Device and method for preparing coated powder

A technology for coating powder and powder particles, which is applied in the field of preparation of composite powder materials and can solve the problems of difficulty in powder feeding, reduction of coating performance of coating powder preparation, and low efficiency of coating powder, etc.

Pending Publication Date: 2020-05-22
YANGJIANG HIGH POWER LASER APPLICAITON LAB CO LTD +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the existing technology has solved some problems in the field of powder metallurgy and coating preparation to a certain extent, such as easy oxidation, difficulty in powder feeding, uneven coating distribution, etc., the above methods have shortcomings:
It is also very easy to absorb moisture during the preparation process, and the powder particles are damp, which affects the coating performance
[0006] 2. If the coated powder is prepared by mechanical alloying or ball milling, the original shape of the hard phase particles is broken, such as the spherical shape becomes an irregular shape, which not only changes the good performance of the hard phase , will also greatly reduce the performance of the coated powder prepared coating
In addition, this method must also take into account the interface between two different materials.
[0007] 3. In addition, the efficiency of preparing coated powder in the prior art is low. After the preparation is completed, the powder with a suitable particle size should be sieved as the coated powder; only low melting point coated high melting point coated powder can be used, such as tin-clad copper , nickel-coated titanium carbide, etc., it is impossible to prepare coated powders with high-melting-point materials coated with low-melting-point materials

Method used

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  • Device and method for preparing coated powder
  • Device and method for preparing coated powder
  • Device and method for preparing coated powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0101] Example 1 A device for preparing coated powder and its application method

[0102] Such as figure 1 Described coated powder device comprises:

[0103] Plasma torch 10: the plasma torch 10 is used to generate a plasma heat source 15 to melt and / or gasify the powder particles A21. In this embodiment, the plasma torch 10 is an inductively coupled plasma torch. Further, the plasma torch 10 includes a powder feeding probe 11 , an induction coil 12 , a plasma confinement tube 13 and a plasma torch wall 14 .

[0104] The atomizing nozzle 16 ; the atomizing nozzle 16 communicates with the plasma torch 10 and is used to make the melted and / or gasified powder particles A21 form a metal jet 23 .

[0105] The first powder feeder 62 : the first powder feeder 62 communicates with the plasma torch 10 and is used to deliver the powder particles A21 to the plasma torch 10 . Further, the first powder feeder 62 is in fluid connection with the powder feeding probe 11 . The first powde...

Embodiment 2

[0121] Example 2 A device for preparing coated powder and its use method

[0122] Such as figure 2 Described coated powder device comprises:

[0123] Plasma torch 10: the plasma torch 10 is used to generate heat source plasma 15 to melt and / or gasify powder particles A. In this embodiment, the plasma torch 10 is a direct current plasma torch. The DC plasma spray gun includes: a tungsten electrode 101 , a central gas channel 102 , a gun body 104 , a built-in cooling water pipe 103 , and a powder feeding channel 105 . The tungsten electrode 101 is installed in the center of the gun body, the tungsten electrode 101 is connected to the negative pole of the power supply, and the gun body is connected to the positive pole of the power supply, a breakdown voltage is generated between the tip of the tungsten electrode and the lower end of the gun body, and the inert gas is broken down to generate a plasma heat source. The central gas channel 102 surrounds the tungsten electrode an...

Embodiment 3

[0140] Embodiment 3 A kind of method for preparing coating powder

[0141] The heat source selects the inductively coupled plasma heat source as the heat source to heat the powder particles A so that they are directly vaporized from the solid particles to the metal jet. Nickel-based alloy powder Ni60 is selected as powder particle A with a particle size of 5-75 μm; hard phase tungsten carbide is selected as powder particle B with a particle size of 15-120 μm and the powder shape is spherical to prepare nickel alloy coated tungsten carbide coating powder .

[0142] Other parameters are as follows: flow rate of central gas argon: 10L / min; power of induction coil: 10KW; ratio of mixed gas: argon / hydrogen = 30L / min: 4L / min; powder feeding rate of powder particle A: 8g / min ; Powder feeding rate of powder particle B: 15g / min; The feeding direction of powder particle B and the feeding direction of powder particle A are at an angle of 90 degrees. The appearance of the prepared coate...

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Abstract

The application discloses a device and a method for preparing coated powder. The device mainly comprises a plasma torch, an atomizing nozzle, a reactor, a first powder feeder and a second powder feeder. The method for preparing the coating powder comprises the following steps of step S1, generating a heat source plasma; step S2, sending powder particles A into the plasma; step S3, sending powder particles B into a metal jet generated by the powder particles A; and step S4, preparing the coated powder A and B. The coated powder has the characteristics of low oxygen content and impurity content,no foreign pollution, high fluidity and the like, solves the problem of difficulty in feeding fine powder particles in the field of powder metallurgy, solves the problem of uneven hard phase distribution in the field of coating preparation, improves the mechanical properties of molded parts.

Description

technical field [0001] The present application relates to the technical field of preparation of composite powder materials, in particular to a device for preparing coated powder and a method for coating powder. Background technique [0002] In the preparation process of powder metallurgy products and high-performance coatings, the quality of the composite powder composed of raw materials and hard strengthening phase plays a key role. If the raw material or hard phase particles are too fine, various problems will occur, such as fine powder Particles are easily oxidized due to their small size effect resulting in increased surface active sites, large specific surface area, and large specific surface energy. For oxygen-sensitive metal materials, when the metal powder is oxidized, the oxygen content of the raw material will increase. It will not only affect the press formability of the powder, but also seriously affect the various properties of the final product. The smaller th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/14B22F1/00
CPCB22F9/14B22F1/065B22F1/054B22F1/17
Inventor 张瑞华路超肖梦智栗子林康平尹燕刘燕红邱桥华炳钟
Owner YANGJIANG HIGH POWER LASER APPLICAITON LAB CO LTD
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