A method for compound strengthening and self-repairing of shield machine cutterhead surface
A surface compounding and self-repairing technology, applied in metal material coating process, coating and other directions, can solve problems such as wear and complex working environment, achieve high thermal conductivity, avoid scrap disposal, and excellent thermal conductivity
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Embodiment 1
[0021] A method for compound strengthening and self-repairing of the surface of a shield machine cutter head, comprising the following steps:
[0022] (1) Surface cleaning: remove rust and oil on the surface of the cutter head;
[0023] (2) Surface crack repair: Mix 10 parts of nano-scale graphene, 10 parts of TiC, 10 parts of carbon nanotubes, 10 parts of molybdenum dioxide and 10 parts of Q235 powder through ultrasonic vibration, and then pass the powder feeding nozzle to the knife Fill the disc wear place with protective gas and raise the temperature to 3200°C. The laser power is 1500W, the spot diameter is 100um, and the laser heat treatment time is 1s. Form laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 microsheet layer on the surface of the worn part of the cutter head; after the cutter head is cooled to room temperature, it is heated to 620°C by induction for stress relief annealing, and the heat preservation 2h, then air-cooled to room temperature...
Embodiment 2
[0029] (1) Surface cleaning: remove rust and oil on the surface of the cutter head;
[0030](2) Surface crack repair: Mix 20 parts of nano-scale graphene, 20 parts of TiC, 20 parts of carbon nanotubes, 20 parts of molybdenum dioxide and 20 parts of Q235 powder through ultrasonic vibration and spray them to the Fill the worn part of the cutter head with protective gas and heat up to 3300°C. The laser power is 1700W, the spot diameter is 130um, and the laser heat treatment time is 1.2s. Coating, so that the surface of the cutter head wears to form a laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 microsheet layer; after the cutter head is cooled to room temperature, it is heated to 620 ° C ~ 640 ° C by induction Stress relief annealing, heat preservation for 2.5h, then air cooling to room temperature;
[0031] (3) Modification of phenolic resin: nano-scale SiO 2 20 parts, TiO 2 20 copies, Al 2 o 3 Add 20 parts and 20 parts of ZnO powder to phenolic resin...
Embodiment 3
[0036] (1) Surface cleaning: remove rust and oil on the surface of the cutter head;
[0037] (2) Surface crack repair: Mix 30 parts of nanoscale graphene, 30 parts of TiC, 30 parts of carbon nanotubes, 30 parts of molybdenum dioxide and 30 parts of Q235 powder through ultrasonic vibration and spray them to the Fill the worn part of the cutterhead with protective gas and heat up to 3500°C. The laser power is 2000W, the spot diameter is 150um, and the laser heat treatment time is 1.5s. Coating, so that the surface of the cutter head wears to form a laser cladding graphene-TiC-carbon nanotube-molybdenum dioxide-Q235 microsheet layer; after the cutter head is cooled to room temperature, it is heated to 620 ° C ~ 640 ° C by induction Stress relief annealing, heat preservation for 3h, then air cooling to room temperature;
[0038] (3) Modification of phenolic resin: nano-scale SiO 2 30 parts, TiO 2 30 parts, Al 2 o 3 Add 30 parts and 30 parts of ZnO powder to phenolic resin, an...
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