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.

Effects of Sintering Additives on Properties of Porous Silicon Nitride Ceramics Fabricated by Carbothermal Reduction

2008 ◽  
Vol 368-372 ◽  
pp. 878-880 ◽  
Author(s):  
Yuan Lu ◽  
Jian Feng Yang ◽  
Shao Yun Shan ◽  
Ji Qiang Gao ◽  
Zhi Hao Jin
Keyword(s):  
Carbothermal Reduction ◽  
Sintered Sample ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Sintering Additives ◽  
Sintering Additive ◽  
Fine Microstructure ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between silicon dioxide and carbon. The influences of four types of sintering additives on the microstructure and mechanical properties of the porous Si3N4 ceramics were investigated. XRD analysis proved complete formation of a single-phase β-Si3N4. SEM analysis showed that the resultant porous Si3N4 ceramics occupied fine microstructure and a uniform pore structure. The sintered sample with Lu2O3 as sintering additive showed finer, a higher aspect ratio β-Si3N4 grains. The addition of Eu2O3 accelerated the densification of porous Si3N4 ceramics, decreased the porosity and increased the flexural strength.

Porous AlN Ceramics Fabricated by Carbothermal Reduction

2014 ◽  
Vol 788 ◽  
pp. 627-631
Author(s):  
Yuan Lu ◽  
Jing Long Li ◽  
Jian Feng Yang ◽  
Peng Li
Keyword(s):  
Mechanical Properties ◽  
Carbothermal Reduction ◽  
Glass Phase ◽  
Sintering Temperature ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
High Porosity ◽  
Sintering Additives ◽  
Fine Microstructure ◽  
Complete Formation

A new method for preparing porous AlN ceramics with high porosity had been developed by carbothermal reduction of die-pressed green bodies composed of alumina, carbon, sintering additives and AlN seeds. The influences of sintering additives and sintering temperature on the microstructure and mechanical properties of porous AlN ceramics were investigated. XRD analysis proved that complete formation of AlN phase except for minor of glass phase. SEM analysis showed that the resultant porous AlN ceramics occupied fine microstructure and a uniform pore structure. Porous AlN ceramics with a porosity of 41~66% and a strength of 2.7~ 51.8 MPa were obtained.

Porous Silicon Nitride Ceramics Prepared by Reduction – Nitridation of Diatomite

2009 ◽  
Vol 620-622 ◽  
pp. 753-756
Author(s):  
Yao Hui Xue ◽  
Yuan Lu ◽  
Bo Wang ◽  
Jian Feng Yang ◽  
Wei Zhong Lu ◽  
...  
Keyword(s):  
Carbothermal Reduction ◽  
Sedimentary Rock ◽  
Aquatic Plant ◽  
Xrd Analysis ◽  
Sem Analysis ◽  
Main Ingredient ◽  
Nitride Ceramics ◽  
Fine Microstructure ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics

In this paper, porous Si3N4 ceramics were fabricated by carbothermal reduction between carbon black and diatomite. Diatomite is a siliceous, sedimentary rock consisting principally of the fossilized skeletal remains of diatom, a unicellular aquatic plant related to the algae. The main ingredient of diatomite is the amorphous active silicon dioxide. The influence of diatomite particle size on the microstructure of sintering bodies was analyzed. XRD analysis demonstrated the formation of Si3N4 except for minor of glass phase. SEM analysis showed that the resultant porous β-Si3N4 ceramics occupied fine microstructure and uniform pore structure.

Porous TiN Ceramics Fabricated by Carbothermal Reduction Method

2013 ◽  
Vol 745-746 ◽  
pp. 667-672 ◽  
Author(s):  
Yuan Lu ◽  
Jian Feng Yang ◽  
Zhi Liang Chen ◽  
Jian Jun Han ◽  
Jing Jing Li ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Particle Size ◽  
Pore Structure ◽  
Carbothermal Reduction ◽  
Xrd Analysis ◽  
Linear Shrinkage ◽  
Reduction Reaction ◽  
Sem Analysis ◽  
High Porosity ◽  
Microstructure And Mechanical Properties

Porous TiN ceramics with high porosity and uniform pore structure was prepared following the carbothermal reduction reaction between TiO2 and carbon. Influences of sintering additives and particle size of TiO2 on the microstructure and mechanical properties of porous TiN ceramics were investigated. Microstructure and mechanical properties of porous TiN ceramics were studied by XRD, SEM and three-point bending measurement. XRD analysis proved that the TiN phase has completely formed after reaction. In addition, SEM analysis showed that the resultant porous TiN ceramics were composed of fine grains with uniform pore structure. The addition of La2O3 not only accelerated the densification of porous TiN ceramics, but also decreased the porosity and increased the flexural strength. With a decrease in TiO2 particle size, the linear shrinkage increased and the porosity decreased accordingly.

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

Preparation, characterization and luminescence properties of porous Si3N4 ceramics with Eu2O3 as sintering additive

2010 ◽  
Vol 130 (12) ◽  
pp. 2298-2304 ◽  
Author(s):  
Fangli Yu ◽  
Jianfeng Yang ◽  
Anneke (C.A.) Delsing ◽  
Bert (H.T.) Hintzen
Keyword(s):  
Luminescence Properties ◽  
Sintering Additive ◽  
Porous Si3n4 ◽  
Si3n4 Ceramics ◽  
Porous Si3n4 Ceramics
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