▎ 摘　　要

NOVELTY - Thermosonic sintering of nano silver/graphene composite ink comprises e.g. taking anhydrous ethanol, polyethylene glycol and glycerol mixing together by ultrasonic vibration, forming a mixed organic solvent having a viscosity of 0.01-100 Pas; and stirring 96-99.9 wt.% nano silver powder and the graphene by the mechanical stirring method, 4-0.1 wt.% graphene dispersing in mixed organic solvents, and configuring 0.01-90 wt.% nano silver/graphene composite ink, then, mixing nano silver/graphene compound ink uniformly filling in the dispensing head to prepare the circuit writing. USE - The method is useful for thermosonic sintering of nano silver/graphene composite ink (claimed). ADVANTAGE - The method has good electrical conductivity and mechanical bending performance (claimed). DETAILED DESCRIPTION - Thermosonic sintering of nano silver/graphene composite ink comprises (i) taking anhydrous ethanol, polyethylene glycol and glycerol mixing together by ultrasonic vibration, forming a mixed organic solvent having a viscosity of 0.01-100 Pas; and stirring 96-99.9 wt.% nano silver powder and the graphene by the mechanical stirring method, 4-0.1 wt.% graphene dispersing in mixed organic solvents, and configuring 0.01-90 wt.% nano silver/graphene composite ink, then, mixing nano silver/graphene compound ink uniformly filling in the dispensing head to prepare the circuit writing; (ii) extruding the high viscosity nano silver/graphene composite ink from the plastic cylinder by air pressure, and the forming a flexible substrate with a conductive circuit on a flexible substrate by a dispensing head; finally, drying the printed circuit board with a flexible conductive substrate in oven at 55-65 degrees C for 2-4 hours, to remove the volatile organic solvent; then, taking out the flexible substrate having the conductive circuit, for the next step of sintering; (iii) drying dried flexible substrate with the conductive circuit, placing between two layers of polydimethylsiloxane protective plastic, the polydimethylsiloxane has a thickness of 100-500 mu m, and placing the flexible substrate on the heating table; pressing the end of the ultrasonic transducer on a flexible substrate, applying a pressure to the flexible substrate to a desired value of 3-30 MPa; heating the substrate to a heating temperature of 60-160 degrees C; and then, under conditions of 3-30 MPa and 60-160 degrees C; hot-pressing pre-sintering, the sintering time is 1-10 minutes, and then, 3-30 MPa, 60-160 degrees C under the conditions, turning on ultrasonic vibration, carrying out thermosonic sintering, the sintering time is 1-10 minutes, through the role of ultrasound, pressure and temperature, to achieve solid-state diffusion between nano-silver/graphene. An INDEPENDENT CLAIM is also included for device comprising nano silver/graphene composite ink writing system and nano silver/graphene composite ink thermosonic sintering system, the writing system of the nano silver/graphene compound ink has the following structure: the writing base is provided with a writing column and upper and lower translation table and a writing motion translation stage, the writing column and the upper and lower translation table is provided with a writing fixing holder, the writing fixing holder is provided with a writing force sensor and the plastic tube, the upper end of the rubber cylinder is connected with a gas pipe and an air pressure controller, the lower end of the plastic tube connected to a little plastic head; the writing motion translation stage, a writing column and a vertical translation stage, writing force sensors and air pressure controller and writing the control computer using a communication connection; the thermosonic sintering system of the nano silver/graphene composite ink has the following structure: the sintering base is provided with a sintering column and a vertical translation table and a sintering movement translation stage, the sintering column and the vertical translation table is provided with a sintering fixing holder, the sintering fixing holder is provided with a sintering force sensor and a transducer, the transducer is connected with an ultrasonic generator, the transducer provided with a horn tip, the front end of the horn is provided with the tool head; the sintering movement translation table is provided with a heating platform; the sintering column and the vertical translation table, sintering motion translation stage, the heating table sintering force sensor and ultrasonic generator and the sintering control computer is communicatively connected.