Porous Silicon Nitride Ceramics Prepared by Extrusion Using Starch as Binder
Porous Silicon Nitride Ceramics Prepared by Extrusion Using Starch as Binder
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DOI：
10.1111/j.1551-2916.2008.02701.x
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发表时间：
2008-11
影响因子：
3.9
通讯作者：
G. Jiang;Jianfeng Yang;Jiqiang Gao;K. Niihara
中科院分区：
文献类型：
--
作者：
G. Jiang;Jianfeng Yang;Jiqiang Gao;K. Niihara
以淀粉为粘结剂和造孔剂，采用挤压成型技术制备了多孔氮化硅陶瓷的绿色坯体。研究了挤压、干燥、脱脂和烧结阶段后不同的孔隙率、显微结构和力学性能。结果表明，在整个工艺过程中，样品的孔隙率、密度、显微结构和抗弯强度变化很大。结果表明，在孔隙率为43%时，试样的抗弯强度为160 MPa，具有均匀的纤维状互锁结构，由发达的棒状β-Si 3 N4晶粒组成。此外，孔隙率、微观结构和强度可以通过烧结条件如烧结氮气压力来进一步定制。以廉价的淀粉为粘结剂和造孔剂的挤出成型法是制备高性价比氮化硅多孔陶瓷的一种很有前途的方法。
Green bodies of porous silicon nitride ceramics were shaped by the extrusion technique using starch simultaneously as binder during extrusion and as pore-maker during subsequent thermal debinding. The different porosities, microstructures, and mechanical properties after the extrusion, drying, debinding, and sintering stages were investigated. The results showed that the porosity, density, microstructure, and flexural strength of samples varied greatly through the whole process stages. The resultant samples had a 160 MPa flexural strength at a porosity of 43% and a uniform fibrous interlocking microstructure consisting of well-developed rod-like β-Si 3 N 4 grains. In addition, porosity, microstructure, and strength can be further tailored by sintering conditions such as the sintering nitrogen pressure. Extrusion using cheap starch as binder and pore-maker is a promising preparation route for manufacturing cost-effective porous silicon nitride ceramics.