Comparison in microstructure and mechanical properties of porous Si3N4 ceramics with SiC and Si3N4 coatings

2009 ◽  
Vol 527 (1-2) ◽  
pp. 103-109 ◽  
Author(s):  
Xiangming Li ◽  
Xiaowei Yin ◽  
Litong Zhang ◽  
Tianhao Pan
Keyword(s):  
Mechanical Properties ◽  
Microstructure And Mechanical Properties ◽  
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.

The effect of fabrication parameters on the mechanical properties of sintered reaction bonded porous Si3N4 ceramics

2014 ◽  
Vol 34 (15) ◽  
pp. 3461-3467 ◽  
Author(s):  
Dongxu Yao ◽  
Yongfeng Xia ◽  
Kai-hui Zuo ◽  
Dongliang Jiang ◽  
Jens Günster ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Porous Si3n4 ◽  
Fabrication Parameters ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

Fabrication of Porous Silicon Nitride with High Porosity

2007 ◽  
Vol 336-338 ◽  
pp. 1105-1108 ◽  
Author(s):  
Shao Yun Shan ◽  
Jian Feng Yang ◽  
Ji Qiang Gao ◽  
Wen Hui Zhang ◽  
Zhi Hao Jin ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Xrd Analysis ◽  
Reduction Reaction ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Additive ◽  
Fine Microstructure ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this study, porous Si3N4 ceramics were fabricated by carbothermal reduction reaction between silicon dioxide and carbon. The influences of different starting powders and sintering additives on microstructure and mechanical properties were investigated. XRD analysis demonstrated the formation of single-phase β-Si3N4 except for glass phase and minor of α-Si3N4 phase. SEM analysis showed that the resultant porous Si3N4 ceramics occupied fine microstructure and uniform pore structure. The samples with fine starting powder showed fine, high aspect ratio of β-Si3N4 grains and good mechanical properties. The addition of Al2O3 accelerated the densification of porous Si3N4 ceramics. With an increasing in the sintering additive content, the porosity decreased, the flexural strength increased.

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