Binder for additive manufacturing of metal slurry as well as preparation method and application of binder
A metal paste and additive manufacturing technology, applied in the field of 3D printing, can solve the problems of unstable rheological properties of paste, increased porosity of molded parts, and uneven density distribution of parts, etc. The effect of material combination is sufficient
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[0034] According to another typical embodiment of the present invention, a method for preparing a metal paste for additive manufacturing is provided, the method comprising:
[0035] S1. Heat and stir 60-75 parts by mass of the binder body to obtain a liquid binder body;
[0036] Specifically, 60-75 parts of one of polypropylene, polystyrene, polymethyl methacrylate, palm wax, polyethylene wax, polyethyl acetate, microcrystalline wax, and polyvinyl chloride is used as the main body of the binder . Heat at 130°C-190°C and mechanically stir for 1 hour to make it fully absorb heat and turn into a liquid state.
[0037] S2. Add 10-15 parts by mass of surfactant, 10-25 parts by mass of molding additives and 2-3 parts by mass of nano silicon dioxide to the main body of the liquid binder one by one under heating and stirring to obtain materials for additives Binders for the manufacture of metal pastes;
[0038] Specifically, including:
[0039] S2.1. Add surfactant: 10-15 parts of...
Embodiment 1
[0047] The 17-4PH stainless steel powder was screened by an ultrasonic vibrating sieve with a 1340-mesh screen, and the 17-4PH stainless steel powder with an average particle size of 10 μm was screened.
[0048] Palm wax was selected as the main body of the binder, and 70 parts of palm wax was heated at 150°C and mechanically stirred at a speed of 200rpm for 1 hour to make it fully absorb heat and become liquid.
[0049] After the liquid state was stable, 10 parts of lithium stearate was added and kept at 150° C. for 30 minutes with mechanical stirring at a speed of 100 rpm.
[0050] After the mixture was stabilized, 18 parts of butyl phthalate was added and mechanically stirred at 150° C. at a speed of 100 rpm for 30 minutes.
[0051] Add 2 parts of nano-silica, and mechanically stir at 100 rpm for 30 min at 150°C.
[0052] Finally, the screened 17-4PH stainless steel powder was added to the prepared binder, so that the mass ratio of binder to metal powder was 1:10, and the ...
Embodiment 2
[0054] The 316L stainless steel powder was screened by an ultrasonic vibrating sieve with a sieve of 800 mesh, and the 316L stainless steel powder with an average particle size of 20 μm was screened.
[0055] Choose polyethylene wax as the main body of the binder, take 75 parts of polyethylene wax, heat it at 130°C and mechanically stir it at a speed of 150rpm for 1 hour, so that it can fully absorb heat and become a liquid state.
[0056] After the liquid state was stabilized, 12 parts of octyl phosphoric acid was added to maintain mechanical stirring at 130° C. at a speed of 150 rpm for 30 minutes.
[0057] After the mixture was stabilized, 10 parts of glyceryl monostearate was added and mechanically stirred at 130° C. at a speed of 100 rpm for 30 minutes.
[0058] Add 3 parts of nano-silica, and mechanically stir at 100 rpm for 30 min at 130°C.
[0059] Finally, the sieved 316L stainless steel powder was added to the prepared binder, so that the mass ratio of binder to met...
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