The Study on Porosity Controllable Filter Material for the Integrated Gasification Combined Cycle

Abstract:

The porous ceramic filter material is the most effective filter materials in the integrated gasification combined cycle. The porous silicon nitride due to its higher mechanical strength, as well as good corrosion resistance, is considered as a promising material in the integrated gasification combined cycle, and it were prepared directly though the SiO₂ and α-Si₃N₄ through carbothermal reduction - pressureless sintering in nitrogen. There was a great lot weight loss in this reaction, so it was expected to create the high porosity materials. The rod-like β-Si₃N₄ grains and uniform pores were formed through changing the content of α-Si₃N₄, SiO₂ and C. So high-performance and porosity controlled porous silicon nitride filter material was obtained. With an increasing in the α-Si₃N₄ content, the weight loss, the linear shrinkage, and the porosity decreased, the flexural strength increased accordingly. The porous silicon nitride filter material with addition of 50wt% α-Si₃N₄ showed a higher aspect ratio β-Si₃N₄ grains and better mechanical properties .

• Periodical: Solid State Phenomena (Volume 315)
• Pages: 10-15
• DOI: https://doi.org/10.4028/www.scientific.net/SSP.315.10
• Online since: March 2021
• Authors: Yong Ding*, Yuan Lu, Ke Yun, Jin’e Liu, Nan Liang
• Keywords: Carbothermal Reduction, Porous Filter Material, Porous Silicon Nitride

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