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Method for preparing nylon coating film metal powder material

A metal powder, nylon technology, applied in the direction of coating, can solve the problems of poor fluidity, high equipment requirements, adverse effects on the performance of metal parts, etc., to achieve the effect of good fluidity and dispersion, and simplify the preparation process

Active Publication Date: 2009-06-24
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the preparation process of coating powder is relatively complicated, and the requirements for equipment are very high.
[0005] In addition, the shape of polymer-coated metal powder particles prepared by known methods is irregular and their fluidity is poor. It is necessary to add a certain amount of inorganic fillers such as nano-silica to improve their fluidity. Difficult to remove during processing, thus adversely affecting final metal part properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] (1) Take 1000 grams of Fe-Cu-Ni alloy powder with a particle size distribution between 10 microns and 50 microns and a powder particle shape that is nearly spherical, 20 grams of nylon 12 resin, 160 grams of mixed solvent and 0.02 grams of composite antioxidant. In a stainless steel 50L reaction kettle with a jacket, seal the reaction kettle, vacuumize, and pass N 2 gas protection. The proportioning ratio of the mixed solvent is: 85% ethanol, 1% distilled water, 10% ethylene glycol, 4% propylene glycol. The proportioning of composite antioxidant is: 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene is 80%, tetrakis(2 , 4-di-tert-butylphenyl)-4,4'-biphenyl bisphosphite was 20%.

[0035] (2) Gradually raise the temperature to 150°C at a rate of 1°C / min to completely dissolve the nylon 12 in the solvent, and keep the temperature and pressure for 2 hours.

[0036](3) Under vigorous stirring, gradually cool down to room temperature at a rate of 2°C / min,...

Embodiment 2

[0040] (1) Get 1000 grams of 00Cr17Ni14Mo2 stainless steel powder with a particle size distribution between 10 microns and 50 microns and a powder particle shape that is nearly spherical; the particle size distribution is between 10 microns and 50 microns, and the powder particle shape is a nearly spherical nylon 11 resin 16 gram, 128 grams of mixed solvent and 0.048 grams of composite antioxidant drop into the stainless steel 50L reaction kettle with jacket, the reaction kettle is sealed, vacuumized, and connected to N 2 gas protection. The proportioning of mixed solvent is: 80% ethanol, 2% distilled water, 15% ethylene glycol, 3% propylene glycol. The proportioning of composite antioxidant is: 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene is 80%, tetrakis(2 , 4-di-tert-butylphenyl)-4,4'-biphenyl bisphosphite was 20%.

[0041] (2) Gradually raise the temperature to 150° C. at a rate of 2° C. / min to completely dissolve the nylon 11 in the solvent, and ...

Embodiment 3

[0046] (1) Take 1000 grams of copper powder with a particle size distribution of 10 microns to 50 microns and a powder particle shape that is nearly spherical, 8 grams of nylon 11 resin, 8 grams of nylon 1212 resin, 128 grams of mixed solvent and 0.032 grams of composite antioxidant Put it into a jacketed stainless steel 50L reaction kettle, seal the reaction kettle, vacuumize, and pass through N 2 gas protection. The proportioning of mixed solvent is: 80% ethanol, 2% distilled water, 15% ethylene glycol, 3% propylene glycol. The proportioning of composite antioxidant is: 1,3,5-trimethyl-2,4,6-tris(3,5-di-tert-butyl-4-hydroxybenzyl)benzene is 80%, tetrakis(2 , 4-di-tert-butylphenyl)-4,4'-biphenyl bisphosphite was 20%.

[0047] (2) Gradually raise the temperature to 160°C at a rate of 2°C / min to completely dissolve nylon 11 and nylon 1212 in the solvent, and keep the temperature and pressure for 3 hours.

[0048] (3) Under rapid stirring, gradually cool down to room temperat...

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Abstract

The invention discloses a method for preparing nylon-coated metal powder materials. First, the mixture of nylon resin, solvent, metal powder and antioxidant is heated in a closed container to dissolve nylon in the solvent, and then gradually cooled to make nylon The metal particle is the nucleus, which is gradually crystallized and coated on the surface of the metal particle. After vacuum drying, ball milling, and screening, the powder with a certain particle size distribution is selected as the nylon coated metal powder material. The material prepared by the invention has excellent sintering performance and good fluidity, and does not contain impurities that are difficult to remove in post-treatment processes. The nylon content in the material is low, and the SLS initial shape has higher precision and strength. Therefore, it is very suitable for SLS indirect manufacturing of metal parts.

Description

technical field [0001] The invention belongs to the field of material preparation in advanced rapid manufacturing, and specifically relates to a method for preparing nylon-coated metal powder materials. The nylon-coated metal powder materials prepared by this method are especially suitable for rapid indirect manufacturing of selective laser sintering (SLS) metallic parts. technical background [0002] Selective laser sintering uses solid powder (such as polymers, ceramics, coated metals, etc.) Prototypes or parts needed. This method has the characteristics of wide range of forming materials, the manufacturing process is not limited by the complexity of parts, high manufacturing efficiency and low cost. [0003] Due to the wide variety of metal parts, superior performance and wide application, the use of SLS technology to directly or indirectly rapidly manufacture metal parts is a research hotspot in various countries in the world today. There are two methods of manufactur...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F1/02
Inventor 史玉升闫春泽杨劲松黄树槐
Owner HUAZHONG UNIV OF SCI & TECH
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