Fabrication and Evaluation of Ca-α SiAlON Nano Ceramics
Fabrication and Evaluation of Ca-α SiAlON Nano Ceramics
复制标题
Ca-α SiAlON纳米陶瓷的制备与评价
DOI：
10.4028/www.scientific.net/kem.237.105
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
Yi
中科院分区：
文献类型：
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作者：
Junichi Tatami;M. Iguchi;Mikinori Hotta;Cheng Zhang;K. Komeya;T. Meguro;M. Omori;T. Hirai;M. E. Brito;Yi
纳米复合材料具有优异的性能，如高强度。本文介绍了CaSiAlON纳米陶瓷的研制及其性能评价。首先，以SiO2-Al2O3-CaCO3粉末混合物为原料，采用碳热还原—氮化法制备CaSiAlON纳米粉体，以获得精细纯净的烧结原料。结果表明，该粉体产品由纳米级颗粒组成。在氧化铝砂浆中研磨后，使用火花等离子烧结（SPS）方法在1700°C下致密化20分钟。透射电镜观察表明，烧结体由纳米级晶粒组成。CaSiAlON纳米陶瓷的断裂韧性虽然低于Si3N4陶瓷，但硬度高于Si3N4。
Nano-composites have excellent properties, such as high strength. This work presents a study on the development of a CaSiAlON nano ceramic and evaluation of its properties. At first, CaSiAlON nano powders were synthesized by carbothermal reductionnitridation from a SiO2-Al2O3-CaCO3 powder mixture in order to obtain a fine and pure raw material for sintering. It was confirmed that the powder product was composed of nano-sized particles. After ground in an alumina mortar, the powder was densified at 1700°C for 20 minutes using the spark plasma sintering (SPS) method. TEM observation showed that the sintered body was composed of nano-sized grains. Although the fracture toughness of CaSiAlON nano ceramics was lower than that of Si3N4 ceramics, it had higher hardness than Si3N4.