Preparation method for wear-resistant coating on cylindrical inner wall surface of aluminum alloy

A method for generating a wear-resistant coating on a cylindrical inner surface of an aluminum alloy workpiece, comprising:

• mixing 0.1-0.5 wt % of a graphene powder and 99.5-99.9 wt % of an Al powder, the graphene powder has a lamellar structure with a thickness of 1-5 nm;
• combining 12-18 wt % of the mixed graphene powder and the Al powder, 62-65 wt % of an Fe2O3 powder, 7-9 wt % of a ZnO powder, 1-3 wt % of a SiO2 powder, 1-3 wt % of a B2O3 powder, and 2-17 wt % of a Cu—Ti alloy powder to obtain a mixed powder, wherein the Cu—Ti alloy powder include 95 wt % of Cu and 5 wt % of Ti;
• combining the mixed power powder with a polyvinyl alcohol (PVA) liquid, heating at 82-85° C., and performing spray granulation to obtain a low-temperature self-propagating composite;
• stirring a slurry comprising the low-temperature self-propagating composite and sodium silicate;
• injecting the slurry into a cylindrical inner cavity of an aluminum alloy workpiece, the aluminum alloy workpiece is mounted on a horizontal rotary table for rotation and is heated with the rotation at 80-100° C. such that the slurry is uniformly solidified on the cylindrical inner surface of the cylindrical inner cavity;
• and
• burning the slurry, after the slurry is uniformly solidified and while the rotation is maintained, with an oxyacetylene flame to form the wear-resistant coating.