Synthesis of Nanocrystalline Silver by Warm-Vacuum-Compaction Method
The nano-sized silver particles were prepared by flow-levitation technique firstly, and then the particles were compacted with warm-vacuum-compaction method to fabricate the nanocrystalline silver with average grain size of 18.5 nm. The influences of experimental parameters, such as pressure, temperature and pressure duration, upon the density and microhardness of the nanocrystalline silver were investigated in detail. The experimental results show that both the density and microhardness of the nanocrystalline silver increase significantly with higher pressure or elevated temperature, while the duration of pressure has a little effect to the density. The average microhardness of the as-prepared nanocrystalline silver is 1.25 GPa, which is 3 times higher than that of coarse-grained silver.
Xiaoming Sang, Pengcheng Wang, Liqun Ai, Yungang Li and Jinglong Bu
W. Liu and Q. H. Zhou, "Synthesis of Nanocrystalline Silver by Warm-Vacuum-Compaction Method", Advanced Materials Research, Vols. 284-286, pp. 958-961, 2011