Friction-reducing and anti-wear composite material for wading kinematic pair and preparation method therefor

A method for preparing a friction-reducing and anti-wear composite material, comprising:

• (1) preparing polyether ether ketone (PEEK) powder, polyimide (PI) powder and an inorganic chopped carbon fiber for use;
• (2) uniformly mixing the PEEK powder, the PI powder and the inorganic chopped carbon fiber to form a powder mixture;
• and
• (3) placing the powder mixture in a mold and pressing the mold by a heat press for curing to obtain a cured product;
• wherein the pressing the mold in step (3) comprises:
• i) preheating the mold to 145-155° C. at a rate of 90-110° C./h, applying a pressure of 30-40 MPa on the mold, and keeping the temperature at 145-155° C. for 1-2 h;
• ii) raising the temperature of the mold to 255-265° C. at a rate of 40-60° C./h;
• increasing the pressure applied on the mold to 60-80 MPa;
• and keeping the temperature at 255-265° C. for 1 h;
• and
• iii) raising the temperature of the mold to 370-380° C. at a rate of 40-60° C./h, and when a temperature controller indicates that the temperature reaches a desired temperature, increasing the pressure applied on the mold to 100-120 MPa and keeping the temperature at 370-380° C. and the pressure at 100-120 MPa for 3-4 h, during which gas is discharged 2-3 times;
• (4) lowering the temperature of the mold to 255-265° C. at a rate of 40-60° C./h;
• reducing the pressure of the mold to 60-80 1 MPa;
• and keeping the temperature at 255-265° C. for 1-2 h;
• and
• (5) cooling the mold naturally at a rate of 90-110° C./h, releasing the pressure of the mold and demolding the cured product to obtain a sample of the friction-reducing and anti-wear composite material.