Fabrication of β-sialon nanoceramics by high-energy mechanical milling and spark plasma sintering
Fabrication of β-sialon nanoceramics by high-energy mechanical milling and spark plasma sintering
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DOI：
10.1088/0957-4484/16/9/027
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发表时间：
2005-09
期刊：
影响因子：
3.5
通讯作者：
Xin Xu;T. Nishimura;N. Hirosaki;R. Xie;Yoshinobu Yamamoto;Hidehiko Tanaka
中科院分区：
文献类型：
--
作者：
Xin Xu;T. Nishimura;N. Hirosaki;R. Xie;Yoshinobu Yamamoto;Hidehiko Tanaka
采用高能机械球磨和放电等离子烧结法制备了单相β-sialon纳米陶瓷Si 5AlON 7。球磨后，原始粉末混合物（Si 3 N4，AlN，Al 2 O3）大部分转变为含有大量分散良好的纳米晶β-Si 3 N4颗粒的非晶相。研磨促进了起始粉末之间的混合和反应;纳米晶β-Si 3 N4颗粒上的均匀非晶相通过沉淀直接形成具有设计成分的β-sialon颗粒。球磨还改善了起始粉末的烧结能力，因此与原样粉末相比，致密化温度降低了约100 °C。颗粒重排是球磨粉末致密化的主要机制。在1550 °C烧结5 min后，得到了由直径约50 nm的等轴β-sialon晶粒组成的均匀显微组织。
A single-phase β-sialon nanoceramic, Si5AlON7, has been prepared by high-energy mechanical milling, followed by spark plasma sintering. After milling, the starting powder mixture (Si3N4, AlN, Al2O3) was mostly transformed into an amorphous phase that contains a large number of well-dispersed nanocrystalline β-Si3N4 particles. Milling promoted the mixing and reaction among the starting powders; β-sialon grains with the designed composition were formed directly through precipitation from the homogeneous amorphous phase on the nanocrystalline β-Si3N4 particles. Milling also improved the sintering ability of the starting powders, so the densification temperature was lowered by about 100 °C compared with that for as-received powders. Particle rearrangement was the main densification mechanism for the milled powders. A homogeneous microstructure composed of equiaxed β-sialon grains with a diameter of about 50 nm was obtained after sintering at 1550 °C for 5 min.