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Irradiation gel casting forming method

A gel injection molding and irradiation technology, which is applied in the field of powder forming, can solve the problems of continuous operation of the curing method, insufficient mixing of the initiator, and difficult control of the curing time, and achieve cross-linking conditions and excellent performance. Long, small footprint effect

Inactive Publication Date: 2015-01-07
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the difficulty in controlling the curing time of chemical cross-linked gel injection molding and because the curing time is short, it is easy to cause insufficient and uneven mixing of the initiator when preparing large-scale products, and some areas cannot be completely polymerized to form Defects, problems that ultimately affect product performance, and current curing methods that cannot achieve continuous operation and are difficult to industrialize; use new radiation cross-linking instead of chemical cross-linking to trigger the formation of a network structure between polymer chains, so as to achieve gel The continuous work of injection molding provides a technical basis for its industrialization

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Example 1: Irradiation gel injection molding of iron-based parts.

[0021] 1. The solvent toluene and the organic monomer β-hydroxyethyl methacrylate (HEMA) were prepared at a volume ratio of 3:7 to prepare a uniform and stable premix;

[0022] 2. The iron powder with an average particle size of 50 μm and the premix solution are prepared into a slurry at a volume ratio of 1:5, and 0.02% of the weight of the premix solution is added as a dispersant oleic acid to prepare a slurry;

[0023] 3. Inject the slurry into the mold, and irradiate it with electron beams at a dose rate of 1000Gy / min at 100°C and a nitrogen atmosphere, and solidify after 1min. The irradiation dose is 1×10 3 Gy;

[0024] 4. After demoulding, vacuum-dry the green body at 100°C for 4 hours to obtain a formed metal green body with a strength of 26 MPa.

Embodiment 2

[0025] Example 2: Irradiation gel injection molding of titanium structural parts.

[0026] 1. The solvent toluene and the organic monomer β-hydroxyethyl methacrylate (HEMA) are prepared in a volume ratio of 3:2 to prepare a uniform and stable premix;

[0027] 2. Prepare titanium hydride powder with an average particle size of 1 μm and the premix solution at a volume ratio of 5:1 to make a slurry, and add 0.4% of the weight of the premix solution as a dispersant oleic acid to prepare a slurry;

[0028] 3. Inject the slurry into the mold and use it in vacuum at -50°C 60 Co-γ rays were irradiated at a dose rate of 5Gy / min, solidified after 60min, and the irradiation dose was 3×10 2 Gy;

[0029] 4. After demolding, vacuum-dry the green body at 40°C for 2 hours to obtain a formed metal green body with a strength of 32 MPa.

Embodiment 3

[0030] Example 3: Irradiation gel injection molding of tungsten.

[0031] 1. The solvent toluene and the organic monomer β-hydroxyethyl methacrylate (HEMA) are prepared at a volume ratio of 1:1 to prepare a uniform and stable premix;

[0032] 2. The tungsten powder with an average particle size of 11 μm and the premix solution are prepared into a slurry at a volume ratio of 1:1, and 0.15% of the weight of the premix solution is added as a dispersant oleic acid to prepare a slurry;

[0033] 3. Inject the slurry into the mold, and irradiate it with an electron beam at a dose rate of 600Gy / min at 20°C and in an air atmosphere, and solidify after 30 minutes. The irradiation dose is 1.8×10 4 Gy;

[0034] 4. After demolding, vacuum-dry the green body at 50°C for 3 hours to obtain a formed metal green body with a strength of 29 MPa.

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Abstract

The invention provides an irradiation gel casting forming method of metal parts, and belongs to the technical field of manufacturing of metal parts in the powder metallurgy production process. The method is characterized in that solvent toluene and organic monomer methylacrylic acid beta-hydroxy ethyl methacrylate are mixed according to a certain volume ratio to prepare pre-mixing liquid; powder and dispersing agent oleic acid are added into the pre-mixing liquid to prepare sizing agent good in liquidity; the sizing agent is poured into a mold, and irradiation processing is performed under certain conditions until curing forming is completed. Through adjustment of irradiation dosage amount and the dosage rate, organic monomer crosslinking degree is increased, blank body curing forming time is accurately controlled, and meanwhile, blank body strength is improved. Compared with chemical crosslinking, irradiation crosslinking can be performed at normal temperature and is convenient to control, wide in application range and suitable for material on which the chemical crosslinking can not be performed. Besides, the irradiation crosslinking is low in process cost, energy and material are saved, and the method is suitable for mass production.

Description

technical field [0001] The invention relates to a powder forming technology, which belongs to the field of parts preparation in the powder metallurgy production process, and in particular provides a gel injection molding method with high controllability, wide application range, high efficiency, low cost and low energy consumption . technical background [0002] Gel injection molding is a combination of traditional slurry forming and polymer chemistry. Its principle is to prepare a premix solution with a certain concentration of organic monomers and solvents. Under certain conditions, the monomers are cross-linked and polymerized to form a three-dimensional network polymer gel. Glue, which makes the powder bond and solidify into shape. As a novel near-net shape technology, it has great application potential in the field of large-size and complex-shaped parts preparation technology. [0003] The traditional gel injection molding process uses chemical methods to achieve cross...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/22
Inventor 郭志猛段启凯杨春雷徐晓娟章彦娴梁毅叶青张欣悦
Owner UNIV OF SCI & TECH BEIJING
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