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Manufacturing method of high-density pure-rhenium test tube

A manufacturing method and high-density technology, applied in metal processing equipment, transportation and packaging, etc., can solve the problems of difficult to use cold isostatic pressing, scarce rhenium resources, poor fluidity, etc., to improve material utilization, improve charging Uniformity, the effect of reducing manufacturing cost

Active Publication Date: 2017-01-04
中铼新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Rhenium belongs to a close-packed hexagonal structure. Conventional rhenium powder has a dendritic shape, poor fluidity, and poor press-forming performance, which makes it difficult to adopt cold isostatic pressing used in conventional powder metallurgy processes.
Because rhenium has a particularly high work-hardening rate, and rhenium resources are relatively scarce and expensive, it is expensive and inefficient to manufacture rhenium test tubes by machining rods
Moreover, machining deep holes is also a difficult problem, so that the length-to-diameter ratio of the test tube cannot be too large
When the hollow tube is prepared by the ordinary powder metallurgy process, problems such as compact breakage are prone to occur. For rhenium products, this phenomenon is more serious. Ordinary processes cannot prepare rhenium compacts with long aspect ratios.
Due to the large aspect ratio, it is also prone to bending deformation during the sintering process.

Method used

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  • Manufacturing method of high-density pure-rhenium test tube

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Embodiment 1 A kind of manufacture method of high-density rhenium test tube

[0036] Including the following steps:

[0037] 1) Plasma spheroidization: choose rhenium powder with a purity of 99.99% and a Fischer particle size of 3 μm, and carry out radio frequency plasma spheroidization on the rhenium powder. The main process parameters of the spheroidization are: input power 55KW, argon working gas flow rate 35slpm , the argon shielding gas flow rate is 75slpm, the system pressure is 1500Pa, the powder feeding rate is 30g / min, the Fischer particle size after spheroidization is 5.5μm, and the oxygen content is 0.048wt%;

[0038] 2) Aging treatment: aging treatment is carried out on the spheroidized rhenium powder under the condition of vacuum protection, the aging temperature is 800 ℃, after 4 hours of heat preservation, it is cooled with the furnace, and the vacuum degree at high temperature is not lower than 1×10 -2 Pa;

[0039] 3) sieving treatment; use 300 mesh si...

Embodiment 2

[0047] Embodiment 2 A kind of manufacture method of high-density rhenium test tube

[0048] Including the following steps:

[0049] 1) Plasma spheroidization: choose rhenium powder with a purity of 99.99% and a Fischer particle size of 8 μm, and carry out radio frequency plasma spheroidization on the rhenium powder. The main process parameters of the spheroidization are: input power 75KW, argon gas flow rate 55slpm , the argon shielding gas flow rate is 85slpm, the system pressure is 1500Pa, the powder feeding rate is 15g / min, the Fischer particle size after spheroidization is 12μm, and the oxygen content is 0.046wt%;

[0050] 2) Aging treatment: aging treatment is carried out on the spheroidized rhenium powder under the condition of vacuum protection, the aging temperature is 800 ℃, after 4 hours of heat preservation, it is cooled with the furnace, and the vacuum degree at high temperature is not lower than 1×10 -2 Pa;

[0051] 3) sieving treatment; the rhenium powder after...

Embodiment 3

[0058] Embodiment 3 A kind of manufacturing method of high-density rhenium test tube

[0059] Including the following steps:

[0060] 1) Plasma spheroidization: choose rhenium powder with a purity of 99.99% and a Fischer particle size of 5 μm, and perform radio frequency plasma spheroidization on the rhenium powder. The main process parameters of the spheroidization are: input power 65KW, argon gas flow rate 45slpm , the flow rate of argon shielding gas is 65slpm, the system pressure is 1500Pa, the powder feeding rate is 20g / min, the Fischer particle size after spheroidization is 8μm, and the oxygen content is 0.045wt%;

[0061] 2) Aging treatment: aging treatment is carried out on the spheroidized rhenium powder under the condition of vacuum protection, the aging temperature is 800 ℃, after 4 hours of heat preservation, it is cooled with the furnace, and the vacuum degree at high temperature is not lower than 1*10 -2 Pa;

[0062] 3) sieving treatment; the rhenium powder aft...

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Abstract

The invention discloses a manufacturing method of a high-density pure-rhenium test tube. The manufacturing method comprises the following steps: 1) preparing raw materials, that is, carrying out radio-frequency plasma spheroidization on high-purity rhenium powder; preparing high-purity spherical rhenium powder or high-purity sphere-like rhenium powder of which the spheroidization rate is not less than 80% and the average particle size is 5 to 35 mum; 2) carrying out aging treatment on the rhenium powder, that is, carrying out the aging treatment on the rhenium powder subjected to the spheroidization in a protective atmosphere II; 3) forming, that is, putting the rhenium powder which is subjected to the aging treatment into an elastic die sleeve; using cold isostatic pressing techniques to carry out pressing to form and manufacture a test tube green compact; 4) sintering, that is, placing the formed test tube green compact in a high-temperature sintering furnace, and sintering in a protective atmosphere IV; 5) machining to manufacture a test tube finished product. Finally, the high-density pure-rhenium test tube of which the density is greater than 20.2g / cm<3> (the theoretical density is 96%) and the ratio of the length to the outer diameter is greater than 15 is manufactured.

Description

technical field [0001] The invention belongs to the field of powder metallurgy preparation, in particular to a method for manufacturing a high-density pure rhenium test tube. Background technique [0002] Metal rhenium has the characteristics of high density, high melting point, excellent high-temperature strength and high-temperature plasticity, etc., and is used as a base material to make various high-temperature structural parts, high-temperature heaters, special-shaped parts, etc., and is widely used in aviation, aerospace, atomic energy, ultra-high temperature alloys , semiconductor vacuum coating, high temperature thermal field and other cutting-edge fields. Rhenium test tubes are mainly used in high-temperature environments, such as scientific experiments, evaporation and other processes, and it is necessary to use rhenium test tubes to carry samples and materials. [0003] Rhenium belongs to a close-packed hexagonal structure, and the conventional rhenium powder has...

Claims

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Application Information

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IPC IPC(8): B22F5/12B22F1/00B22F3/04B22F3/10
CPCB22F3/04B22F3/1007B22F5/106B22F2998/10B22F1/14B22F1/142
Inventor 扶元初杨海兵
Owner 中铼新材料有限公司
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