Densification behavior of Mo nanopowders prepared by mechanochemical processing

Sintering kinetics analysis of molybdenum nanopowder in a non-isothermal process

“…Figure 1 shows micrographs of the (a) Mo nanopowder and (b) commercial powder. As previously reported [9,10], the Mo nanopowder with an average particle size of approximately 100 nm synthesized via the mechanochemical process was used below 200 nm. The commercial powder was composed of large agglomerates consisting of 1 µm to 2 µm particles.…”

“…The Mo nanopowder was fabricated by high-energy ball milling at a milling speed of 400 rpm in an Ar atmosphere for 20 h, followed by a non-isothermal hydrogen reduction in an H 2 atmosphere with a dew point of −76°C up to a temperature of 800°C at a heating rate of 10°C/min [10]. Commercial Mo powder (1 µm to 5 µm, 99.99 %, JunTec Co., Korea) was used to compare the sinterability.…”

“…Although these sintering aids are very effective for the densification of the Mo powder, they cause deterioration of the electrical properties of Mo. The second method to enhance sinterability is using powder size refinement [6][7][8][9][10][11]. Kim et al [10] confirmed via dilatometric analysis that nano-sized powders result in superior sinterability when compared with micro-sized particles.…”

“…The second method to enhance sinterability is using powder size refinement [6][7][8][9][10][11]. Kim et al [10] confirmed via dilatometric analysis that nano-sized powders result in superior sinterability when compared with micro-sized particles. The densification of the Mo nanopowder with a particle size of approximately 100 nm started at a lower temperature around 700°C, compared with 1,100°C for a micro-sized powder with a particle size of 1 µm to 2 µm, and the shrinkage rate peaked below 1,000°C.…”

Synthesis and ion conductivity of (Bi2O3)0.75(Dy2O3)0.25 ceramics with grain sizes from the nano to the micro scale

“…When using rapid sintering technique such as Spark Plasma Sintering (SPS), one can expect to maintain the nano size of the grains in dense ceramics [25][26][27].…”