A method of surface friction treatment of a ceramic-reinforced aluminum matrix composite brake disc, characterized by comprising the following steps:
- forming a layer of restructured film on a friction surface of the ceramic-reinforced aluminum matrix composite brake disc by means of the surface friction treatment by using an abrasive tool as a tool, wherein an abrasive hardness of the selected abrasive tool is less than or equal to a Mohs hardness of a ceramic in the ceramic-reinforced aluminum matrix composite brake disc;
- the surface friction treatment comprises the following steps:
- (1) rough grinding:
- during the rough grinding, controlling a rotational speed of the abrasive tool at 1000-3500 r/min, upper and lower abrasive tool feeding amount of 0.01-0.03 mm, and the friction surface of the ceramic-reinforced aluminum matrix composite brake disc after the rough grinding having a surface roughness Ra≤2.000 μm;
- (2) precision grinding:
- during the precision grinding, controlling a rotational speed of the abrasive tool at 1000-3500 r/min, upper and lower abrasive tool feeding amount of 0.001-0.01 mm, and the friction surface of the ceramic-reinforced aluminum matrix composite brake disc after the precision grinding having a surface roughness Ra≤1.000 μm;
- (3) surface friction:
- repeating axial abrasive tool travel 2-10 times without abrasive tool feeding;
- and
- through the above 3 steps, the restructured film is obtained;
- wherein the surface friction treatment forms abrasive particles comprising aluminum alloy abrasive particles and ceramic abrasive particles on the friction surface, and an instantaneous high temperature generated during friction melts part of the aluminum alloy abrasive particles and oxidizes a surface of part of the ceramic abrasive particles and the aluminum alloy abrasive particles, and meanwhile under friction force and pressure, the abrasive particles comprising the molten and softened aluminum alloy abrasive particles, the ceramic abrasive particles, and their surface oxidation products are broken, mixed, extruded, and bonded to form the restructured film which covers the entire surface of the ceramic-reinforced aluminum matrix composite brake disc to replace an original surface of the ceramic-reinforced aluminum matrix composite brake disc;
- a thickness of the restructured film is 1-5 μm;
- wherein during friction between the ceramic-reinforced aluminum matrix composite brake disc and a brake pad, the restructured film directly rubs against the brake pad, a chemical substance in the brake pad generates a layer of a friction film on a surface of the restructured film.