By Rajat Banerjee, Indranil Manna
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7 Al2O3/Mo nanocomposites Molybdenum particles are one of the refractory metals and have a lower thermal expansion coefficient than the Al2O3 matrix. A conventional powder metallurgical technique was used to prepare Al2O3/Mo nanocomposites. 5, 10, 15 and 20 vol%). The powder mixtures were ball milled using zirconia milling media in acetone for 24 h. These slurries were dried © Woodhead Publishing Limited, 2013 Thermal shock resistant/flame retardant ceramic nanocomposites 19 and passed through a 250 μm screen.
Several investigators have studied nanocomposites in which nanometresized particles were dispersed within ceramic matrix grains and/or at the grain boundaries to eliminate strength-degrading flaws (Mizutani et al. 1997, Nawa et al. 1992, Siegel et al. 2001). They tried to develop ceramic/ metal nanocomposites by selecting Y2O3-stabilized TZP (3 mol% Y2O3) as the ceramic matrix material and refractory molybdenum (Mo) metal powder as the dispersing particles. The powder mixtures, containing 10, 20, 30, 40 © Woodhead Publishing Limited, 2013 Thermal shock resistant/flame retardant ceramic nanocomposites 21 and 50 vol% Mo, were ball milled in acetone for 24 h.
This hardening is supposed to be accounted for by the contribution of the fine-grained microstructure of the Al2O3 matrix (Sargent and Page 1978) and/or the intergranular nanostructure of Al2O3/Mo nanocomposites, in which nanometre-sized molybdenum particles are dispersed within the Al2O3 grains and at the grain boundaries. In fact, the monolithic Al2O3 used in this nanocomposite showed a negative dependence of grain size on hardness and the nanometresized metal particle will itself cause hardening (Wierenga et al.