A kind of vacuum carbon reduction prepares the method for metal hafnium powder

A hafnium powder and vacuum technology is applied in the field of reducing hafnium dioxide by graphite powder to prepare metal hafnium powder, which can solve the problems of high metal impurity content and low purity, and achieve high metal yield, simple production process and significant economic benefits. Effect

Inactive Publication Date: 2017-06-06
湖南华威景程材料科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to obtain the hafnium powder prepared by vacuum carbothermal reduction of graphite powder to hafnium dioxide, which overcomes the problems of low purity and high content of metal impurities in the prior art

Method used

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Effect test

Embodiment 2

[0033] Step 1, mixing materials: using hafnium dioxide as raw material and graphite as reducing agent, in order to prevent the produced products from being affected by carbon, the principle of multi-oxygen decarbonization is adopted in the batching, and the hafnium dioxide added exceeds the stoichiometric 5 %, add 5% absolute alcohol, mix in a mixer for 50 hours, dry the alcohol, and press it into a billet on a press;

[0034] Step 2, two-stage carbon reduction: put the pressed material into a vacuum carbon reduction furnace, heat up to 1650°C for the first stage of reduction, keep the temperature until the vacuum is 20 Pa, then raise the temperature to 1850°C, and keep the vacuum at 1 After that, power off and cool down to room temperature naturally; a section of the reduced material is taken out of the furnace and crushed to below 325 mesh, mixed evenly after 10 hours, and then pressed into a billet again;

[0035] Put it into a vacuum furnace for the second stage of reducti...

Embodiment 3

[0046] Step 1, mixing: using hafnium dioxide as the raw material and graphite as the reducing agent, in order to prevent the produced product from being affected by carbon, the principle of multi-oxygen decarbonization is adopted in the batching, and the hafnium dioxide added exceeds the stoichiometric 4 %, add 5% absolute alcohol, mix in a mixer for 80 hours, dry the alcohol, and press it into a billet on a press;

[0047] Step 2, two-stage carbon reduction: put the pressed material into a vacuum carbon reduction furnace, heat up to 1600°C in the first stage of reduction, keep the temperature until the vacuum is 40 Pa, then raise the temperature to 1800°C, and keep the vacuum at 15 After that, power off and cool down to room temperature naturally; a section of the reduced material is taken out of the furnace and crushed to below 325 mesh, mixed evenly after 8 hours, and pressed into a billet again;

[0048] Put it into a vacuum furnace for the second stage of reduction, raise...

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Abstract

The invention belongs to the technical field of vacuum metallurgy, discloses a method for preparing high-purity metal hafnium powder through hafnium dioxide vacuum carbon thermal reduction, and in particular, provides a method for preparing metal hafnium powder through reducing hafnium dioxide by graphite powder in vacuum. The method has the advantages of simple production process, low equipment investment, high metal yield of 95-98%, low production cost and prominent economic benefit, and is a process with low cost and high yield and suitable for large-scale preparation of high-purity and fine-granularity metal hafnium powder.

Description

technical field [0001] The invention belongs to the technical field of vacuum metallurgy, in particular to a method for preparing high-purity metal hafnium powder by vacuum carbothermal reduction of hafnium dioxide, and in particular provides a method for preparing metal hafnium powder by reducing hafnium dioxide with graphite powder in vacuum Methods. Background technique [0002] Hafnium is a high-melting refractory metal with an atomic weight of 178.49 and a melting point of 2222 (±30°C). Metal hafnium has excellent processing properties and can be forged and drawn. But the most important thing is the nuclear performance of hafnium, which has an excellent thermal neutron capture cross section and can be used as a control material for nuclear reactors. Metal hafnium has excellent corrosion resistance in air, and its reaction with gas is similar to that of zirconium, and it is compatible with oxygen, Nitrogen reacts at a lower rate than zirconium. The corrosion resistance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/20B22F1/00
Inventor 彭志明
Owner 湖南华威景程材料科技有限公司
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