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Composite powder for high gravity alloy and preparation method thereof

A composite powder, high specific gravity technology, applied in coatings, jewelry, etc., can solve the problems of difficult large-scale production, poor composition uniformity, impurity reduction performance, etc., and achieve the effect of easy operation, improved mechanical properties, and uniform composition distribution

Active Publication Date: 2015-10-28
UNIV OF SCI & TECH BEIJING
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  • Application Information

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Problems solved by technology

[0006] In order to solve the above-mentioned problems in the process of preparing composite powders for high specific gravity alloys, the introduction of impurities in the preparation process reduces performance, poor composition uniformity, complicated process, cumbersome steps, high preparation cost, and difficulty in large-scale production. Composite powder for high specific gravity alloy and preparation method thereof

Method used

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  • Composite powder for high gravity alloy and preparation method thereof
  • Composite powder for high gravity alloy and preparation method thereof
  • Composite powder for high gravity alloy and preparation method thereof

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preparation example Construction

[0064] A method for preparing composite powder for high specific gravity alloys, the method comprising the following steps:

[0065] (1) Degrease and pickle the tungsten powder, place the tungsten powder in an alkaline solution at 20-80°C for ultrasonic treatment for 10-60 min, then remove the upper layer solution and wash it with deionized water until it is neutral. The final powder was placed in an acidic solution at 20-80 °C for 10-60 min, then the upper solution was removed, washed with deionized water until neutral, and dried in vacuum for later use.

[0066] The particle size of the tungsten powder is 0.5-15 μm.

[0067] The tungsten powder is in irregular shape and / or spherical shape, such as irregular shape, spherical shape or a combination of irregular shape and spherical shape.

[0068] The components and concentrations thereof included in the alkaline solution in the degreasing process of the tungsten powder are as follows:

[0069] Sodium hydroxide 50~100 g / L

...

Embodiment 1

[0099] Example 1: Composite powder for nickel-iron alloy electroplating solution for intermittent electroplating of high specific gravity alloys

[0100] (1) Irregularly shaped tungsten powder with an average particle size of 4-6 μm ( figure 1 and figure 2 ) in an alkaline solution (degreasing solution) at 50°C for 30 minutes, and the alkaline solution includes: sodium hydroxide 100 g / L, sodium carbonate 10 g / L, trisodium phosphate 20 g / L, twelve Sodium alkyl sulfonate 1 g / L, then remove the upper layer solution, and wash it with deionized water to neutrality, then place it in an acidic solution at 20 °C for 30 min, wherein the acidic solution includes concentrated sulfuric acid 100 g / L, Then remove the upper layer solution and wash the tungsten powder to neutrality, and dry it in vacuum for later use. (2) Add the tungsten powder treated in step (1) into the iron-nickel alloy electroplating solution, wherein the dosage of tungsten powder is 13 g / L, and the plating solution ...

Embodiment 2

[0101] Example 2: Composite powder for nickel-iron alloy electroplating solution for intermittent electroplating of high specific gravity alloys

[0102] (1) Put spherical tungsten powder with an average particle size of 4-6 μm in an alkaline solution (degreasing solution) at 80°C for 60 minutes, wherein the alkaline solution includes: sodium hydroxide 100 g / L, carbonic acid Sodium 50 g / L, trisodium phosphate 60 g / L, sodium dodecylsulfonate 5 g / L, then remove the upper layer solution, and wash it with deionized water until neutral, then put it in an acidic solution at 80°C Sonicate for 60 min, in which the acidic solution includes concentrated sulfuric acid 200 g / L, then remove the upper layer solution and wash the tungsten powder to neutrality, and vacuum dry it for later use. (2) Add the tungsten powder treated in step (1) into the nickel-iron alloy electroplating solution, wherein the dosage of tungsten powder is 12 g / L, and the plating solution includes: nickel sulfate...

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Abstract

The invention discloses composite powder for a high gravity alloy and a preparation method thereof. The composite powder particle for the high gravity alloy has an irregular or spherical shape; the composite powder has a core-shell structure, the inner core is tungsten whose grain sizes are uniformly distributed, the shell is a nickel-based alloy with a uniform thickness, and the mass ratio is 85-97 to 15-3; and the composite powder has the advantages of uniform composition and high purity and the like. The preparation method comprises steps: oil removing and acid cleaning are carried out on tungsten powder; intermittent plating technology is then adopted for enabling the nickel-based alloy to be uniformly deposited on the surface of the tungsten powder; and the composite powder after being plated is cleaned and dried. The intermittent plating technology is adopted to prepare the composite powder for the high gravity alloy, the method is simple, reliable and easy to operate, the electroplating speed, the plating layer thickness, and the composition content range can be effectively adjusted, the mechanical performance of the high gravity alloy can be effectively improved, the application prospect is wide, and mass industrialized production can be realized.

Description

technical field [0001] The invention belongs to the technical field of materials and electroplating, and in particular relates to a composite powder for high specific gravity alloys and a preparation method thereof. Background technique [0002] High specific gravity alloy is a kind of alloy composed of W as the matrix phase (W content 85~97%, wt.%), Ni, Fe, Cu, Co, etc. as the binder phase, with high density, high strength, high ductility, High elastic modulus and excellent corrosion resistance, oxidation resistance and impact toughness, low thermal expansion coefficient and other characteristics. Therefore, it is widely used in industries such as aerospace, national defense and military industry, and civil industry. [0003] With the development of modern science and technology, the mechanical properties of high specific gravity alloys have been continuously improved and perfected. In addition to the influence of alloy material and sintering treatment on properties,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02C25D3/12C25D7/00C25D5/38
Inventor 周张健吴鹏李建强刘鹏杰
Owner UNIV OF SCI & TECH BEIJING
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