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

Inactive Publication Date: 2015-01-28
NANCHANG HANGKONG UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Due to the poor thermal conductivity of the coated sand and the short irradiation time of the laser beam, the sintered parts of the coated sand generally have defects such as low initial strength of sintering and poor surface quality, and the content of the binder is high, resulting in the occurrence of sand molds (cores). Large air volume, poor air permeability and collapsibility, it is difficult to meet the production requirements of complex castings with high quality and high performance

Method used

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  • Carbon fiber-based precoated sand material for selective laser sintering and preparation method thereof

Examples

Experimental program
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Effect test

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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Abstract

The invention discloses a carbon fiber-based precoated sand material for selective laser sintering and a preparation method thereof. The carbon fiber-based precoated sand material comprises chopped carbon fibers, crude sand, an organic binder, a curing agent, a lubricant, a coupling agent and a dispersant. The preparation method comprises the following steps of carrying out surface modification treatment on the chopped carbon fibers, heating the crude sand, adding resin, adding a part of calcium stearate and a prepared coupling agent aqueous solution, adding a chopped fiber-containing urotropine curing agent, adding the rest of the calcium stearate, carrying out cooling and carrying out screening and sand discharge to obtain the product. The carbon fiber-based precoated sand material has the advantages that 1, the carbon fibers have thermal conduction effects, limit integral shrinkage of a sintered part to a certain degree and reduce warp phenomenon in molding, and 2, through laser sintering, the precoated sand substantially improves resin precoated sand thermostability, promotes curing reaction of phenolic resin at locals in the sintered layer and between the sintered layers and obviously improves laser sintering forming part blank strength.

Description

technical field [0001] The invention belongs to the field of new materials, and in particular relates to a carbon fiber-based coated sand material for selective laser sintering and a preparation method thereof. Background technique [0002] Selective laser sintering technology (SLS) is a solid freeform fabrication technology (Solid Freeform Fabrication, SFF) that uses laser as a controllable heat source to selectively sinter powder materials. And manufacturing, through layered slice processing of the 3D CAD model of the part, the cross-sectional profile information of each layer is obtained, and then the solid powder material is sintered, so that the layers are bonded to each other and gradually superimposed, so as to quickly obtain the three-dimensional entity. It is not restricted by the complexity of the shape and structure of the parts, does not require any tooling and molds, and has a short manufacturing cycle and low production costs. Coated sand is one of the common...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22C1/00B22C1/22B22C1/02
CPCB22C1/00B22C1/02B22C1/2233
Inventor 芦刚毛蒲严青松卢百平余欢
Owner NANCHANG HANGKONG UNIVERSITY
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