Preparation and Properties of High-Temperature Self-Lubricating Materials Based on H13 Steel

High-temperature self-lubricating materials based on H13 steel are prepared by the powder metallurgy method. The sintering process, phase addition and high-temperature testing of the material are studied so that the mechanical and wear performance of the composites can be optimized. The results show that the optimum sintering process is 2 h at a temperature of 1250 degrees C. When the contents of Cr2C3 and CaF2 are 10%, the mechanical and sintering properties of the composites are acceptable. The relative density reaches 80.2% and the bending strength reaches 720.2 MPa. Moreover, CaF2 effectively reduces the friction coefficient and wear rate of the material. The friction coefficient decreases to a minimum of 0.24, but the wear rate increases to a maximum of 7.26 x 10(-5) mm(2)/min at a load of 1065 g. Cr2C3 helps to alleviate the oxidation of the composites, and the precipitation of CaF2 causes network cracks to reduce the thermal fatigue performance.