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Core-shell structure composite powder and preparation method thereof

A technology of composite powder and shell structure, which is applied in metal processing equipment, transportation and packaging, coating, etc., can solve the problems of complex solution chemical reaction and increase the difficulty of operation, and achieve simple process, wide application range and good industrial application prospect Effect

Pending Publication Date: 2022-07-22
GANNAN NORMAL UNIV +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the sol-gel nano-precursor preparation technology proposed in this invention needs to go through more complex solution chemical reactions and precise reaction condition control, which increases the difficulty of large-scale industrial production.

Method used

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  • Core-shell structure composite powder and preparation method thereof
  • Core-shell structure composite powder and preparation method thereof
  • Core-shell structure composite powder and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A core-shell structure composite powder is made of deionized water, metal salts, powder particles, and a gelling agent as raw materials. The amount is 1 to 4 times the total mass of the metal salt and powder particles; the powder particles are one or more of refractory metals and hard materials mixed in any ratio, and the refractory metals are tungsten, molybdenum, tantalum, niobium, zirconium, hafnium , vanadium, chromium, titanium, rhenium, ruthenium or rhodium mixed in any ratio; hard materials are tungsten carbide, molybdenum carbide, titanium carbide, titanium nitride, titanium carbonitride, tantalum carbide, silicon carbide , niobium carbide, titanium boride, tantalum boride, vanadium boride, chromium boride, zirconium boride, tungsten boride, molybdenum boride, niobium boride, aluminium oxide, zirconium oxide, magnesium oxide or beryllium oxide One or more are mixed in any ratio.

[0037] The gelling agent is one or more of polyvinylpyrrolidone, carboxymethylcel...

Embodiment 2

[0040] A preparation method of a core-shell structure composite powder is specifically carried out according to the following steps:

[0041] S1, wetting the insoluble metal salt with deionized water to obtain the wet metal salt, the mass ratio of the deionized water to the metal salt is 0.2 to 2.0, the function is to facilitate the formation of an ice coating layer on the surface of the metal salt in the later stage , too little water cannot form an ice coating structure, and too much water will form hard large ice blocks, which cannot be broken by ball milling.

[0042] The metal salt is a metal carbonate, hydroxycarbonate or oxalate, and the metal is one or more of Co, Ni, Fe, Mn, Cu, Zn or Sn mixed in any ratio; preferably metal Co, One or more of Ni, Fe, and Cu, the metal salts are easily decomposed, and the decomposed products are environmentally friendly.

[0043] S2, freezing the wet metal salt at a freezing temperature of -1 to -18° C. to form an ice coating layer on...

Embodiment 3

[0051] A preparation method of a core-shell structure composite powder is specifically carried out according to the following steps:

[0052] S1, spray 5g of deionized water in the mixture of 28.2g of cobalt carbonate and 4.1g of nickel carbonate to make it wet; the mass ratio of the added mass of deionized water to the metal salt is 0.155;

[0053] S2, freezing the wet cobalt carbonate and nickel carbonate mixture at a temperature of -8°C to form an ice coating layer on the surface of the cobalt carbonate and nickel carbonate to obtain a cobalt carbonate-nickel carbonate-ice solid mixture;

[0054] S3, add the cobalt carbonate-nickel carbonate-ice solid mixture and 2.8 g of liquid nitrogen into the ball milling tank (the amount of liquid nitrogen is 0.075 times the mass of the metal salt-ice solid mixture), and perform ball milling in a low-temperature planetary ball mill at a ball milling speed of 450 r / min, the ball-to-material ratio is 6:1, and the ball milling time is 72...

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Abstract

The invention discloses core-shell structure composite powder and a preparation method thereof. The preparation method specifically comprises the steps that deionized water is used for wetting insoluble metal salt, an ice coating layer is formed on the surface of the metal salt, low-temperature ball milling is conducted, nano metal salt-ice mixed powder is obtained, and wet nano metal salt is obtained after ice melts; adding wet nano metal salt, powder particles and a gelling agent into deionized water, and fully stirring and dispersing to obtain a gel suspension; carrying out solid-liquid separation on the gel suspension, and drying to obtain the nano metal salt coated on the surfaces of the powder particles; and under the reducing atmosphere, the obtained nano metal salt wrapping the surfaces of the powder particles is subjected to heating reduction treatment, the gelling agent is removed, and the composite powder of the core-shell structure is obtained. Metal salt is subjected to low-temperature brittle ball milling to form nano-particles, gel suspension is prepared with the assistance of a gelatinizing agent, powder particles coated with nano-metal salt are obtained through drying, and composite powder with highly uniform phase distribution and good dispersity is obtained through heating reduction.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and relates to a core-shell structure composite powder and a preparation method thereof. Background technique [0002] Refractory metal alloys (such as alloys based on tungsten, molybdenum, tantalum, niobium, rhenium, etc.) and hard materials (such as WC, TiC, TiN, TiCN, TaC, NbC, Mo 2 C. TiB 2 , B 4 C, etc. are hard alloys or ceramic materials) are usually prepared by powder metallurgy. The main preparation process includes: mixing the refractory metal matrix with additive elements (such as Co, Cu, Ti, etc.), the hard phase and the binder metal (such as Mn, Fe, Co, Ni, Cu, etc.) by ball milling to obtain a powder mixture ; Further pressing and sintering to obtain refractory metal alloys (such as W-Cu, Mo-Ti-Zr alloys), hard materials (such as WC-Co cemented carbide, TiB 2 -Fe / Co / Ni cermet). It is well known that the physical and mechanical properties of materials are determined...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/18B22F1/17B22F9/22B22F9/04B22F1/07B82Y30/00
CPCB22F9/22B22F9/04B82Y30/00B22F2009/043
Inventor 何人桂邱玉珍欧平花张小联杨海林杨初斌韩宝军
Owner GANNAN NORMAL UNIV
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