Investigation of the effect of the grain sizes on the dynamic strength of the fine-grained alumina ceramics obtained by Spark Plasma Sintering
arXiv (Cornell University)(2022)
摘要
The results of dynamic strength tests of the alumina ceramics with various
grain sizes are presented. The ceramics were obtained by Spark Plasma Sintering
(SPS) of industrial submicron and fine Al2O3 powders. The heating up was
performed with the rate of 10 oC/min; the grain sizes in the ceramics was
controlled by varying the SPS temperature and the heating rate as well as by
varying the initial sizes of the Al2O3 particles in the powders. The ceramics
had a high density (over 98
mean grain sizes varied from 0.8 to 13.4 mkm). The dynamic compressing tests
were carried out by modified Kolsky method with using split Hopkinson pressure
bar. The tests were performed at room temperature using a 20-mm PG-20 gas gun
with the strain rate of 10^3 s-1. The dependence of the dynamic ultimate
strength of alumina on the grain size was found for the first time to have a
non-monotonous character (with a maximum). The maximum value of the dynamic
ultimate compression strength (SY = 1060 MPa) was provided at the mean grain
size of 2.9-3 mkm. The reduction of SY for alumina in the range of submicron
grain sizes was shown to originate from the reduction of the relative density
of the ceramics sintered at lower SPS temperatures.
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关键词
alumina ceramics,grain sizes,plasma,fine-grained
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