Of Mosi <sub> 2 </ Sub> / Rare Earth Composite Particles Of Molybdenum Sheet Organization And Performance Impact

MoSi2 power was synthesised by self-propagating high temperature synthesis(SHS). MoSi2/La2O3,MoSi2/Y2O3,MoSi2/La2O3/Y2O3 composite particles were made by mechanical alloying(MA) method, and then doped into molybdenum by solid-solid method respectively, with a mass fraction of 2%. At the same time, pure Mo and La2O3/Y2O3 doped Mo were made for coMParison. The microstructure and properties of sintered molybdenum which were made though Powder Metallurgy(PA) method were detected, then rolled into sheet. The microstructure and properties of the rolling sheet were investegated too. Results show that: both strength and toughness of the sintered Mo and rolling Mo sheet which doped MoSi2/La2O3, MoSi2/Y2O3 and MoSi2/La2O3/Y2O3 are higher than that doped La2O3/Y2O3 and pure Mo. And with the rise of temperature, the strengthen effect of MoSi2/rare earth oxides is more apparent. To the sintered Mo, MoSi2/Y2O3 composite particles contribute more to the strength, while the effect of MoSi2/La2O3 on toughness is greater than that of MoSi2/Y2O3. And the strength and toughness of MoSi2/La2O3/Y2O3 doped Mo are both in between. To hot rolling sheet, the strength of MoSi2/La2O3/Y2O3 composite particle doped Mo is apparently higher than MoSi2/La2O3 and MoSi2/Y2O3 doped Mo, which is more suitable for use as high temperature strcture materials.