Preparation process of Ti3AlC2 ceramic phase-toughened molybdenum alloy

A preparation process of a Ti3AlC2 ceramic phase-toughened molybdenum alloy, comprising the following steps:

• (1):
• subjecting a certain amount of a molybdenum dioxide (MoO2) powder and a Ti3AlC2 powder that are weighed according to requirements of a final product to dry mixing for 12 h to 32 h using a dual-power mixer, and sieving to obtain a mixed powder for later use;
• (2):
• placing the mixed powder prepared in step (1) into a molybdenum boat to allow high-temperature reduction under a reducing hydrogen atmosphere at 750° C. to 1,000° C. with a hydrogen flow rate of (12-20) m3/h and a powder spreading height that is less than or equal to ⅘ of a volume of the molybdenum boat for 6 h to 24 h, and mixing a resulting reduced Ti3AlC2 ceramic phase-containing powder with a commercial coarse-grained Mo powder at a certain proportion in the dual-power mixer for 10 h to 20 h to obtain a precursor powder;
• (3):
• selecting a suitable cladding material according to a size of the final product, and subjecting the cladding material to ultrasonic cleaning and preheating before filling with a powder;
• (4):
• filling the cladding material treated in step (3) with a certain amount of the precursor powder obtained in step (2) while conducting vibration, sealing upper and lower parts of the cladding material, welding edges of the cladding material, and checking gas tightness;
• (5):
• heating a precursor powder-filled cladding material in a muffle furnace to 500° C. to 600° C. to remove possible water of crystallization, and conducting high-temperature degassing for 8 h to 20 h using a vacuum evacuation system;
• sealing and welding an air extraction port of the cladding material by argon arc welding when a vacuum degree in the cladding material reaches 1×10−3 Pa to 1×10−5 Pa, and then conducting hot-pressed sintering to obtain a sintered molybdenum alloy;
• (6):
• heating the sintered molybdenum alloy obtained in step (5) to a temperature of 1,200° C. to 1,600° C. and holding the temperature for 30 min to 60 min under a protective atmosphere with a flow rate of (5-15) m3/h, and then conducting thermoplastic processing to obtain a molybdenum alloy billet;
• and
• (7):
• annealing the molybdenum alloy billet obtained in step (6) under a protective atmosphere to obtain a high-density and high-toughness molybdenum alloy.