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Nylon-coated metal tungsten radiation-shielding composite material and preparation method thereof

A technology of radiation shielding and composite materials, which is applied in the field of composite materials, can solve the problems of low mechanical strength and poor structural performance of shielding components, and achieve the effects of high bonding strength, short processing cycle and avoiding secondary bremsstrahlung

Inactive Publication Date: 2019-09-17
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

Metal lead is currently the most commonly used shielding material. Lead is cheap and has good shielding performance; but the disadvantages of lead are also obvious: secondary bremsstrahlung, large-sized shielding components with poor structural performance, and low mechanical strength. Lead itself is a source of heavy metal pollution

Method used

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  • Nylon-coated metal tungsten radiation-shielding composite material and preparation method thereof

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Embodiment Construction

[0027] The present invention will be further described in detail below in conjunction with specific embodiments.

[0028] A radiation shielding composite material of nylon-coated metal tungsten is prepared from the following components and raw materials: 20 parts of nylon powder for 3D printing, 80 parts of (spherical) tungsten powder, and 160 parts of industrial ethanol solvent.

[0029] The nylon powder for 3D printing is selected as EOSPA2200.

[0030] The tungsten powder is AVIC MET pure tungsten spherical powder with an average particle size of 20μm.

[0031] The technological process of nylon-clad metal tungsten radiation shielding composite material mainly includes the following steps:

[0032] 1. Put the set proportions of pure tungsten powder, nylon powder, ethanol solvent and antioxidant into the pilot-scale reactor, vacuum the reactor with a vacuum pump, and then pass nitrogen for inert gas protection.

[0033] 2. Start the stirring paddle of the reaction kettle t...

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Abstract

The invention discloses a nylon-coated metal tungsten radiation-shielding composite material and a preparation method thereof. The preparation method comprises the steps: mixing nylon, tungsten powder, an ethanol solvent and other substances in a reaction kettle, performing heating until complete dissolution of the nylon, then controlling temperature lowering precisely so as to precipitate the nylon and coat the precipitated nylon on the surface of tungsten powder particles, opening the reaction kettle, performing filtration, collecting the ethanol solvent so as to obtain nylon-coated tungsten composite powder aggregate, and performing drying, stirring, dispersion, powder flow guiding and other post-treatment so as to obtain the nylon-coated tungsten composite powder which is suitable for selective laser sintering forming. The nylon powder is nylon powder specific for 3D printing, has reliable performance and stable selective laser sintering forming. The nylon-coated metal tungsten radiation-shielding composite material has excellent performance, good fluidity and a good nylon coating effect, requirements of forming in an SLS process are met fully, and molding of a structural member with excellent radiation shielding performance, no toxicity, environmental protection and good mechanical properties can be achieved through a selective laser sintering process.

Description

technical field [0001] The invention relates to a composite material, which is used in the field of laser selective sintering and molding, in particular to a nylon-clad metal tungsten radiation shielding composite material and a preparation method thereof. Background technique [0002] Selective Laser Sintering (SLS) is a rapid prototyping technology based on computer-controlled laser sintering of polymer powders. The laser selective sintering equipment can directly form the required model or functional parts according to the 3D CAD model of the part, especially some parts with complex geometric structures. The use of SLS technology can realize the rapid prototyping of complex shapes and composite functional parts, with high forming efficiency and low cost. [0003] The molding materials used in selective laser sintering (SLS) are all powdered materials. Materials suitable for SLS molding must have good thermoplastic (solid) properties, moderate thermal conductivity, a nar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L77/02C08K3/08
CPCC08K3/08C08K2003/0887C08K2201/003C08L77/02
Inventor 杨永强付凡万佳勇宋长辉王迪
Owner SOUTH CHINA UNIV OF TECH
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