Preparation method of solid self-lubricating material with high temperature resistance

A preparation method of solid self-lubricating material with high temperature resistance, including preparation steps as follows:

• step 1, mixing a polymer matrix resin and a nano lubricating filler to compose uniform raw material powders;
• step 2, placing the raw material powders in a cavity of hot-press die, gradually increasing a temperature to a first preloading temperature under a first preloading pressure;
• step 3, keeping the temperature for 90-120 minutes (min) at the first preloading temperature, and at the same time, controlling a hot pressing pressure to a second preloading pressure;
• step 4, controlling the hot pressing pressure at a third preloading pressure, and gradually increasing the temperature to a solid-phase molding temperature of the solid self-lubricating material;
• wherein the solid-phase molding temperature of the solid self-lubricating material is 15-20° C. higher than a glass transition temperature of the solid self-lubricating material, and the glass transition temperature of the solid self-lubricating material is 5-30° C. higher than a glass transition temperature of the polymer matrix resin resulting from a glass transition temperature drift caused by the nano lubricating filler;
• step 5, carrying out heat preservation for 60-180 min under a molding pressure for solid-phase molding after the temperature reaches the solid-phase molding temperature of the solid self-lubricating material, wherein the molding pressure is greater than the third preloading pressure, the third preloading pressure is greater than the second preloading pressure, and the second preloading pressure is greater than the first preloading pressure;
• step 6, gradually reducing the temperature to the first preloading temperature after the solid-phase molding is completed, next, removing the molding pressure, finally, obtaining the solid self-lubricating material with high temperature resistance of 200-280° C. by naturally cooling to normal temperature and demoulding.