Characterisation of porous silicon nitride materials produced with starch
Characterisation of porous silicon nitride materials produced with starch
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DOI：
10.1016/s0955-2219(03)00212-7
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发表时间：
2004-01-01
影响因子：
5.7
通讯作者：
Hampshire, S
中科院分区：
文献类型：
--
作者：
Díaz, A;Hampshire, S
多孔氮化硅在金属陶瓷热工程部件、生物材料和催化剂载体等方面的应用越来越受到人们的关注。本文介绍了多孔氮化硅陶瓷材料的制造，使用一种易挥发的添加剂，玉米淀粉，它允许生产的样品具有不同的孔隙率从接近0到0.25的体积分数。初始组合物由92重量%的Si 3 N4，6重量% Y2 O3和2重量%氧化铝。在氮气下在1800 ℃下进行烧结2小时。测量了相对密度随短效添加剂含量的变化。显微结构分析揭示了由晶间玻璃相包围的细长β-Si 3 N4晶粒的致密基质，并且含有大的孔隙和空腔。已经测量了某些组合物的孔径、几何形状和粒度。杨氏模量和断裂模量已被确定为孔隙率的体积分数的函数。杨氏模量-孔隙度关系已与文献中以前的工作进行了比较，发现这种依赖性接近于立方堆积排列的球形孔模型。(C)2003爱思唯尔有限公司。保留所有权利。
Porous silicon nitride is gaining interest for a number of applications including metal-ceramic thermal engineering components, biomaterials and catalyst supports. This paper describes the fabrication of porous silicon nitride ceramic materials using a fugitive additive, corn starch, which allows samples to be produced with different volume fractions of porosity from similar to0 to 0.25. The initial composition consisted of 92 wt.% Si3N4, 6 wt.% Y2O3 and 2 wt.% Al2O3. Sintering was carried out at 1800 degreesC for 2 h under nitrogen. Relative density as a function of the fugitive additive content has been measured. Microstructural analysis reveals a dense matrix of elongated beta-Si3N4 grains surrounded by intergranular glass phase and containing large pores and cavities. Pore size, geometry and grain size have been measured for certain compositions. Young's modulus and modulus of rupture have been determined as a function of the volume fraction of porosity. The Young's modulus-porosity relationship has been compared with previous work in the literature and it was found that this dependency is close to that for a model for spherical pores in cubic stacking arrangement. (C) 2003 Elsevier Ltd. All rights reserved.