CN-121972650-A - Metal composite powder and preparation method and application thereof

Abstract

The invention provides a preparation method of metal composite powder, which relates to the technical field of metal powder and comprises the following steps of pre-drying the added particles and the metal powder with a microstructure on the surface at 70-150 ℃, then mixing, and embedding the added particles into the microstructure of the metal powder by adopting one of rolling, vibrating or stirring modes to obtain the metal composite powder. The submicron microstructure on the surface of the metal powder is used as an embedding site, so that the externally added particles are embedded into the microstructure, and mechanical locking is realized, so that stable combination is formed, and meanwhile, the sphericity of the powder is ensured.

Inventors

• LI JINGUO
• SUN DA
• SONG WEI
• LIANG JINGJING
• XIE JUN

Assignees

• 中国科学院金属研究所

Dates

Publication Date

20260505

Application Date

20251229

Claims (10)

1. 1. A method for preparing metal composite powder, comprising the steps of: And mixing the additional particles with the metal powder with the microstructure on the surface, and embedding the additional particles into the microstructure of the metal powder to obtain the metal composite powder.
2. 2. The method of claim 1, wherein the microstructure comprises one or more of pits, grooves, and holes.
3. 3. The method for producing a metal composite powder according to claim 1, wherein the particle size of the additional particles is 0.01 to 2 μm, and/or The additional particles are oxide particles, carbide particles, nitride particles, boride particles, intermetallic compound particles or composite particles.
4. 4. The method of claim 1, wherein the additional particles are embedded in the microstructure of the metal powder by one of rolling, vibrating or stirring.
5. 5. The method for producing a metal composite powder according to claim 4, wherein the rolling is performed at a rotational speed of 10 to 100rpm for a period of 5 to 60 minutes.
6. 6. The method of producing a metal composite powder according to claim 1, wherein the volume ratio of the metal powder to the additional particles is 100:0.05-10, and/or The mass ratio of the metal powder to the added particles is 100:0.1-10.
7. 7. The method for producing a metal composite powder according to claim 1, wherein the metal powder and the additional particles are subjected to a pre-baking treatment before the mixing treatment; preferably, the temperature of the pre-drying treatment is 70-150 ℃.
8. 8. The metal composite powder is characterized by comprising a metal powder matrix and additional particles, wherein the surface of the metal powder matrix is provided with a microstructure, and the additional particles are embedded in the microstructure.
9. 9. The metal composite powder according to claim 8, wherein the sphericity factor of the metal composite powder is >0.85; Preferably, the metal composite powder is obtained by the preparation method according to any one of claims 1 to 7.
10. 10. Use of the metal composite powder according to claim 8 or 9, characterized in that the metal composite powder is used in additive manufacturing, thermal spraying or powder metallurgical forming processes.

Description

Metal composite powder and preparation method and application thereof Technical Field The invention belongs to the technical field of metal powder, and particularly relates to metal composite powder, and a preparation method and application thereof. Background In the preparation process of the metal powder composite material, how to realize stable, uniform and controllable combination of the external particles and the matrix powder is always one of the core technical problems in the field. In particular in the field of additive manufacturing, the powder properties have a decisive influence on the structural homogeneity and mechanical properties of the shaped parts. Traditional powder mixing methods mainly comprise high-energy ball milling, acoustic resonance, ultrasonic vibration and other modes, and although the methods can realize certain degree of particle mixing and adhesion, the methods still have significant defects. The high-energy ball milling method generates strong mechanical impact in the mixing process, is easy to damage the spherical structure of metal powder, causes the problems of powder fluidity reduction, particle agglomeration, surface pollution and the like, thereby influencing the powder laying uniformity and the forming stability in the additive manufacturing process, and although the methods such as acoustic resonance, ultrasonic vibration and the like can improve the dispersibility, the equipment is expensive, the energy consumption is high, the process is complex, and an economic and efficient scheme suitable for industrial production is lacking. In view of the above, it is necessary to provide a method for producing a metal composite powder which ensures powder flowability and stably bonds the additional particles to the matrix powder. Disclosure of Invention Accordingly, the present invention provides a metal composite powder, a method for preparing the same, and an application thereof, and a main object is to obtain a metal composite powder having excellent powder flowability and stable bonding of additional particles with a matrix powder. In order to solve the above problems, in one aspect, the present invention provides a method for preparing metal composite powder, comprising the steps of: And mixing the additional particles with the metal powder with the microstructure on the surface, and embedding the additional particles into the microstructure of the metal powder to obtain the metal composite powder. Further, the microstructure comprises one or more of pits, grooves and holes. Further, the particle size of the additional particles is 0.01-2 μm, and/or The additional particles are oxide particles, carbide particles, nitride particles, boride particles, intermetallic compound particles or composite particles. Further, the additional particles are embedded in the microstructure of the metal powder by one of rolling, vibrating or stirring. Further, when a rolling mode is adopted, the rolling rotating speed is 10-100rpm, and the rolling time is 5-60min. Further, the volume ratio of the metal powder to the additional particles is 100:0.05-10, and/or The mass ratio of the metal powder to the added particles is 100:0.1-10. Further, pre-drying the metal powder and the added particles before the mixing treatment; preferably, the temperature of the pre-drying treatment is 70-150 ℃. In another aspect, the present invention provides a metal composite powder comprising a metal powder matrix and additional particles, wherein the surface of the metal powder matrix has a microstructure, and the additional particles are embedded in the microstructure. Further, the sphericity factor of the metal composite powder is >0.85; preferably, the metal composite powder is obtained by the preparation method described in any one of the above. In yet another aspect, the present invention provides the use of a metal composite powder as described above for additive manufacturing, thermal spraying or powder metallurgy forming processes. The metal composite powder and the preparation method and application thereof provided by the invention have the following beneficial effects: 1. In one aspect, the invention provides a method for preparing a metal composite powder, comprising the steps of mixing additional particles with a metal powder having a microstructure on the surface, and embedding the additional particles into the microstructure of the metal powder to obtain the metal composite powder. It should be noted that, the submicron microstructure on the surface of the metal powder is used as an embedding site, so that the externally added particles are embedded into the microstructure to realize mechanical locking, thereby forming stable combination and ensuring sphericity of the powder. 2. Furthermore, the low-energy mechanical action (the rolling rotating speed is 10-100 rpm) is adopted, so that the change of the powder morphology and the reduction of the fluidity caused by high-energy ball milling are av