Laser-assisted Dispersion of Coarse Hard Particles into Aluminum-Alloy Surfaces for Wear Protection

摘要

Technological investigations have been done to disperse coarse grained TiC and 1182 hard particles into the surface of pure aluminium and the AlSi10Mg alloy by a multi-kilowatt CO_2- laser. By means of proper shaping the laser beam, it was possible to suppress almost the melt bath convection and to produce homogeneous and pore free hard particle dispersion layers with thicknesses of 0.1 to 0.25 mm. Essential higher microhardnesses have been measured in the layer matrix compared with those of the substrate. In abrasive wear tests with 40 #mu#m SiC as abrasive medium these dispersion layers provided mass losses up to 60 times smaller compared to those of the AlSi10Mg alloy.