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

Yuan Lu; Jian Feng Yang; Shao Yun Shan; Ji Qiang Gao; Zhi Hao Jin

doi:10.4028/www.scientific.net/KEM.368-372.878

Paper Titles

Combustion Synthesis of β-Si₃N₄ and β-SiAlON with Elongated Prismatic Micro-Crystals by Adding SrCO₃ and NH₄F
p.865

Synthesizing Silicon Nitride Whiskers by Solvothermal and Carbothermal Methods
p.868

Texturing of Si₃N₄ Ceramics via Strong Magnetic Field Alignment
p.871

Fabrication of Thick Silicon Nitride Substrates by Tape Casting
p.875

Effects of Sintering Additives on Properties of Porous Silicon Nitride Ceramics Fabricated by Carbothermal Reduction
p.878

Preparation of Si₃N₄ Ceramics by Aligning α-Si₃N₄ Whiskers
p.881

Oxidation and Corrosion of Silicon Nitride at 1200°C and 1500°C
p.885

Synthesis of Rod-Like α-SiAlON by Carbothermal Reduction-Nitridation
p.888

Optimization of α-SiAlON Microstructure by Heat Treatment
p.891

HomeKey Engineering MaterialsKey Engineering Materials Vols. 368-372Effects of Sintering Additives on Properties of...

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

Abstract:

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.

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Periodical:

Key Engineering Materials (Volumes 368-372)

Pages:

878-880

DOI:

https://doi.org/10.4028/www.scientific.net/KEM.368-372.878

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Online since:

February 2008

Authors:

Yuan Lu, Jian Feng Yang, Shao Yun Shan, Ji Qiang Gao, Zhi Hao Jin

Keywords:

Carbothermal Reduction, Porous, Sintering Additive

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References

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