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Preparation method for superfine zirconium powder

A zirconium powder and powder technology is applied in the field of preparation of ultra-fine zirconium powder, which can solve the problems that ultra-fine zirconium powder is prone to spontaneous combustion and self-explosion, restricts ultra-fine zirconium powder, safety accidents, etc., so as to eliminate the risk of spontaneous combustion and self-explosion and reduce surface activity. , the effect of inhibiting growth behavior

Inactive Publication Date: 2015-01-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the agglomeration, sintering and growth of powder during high temperature dehydrogenation restrict the preparation of ultrafine zirconium powder, which greatly limits its application in modern industry.
Not only that, when the existing hydrodehydrogenation method prepares ultra-fine zirconium powder, due to the characteristics of ultra-fine zirconium powder that is extremely prone to spontaneous combustion and self-explosion, it may cause serious safety accidents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Step 1 Sponge zirconium hydropermeation:

[0046] The material of the grinding balls used in this embodiment is cemented carbide balls.

[0047]Take 2kg of sponge zirconium whose composition requirements meet the industry standard of YS / T397~2007, and mechanically crush it to a particle size of less than 3mm, and place it in a vacuum furnace. The stages are kept warm for 1 hour each, and at the end of the heat preservation, high-purity hydrogen gas permeates for 2 hours at a constant temperature of 650°C;

[0048] Step 2 mechanically crushing zirconium hydride particles:

[0049] Divide the zirconium hydride particles obtained in the first step into 4 groups of 500g each, numbered 1#, 2#, 3#, 4#, and add 50g sodium chloride, 50g potassium chloride, 62.5g sodium sulfate, 62.5 g Potassium sulfate is subjected to high-energy ball milling in anhydrous ethanol medium, the grinding balls are cemented carbide balls, the mass ratio of grinding balls to zirconium hydride is 8:...

Embodiment 2

[0060] The material of the grinding balls used in this embodiment is cemented carbide balls.

[0061] Step 1 Sponge zirconium hydropermeation:

[0062] Take 2kg of sponge zirconium whose composition requirements meet the industry standard of YS / T397~2007, and mechanically crush it to a particle size of less than 3mm, and place it in a vacuum furnace. The stages are kept warm for 1 hour each, and at the end of the heat preservation, high-purity hydrogen gas permeates for 2 hours at a constant temperature of 650°C;

[0063] Step 2 mechanically crushing zirconium hydride particles:

[0064] Add 200g of sodium chloride to the zirconium hydride particles obtained in the first step and carry out high-energy ball milling in anhydrous ethanol medium. The mass ratio of balls to zirconium hydride is 8:1, the ball milling speed is 40r / min, and the liquid level of the ball milling medium is high Take 2 cm of zirconium hydride powder, and after ball milling for 2 hours, vacuum-dry at a v...

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Abstract

The invention relates to a preparation method for superfine zirconium powder, in particular to a technical method utilizing a sodium salt and / or potassium salt to coat zirconium hydride to prepare micro-nano-scale zirconium powder, and belongs to the technical field of superfine metal powder. The technical method comprises the following steps: taking the sodium salt as a coating agent, mixing the zirconium hydride particles with the coating agent according to a mass ratio of (5-15):1, conducting wet grinding and vacuum drying to obtain the superfine zirconium powder of which surface is coated with the coating agent uniformly, dehydrogenizing in a vacuum environment at 550-680 DEG C, and conducting wet grinding dispersion and elution on the product to remove the coating agent so as to obtain the superfine zirconium powder, wherein the vacuum degree is controlled at 0.05-0.1 Pa in the dehydrogenation process. The preparation method disclosed by the invention is simple in preparation technology, convenient to control, and safe in operation technology; the obtained product is good in quality; the preparation method facilitates industrialized application.

Description

technical field [0001] The invention relates to a preparation method of ultrafine zirconium powder, in particular to a technical method for preparing micronano zirconium powder by coating zirconium hydride with sodium salt and / or potassium salt, and belongs to the technical field of ultrafine metal powder preparation. Background technique [0002] Metal zirconium powder has a wide range of uses, and can be used as coating materials or getters for electric vacuum devices, initiating materials, fuses, pyrotechnics, and flares for various ammunition in the military industry, and packaging for fuel uranium in the nuclear industry and Other structural materials of the reactor core, etc. In addition, because zirconium has good corrosion resistance and high melting point, zirconium powder can be used as an alloy additive to prepare high-quality anti-corrosion metal coating materials or acid and alkali resistant filter materials. The extensive demand for zirconium powder in modern ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F1/02B22F9/30
Inventor 康建刚吝楠贺跃辉
Owner CENT SOUTH UNIV
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