
Dongxu Yao ◽  
Kaihui Zuo ◽  
Yongfeng Xia ◽  
Jinwei Yin ◽  
...  
Keyword(s):  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

Effects of Pore Morphology on the Fabrication and Mechanical Properties of Porous Si3N4 Ceramics

2007 ◽  
Vol 280-283 ◽  
pp. 1231-1236
Author(s):  
Jian Feng Yang ◽  
Ji Qiang Gao ◽  
Guo Jun Zhang ◽  
Ichiro Hayashi ◽  
Tatsuki Ohji
Keyword(s):  
Mechanical Properties ◽  
Gas Permeability ◽  
Slip Casting ◽  
Porous Ceramics ◽  
Pore Morphology ◽  
Porous Si ◽  
Die Pressing ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

Porous Si3N4 ceramics with different pore morphology have been fabricated, utilizing either organic whiskers or starch as the fugitive agents, through slip-casting and die-pressing technique, respectively. The obtained porous ceramics have rod shaped or equiaxial pore morphology, originated from there two kinds of pore forming agents. The mechanical properties were investigated. The strength decreased considerably when small amount of whiskers were added, however, further increase in the whisker content only cause a moderate decrease of the strength. Gas permeability were measured for the samples with high whisker content of 60 vol% (corresponding to porosity of about 45% in the sintered bodies), and was compared with the counterpart contained the same porosity in which pores were equiaxial. The flexural strength of the samples with these two types of fugitive particles was almost the same, but the permeability of samples with rod-shaped pores were much higher than that with equiaxial pores, which can be understood in terms of a short pass model.

Thermal shock resistance of γ-Y2Si2O7/Y2O3-Al2O3-SiO2 coating for porous Si3N4 ceramics

2019 ◽  
Vol 357 ◽  
pp. 304-312 ◽  
Author(s):  
Xingyu Fan ◽  
Hongjie Wang ◽  
Min Niu ◽  
Yunfei Wang ◽  
Dahai Zhang ◽  
...  
Keyword(s):  
Thermal Shock ◽  
Thermal Shock Resistance ◽  
Sio2 Coating ◽  
Shock Resistance ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics
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