Fabrication and strengthening of porous Si3N4 ceramics by replacement of oxide phase with Si3N4 at grain boundary through carbothermal nitridation

2017 ◽  
Vol 32 (17) ◽  
pp. 3344-3352
Author(s):  
Qiang Zhi ◽  
Zhaoyun Xu ◽  
Huan Pan ◽  
Jianfeng Yang ◽  
Yuchen Deng ◽  
...  
Keyword(s):  
Grain Boundary ◽  
Oxide Phase ◽  
Porous Si3n4 ◽  
Image Position ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

Abstract

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

Fabrication porous Si3N4 ceramics via starch consolidation–freeze drying process

2012 ◽  
Vol 68 ◽  
pp. 75-77 ◽  
Author(s):  
Dongxu Yao ◽  
Yongfeng Xia ◽  
Yu-Ping Zeng ◽  
Kai-hui Zuo ◽  
Dongliang Jiang
Keyword(s):  
Freeze Drying ◽  
Drying Process ◽  
Porous Si3n4 ◽  
Starch Consolidation ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics
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