Composite powder coated by ultramicro or Nano metal powder, and preparation method

A technology of nanometer metal powder and composite powder, which is applied in coating and other directions

Inactive Publication Date: 2007-07-25
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report on improving the performance of coated composite powder and its preparation method by using nanometer metal powder instead of micron metal powder

Method used

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  • Composite powder coated by ultramicro or Nano metal powder, and preparation method
  • Composite powder coated by ultramicro or Nano metal powder, and preparation method
  • Composite powder coated by ultramicro or Nano metal powder, and preparation method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0027] 1. Preparation of ultrafine or nanometer metal powder

[0028] Use known methods (including chemical crystallization or physical methods) to prepare ultrafine or nanometer metal powders or use commercially available products.

[0029] 2. Reunion coating process

[0030] The steps of the agglomeration coating process actually include: loading the core powder, adding a binder, adding a part of ultrafine or nanometer metal powder, pre-coating, stirring, adding the remaining ultrafine or nanometer metal powder, coating and stirring, Curing and drying, unloading. The coating process is carried out on a stirring device.

[0031] The particle size distribution of the core powder is controlled to be slightly finer than the final particle size requirement, while the average particle size of the ultrafine or nanometer metal powder can usually be adjusted in the range of 20-850nm.

[0032] In order to ensure the effect of coating and stirring, the charging amount should be cont...

Embodiment 1

[0035] Preparation of nano-aluminum clad nickel-chromium alloy composite powder. Prepare nano-aluminum powder according to a conventional method, and its average particle size is 50-150nm; and select nickel-chromium alloy powder with an average particle size of 20-120 μm: and weigh according to the following proportions, nano-aluminum powder 4wt%, bonding The agent is 5wt%, and the balance is nickel-chromium alloy. Use a stirring device to coat and stir, and proceed according to the following steps. First, put the above-mentioned weight of nickel-chromium alloy powder and 20% of nano-aluminum powder into the stirring device, then add the above-mentioned weight of binder, and start the stirring device Pre-coating and stirring are carried out, and then the remaining 80% of nano-aluminum powder is added for coating and stirring. Wherein, the total volume of the nickel-chromium alloy, the binder, and the nano-aluminum powder accounts for 50% of the volume of the stirring device. ...

Embodiment 2

[0046] Preparation of nano-aluminum coated tungsten carbide-iron chromium borosilicate composite powder. Prepare nano-aluminum powder according to the conventional method, and its average particle size is 50-150nm; and select tungsten carbide and iron-chromium-borosilicate powder with an average particle size of 45-200 μm: and weigh according to the following ratio, nano-aluminum powder 8wt %, the binder is 6wt%, and the balance is a 1:1 mixed powder of tungsten carbide and iron chromium borosilicate. Use a stirring device for coating and stirring, and proceed according to the following steps. First, put the core powder of the above weight and 30% of nano-aluminum powder into the stirring device, then add the binder of the above weight, and start the stirring device for pre-packing Cover and stir, and then add the remaining 70% of nano-aluminum powder for coating and stirring. Wherein, the total volume of the core powder, the binder, and the nano-aluminum powder accounts for ...

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Abstract

A superfine or nano-class metallic powder clad composite powder is composed of a core particle made of the metal (Ni or stainless steel), the carbide (tungsten carbide or chromium carbide), alloy (NiCr), self-smelting alloy (NiCrBSi), or their composition, and a cladding layer made of superfine or nano-class metal particles (Al, Mo, or Co). It can be used for hot spray coating or powder metallurgy. Its preparing process is also disclosed.

Description

technical field [0001] The invention relates to a composite powder coated with ultrafine or nanometer metal powder and a preparation method thereof, belonging to the fields of thermal spraying and powder metallurgy. In particular, it involves agglomerating and coating one or several kinds of ultrafine or nanometer metal powders on the surface of one or several kinds of relatively coarse core particles (20-200 μm) by using an adhesive to prepare coated composite powder. technical background [0002] Coated composite powder is an important class of thermal spraying and powder metallurgy materials. Thermal spraying technology is to heat a certain powdery, linear or rod-shaped material to a molten or semi-molten state through a heat source such as a flame, an electric arc or a plasma, and accelerate the formation of high-speed molten droplets, which are sprayed onto the substrate to form a coating on it. It can strengthen or regenerate the surface properties of the workpiece (s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02
Inventor 于月光曾克里任先京许根国陈舒予尹春雷李敦钫魏伟
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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