Preparation Technology of Nanometer Ceramic Particles Reinforced Metal-Matrix Graded Coating by Laser Multi-Layer Cladding

Abstract

In this study, a new preparation method for nanometer ceramic particles reinforced metal-matrix graded coating by laser multi-layer cladding technology was introduced. The preparation process including following steps: Firstly, a groups of mixture ratio of micro/nanometer covered composite powders are fabricated using a different content of nanometer ceramic particles and micrometer metal-matrix powders by mechanical ball milling; Secondly, the composite powders are suppressed to laser cladding layer by squash presetting; Last, the layers with an increased content of nanometer ceramic particles are laser clad in turn, then a metal-matrix graded coating strengthened by nanometer ceramic particles is prepared. Furthermore, an experiment for fabricating nano-Al2O3 particles reinforced MCrAlY graded coating by laser multi-layer cladding process was carried out. The results show that the laser-clad graded coating has no obvious interface between the different layers with dense and continuous structure. In addition, the microstructure of the laser layer was refined and composed of fine equiaxed grains because of addition of nanometer ceramic particles.

The laser direct deposition iron-based alloy coating with high wear resistance

“…Laser direct deposition is one of the advanced surface preparation wear resistant coating technologies. Many important achievements have been obtained by using method of the alloy composition design, laser process parameter optimization, and carbide particle reinforced [1][2][3][4][5][6][7][8]. However, the study on in situ particles reinforced coatings with large thickness and good wear resistance by the laser direct deposition was less reported.…”