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Rhenium crucible, preparation method thereof and mould for preparing rhenium crucible

A crucible and mold technology, applied in the field of rare metal materials, can solve the problems of low utilization rate of metal powder, high requirements for auxiliary equipment, large cold working hardening rate, etc., to achieve convenient installation and demoulding, good molding effect, and reduce processing. effect of margin

Inactive Publication Date: 2016-12-14
ULTRA MINOR METALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For rhenium, its cold work hardening rate is very high, which is the highest among metals. It is hardened during processing, requires multiple annealing treatments, has high deformation resistance, and requires high processing equipment. It will form rhenium heptoxide with a low melting point, so the thermal deformation treatment of rhenium must be carried out in hydrogen or vacuum environment, which requires high auxiliary equipment. Therefore, the traditional spinning method is not suitable for the processing of rhenium
The spray deposition method does not have a high utilization rate for metal powder, and requires gas protection during the entire forming process. For expensive metals such as rhenium, the cost is too high and it is not suitable.

Method used

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  • Rhenium crucible, preparation method thereof and mould for preparing rhenium crucible
  • Rhenium crucible, preparation method thereof and mould for preparing rhenium crucible

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preparation example Construction

[0018] The present invention provides a method for preparing a rhenium crucible, which includes the following steps:

[0019] Mixing step: Mix rhenium powder and binder uniformly to make feed.

[0020] Further, in a preferred embodiment of the present invention, the binder is prepared by mixing wax, high molecular polymer, surfactant and plasticizer at 150-170°C for 1 to 3 hours. The mixing temperature is 5~25℃ higher than the melting temperature of the system, and mixing and stirring until the binder is in the form of a slurry and the color is uniform.

[0021] Specifically, in terms of parts by mass, the binder includes 60 to 75 parts of wax, 20 to 30 parts of high molecular polymer, 0.5 to 1.5 parts of surfactant, and 1 to 5 parts of plasticizer.

[0022] Further, in a preferred embodiment of the present invention, the wax is any one of paraffin wax, ozokerite wax and beeswax after slicing. The melting temperature of wax is low and the viscosity decreases rapidly with the increase...

Embodiment 1

[0045] This embodiment provides a method for preparing a rhenium crucible, including the following steps:

[0046] Mixing steps:

[0047] In parts by weight, 60 parts of paraffin wax, 25 parts of high-density polyethylene, 1 part of oleic acid and 5 parts of dioctyl phthalate are selected and added to the vacuum mixer and mixed at 170°C for 3 hours until The obtained binder is paste-like with uniform color. Then, 91 parts by weight of rhenium powder was added to the binder, and the mixing was continued for 4 hours. After the mixing, the mixture was cooled to room temperature to obtain the required feed.

[0048] Injection molding steps:

[0049] Use a vertical injection machine to inject the above feed into the mold 100 at 150°C, such as figure 1 As shown, the mold 100 includes a core mold 110 and a female mold 120. The base 130 is sleeved on the bottom of the core mold 110. The core mold 110, the female mold 120 and the base 130 together form a cavity 140 that is consistent with the...

Embodiment 2

[0057] This embodiment provides a method for preparing a rhenium crucible, including the following steps:

[0058] Mixing steps:

[0059] In parts by weight, 67 parts of ozokerite wax, 20 parts of ethylene-vinyl acetate copolymer, 1.5 parts of oleic acid and 3 parts of dibutyl phthalate are selected and added to the vacuum mixer and mixed at 150°C 1h, until the obtained binder becomes paste and the color is uniform. Then, 75 parts by weight of rhenium powder is added to the binder, and the mixing is continued for 2 hours. After the mixing is completed, it is cooled to room temperature to obtain the required feed.

[0060] Injection molding steps:

[0061] A vertical injection machine is used to inject the above-mentioned feed into a specific mold 100 at 140°C. After the mold is cooled to room temperature, the desired injection blank can be obtained by demolding.

[0062] Degreasing steps:

[0063] A thin-walled molybdenum part with multi-mesh holes is inserted into the injection blank ...

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Abstract

The invention discloses a rhenium crucible, a preparation method thereof and a mould for preparing the rhenium crucible and belongs to the field of metal materials. The preparation method comprises the following steps of uniformly mixing rhenium powder and a binder to prepare a feed; carrying out injection moulding on the feed to obtain an injection blank; and degreasing and sintering the injection blank to obtain the rhenium crucible. The preparation method is simple in operation, stable in process, high in moulding speed and high in material utilization ratio. The invention also relates to the rhenium crucible prepared by using the method. The rhenium crucible is good in moulding effect, regular in shape, uniform in texture, smooth in surface, very high in strength and durable in use. The invention also relates to the mould for preparing the rhenium crucible, the shape of the mould can be regulated according to the specific demand of the rhenium crucible, the inner cavity of the mould is smooth and clean to ensure that the surface of the crucible is uniform, and the mould is very convenient to mount and demould due to the adoption of a combined structure.

Description

Technical field [0001] The invention relates to the field of rare metal materials, in particular to a rhenium crucible, a preparation method thereof, and a mold for preparing the rhenium crucible. Background technique [0002] Rhenium has stable chemical properties and strong corrosion resistance. It is not oxidized in the air. Acid and alkali have little corrosive effect on it. In addition, rhenium has excellent thermal vibration resistance and excellent creep resistance. Under large thermal expansion, no mechanical damage occurs, and it is suitable for high-temperature heating materials and high-temperature corrosion-resistant materials. [0003] Traditional rare metal processing methods include spinning and spray deposition. For rhenium, its cold work hardening rate is very large, which is the highest among metals. It hardens during processing and requires multiple annealing treatments. It has high deformation resistance and requires high processing equipment. However, when rhe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F3/22B22F3/03
CPCB22F3/03B22F3/225
Inventor 秦寒梅佘直昌
Owner ULTRA MINOR METALS
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