Carbon fiber-based precoated sand material for selective laser sintering and preparation method thereof
A technology of laser sintering and carbon fiber, which is applied in the manufacture of tools, casting molding equipment, metal processing equipment, etc., can solve the problems of short laser beam irradiation time, large amount of sand gas generation, poor air permeability and collapsibility, etc., and achieve rapid response manufacturing capability Huge, obvious reinforcement effect, improved thermal stability
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Embodiment 1
[0030] A carbon fiber-based coated sand material for selective laser sintering is carried out in the following steps:
[0031] Step 1: Use γ-ray irradiation to modify the surface of chopped carbon fibers. First, put the chopped carbon fibers with a diameter of 7 μm and a length of 2.5 mm into an acetone solution, wash them for 48 hours, and then dry them. In the irradiated bottle of tetraethylene glycol acetone solution with active functional group concentration of 2 mol / L, nitrogen gas was continuously flowed through one end of the two vent holes of the irradiated bottle for 2 min, and sealed after the oxygen in the bottle was removed. Put it in a Coγ-ray irradiation source, and carry out co-irradiation grafting modification according to the irradiation dose of 200kGy. After the chopped carbon fibers were irradiated, they were cleaned with acetone and dried in a vacuum oven at 50 °C for 12 h for later use.
[0032] Step 2: Using the thermal coating process, sieve the spheric...
Embodiment 2
[0037] A carbon fiber-based coated sand material for selective laser sintering is carried out in the following steps:
[0038] Step 1: Use electrochemical polymerization to modify the surface of chopped carbon fibers. First, put the chopped carbon fibers with a diameter of 7 μm and a length of 1.5 mm into an acetone solution for 48 hours, and then use sulfuric acid as an electrolyte to deionize Water was used as a solvent, and monomers with a mass fraction of 1% were added to form an electrolyte. Then carbon fiber was used as an anode and graphite was used as a cathode. At room temperature, electrolytic polymerization was carried out at a polymerization current of 90 mA for 60 seconds, and then deionized water was used to The surface of the chopped carbon fiber was cleaned to remove residual electrolyte ions and unpolymerized monomers on the surface, and finally it was dried in a vacuum oven at 50 °C for 12 h for later use.
[0039] Step 2: Using the thermal coating process, s...
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