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Preparation method of pure rhenium product

A technology of pure rhenium products, which is applied in the field of preparation of pure rhenium products, can solve problems such as difficulties in production and processing, and achieve the effects of large size, novel technical ideas, and simple process operation

Active Publication Date: 2018-06-15
ATTL (BEIJING) ADVANCED MATERIALS CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The existing technologies and published patents are all technical solutions for the preparation of smaller rhenium sheets, rhenium foils or rhenium test tubes. For larger pure rhenium products, due to the particularly difficult production and processing, there is still a blank

Method used

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  • Preparation method of pure rhenium product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1) rhenium powder pretreatment: take 20Kg pure rhenium powder, add 4% paraffin wax (that is, the addition of paraffin wax is 4% of rhenium powder quality) by mass percentage as binding agent, and mix homogeneously, the rhenium powder of described The particle size is -325 mesh;

[0035] 2) Press molding: put the wax-mixed powder into a cylindrical mold, and carry out cold isostatic pressing molding, the pressing pressure is 200MPa, the holding time is 20s, and a green compact with a relative density of 62% is obtained;

[0036] 3) Dewaxing: use a dewaxing furnace to dewax the compact, the dewaxing temperature is 900°C, and the holding time is 4h;

[0037] 4) Pre-sintering: pre-sintering the blank obtained in step 3) under vacuum conditions, the pre-sintering temperature is 1200°C, the holding time is 2h, and the vacuum degree is 10 -2 Pa, to obtain pre-sintered compact;

[0038] 5) Covering: using titanium plate as the covering material to cover the pre-sintered bille...

Embodiment 2

[0045] 1) rhenium powder pretreatment: take 24Kg pure rhenium powder, add 5% paraffin (that is, the addition of paraffin wax is 5% of the quality of rhenium powder) by mass percentage as a binder, and mix uniformly, the rhenium powder The particle size is -250 mesh;

[0046] 2) Press molding: put the wax-mixed powder into a square mold, carry out cold isostatic press molding, the pressing pressure is 150MPa, and the holding time is 30s to obtain a compact with a relative density of 65%;

[0047] 3) Dewaxing: use a dewaxing furnace to dewax the compact, the dewaxing temperature is 1000°C, and the holding time is 3h;

[0048] 4) Pre-sintering: pre-sintering the blank obtained in step 3) under vacuum conditions, the pre-sintering temperature is 1300°C, the holding time is 3h, and the vacuum degree is 10 -2 Pa, to obtain pre-sintered compact;

[0049] 5) Covering: use molybdenum-rhenium plate as the covering material to cover the pre-sintered billet and vacuumize it;

[0050] 6...

Embodiment 3

[0055] 1) rhenium powder pretreatment: take 40Kg pure rhenium powder, add 2% paraffin wax (that is, the addition of paraffin wax is 2% of rhenium powder quality) by mass percentage as binder, and mix uniformly, the rhenium powder The particle size is -150 mesh;

[0056] 2) Press molding: put the wax-mixed powder into a square mold, carry out cold isostatic press molding, the pressing pressure is 240MPa, the holding time is 30s, and the green compact with a relative density of 68% is obtained;

[0057] 3) Dewaxing: use a dewaxing furnace to dewax the compact, with a dewaxing temperature of 730°C and a holding time of 4 hours;

[0058] 4) Pre-sintering: pre-sintering the blank obtained in step 3) under vacuum conditions, the pre-sintering temperature is 1100°C, the holding time is 5h, and the vacuum degree is 10 -2 Pa, to obtain pre-sintered compact;

[0059] 5) Covering: use molybdenum-rhenium plate as the covering material to cover the pre-sintered billet and vacuumize it; ...

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Abstract

The invention discloses a preparation method of a pure rhenium product. The method comprises the processes of rhenium powder pretreating, pressing and forming, dewaxing, pre-sintering, sleeve wrapping, hot isostatic pressing, wrapped sleeve removal, high-temperature sintering process and the like. According to the preparation method of the pure rhenium product, large-size pure rhenium rods, pure rhenium blocks and other products are prepared, and the advantages of being controllable in shape and size and high in density are achieved.

Description

technical field [0001] The invention belongs to the field of rare refractory metals, and in particular relates to a preparation method of pure rhenium products. Background technique [0002] Metal rhenium is a rare refractory metal with high density, high melting point, good plasticity and creep resistance, and corrosion resistance. Rhenium and its alloys have been widely used in aerospace, electronics, petrochemical and other fields. [0003] The content of rhenium on the earth is rare and expensive, and due to the high work hardening rate of rhenium, the preparation method of pure rhenium products needs to be developed according to the needs of actual products. Patent CN200710179262.9 discloses a manufacturing method of hard-to-deform pure rhenium sheet. The method uses high-purity rhenium powder obtained through two-stage reduction, adopts an open die, undergoes high-temperature sintering, and adopts cold rolling and intermediate annealing processes to roll out a theore...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/04B22F3/10B22F3/15C22C1/04C22C27/00
CPCB22F3/04B22F3/1007B22F3/1021B22F3/15B22F2998/10C22C1/045C22C27/00
Inventor 王广达熊宁刘国辉
Owner ATTL (BEIJING) ADVANCED MATERIALS CO LTD
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