Method for preparing nylon coating film metal powder material

A metal powder and nylon technology, applied in the coating and other directions, can solve the problems of high equipment requirements, poor fluidity, irregular shape of polymer-coated metal powder particles, etc., to simplify the preparation process, and to achieve good fluidity and dispersion. Effect

Active Publication Date: 2007-09-19
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 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 heat and pressure for 2 hours.

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

Embodiment 2

[0040] (1) Get 1000 grams of O0Cr17Ni14Mo2 stainless steel powder whose particle size distribution is between 10 microns and 50 microns and whose powder particle shape is nearly spherical. The particle size distribution is between 10 microns and 50 microns. 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 keep the temperature and pressure for 3 hours.

[0042] (3) Under vi...

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 making method of nylon cover membrane metallic powder material, first heating mixture of nylon resin, solvent, metallic powder and antioxidant in the closing container, dissolving the nylon in the solvent, then gradually cooling, making the nylon as nucleus of metal granular, and gradually crystaling and coating on the surface of metal granular, by vacuum drying, ball milling, screening to select powder distributing by certain particle diameter namely the nylon cover membrane metallic powder material. The material made by the invention has superior sintering performance and good flow characteristics, without containing impurity difficult to remove by after-treatment process. The material has less nylon content, but the SLS original blank has higher accuracy and intensity. Thereby the invention is adapted to SLS indirect making metalwork.

Description

technical field [0001] The invention belongs to the field of material preparation in advanced rapid manufacturing, and in particular relates to a method for preparing a nylon-coated metal powder material. The nylon-coated metal powder material prepared by the method is especially suitable for selective laser sintering (SLS) rapid indirect manufacturing metallic parts. technical background [0002] Selective laser sintering uses solid powder (such as polymers, ceramics, coated metals, etc.) Prototype 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 manufacturing m...

Claims

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Application Information

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Patent Type & Authority Applications(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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