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Composite powder and preparing method thereof

A technology of composite powder and mixed gas, applied in the direction of coating, etc., can solve the problems of poor bonding force between oxide and metal matrix, non-uniformity, non-dense, etc., and achieve the effect of dense structure, controllable thickness and high sphericity

Inactive Publication Date: 2014-04-30
XIHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This kind of preparation process is simple and low cost, but it is not uniform when mixed ball milling, and the bonding force between oxide and metal matrix is ​​poor, and it is not dense

Method used

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  • Composite powder and preparing method thereof
  • Composite powder and preparing method thereof
  • Composite powder and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, pure metal aluminum is used as the raw material. First, the raw material is heated and melted. The superheat of the molten aluminum is 100°C. The gas is sprayed and atomized, the mixed gas is a mixed gas of argon and oxygen, the volume percentage of oxygen is 10%, and the injection pressure is 1MPa during injection to obtain a composite powder. The cross-sectional view is as follows figure 1 As shown in the figure, the inner layer is the metal layer 2, and the outer layer is the oxide layer 1. The obtained composite powder is adhered with a conductive adhesive and analyzed by a scanning electron microscope, as shown in figure 2 shown.

[0033] From figure 1 and figure 2 It can be seen from the figure that the obtained aluminum powder is in a regular spherical shape, the sphericity is approximately equal to 1.0, and the particle size is between 50 and 100 μm.

[0034] The obtained powder is analyzed with an X-ray energy spectrometer, and a line scan...

Embodiment 2

[0036] In this embodiment, pure metal copper is used as the raw material, the superheat of the molten metal is 150°C, the mixed gas is argon and oxygen, and the volume percentage of oxygen is 80%, and the injection pressure is 1.5 MPa, and the rest are the same as in Embodiment 1. The cross-sectional view of the composite powder is obtained as Figure 6 As shown in the figure, the inner layer is a metal layer 2, and the outer layer is an oxide layer 1, and the oxide layer is obviously thicker than that in Example 1. The composite powder is spherical, the sphericity is approximately equal to 1.01, and the particle size is between 80 and 120 μm.

Embodiment 3

[0038]In this example, pure metal iron is used as the raw material, the superheat of the molten metal is 200°C, the heating temperature of the intermediate insulation bag and the catheter tube is 1100°C, the mixed gas is argon and oxygen, the volume percentage of oxygen is 50%, and the injection pressure is 2.0 MPa, all the other are identical with embodiment 1. A composite powder is obtained, the inner layer is a metal layer, and the outer layer is an oxide layer. The composite powder is in a regular spherical shape with a sphericity of approximately 1.0 and a particle size between 70 and 120 μm.

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Abstract

The invention provides a composite powder and a preparing method thereof and belongs to the field of material engineering. The composite powder is prepared with the method which includes the following steps that metal or alloy is smelted to obtain metal liquid or alloy liquid; in the time of smelting, the degree of superheat is controlled between 50 DEG C and 200 DEG C and the metal liquid or the alloy liquid naturally flows downwards; meanwhile, blended gases are used for spraying and atomizing the metal liquid or the alloy liquid and the composite powder is obtained after cooling is carried out. The inner core and the shell of the powder obtained in the method can form metallurgical bonding, coverage is compact, bonding force is strong, texture is compact and the degree of sphericity is high. As no chemical agents do not need to be used in preparing, the environment will not be polluted; in addition, in the time of preparing, the thickness of the shell of an oxide can be controlled by controlling the oxygen concentration in the blended gases, the thickness is controllable, the technological process is stable and controllable and processing in a batched mode can be carried out with high efficiency.

Description

technical field [0001] The invention relates to the field of material engineering, in particular to a composite powder and a preparation method thereof. Background technique [0002] Ultrafine powder usually refers to particles with a particle size of micron or even nanometer. Compared with bulk conventional materials, these particles have larger specific surface area, surface activity and higher surface energy, and usually exhibit special optical, electrical, magnetic and other physical properties. However, due to the unique small size effect and surface effect of ultrafine powder, it will cause agglomeration and dispersion problems, making it lose many excellent properties it should have. The solution is usually to modify the surface of the ultrafine powder to obtain new physical and chemical properties and even new functions on the surface of the particles. [0003] Metal oxide coating modification is carried out on the surface of the ultrafine powder, that is, the core...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/08
Inventor 周廷栋魏晓伟王宏斌唐祁峰杜浩
Owner XIHUA UNIV
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