Device and method for preparing metal-ceramic coated powder

A technology of coated powder and ceramic powder, which is applied in the field of composite powder material preparation, can solve the problems of melting point, large quality difference, insoluble ceramics, and inability to form coated powder, etc., achieve low content of impurity elements, avoid smelting difficulties, Improve the effect of two-phase separation

Active Publication Date: 2021-08-13
SINO EURO MATERIALS TECH OF XIAN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PREP still has technical constraints in the preparation of metal-ceramic coated powders. Due to the large difference in melting point and quality of metals and ceramics, it is difficult to smelt master alloy rods during conventional PREP powder making, and ceramics cannot Dissolved in metal, the subsequent machining of the rod is difficult; at the same time, ceramics are used as foreign objects to separate the metal matrix, and the bonding strength of the rod is poor, resulting in the risk of fracture during the PREP milling process. The difference in melting point between metal and ceramics leads to Under the action of the high and low melting point phase separation, the uniform coated powder cannot be formed during the powder preparation process
[0004] In view of the above problems, the existing patent CN212019387U discloses a device for preparing coated powder, which uses plasma to liquefy the metal / ceramic powder, and then uses the second powder particles as particles for coating, but because the second powder particles Spray coating is carried out in the form of solid, and the coating powder belongs to solid-liquid combination on the microscopic level, and the coating powder mostly exists in a bonded state, and its consistency and uniformity are poor

Method used

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  • Device and method for preparing metal-ceramic coated powder
  • Device and method for preparing metal-ceramic coated powder
  • Device and method for preparing metal-ceramic coated powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] This embodiment provides a method of preparing a metal-ceramic coating powder using a plasma rotary electrode device, the specific process is as follows:

[0056] Put the machine-machined φ60 × 500mm Inconel 718 master alloy rib 1 is loaded into the carrier box of the plasma rotating electrode equipment; start the vacuum assembly 10, and the atomization chamber 14 is vacuum to 5 × 10 -3 PA, then the argon is introduced, so that the pressure of the atomization chamber 14 is 0.5 MPa; the drive motor 13 is activated by the Inconel 718 mother, and the INCONEL 718 mother-in gold ribs 1 rotational speed rises to 16000R / min and smooth rotation After the plasma gun 6, the plasma gun 6 power is 100 kW, ionizing excitation plasma torch 5, plasma torch 5 melting the INCONEL 718 master co-gold ribs 1 end surface forming a metal liquid film 9; then activates the pneumatic powder apparatus 7, the average particle size is 2μm ceramic powder Al 2 O 3 Delivered to ceramic powder nozzles 3...

Embodiment 2

[0059] In this embodiment, it provides a method of preparing a metal-ceramic coating powder using a plasma rotating electrode device, and the specific process is as follows:

[0060] The 316L master alloy rib 1-machined φ70 × 600 mm 316L parent-binding bobbin is loaded into the plasma rotary electrode equipment; start the vacuum assembly 10, and the atomization chamber 14 is vacuum to 3 × 10 -3 PA, then an inert gas argon is passed, and the atomizing chamber 14 is 0.3 MPa; the drive motor 13 is activated by the 316L mother-in-gold ribs 1 to rotate, to be 316L mother-in-gold ribs 1 speed rises to 18000R / min and smooth rotation After the plasma gun 6, the plasma gun 6 power is 120 kW, the ionizing excitation plasma torch 5, the plasma torch 5 melted 316L mother-in gold ribs 1 end surface forming a metal liquid film 9; then activates the pneumatic powder powder device 7, the average particle size is 1.5 The ceramic powder Tin of μm is sent to the ceramic powder nozzle 3 by a powder...

Embodiment 3

[0063] In this embodiment, it provides a method of preparing a metal-ceramic coating powder 11 using a plasma rotating electrode device, and the specific process is as follows:

[0064] The COCR master alloy rib 1 of the machine-machined φ80 × 700 mm is loaded into the plasma rotary electrode equipment carrier box, activate the vacuum assembly 10, and the atomization chamber 14 is vacuumed to 2 × 10 -3 PA, then pass an inert gas argon, so that the pressure of the atomizing chamber 14 is 0.2 MPa; activation drive motor 13 drives the COCR mother-in-gold ribs 1 to rotate, to be CoCr master co-gold ribs 1 speed rises to 20000R / min and smooth rotation After the plasma gun 6, the plasma gun 6 is 140 kW, the ionizing excitation plasma torch 5, the plasma torch 5 melted the COCr mother-in gold ribs 1 to form a metal liquid film 9; then activate the pneumatic powder powder device 7, the average particle size is 2.5 The ceramic powder Wc of μm was sent to the ceramic powder nozzle 3 by a ...

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Abstract

The invention belongs to the technical field of preparation of composite powder materials, and particularly relates to a device and method for preparing metal-ceramic coated powder. By the adoption of the device, the problems that a metal-ceramic bar is difficult to smelt and the bar is fractured due to insufficient metal-ceramic bonding strength are solved. In the process of preparing metal spherical powder by PREP, ceramic powder sprayers are started to enable ceramic powder to enter a high-temperature plasma torch at an incident angle of 10-60 degrees, the surface of the ceramic powder is instantly liquefied under the high-temperature action of the plasma torch, but the core part of the ceramic powder is still kept in a solid state, and the ceramic powder is brought into metal liquid film on the end face of a bar through the plasma torch to be fused with the metal liquid film; the surface-liquefied ceramic powder and the molten metal are fused under the action of thermal capillary force, the molten metal wraps the surface-liquefied ceramic powder; and molten ceramic-based metal liquid drops are dispersed into an atomizing chamber under the action of centrifugal force and are solidified to form metal-ceramic coated powder which is high in sphericity degree, low in impurity content and uniform in coating.

Description

Technical field [0001] In particular, the present invention belongs to the preparation of composite powder materials, and more particularly to a device and method for preparing a metal-ceramic coating powder. Background technique [0002] Metal-ceramic coated powder with hard phase particles tungsten carbide, titanium nitride and alumina as a new type of functional material, a metal or alloy as a coat, is widely used in laser-cladding, plasma surfacing and thermal spraying Surface modification and repair processing applications. Metal-ceramic coated powder has advantages of uniform component with a mixed metal + ceramic powder, and the use of stable use of use, which is increasingly widely used in powder metallurgy. Conventional metal-ceramic coated powder production method has chemical replacement reduction, bonding sintering, vapor deposition, mechanical grinding, mechanical alloying, etc., however, the powder spherical is low, and the content of powder impurity element is high...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/14
CPCB22F9/14B22F1/17
Inventor 张智昶唐洪奎黄椿森卓君李安马宽周林瞿宗宏韩志宇赖运金王庆相梁书锦
Owner SINO EURO MATERIALS TECH OF XIAN CO LTD
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