Wear behavior of Cr_3C_2-NiCr detonation spray coating

摘要

Coatings can be applied to surfaces to improve the surface characteristics over those of the bulk properties and are widely used in tribological applications either to reduce wear and/or to modify friction during contact. One of the foremost coating methods for combating wear is thermal spraying, however, despite its widespread industrial use, little is known about the basic friction behavior and the mechanisms by which such coatings wear. In order to prolong the conticaster roll's life, Cr_3C_2-NiCr detonation spray coating has been processed on the roll surface in the steelmaking plant of Bao Shan Steel Company. The mechanical properties and wear resistance of the coating is studied in this paper. The abrasive and dry frictional wear testing are performed on a pin-on-disk tester. Experiment results show that the wear resistance of the coated samples without the risk of seizure are much better than those of the uncoated at room and elevated temperature with any load and sliding velocity. And the coating wear mechanisms under different test conditions are discussed.