The invention relates to a
coating material for hard
alloy and a preparation method thereof, and belongs to the technical field of
surface engineering. The
coating material comprises the following components in percentage by weight: 17 to 23 percent of AlN-coated Cu micro
powder, 3.5 to 4.5 percent of cladding aid and the balance of high-entropy
alloy powder, according to the AlN-coated Cu micro
powder,
dithiothreitol and
triallylamine are subjected to an
addition reaction to form a macromolecular compound with a
side chain containing hydroxyl, namely a surface modifier, the hydroxyl on the macromolecular
side chain of the surface modifier and an
oxygen-containing group on the surface of aluminum
nitride powder form a
hydrogen bond, the
hydrogen bond is loaded on the surface of the aluminum
nitride powder, and the surface of the aluminum
nitride powder is modified. The added
copper ions are captured through a
chelation effect formed by a
nitrogen-containing
thioether structure in molecules, the
copper ions are enriched on the surface of the aluminum nitride, and then the surface of the aluminum nitride is coated with a
copper elementary substance under the reduction of
zinc powder; the surface modifier plays a bidirectional bridging role,
copper coating is uniformly introduced to the surface of aluminum nitride, and the
wear resistance and
corrosion resistance of the
coating are remarkably improved.