Abstract
The conventional molybdenum alloys, lacking of hard particles enhancing wear property, have relative poor wear resistance though they are widely used in wear parts. To resolve the above question, Mo alloys reinforced by in-situ Al 2O 3 particles are developed using powder metallurgy method. The in-situ α-Al 2O 3 particles in molybdenum matrix are obtained by the decomposition of aluminum nitrate after liquid–solid incorporation of MoO 2 and Al(NO 3) 3 aqueous solution. The α-Al 2O 3 particles well bonded with molybdenum distribute evenly in matrix of Mo alloys, which refine grains of alloys and increase hardness of alloys. The absolute density of alloy increases firstly and then decreases with the increase of Al 2O 3 content, while the relative density rises continuously. The friction coefficient of alloy, fluctuating around 0.5, is slightly influenced by Al 2O 3. However, the wear resistance of alloy obviously affected by the Al 2O 3 particles rises remarkably with the increasing of Al 2O 3 content. The Al 2O 3 particles can efficiently resist micro-cutting to protect molybdenum matrix, and therefore enhances the wear resistance of Mo alloy.
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