Fabrication of 
-sialon nanoceramics by high-energy mechanical milling and spark plasma sintering
Authors: Xu, Xin; Nishimura, Toshiyuki; Hirosaki, Naoto; Xie, Rong-Jun; Yamamoto, Yoshinobu; Tanaka, Hidehiko
Source: Nanotechnology, Volume 16, Number 9, September 2005 , pp. 1569-1573(5)
Publisher: Institute of Physics Publishing
Key:
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
Abstract:
A single-phase-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 -Si3N4 particles. Milling promoted the mixing and reaction among the starting powders; -sialon grains with the designed composition were formed directly through precipitation from the homogeneous amorphous phase on the nanocrystalline -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 -sialon grains with a diameter of about 50 nm was obtained after sintering at 1550 °C for 5 min.
Document Type: Research article
DOI: 10.1088/0957-4484/16/9/027
Key:
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
- Free Content
- New Content
- Subscribed Content
- Free Trial Content
Click here for Page Help