Method for manufacturing graphene aluminum casting
AssigneeVolans United Corporation
InventorYu-Ta Chou
Life of this patent
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Abstract
A method for manufacturing graphene aluminum casting where special sand boxes are used together with vacuum evacuation to harden dry sand between two pieces of EVA film, thereby producing an upper mold box and a lower mold box for aluminum casting. The molten aluminum used to cast a graphene aluminum casting is evenly mixed with graphene powder, so there is a certain proportion of graphene inside the graphene aluminum casting. And because there is a thin layer of graphene powder on the surface of one of the EVA films, these graphene powder will adhere to the surface of the graphene aluminum casting without falling off.
Claims7
A method for manufacturing graphene aluminum casting, comprising the steps of:
- a) heating a first EVA (Ethylene Vinyl Acetate) film to soften, then placing the first EVA film on a surface of a first mold, wherein the first mold is placed above an exhaust box, the exhaust box exerts negative pressure between the first EVA film and the first mold to make the first EVA film closely adhere to an upper surface of the exhaust box, and graphene powder is sprinkled evenly on a surface of the first EVA film above the first mold;
- b) placing a first sand box on the first EVA film, sealing the first sand box with an upper plane of the exhaust box through the first EVA film, pouring dry sand into the first sand box and shaking the first sand box to increase dry sand density and fill all parts of the first sand box with the dry sand;
- c) smoothing a surface of the dry sand, placing a sprue cup in the dry sand, placing a heated and softened second EVA film on the dry sand covering the first sand box, exerting negative pressure between the first EVA film, the second EVA film, and the first sand box through the first sand box to harden the dry sand, and then releasing the negative pressure exerted by the exhaust box to separate the first EVA film and the first mold, thereby forming an upper box;
- d) using a third EVA film, a fourth EVA film, a second mold, and a second sand box to replace the first EVA film, the second EVA film, the first mold, and the first sand box, respectively, and not using the sprue cup to repeat step a) to step c) so as to form a lower box;
- e) assembling the upper box and the lower box with a casting space and a sprue formed therebetween, and sprinkling graphene powder on a portion of the second EVA film above the sprue cup;
- f) adding graphene powder to a smelting aluminum liquid and mixing, and pouring the smelting aluminum liquid mixed with graphene to the portion of the second EVA film above the sprue cup, wherein after vaporizing the portion of the second EVA film above the sprue cup, the smelting aluminum liquid mixed with graphene goes through the sprue to fill the casting space;
- and
- g) cooling the smelting aluminum liquid to a solid state, releasing the negative pressure exerted to the first sand box and the second sand box, and taking out a graphene aluminum casting formed in the casting space,
- wherein a shape of a combination of a portion of the first mold and a portion of the second mold is the same as that of the casting space.
Dependencies are inferred from the claim text.