Mechanical alloyed method for manufacturing CrW alloy powder

A technology of mechanical alloying and alloy powder, applied in the field of mechanical alloying to manufacture CrW alloy powder, to achieve the effect of high solid solubility

Inactive Publication Date: 2008-02-20
XIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, there is no specific method for preparing CrW alloy powder

Method used

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  • Mechanical alloyed method for manufacturing CrW alloy powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] After mixing 91% tungsten powder and 9% chromium powder, put it into a horizontal nylon ball mill; add anhydrous ethanol according to 2% of the total mass of tungsten powder and chromium powder in the ball mill, and press tungsten powder and chromium powder into the ball mill. Add cemented carbide grinding balls to 50 times the total mass; use nitrogen to remove the air in the ball mill tank, seal the ball mill tank, open the circulating cooling water in the ball mill tank, and ball mill for 100 hours; after the ball mill is over, let it stand for cooling and take out the powder material. The morphology of the alloy powder and its X-ray diffraction (XRD) analysis results are shown in Figure 1. It can be seen from the figure that the morphology of the original powder particles has changed a lot, and the particle shape has become an irregular flat shape, and the particles are finely dispersed. From the diffraction analysis results, it is known that chromium has been comp...

Embodiment 2

[0027] After mixing 80% of tungsten powder and 20% of chromium powder, put it into a horizontal nylon ball mill; in the ball mill, add analytical pure acetone according to 4% of the total mass of the powder, and add stainless steel according to 80 times of the total mass of the powder. Grinding balls, the diameters of different grinding balls are arranged at 1:1; use argon to remove the air in the ball mill tank, and seal the ball mill tank; open the circulating cooling water of the ball mill tank, and ball mill for 80 hours; after the ball mill, let stand for cooling Then remove the powder. The morphology of the alloy powder and its XRD analysis results are shown in Figure 2. It can be seen from the figure that the morphology of the original powder particles has changed a lot, and the particle shape has become an irregular flat shape, and the particles are finely dispersed. From the diffraction analysis results, it is known that chromium has been completely dissolved into tu...

Embodiment 3

[0029] After mixing 87.5% of tungsten powder and 12.5% ​​of chromium powder, put it into a vertical stainless steel ball mill; add absolute ethanol according to 5% of the total mass of the powder, and add it according to 100 times of the total mass of the powder. Agate grinding ball, the diameter of different grinding balls is 1:1; slowly vacuumize the ball mill to 10 -1 Pa, open the cooling water of the ball mill tank, and mill the ball for 60 hours; after the ball mill is over, let it stand for cooling and take out the powder. The morphology of the alloy powder and its XRD analysis results are shown in Figure 3. It can be seen from the figure that the morphology of the original powder particles has changed a lot, and the particle shape has become an irregular flat shape, and the particles are finely dispersed. From the diffraction analysis results, it is known that chromium has been completely dissolved into tungsten to form tungsten-chromium alloy powder.

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Abstract

The present invention discloses a mechanical alloying method for producing CrW alloy powders. The method includes the following steps: first, chromium powders with tungsten powders are blent at a certain proportion, and then 2 to 5 percent of process control agents and grinding balls 50 to 100 times heavier than the blended powders are added into the powders ; and finally the mixtures are put into an atmosphere-protection pot or a vacuum ball-grinding jar in a ball grinder and are grinded for 50 to 100 hours until the mixtures become solid solutions; after grinding, the ball stuff is put in static condition for a while until the ball stuff cool down fully, and then the powders are taken out. Thus, the CrW alloy powders formed by the method have tiny particles and even components, high degrees of solidification and dissolution, easy dissipation, and simple processing and easy operation.

Description

technical field [0001] The invention belongs to the technical field of material preparation, and particularly relates to a method for producing CrW alloy powder by mechanical alloying. Background technique [0002] CrW solid solution alloy powder can be used in powder metallurgy industry. Especially in the manufacture of contact materials, it is used to replace W powder or Cr powder to prepare CuWCr composite materials. [0003] Since the solid solubility of chromium in tungsten is very low at room temperature, its solid solubility increases significantly with the increase of temperature. Usually, the preparation of tungsten-chromium alloys is carried out at high temperatures close to the melting point of chromium. The melting points of these two metals are very high, and it is very difficult to fully alloy under the existing equipment conditions. On the other hand, in the process of high-temperature alloying of powders, the powders will stick to each other and cannot be d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/04
Inventor 肖鹏范志康梁淑华
Owner XIAN UNIV OF TECH
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