Spherical rhenium alloy powder as well as preparation method and application thereof

A rhenium alloy and powder technology, which is applied in the field of spherical rhenium alloy powder and its preparation, can solve the problems of unfavorable alloy processing and use, segregation of ammonium rhenate and ammonium paratungstate, etc., and achieve improved market utilization, good fluidity, and convenient operation Effect

Active Publication Date: 2016-04-20
株洲铼因材料技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Second, if the rhenium content in the tungsten-rhenium pre-alloyed powder is unevenly distributed, especially when the rhenium content reaches 25%, the rhenium-rich region in the alloy will form a high-strength and high-hardness σ phase (W 2 Re 3 ),

Method used

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  • Spherical rhenium alloy powder as well as preparation method and application thereof
  • Spherical rhenium alloy powder as well as preparation method and application thereof
  • Spherical rhenium alloy powder as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation method of spherical rhenium alloy powder is as follows:

[0030] 1) Mix the ammonium paratungstate solution containing 20wt% tungsten with the ammonium rhenate solution containing 5wt% rhenium according to the weight of 36:1, and keep stirring;

[0031] 2) The mixed liquid is pumped to the centrifugal atomizer at the top of the spray drying tower by pumping 260g / min. The rotational speed of the centrifugal atomizer is 15000rad / min. The misty mixed liquid contacts with the hot air at 250°C in the tower and rapidly evaporates and crystallizes. The final mixed powder of ammonium paratungstate and ammonium rhenate falls into the collection tank at the bottom of the tower due to gravity, and a small part of the powder is pumped to the cyclone separation equipment for collection along with the induced draft equipment;

[0032] 3) The crystalline powder of ammonium paratungstate and ammonium rhenate is reduced once. The specific reduction process is as follows:...

Embodiment 2

[0036] 1) Mix the ammonium paratungstate solution containing 10wt% tungsten with the ammonium rhenate solution containing 8wt% rhenium according to the weight of 6:5, and keep stirring;

[0037] 2) Pump the mixed liquid at 100g / min to the centrifugal atomizer at the top of the spray drying tower. The rotational speed of the centrifugal atomizer is 18000rad / min. The misty mixed liquid contacts with the hot air at 320°C in the tower and rapidly evaporates and crystallizes. The final mixed powder of ammonium paratungstate and ammonium rhenate falls into the collection tank at the bottom of the tower due to gravity, and a small part of the powder is pumped to the cyclone separation equipment for collection along with the induced draft equipment;

[0038] 3) The crystalline powder of ammonium paratungstate and ammonium rhenate is reduced once. The specific reduction process is as follows: the loading capacity of the boat is 2kg, the speed of pushing the boat is 40min / boat, and the ...

Embodiment 3

[0042] 1) Mix the ammonium dimolybdate solution containing 12wt% molybdenum with the ammonium rhenate solution containing 6wt% rhenium in a weight ratio of 4:9, and keep stirring.

[0043] 2) Pump the mixed liquid at 200g / min to the centrifugal atomizer at the top of the spray drying tower. The final mixed powder of ammonium dimolybdate and ammonium rhenate falls into the collection tank at the bottom of the tower due to gravity, and a small part of the powder is pumped to the cyclone separation equipment for collection along with the induced draft equipment;

[0044] 3) The crystalline powder of ammonium dimolybdate and ammonium rhenate is reduced once. The specific reduction process is as follows: the loading capacity of the boat is 1kg, the speed of pushing the boat is 35min / boat, and the amount of hydrogen is 25m 3 / h, the reduction temperature is 920°C;

[0045] 4) Powder spheroidization: Using plasma as a heat source, molybdenum-rhenium alloy powder is fed into the cen...

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PUM

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Abstract

The invention provides a preparation method of spherical rhenium alloy powder. The preparation method comprises the following steps: (A) mixing an ammonium rhenate solution with one or more types of ammonium metallates including cerium, molybdenum and tungsten to form a mixed solution; (B) centrifuging and atomizing the mixed solution at the speed of 15000rad/min-18000rad/min to form an atomized solution, and evaporating moisture at a high temperature to obtain alloy powder; and (C) after carrying out hydrogenation reduction on the alloy powder, heating and melting by adopting plasmas and balling to obtain the spherical rhenium alloy powder. The spherical rhenium alloy powder prepared by the method provided by the invention has good mobility and high component uniformity; after being detected by an instrument, the spherical rhenium alloy powder has high sphericity degree and high intensity, and excellent performances in all aspects; and the spherical rhenium alloy powder is widely applied to the aspects of steel die pressing, isostatic pressing, hot spraying, injection molding, 3D (Three Dimensional) printing and the like, particularly 3D printing.

Description

technical field [0001] The invention relates to the field of alloy powder preparation, in particular to a spherical rhenium alloy powder and its preparation method and application. Background technique [0002] Rhenium alloy is a kind of alloy with tungsten, molybdenum and cerium as the main elements, containing 3-26wt% rhenium (tungsten-rhenium alloy) or 2-50wt% rhenium (molybdenum-rhenium alloy). The melting point of rhenium is second only to tungsten, its high temperature performance is better than that of pure tungsten, and it has excellent toughness. When rhenium is added to pure tungsten, the recrystallization temperature of tungsten can be increased by 300-500°C, and tungsten-rhenium alloy can be used at high temperature to recrystallize without becoming brittle. In addition, it can reduce the plastic-brittle transition temperature of tungsten, which is beneficial to the mechanical processing of tungsten. Tungsten-rhenium alloy not only has the original performance ...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F9/08B22F9/22
CPCB22F9/08B22F9/22B22F1/065
Inventor 秦寒梅佘直昌
Owner 株洲铼因材料技术有限公司
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