Abstract
The densification of nanocrystalline MgO powders with average particle size of 60nm by spark plasma sintering (SPS) was investigated within the temperature range of 900–1420°C, an applied pressure of 30MPa, and duration ranges of 3–8min. The relative density of these sintered specimens continuously increased with increasing sintering temperature, and the value reached an asymptote at 1420°C. The grain size slowly increased at low sintering temperatures (900–1200°C) and rapidly increased at high sintering temperatures (1200–1420°C). The grain growth of the MgO nanopowders during SPS was investigated based on classical phenomenological kinetic theory. The analysis of the grain growth kinetics showed that the grain growth exponent varied at different sintering temperatures, whereas the activation energy for grain growth at low sintering temperatures was smaller than that at high sintering temperatures, and the maximum value was achieved at 1200°C. The microhardness of the sintered specimens at different temperatures was tested and the results were discussed according to the microstructure characteristics analysis of the sintered specimens at different temperatures.
Published Version
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